USING SWMM TO MODEL SEDIMENT RUNOFF FROM A GOLF COURSE

摘要

Kansas State University has built an 18-hole championship golf course near Manhattan, Kansas, on the Little Kitten Creek watershed. The watershed, previously native grassland, underwent dramatic changes in land-uses since the beginning of the construction. A seven-year study was done to evaluate changes in surface water in terms of sediment concentrations. This paper was designed to compare PCSWMM (2002 version) water quality predictions with those measured values and predicted values from an AGNPS model. All attributes of the watershed were inputted into the program including area, slope, land-use, soil characteristics, channel characteristics, infiltration variables, precipitation values, and evaporation values. A drastic change was noticed during the construction phase compared to the operational phase. The sediment concentrations during some storms during construction were almost 10 times the concentrations observed prior to construction of the golf course. The sediment yield during the pre-construction phase was measured to be 845,000 kg/yr compared to 905,400 kg/yr predicted in AGNPS and 943,500 predicted in SWMM. During construction, the measured value was 1,574,000 kg/yr compared to 2,708,000 kg/yr predicted in AGNPS and 1,832,500 kg/yr predicted in SWMM. During operation, the concentrations returned to the level observed prior to construction. PCSWMM and AGNPS accurately predicted sediment yield increases during the construction of this golf course.