2018 RESPEC Transportation Drainage Cutsheet

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The answers to the problems we solve can’t always be found in a textbook.

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What we offer:

Our seamless veteran team has extensive experience in delivering transportation drainage engineering services and specializes in bridge hydraulics and scour analysis. RESPEC’s team understands the transportation drainage design criteria and can successfully integrate our drainage recommendations into a project working with roadway, bridge, and maintenance personnel. Our professionals analyze, design, and prepare drainage construction plans for projects ranging from small, maintenance-type efforts to large drainage improvements for major interstate highway corridors. We provide transportation drainage design recommendations and a wide array of infrastructure design capabilities to our clients.

// Permanent Water Quality Facilities

“I have worked with RESPEC on several projects over the years and they have always been easy to work with, very responsive, and have always done a great job.”

—Tom Hunt, Project Manager, CDOT

// Roadside Ditches and Channels // Culverts

// Channel Modifications // Pavement and Area Inlets // Culvert Outlet Protection // Detention Basins

// Bridge Waterway Openings

// Riprap or Other Armoring

// Bridge Scour Countermeasures

// Channel Stability Measures

// Storm Sewers

// Sediment Control Facilities

// Erosion-Control Measures

// Low-Water Crossings

// Improved Culvert Entrances

// Wetland/Riparian Vegetation.

// Grade-Control Structures

// I-25 Reconstruction Castle Rock, CO This design project involved all potential drainage elements of a highway project.

Hydrologic analyses were completed for off-site watersheds, including identifying hydrologic characteristics. Pavement drainage analyses were performed to establish inlet spacing along the concrete median barrier. In addition, FEMA floodplains within the corridor were identified and floodplain modeling was completed by using the HEC-RAS model. Erosion and sediment-control plans were developed for the corridor as well as a . stormwater management plan report. The plans and the report were prepared in accordance with the National Pollutant Discharge Elimination System (NPDES) stormwater requirements and a stormwater permit obtained from the state for construction activities.

The location, type, and design of permanent stormwater quality BMPs were also provided to mitigate potential adverse impacts to receiving water quality from the highway runoff. Approximately 13 permanent stormwater­quality facilities were designed and constructed. Channel restoration design and construction observation services were provided for the installation of five steel sheet, pilinggrade-control structures and channel modification to approximately 2,000 feet of channel along 1-25. Support of the required environmental permitting services, including 404 permit, wetland mitigation, and restoration of the Preble’s Mouse Habitat, was completed.

Dorothy Eisenbraun // Dorothy.Eisenbraun@respec.com // 720.775.6411

// ms4 work Water Quality BMP Inspections RESPEC has inventoried and performed BMP inspections for hundreds of BMPs throughout Colorado to help identify deficiencies and meet their MS4 requirements. This included reviewing all old plans, field inspections, documentation of current conditions and developing maintenance plans. Maintenance staff uses these plans to routinely monitor and maintain these existing BMPs.

Current MS4 Contract Currently, RESPEC is helping the CDOT environmental division update their MS4 permit and associated tasks with their MS4-related programs. Some of the tasks currently being completed as part of the New Development and Redevelopment Program include: // Grant Application and Outreach // Pollutants of Concern Report // Program and Guidance Document Revision

// Area of Treatment // Training Identification // Annual Reports // Drainage Design Manual Updates.

// Process Integration Into Transportation Projects

// local small drainage projects

// waldo canyon aNd US Highway 24– CDOT emergency flood response During the summer of 2012, Colorado experienced extremely devastating fires, including the Waldo Canyon fire, which burned over 15,000 acres in the Colorado Springs area and along US Highway 24. More than 32,000 residents were evacuated from the area, and the fire claimed more than 350 homes. Before this fire, the stormwater runoff from areas upstream of US Highway 24 was safely conveyed. The fire substantially altered the watershed hydrology and caused runoff rates and associated fire-scar debris to increase dramatically. The existing culvert was unable to handle the increased volume of water—a situation exasperated by debris buildup in the culvert, which caused even minor rain events to overtop into the highway. These overtopping events caused extensive roadway damage, frequent road closures, public safety concerns, and a fatality following the August 2013 flood. Within 3 days after the damaging effects of the August flood, CDOT initiated an emergency response project, and RESPEC was on the scene to evaluate the damage and mitigation options with CDOT engineers. RESPEC was tasked with designing solutions to eliminate roadway overtopping, stabilize the channel on Fountain Creek, and reduce debris impacts to downstream areas, including the town of Manitou Springs. This project had many challenges, including the multiple agencies, funding streams, and associated design and review processes as the situation went from developing emergency solutions to permanent solutions.

// Bridge replacement projects RESPEC has performed hydrologic and hydraulic analyses, bridge sizing, pier geometry, floodplain characteristics, local channel improvements, and stormwater management plans for many interstates and state highway bridge replacement projects.

We perform designs in conjunction with DOT staff and other consultants. Some projects completed by RESPEC in Colorado include:

town of parkeR mostenbocker road widening RESPEC completed the drainage design of a section of Motsenbocker Road in the Town of Parker, which was converted from a rural road to a collector with curb and gutter and turn lanes. The design added inlets and storm sewers that tied into the existing drainage system, retrofit the existing detention and water quality facilities, and developed a stormwater management plan. The improved roadway services the growing town and safely conveys and treats stormwater runoff generated by the project.

// I-70 Over Sand Creek // I-76 Over the South Place River // SH 44 Over the South Platte River // I-25 Over Sull Creek // SH 16 Over Fountain Creek

// SH 71 Over Holbrook & Ft. Lyon Canals // SH 101 Over Purgatoire River Tributary Arroyo // SH266 Over Holbrook & Ft. Lyon Canals // US 250 Over Timpas Creek Tributary Arroyo