Stream Representation Clause Samples

Stream Representation. Modeling subwatersheds and calibrating hydrologic and water quality model components requires routing flow and pollutants through streams and comparing the modeled concentrations to water quality criteria. Each subwatershed was represented with a single stream. Stream segments were identified using the USGS NHD stream coverage. To route flow and pollutants, rating curves must be developed. Rating curves were developed for each stream using ▇▇▇▇▇▇▇'▇ equation and representative stream data. Required stream data include slope, ▇▇▇▇▇▇▇'▇ roughness coefficient, and stream dimensions, including mean depths and channel widths. ▇▇▇▇▇▇▇'▇ roughness coefficient was assumed to be 0.05 for all streams (representative of natural streams). Slopes were calculated based on digital elevation model (DEM) data and stream lengths measured from the NHD stream coverage. Stream dimensions were estimated using regression curves that relate upstream drainage area to stream dimensions (Rosgen, 1996).