Lake Dredging POLLUTANTS ADDRESSED: Sediments, Nutrients and Organics, Salinity
DESCRIPTION: Dredging is an excavation activity in which materials are recovered from beneath the water's surface. The purpose is generally to gather bottom sediment and either dispose it at a different location or to excavate the roots of nuisance weeds which concentrate nutrients. By removing these nutrients the cycle of lake eutrophization can be terminated.
POTENTIAL TREATMENT AREAS: Lakes in agricultural/ranch lands Lakes in development lands ALTERNATIVE MANAGEMENT MEASURES: Pole/Post Planting Vertical Bundle Willow Fascines Brush or Tree Revetment
LOAD REDUCTION MECHANISM: Organics/Nutrients Management- Nutrients deposited in the lake by overland flow and stream waters, then absorbed by lake plants, are removed by dredging.
PERMITTING REQUIREMENTS: Requirements vary by location. A permit under sections 404 and 401 of the Clean Water Act, and/or county floodplain.
LAND USE CLASSIFICATION: Agricultural and Ranch Lands Disturbed Areas Urban Lands
Contact county regional flood control district.
ADDITIONAL BENEFITS: Open stream flow-lane and produce material to be used within-banks placement. It can be used to enhance or restore habitat. It method of weed reduction.
Arid Southwest BMP
Lake Dredging POLLUTANTS ADDRESSED: Sediments, Nutrients and Organics, Salinity Level 500: INTENSE ENGINEERING
LOAD REDUCTION POTENTIAL: LOW
Riparian Planting Zone: Base flow/Toe Zone
ESTIMATED TIME FOR LOAD REDUCTION: IMMEDIATE
> 2 YEARS
EXPECTED MAINTENANCE: LOW
ESTIMATED COST: LOW
PLANNING AND IMPLEMENTATION: Dredging requires a company that will work closely with your engineering team to utilize the right dredging equipment for your particular project. Each dredging project is different and therefore requires the equipment to be tailored for optimum project performance and a project feasibility studies, and cutter calculations are the professional assistance you will need.
Arid Southwest BMP
Photo courtesy of: Dredging Company, Inc http://www.dscdredge.com/dredgeapplications.htm.