Technical Compendium: Section 7 - Brandywine Flood Study by Brandywine Conservancy & Museum of Art

Section 7 Municipal Engagement and Assessment Reports

The Brandywine Flood Study engaged thirty-eight municipalities across the Brandywine watershed to contribute flood inventory information. The Flood Study partners met with municipal staff from multiple departments, including executives, elected and appointed officials, directors of public works, directors of emergency services, and contracted engineers, among others.

Conducted from September 2023 through April 2024, municipal outreach meetings included a set of guiding questions regarding specific impacts and locations of flooding for individual and recurrent flood events. In addition, the project team reviewed municipal separate storm sewer system (MS4) permits, projects within the County Hazard Mitigation Plans, and emergency communication systems and preparedness plans with each municipality.

The municipal inventory and assessment incorporates the Flood Study’s build-out analysis that models possible future land-uses within each municipality, primarily identifying development and open space preservation. At the municipal level, the build-out analysis can be a useful tool to consider the impacts of stormwater management and flood mitigation of potential land development to accommodate the predicted future population growth within the watershed.

The culmination of the municipal outreach and recommendations for flood mitigation are reflected in the following Municipal Flood Inventory and Assessment Reports.

The first page of each Municipal Flood Inventory and Assessment:

• Municipal Summary: Includes Landscapes3 designations (for municipalities in Chester County), location, and watershed features.

• Open Space Inventory: A pie chart displays the percentage of developed, undeveloped, and protected land within the municipal boundaries, and notes if there is dedicated municipal funding for the purpose of open space preservation. County- and state-allocated open space funding programs are not reflected here.

• Build-Out Analysis: A tool that incorporates the development potential allowed by existing zoning regulations under existing municipal regulations.

• Structural and Non-Structural Recommendations: Suggestions from the Brandywine Flood Study for each municipality.

The second page of each Municipal Flood Inventory and Assessment:

• Municipal Flood Report Map: Areas of concern from discussion with each municipality.

• Municipal Map: A summary of the elements the map graphically displays.

• Additional Municipal Recommendations: Suggested actions developed from available research, public feedback, and regional recommendations.

Brandywine & Christina Hundreds, New Castle County Delaware | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ 18 reported flooding locations adjacent to main stem of the Brandywine Creek

➢ 2 bridges/culverts in Brandywine and Christina Hundreds undersized

Additional Municipal Recommendations

➢ Refer to the Lower Brandywine Flooding Study and Mitigation Strategy in partnership with the City of Wilmington

➢ Preserve and enhance ecological functions of riparian areas

➢ Support recommendations of the Brandywine Flood Study for subbasin B16

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Continue participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Data sources: Floodplains from FEMA, 2017. Public and Private Schools from NCES, 2024. Impervious surface from DVRPC, 2015. Municipality-noted concerns provided by municipalities, 2024. Bridges from PENNDOT, DELDOT, and University of Delaware, 2025.

Birmingham Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

Birmingham Township Summary

➢ 94% of the Township is within the Brandywine Watershed

➢ Township features the Brandywine Creek to the West (3.6 miles) with the following tributaries: Radley Run, Plum Run. Harvey’s Run, Renwick Run, Wylie Run, and Brinton Run

➢ Landscapes3 Designation: Predominately rural and suburban

➢ FEMA floodplain acres: 646 acres

➢ Population: 4,082 (2020 Census) 4,221 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 41% (1,610 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models.

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

Birmingham Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Majority of concerns are located along the Main Stem of Brandywine Creek

➢ 20 reported flooding locations

➢ 3 reports of debris jams

➢ 3 reports classified as other, ex: hazardous debris

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 14, B16

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Caln Township Summary

Caln Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

➢ 100% of the Township is within the Brandywine Watershed

➢ Tributaries in Township: East Branch of Brandywine Creek (0.75 miles) runs along the northwest corner of Township,

➢ Valley Run, Beaver Creek flow through township

➢ Landscapes3 Designation: Predominately suburban, with both an urban and suburban center along Route 30

➢ FEMA floodplain acres: 480 acres

➢ Population: 14,432 (2020 Census) 11,916 (2000 Census)

➢ Karst geology present

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 22% (953 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on future flood models. Study identified 1 undersized culvert/bridge:

o RM 6,510, Beaver Creek

Flood Improvement Non-Structural Solutions

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Create a dedicated municipal open space funding program

Caln Township, Chester County | Brandywine Flood Inventory and Assessment 202 5

Municipal Map Summary

➢ Majority of concerns are located along the East Branch of the Brandywine Creek at the north east corner of Township

➢ Specific concerns: ‘Lake’ at Wedgewood Complex , Amtrak underpasses on Lincoln Highway flood , basins near GO Carlson do not infiltrate

➢ Karst geology, sinkhole problems from Lincoln Highway and northward

➢ 7 reports of flooding

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B2, B9, B12

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Chadds Ford Township, Delaware County

Brandywine Flood Inventory and Assessment 2025

Chadds Ford Township Summary

➢ 94% of the municipality is within the Brandywine Watershed

➢ Municipality features the Brandywine Creek to the West (~4 miles) with the following tributaries: Harvey’s Run, Brinton Run, Wilson Run, Beaver Creek

➢ Delaware County 2035 Designation: Growing residential suburbs, featuring primarily open space and a town center

➢ FEMA floodplain acres: 409 acres

➢ Population: 3,972 (2020 Census)

(2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 31% (1,679 ac.) of the Brandywine Watershed is protected in the Township

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models, including those identified by the Study as contributing to flooding:

o RM 22,413, Main Stem

o RM 23,660, Main Stem

o RM 23,743, Main Stem

Flood Improvement Non -Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Municipal Map Summary

➢ Majority of concerns are located along the Main Stem of Brandywine Creek

➢ 17 reported flooding locations

➢ 1 reports of debris jams

➢ 1 report classified as other, ex: hazardous debris

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B14, B16

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Chadds Ford Township, Delaware County | Brandywine Flood Inventory and Assessment 2025

City of Coatesville, Chester County

Brandywine Flood Inventory and Assessment 202 5

City of Coatesville Summary

➢ 100% of the City is within the Brandywine Watershed

➢ West Branch of the Brandywine Creek runs north to south in the City of Coatesville (~0.75 miles)

➢ A small portion of Sucker Run lies in the southwest of the City

➢ Landscapes3 Designation: Urban Center

➢ FEMA floodplain acres: 107.5 acres

➢ Population: 13,350 (2020 Census) 10,838 (2000 Census)

➢ Township falls entirely within the Piedmont Uplands characterized by karst geology

Flood Improvement Structural Solutions

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 11% (110 ac.) of the Brandywine Watershed is protected in the City

Flood Improvement Non-Structural Solutions

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

City of Coatesville, Chester County | Brandywine Flood Inventory and Assessment 202 5

Map Summary

➢ Majority of concerns are located along the West Branch of the Brandywine Creek

➢ 13 reports of flooding

Additional Municipal Recommendations

➢ Preserve and enhance ecological functions of riparian landscapes Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Consider dedicated municipal open space funding

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 3

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Downingtown Borough, Chester County

Brandywine Flood Inventory and Assessment 202 5

Downingtown Borough Summary

➢ 100% of the Borough is within the Brandywine Watershed

➢ East Branch of Brandywine Creek flows through the Borough (~1.5 miles), a small portion of Beaver Creek (~0.25 miles) flows from the west side of Borough

➢ Landscapes3 Designation: Urban Center

➢ FEMA floodplain acres: 270.4 acres

➢ Population: 7,892 (2020 Census)

7,589 (2000 Census)

➢ Karst geology present

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 12% (148.5 ac.) of the Brandywine Borough

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models including those identified by the Study as contributing to flooding:

o RM 23,660, Main Stem

o RM 1,388, Beaver Creek

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

➢

Municipal Map Summary

➢ Majority of concerns are located at the intersection of Creek Road and Route 30

➢ 3 municipal reports of flooding

➢ 4 public reports of flooding , not included in the map above

Additional Municipal Recommendations

➢ Continue to preserve open space

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasins B9, B10, B12

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Downingtown Borough, Chester County | Brandywine Flood Inventory and Assessment 202

East Bradford Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

East Bradford Township Summary

➢ 100% of the municipality is within the Brandywine Watershed

➢ Municipality features the East and West Branches and a portion of the Main Stem of the Brandywine Creek to the West (~9 miles) with the following tributaries: Plum Run, Blackhorse Run, Taylor Run, Valley Creek, Broad Run

➢ Landscapes3 Designation: Predominately suburban rural

➢ FEMA floodplain acres: 1309.7 acres

➢ Population: 10,339 (2020 census) 10,599 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 43% (3,948 ac.) of the Brandywine Watershed is protected in the Township

Build Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models, including those identified by the Study as contributing to flooding :

o RM 39,913, East Branch

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

East Bradford Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Data sources: Floodplains from FEMA, 2017. Public and Private Schools from NCES, 2024. Impervious surface from DVRPC, 2015.

Municipality-noted concerns provided by municipalities, 2024. Bridges from PENNDOT, DELDOT, and University of Delaware, 2025.

Municipal Map Summary

➢ Majority of concerns are located along the West and East Branches of Brandywine Creek

➢ 12 reported flooding locations

➢ 3 reports of debris jams

➢ 14 reports classified as other, ex: flooding depth on roads (inches)

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B7, B10, B13, B14

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

East Nantmeal Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

East Nantmeal Township Summary

➢ 51% of the Township is within the Brandywine Watershed

➢ Marsh Creek serves as the southwestern boundar y (~4.5 miles)

➢ Landscapes3 Designation: Rural and Agricultural

➢ FEMA floodplain acres 516.2 acres

➢ Population: 1,832 (2020 census) 1,787 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 60% (3,174 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

East Nantmeal Township, Chester County | Brandywine Flood Inventory and Assessment 202 5

Municipal Map Summary

➢ Major flooding is not currently a municipal concern

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian landscapes

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 11

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

East Brandywine Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

East Brandywine Township Summary

➢ 100% of the Township is within the Brandywine Watershed

➢ Township features the East Branch of the Brandywine Creek to the East (~4.5 miles) with the following tributaries: Beaver Creek, Culbertson Run

➢ Landscapes3 Designation: Predominately

Suburban Rural

➢ FEMA floodplain acres: 413 acres

➢ Population: 9,738 (2020 census)

5,822 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 22% (1,499 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Emergency preparedness planning

Public

and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Municipal Map Summary

➢ Majority of concerns are located along the East Branch of Brandywine Creek and major tributaries

➢ 13 reported flooding locations, classified as other

➢ 5 reports classified as other, ex: water treatment plants, detention basins

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin s B8, B9, B12

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

East Brandywine Township, Chester County | Brandywine Flood Inventory and Assessment 2025

East Caln Township, Chester County

Brandywine Flood Inventory and Assessment 2025

East Caln Township Summary

➢ 100% of the Township is within the Brandywine Watershed

➢ The East Branch of the Brandywine Creek flows along the western boundar y (~2 miles)

➢ Valley Creek runs along the most southeastern portion of the township (~1 mile)

➢ Landscapes3 Designation: Predominately suburban, with an urban center and rural

➢ FEMA floodplain acres 132.9 acres

➢ Population: 5,384 (2020 Census) 2,857 (2000 Census)

➢ Karst geology present

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 14% (293 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Solutions

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

➢

East Caln Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Majority of concerns are located along the East Branch of the Brandywine Creek, particularly along the west side of the township bordering Downingtown

➢ 3 reports of flooding

Additional Municipal Recommendations

➢ Preserve and enhance ecological functions of riparian landscapes Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin s B9, B10, B13

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

East Fallowfield Township, Chester County

Brandywine Flood Inventory and Assessment 2025

East Fallowfield Township Summary

➢ 100% of the Township is within the Brandywine Watershed

➢ Township features the West Branch of the Brandywine Creek to the East (~ 1.5 miles) with the following tributaries: Buck Run (~ 9 miles)

➢ Landscapes3 Designation: Predominately

Suburban Agricultural

➢ FEMA floodplain acres: 588.8 acres

➢ Population: 7,626 (2020 Census)

5,157 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 39% (3,803 ac.) of the Brandywine Watershed is protected in the Township

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non -Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee

acquisitions

➢ Conservation easements

East Fallowfield Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Majority of concerns are located along Buck Run and Route 82

➢ 5 reported flooding locations

➢ 2 reports classified as other, ex: status of culverts and bridges

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin s B3, B5

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

East Marlborough Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

East Marlborough Township Summary

➢ 35% of the Township is within the Brandywine Watershed

➢ Township features the headwaters of tributaries of the Brandywine Creek: Bennetts Run, Pocopson Creek, Lost Trail Creek, Red Fox Run, Green Valley Creek, in addition to both East and West Branches of the Red Clay Creek (Christina River Watershed)

➢ Landscapes3 Designation: Predominately Suburban and Agricultural

➢ FEMA floodplain acres: 79.7 acres

➢ Population: 7,306 (2020 census)

6,317 (2000 census)

➢ Geology features carbonate rock in the southwest

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 46% (1,577 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢

East Marlborough Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Majority of concerns are located along the West Branch Red Clay Creek and smaller tributaries

➢ 4 municipal reports classified as other, ex: function of bridges and culverts

➢ 1 public report of flooding, not included on the map above

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B4, B15

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Highland Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

Highland Township Summary

➢ 79% of the Township is within the Brandywine Watershed

➢ Doe Run flows along the southern border of Township (~5.5 miles), Buck Run flows along the eastern border of Township (~4.5 miles), Birch Run flows through the center of Township (~2 miles)

➢ Landscapes3 Designation: Predominantly agriculture with a small portion suburban in the northwest

➢ FEMA floodplain acres: 319 acres

➢ Population: 1,259 (2020 Census) 1,125 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 78% (5,504 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Highland Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ 2 reports of flooding, classified as ‘other ’, ex: debris

➢ Major flooding is not currently a municipal concern

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian landscapes

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 5, B6

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Honey Brook Borough, Chester County

Brandywine Flood Inventory and Assessment 202 5

Honey Brook Borough Summary

➢ 100% of the Borough is within the Brandywine Watershed

➢ Borough is located at the headwaters of the Brandywine Creek

➢ Unnamed tributary of the Brandywine Creek flows through the southwest of Borough (~0.5 miles)

➢ Landscapes3 Designation: Urban Center

➢ FEMA floodplain acres: 0 acres

➢ Population: 1,892 (2020 Census)

1,287 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 6% (14.66 ac.) of the Brandywine Watershed is protected in the Borough

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space fund ing program

Municipal Map Summary

➢ Major flooding is not currently a municipal concern , as the Borough is situated at the headwaters of the Brandywine Creek Watershed

➢ 3 flooding reports classified as other, ex: failing basins, undersized culverts

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian landscapes

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 1

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Honey Brook Borough, Chester County | Brandywine Flood Inventory and Assessment 2025

Honey Brook Township, Chester County Brandywine Flood Inventory and Assessment 202 5

Honey Brook Township Summary

➢ 92% of the Township is within the Brandywine Watershed

➢ Township is located at the headwaters of the Brandywine Creek

➢ The West Branch of the Brandywine Creek runs from the northeast to the southwest of the Township (~7.5 miles) with additional headwater tributaries

➢ Landscapes3 Designation: Predominantly agricultural and rural, with an urban center (Honey Brook Borough)

➢ FEMA floodplain acres: 1,473 acres

➢ Population: 8,274 (2020 Census) 6,278 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 35% (5,348 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Municipal Map Summary

➢ 2 reports of flooding

➢ 3 reports of flooding, classified as ‘other ’, ex: failing basin, undersized culverts

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian landscapes

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 1, B2, B8

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Honey Brook Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Data sources: Floodplains from FEMA, 2017. Public and Private Schools from NCES, 2024. Impervious surface from DVRPC, 2015. Municipalitynoted concerns provided by municipalities, 2024. Bridges from PENNDOT, DELDOT, and University of Delaware, 2025.

Londonderry Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

Londonderry Township Summary

➢ 63% of the Township is within the Brandywine Watershed

➢ Tributaries: Doe Run runs along the n orthern boundary of Township (~5.5 miles), Headwaters of Middle Branch White Clay Creek (~1.5 miles)

➢ Landscapes3 Designation: Rural & Agricultural

➢ FEMA floodplain acres: 271.6 acres

➢ Population: 2,476 (2020 Census) 1,632 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 68% (3,106 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Municipal Map Summary

➢ 2 reports of flooding

➢ 8 reports of flooding classified as “other ”, ex: stream debris

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian landscapes

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 6

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

➢

Londonderry Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Modena Borough , Chester County

Brandywine Flood Inventory and Assessment 202 5

Modena Borough Summary

➢ 100% of the Borough is within the Brandywine Watershed

➢ The West Branch of the Brandywine Creek runs east to west through the Borough (~1 mile)

➢ Tributaries include Dennis Run from the south and an unnamed tributary from the north

➢ Landscapes3 Designation: Urban Center

➢ FEMA floodplain: 58.64 acres

➢ Population: 544 (2020 census)

610 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 4% (9 ac.) of the Brandywine Watershed is protected in the Borough

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models, including those identified by the Study as contributing to flooding :

o RM 75,551, West Branch

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

Map Summary

➢ Majority of concerns are located along the West Branch Brandywine Creek

➢ 5 reports of flooding , 3 categorized as other

➢ 3 reports of debris jams, categorized as other

➢ 18 reports classified as other, ex: flood damages

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 3

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Modena Borough , Chester County | Brandywine Flood Inventory and Assessment 2025

Newlin Township Summary

Newlin Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

➢ 100% of the Township is within the Brandywine Watershed

➢ Township features the West Branch of the Brandywine Creek (~7.5 mi) with multiple tributaries

➢ Landscapes3 Designation: Predominately agricultural and rural

➢ FEMA floodplain acres: 977 acres

➢ Population: 1,358 (2020 Census) 1,150 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 65% (4,926 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Newlin Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ 14 reported flooding locations

➢ 1 report classified as other, ex: hazardous debris

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasins B3, B4, B5, B15

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Parkesburg Borough, Chester County

Brandywine Flood Inventory and Assessment 202 5

Parkesburg Borough Summary

➢ 90% of the Borough is within the Brandywine Watershed

➢ Borough features minor tributaries that are headwaters of Brandywine Creek

➢ Landscapes3 Designation: Urban Center

➢ FEMA floodplain acres: 33.55 acres

➢ Population: 3,862 (2020 census)

3,373 (2000 census)

➢ Geology features: Carbonate Rocks

Build- Out Analysis (for portions of the

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 3% (21 ac.) of the Brandywine Watershed is protected in the Borough

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

Municipal Map Summary

➢ Majority of concerns are located along a tributary of Buck Run

➢ 6 reports flooding locations

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B5

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Parkesburg Borough, Chester County | Brandywine Flood Inventory and Assessment 2025

Pennsbury Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

Pennsbury Township Summary

➢ 94% of the Township is within the Brandywine Watershed

➢ Brandywine Creek serves as the eastern boundar y (~6 miles)

➢ Major tributaries include Bennetts Run, Ring Run and Craigs Mill Run, with a portion of Pocopson Creek as a northern border

➢ Landscapes3 Designation: Predominately Rural and Suburban

➢ FEMA floodplain: 499.8 acres

➢ Population: 3,871 (2020 Census) 3,500 (2020 Census)

Open Space Inventory

➢ Dedicated Municipal Funding: Yes

➢ Approximately 40% (2,384 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models, including those identified by the Study as contributing to flooding :

o RM 22,413, Main Stem

o RM 23,660, Main Stem

o RM 23,743, Main Stem

Flood Improvement Non-Structural Solutions

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Pennsbury Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Map Summary

➢ Majority of concerns are located along the Main Stem, with some concerns along tributaries

➢ 19 reports of flooding

➢ 6 reports classified as other, ex: undersized culverts

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 14, B15, B16

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Pocopson Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

Pocopson Township Summary

➢ 100% of the Township is within the Brandywine Watershed

➢ Brandywine Creek serves as the eastern boundar y (~2.75 miles), West Branch of the Brandywine Creek serves as the northern border of Township (~3.75 miles), Pocopson Creek flows along southern portion of Township (~5.5 miles)

➢ Landscapes3 Designation: Northern - Rural Landscape; Southern Suburban Landscape

➢ FEMA floodplain acres: 772 acres

➢ Population: 4,455 (2020 Census)

3,350 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 37% (1,895 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Pocopson Township, Chester County | Brandywine Flood Inventory and Assessment 202 5

Municipal Map Summary

➢ Majority of concerns are located along the West Branch and Main Stem of Brandywine Creek

➢ Township flooding concerns south of Shaw’s Bridge Park, Locust Road, Waterglen Drive, Brinton’s Bridge Road

➢ 13 reports of flooding

➢ 9 reports of debris jams

➢ 10 reports classified as other

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian landscapes

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B4, B14, B15

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

South Coatesville Borough, Chester County

Brandywine Flood Inventory and Assessment 202 5

South Coatesville Borough Summary

➢ 100% of the Township is within the Brandywine Watershed

➢ West Branch of the Brandywine Creek (~1.5 miles) flows through Borough

➢ Landscapes3 Designation: Urban Center

➢ FEMA floodplain acres: 75.6 acres

➢ Population: 1,601 (2020 census) 997 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 10% (109 ac.) of the Brandywine Watershed is protected in the Borough

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models Study recommends the following infrastructure for further analysis:

o RM 81,718, West Branch

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

➢ River corridor easements ➢

easement

Municipal Map Summary

➢ Majority of concerns are located along the West Branch of the Brandywine Creek, near the border with Modena Borough

➢ 1 report of flooding

➢ 14 reports of flooding , classified as “other”, ex: hazardous debris

Additional Municipal Recommendations

➢ Continue to preserve open space

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B3

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

South Coatesville Borough, Chester County | Brandywine Flood Inventory and Assessment 202 5

Sadsbury Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

Sadsbury Township Summary

➢ 93% of the Township is within the Brandywine Watershed

➢ Buck Run, a major tributary of Brandywine Creek, bisects the township (~4 miles)

➢ Landscapes3 Designation: Mix of Rural, Agricultural, Suburban, and Suburban Center Landscapes

➢ FEMA floodplain: 347 acres

➢ Population: 4,125 (2020 Census) 2,941 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 32% (1,195 ac.) of the Brandywine Watershed is protected in the Township 43%

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

➢

Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Majority of concerns are located along the Main Stem of Buck Run

➢ 8 reports of flooding

➢ 1 report of debris jam

Additional Municipal Recommendations

➢ Continue to preserve open space

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B5

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Sadsbury

Thornbury Township Summary

Thornbury Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

➢ 19% of the Township is within the Brandywine Watershed

➢ Radley Run (~1 mi) flows through the western portion of township

➢ Landscapes3 Designation: Predominately agriculture and rural

➢ FEMA floodplain acres: 22 acres

➢ Population: 3,177 (2020 Census) 2,678 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 44% (204 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood

Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language ➢ River corridor easements

Thornbury Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Major flooding within the Brandywine Watershed is not currently a municipal concern

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 14

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Upper Uwchlan Township, Chester County

Brandywine Flood Inventory and Assessment 2025

Upper Uwchlan Township Summary

➢ 73% of the Township is within the Brandywine Watershed

➢ East Branch of Brandywine Creek serves as the southwestern boundary (~3.5 miles)

➢ Features Marsh Creek Reservoir, Marsh Creek, Black Horse Creek and other minor tributaries

➢ Landscapes3 Designation: Mostly Suburban and Rural Landscapes, with a Suburban Center

➢ FEMA floodplain: 947.7 acres

➢ Population: 13,480 (2020 census)

12,275 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 31% (1,700 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

➢

Municipal Map Summary

➢ Majority of concerns are located along the West Branch and Main Stem of Brandywine Creek

➢ 4 reports of flooding

➢ 2 reports of debris jams

➢ 2 reports classified as other

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B8, B11

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Upper Uwchlan Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Uwchlan Township Summary

Uwchlan Township, Chester County

Brandywine Flood Inventory and Assessment 2025

➢ 67% of the Township is within the Brandywine Watershed

➢ East Branch of Brandywine Creek serves as the southwestern boundary (~2 miles)

➢ Features Shamona Creek and minor tributaries

➢ Landscapes3 Designatio n: Majority Suburban with a Suburban Center

➢ FEMA floodplain: 76.4 acres

➢ Population: 19,161 (2020 census) 16,576 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 16% (727 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Municipal Map Summary

➢ Majority of concerns are located along the East Branch of Brandywine Creek and Shamona Creek

➢ 3 reports of flooding

➢ 12 reports classified as other, ex: bridge repairs and streambank stabilization

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 9, B13

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Uwchlan Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Valley Township Summary

Valley Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

➢ 100% of the Township is within the Brandywine Watershed

➢ West Branch of Brandywine Creek is located on the eastern boundary (~2 miles)

➢ Features Sucker Run, Rock Run and minor tributaries

➢ Landscapes3 Designation: Suburban Landscape with Urban and Suburban Centers

➢ FEMA floodplain: 144.5 acres

➢ Population: 7,985 (2020 Census)

2,093 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 12% (403 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models, including those identified by the Study as contributing to flooding :

o RM 88,244, West Branch

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢

Valley Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Concerns are located along the West Branch of Brandywine Creek but also along tributaries

➢ 11 reports of flooding

➢ 2 reports of debris jams

➢ 8 reports classified as other, ex: stormwater infrastructure under performing

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin s B2, B3

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

West Brandywine Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

West Brandywine Township Summary

➢ 100% of the Township is within the Brandywine Watershed

➢ Township features the West Branch of the Brandywine Creek to the west (~6.3 mi)

➢ Features tributaries including Beaver Creek, Culbertson Run, Indian Run

➢ Landscapes3 Designation: Predominately

Suburban Rural

➢ FEMA floodplain acres: 484.5 acres

➢ Population: 7,331 (2020 census)

7,153 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 15% (1,228 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Municipal Map Summary

➢ Majority of concerns are located along the West Branch of Brandywine Creek

➢ 5 reports flooding locations, classified as other

➢ 10 reports classified as other, ex: function of bridges, culverts, pumping station

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 2, B8, B12

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

➢

West Brandywine Township, Chester County | Brandywine Flood Inventory and Assessment 2025

West Caln Township Summary

West Caln Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

➢ 75% of the Township is within the Brandywine Watershed

➢ Township features the West Branch of the Brandywine Creek to the East (~4 miles) with the following tributaries: Rock Run, Birch Run

➢ Landscapes3 Designation: Mix of Suburban, Rural and Agricultural

➢ FEMA floodplain acres: 591 acres

➢ Population: 8,910 (2020 Census) 7,054 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 28% (4,926 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

West Caln Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Data sources:

Municipal Map Summary

➢ 3 reported flooding locations

➢ 1 report classified as other, ex: hazardous debris

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B2

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA C ommunity Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Floodplains from FEMA, 2017. Public and Private Schools from NCES, 2024. Impervious surface from DVRPC, 2015. Municipality-noted concerns provided by municipalities, 2024. Bridges from PENNDOT, DELDOT, and University of Delaware, 2025.

West Goshen Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

West Goshen Township Summary

➢ 36% of the Township is within the Brandywine Watershed

➢ Taylor Run (~0.5 mi) and John Smedley Run (~1 mi) originate in township

➢ Landscapes3 Designation: Suburban with a suburban center

➢ FEMA floodplain acres: 205 acres

➢ Population: 23,040 (2020 Census) 20,495 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 6% (175 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

West Goshen Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ 0 reports of flooding

➢ Hazard Mitigation Plan: East Chestnut Street & Montgomery Street, S Bolmar Street, Oak Lane

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B1 0, B13, B14

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Wallace Township Summary

Wallace Township, Chester County

Brandywine Flood Inventory and Assessment 202 5

➢ 100% of the Township is within the Brandywine Watershed

➢ East Branch of Brandywine Creek bisects the township along Rt 282 (~4 miles)

➢ Featuring Indian Run and North Branch Indian Run as major tributaries

➢ Landscapes3 Designation: Predominantly Rural Landscape

➢ FEMA floodplain: 500.2 acres

➢ Population: 3,711 (2020 census)

3,240 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 21% (1,595 ac.) of the Brandywine Watershed is protected in the Township

Build- Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non-Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space funding program

Municipal Map Summary

➢ Majority of concerns are located along the West Branch and Main Stem of Brandywine Creek

➢ 5 reports of flooding, classified as other ex: debris jam

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B8, B11

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

Wallace Township, Chester County | Brandywine Flood Inventory and Assessment 2025

West Bradford Township, Chester County

Brandywine Flood Inventory and Assessment 2024

West Bradford Township Summary

➢ 100% of the Township is within the Brandywine Watershed

➢ West and East Branches of Brandywine Creek serves as the southern and eastern boundaries (~6 miles)

➢ Features Broad Run, headwaters of Mason Dixon Run and Sycamore Run and other minor tributaries

➢ Landscapes3 Designation: Northern - Suburban Landscape; Southern- Rural Landscape

➢ FEMA floodplain: 490.4 acres

➢ Population: 14,316 (2020 census) 10,775 (2000 census)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Open Space Inventory

➢ Dedicated Municipal Funding: Yes

➢ Approximately 29% (3,247 ac.) of the Brandywine Watershed is protected in the Township

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

West Bradford Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Majority of concerns are located along Broad Run, a major tributary of Brandywine Creek

➢ 7 reports of flooding , with 2 classified as other

➢ 5 reports classified as other, ex: status of culverts

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B3, B4, B7 , B10

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

West Chester Borough , Chester County

Brandywine Flood Inventory and Assessment 2025

West Chester Borough Summary

➢ 57% of the Borough is within the Brandywine Watershed

➢ Plum Run (~0.4 mi) originates in Borough

➢ Landscapes3 Designation: Urban center

➢ FEMA floodplain acres: 12 acres

➢ Population: 18,671 (2020 Census)

17,861 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 5% (36 ac.) of the Brandywine Watershed is protected in the Borough

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non -Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

Municipal Map Summary

➢ Major flooding is not currently a municipal concern

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B10, B14

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

West Chester Borough, Chester County | Brandywine Flood Inventory and Assessment 2025

West Marlborough Township, Chester County

Brandywine Flood Inventory and Assessment 2025

West Marlborough Township Summary

➢ 65% of the Township is within the Brandywine Watershed

➢ Buck Run and Doe Run, Major tributaries of Brandywine Creek, cross the northwestern section of the township (~6 miles)

➢ Landscapes3 Designation: 100% Agricultural Landscape

➢ FEMA floodplain: 662.5 acres

➢ Population: 819 (2020 Census) 859 (2000 Census)

Open Space Inventory

➢ Dedicated Municipal Funding: No

➢ Approximately 85% (6,020.5 ac.) of the Brandywine Watershed is protected in the Township

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non -Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

• Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space program

Municipal Map Summary

➢ 1 reports of flooding

➢ 6 reports classified as other, ex: status of culverts and bridges

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin s B5, B6

➢ Review, update, and implement the municipal projects identified in the County Hazard Mitigation Plan

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Plain Insurance

April 2025

West Marlborough Township, Chester County | Brandywine Flood Inventory and Assessment 2025

West Nantmeal Township, Chester County

Brandywine Flood Inventory and Assessment 2025

West Nantmeal Township Summary

➢ 79% of the Township is within the Brandywine Watershed

➢ Township is bisected by the East Branch of the Brandywine Creek (~2.75 mi)

➢ Features tributaries including South Branch French Creek, North Branch Indian Run, Marsh Creek

➢ Landscapes3 Designation: Rural Agricultural

➢ FEMA floodplain acres: 569.9 acres

➢ Population: 2,251 (2020 census) 2,031 (2000 census)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Open Space Inventory

➢ Dedicated municipal funding: No

➢ Approximately 35% (2,378 ac.) of the Brandywine Watershed is protected in the Township

Flood Improvement Non -Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

➢ Create a dedicated municipal open space program

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

Municipal Map Summary

➢ Majority of concerns are located along the East Branch of Brandywine Creek

➢ 1 report classified as other

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B 8, B11

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

West Nantmeal Township, Chester County | Brandywine Flood Inventory and Assessment 2025

West Whiteland Township, Chester County Brandywine Flood Inventory and Assessment 2025

West Whiteland Township Summary

➢ 87% of the Township is within the Brandywine Watershed

➢ Tributaries: Valley Creek (~3.5 miles) runs through the center of the township and Broad Run (~2.5 miles) runs through the SW corner of township

➢ Landscapes3 Designation: Suburban

➢ FEMA floodplain acres: 806.2 acres

➢ Population: 19,632 (2020 census)

16,499 (2000 census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 41% (1,610 ac.) of the Brandywine Watershed is protected in the Township

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Solutions

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non -Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation

Review existing conservation easement

Municipal Map Summary

➢ 2 reports of flooding

➢ Public input map also reported 3 locations of flooding along Valley Creek and Broad Run

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B13

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

West Whiteland Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Westtown Township, Chester County

Brandywine Flood Inventory and Assessment 2025

Westtown Township Summary

➢ 18% of the Township is within the Brandywine Watershed

➢ Radley Run (~0.6 miles) flows through Township

➢ Landscapes3 Designation: predominantly suburban

➢ FEMA floodplain acres: 772.2 acres

➢ Population: 11,154 (2020 Census) 10,352 (2000 Census)

Open Space Inventory

➢ Dedicated municipal funding: Yes

➢ Approximately 8% (82 ac.) of the Brandywine Watershed is protected in the Township

Build-Out Analysis (for portions of the municipality in the Brandywine Watershed)

Flood Improvement Structural Recommendations

➢ Floodplain restoration

➢ Flood mitigation dry ponds

➢ Implement stormwater reduction measures

➢ Evaluate bridges, culverts and dams based on Chapter 6 recommendations and future flood models

Flood Improvement Non -Structural Recommendations

➢ Emergency preparedness planning

➢ Public alerts and readiness

➢ Enforcing and enhancing floodplain regulations

➢ Structural elevations, floodproofing, property buyouts

➢ Public education and engagement

➢ Fee simple acquisitions

➢ Conservation easements

o Review existing conservation easement language

➢ River corridor easements

Westtown Township, Chester County | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ Undersized culvert under W Pleasant Grove Road creates flooding near Route 202

➢ Flooding behind homes on Spring Line Drive and on West Street Road at the bridge

Additional Municipal Recommendations

➢ Continue to preserve open space and agricultural lands

➢ Preserve and enhance ecological functions of riparian areas

➢ Limit development of steep slopes, consider adopting additional slope protection ordinances

➢ Implement municipal level projects for localized solutions

➢ Support recommendations of the Brandywine Flood Study for subbasin B14

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA C ommunity Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

City of Wilmington, New Castle County, Delaware | Brandywine Flood Inventory and Assessment 2025

Municipal Map Summary

➢ 23 reported flooding locations adjacent to main stem of the Brandywine Creek

➢ 3 bridges bridges/culverts in City undersized

Additional Municipal Recommendations

➢ Refer to the Lower Brandywine Flooding Study and Mitigation Strateg y as conducted by the City of Wilmington

➢ Preserve and enhance ecological functions of riparian areas

➢ Support recommendations of the Brandywine Flood Study for subbasin B17

➢ Review, update and implement projects for MS4 compliance and municipal projects identified in current and future County Hazard Mitigation Plans

➢ Consider participation in the FEMA Community Rating System program to reduce local flood insurance premium costs and encourage residential participation in the National Flood Insurance Program

April 2025