AWWA ACE63091

This slide presentation outlines a pilot program to demonstrate the use of best management practices for the mitigation of sediment and loading to Lake Lewisville from the Hickory Creek Watershed. A second objective was to create economic incentives for the development of water quality credit trading to control of point and nonpoint source pollution through the use of municipal development code. Lake Lewisville is currently threatened by sediment and nutrients, it is #96 out of 102 Texas reservoirs for eutrophication, there are a high rate of applications for new or amended discharge permits, rapid land use conversion, storage capacity reduced by sediment loads, major water supply reservoir, and significant recreation resource. Topics outlined include: water quality credit trading; SWAT model calibrated for Lake Lewisville land uses; application of the watershed framework; pro forma evaluation of sediment control costs; model development - urban loads, sediment calibration, nitrogen; change in land use from natural conditions; increased loads due to development; application to city code; and, application to water supply planning.