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DWSM, the dynamic watershed simulation model, was expanded with a subsurface and a reservoir flow routing schemes. The hydrology and sediment components of the model were applied to three agricultural watersheds in Illinois, Big Ditch (100 km2), Court Creek (250 km2), and Upper Sangamon River (2,400 km2), to simulate spatially and temporally varying surface and subsurface storm water runoff, propagation of flood waves, upland soil and streambed erosion, and sediment transport; to evaluate these simulation capabilities through calibration and validation; and to conduct various watershed investigative analyses. The new schemes were selected from the literature. DWSM was able to simulate the major hydrologic, soil...
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A Dynamic Watershed Simulation Model (DWSM) is being developed to simulate rainfall-runoff, propagation of flood waves, soil erosion, and transport of sediment and commonly used agricultural chemicals in agricultural and rural watersheds. The model is being tested on the Big Ditch watershed in Illinois using rainfall, flow, sediment, nutrient, and pesticide data collected during 1998 and 1999 rainfall events. This 100- square-kilometer watershed is a subwatershed of the Upper Sangamon River basin draining into the Lake Decatur, a water supply reservoir. The lake periodically violates drinking water standards on nitrate-nitrogen concentration. It has high sedimentation rate reducing the lake capacity. The goal is...
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Flow and concentrations of suspended sediment, nitrate–N, phosphate–P, atrazine, and metolachlor were monitored during the spring seasons of 1998 and 1999, primarily during storm events, at a tributary station (Big Ditch) and two main–stem stations (Fisher and Mahomet) of the Upper Sangamon River watershed in east central Illinois. These three stations respectively drain 98, 622, and 932 km2 of mainly agricultural lands. Rainfall data were collected from six newly established raingage stations. The study provides a valuable database to understand some of the complex physical and chemical processes in an east central Illinois watershed and to calibrate, validate, and evaluate mathematical models. Analyses of the...
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