Study on Hydrological Calculation Model of Flood Control in the Middle and Lower Reaches of the Chuhe River under the Background of Urbanization

The traditional method of hydrology and water conservancy calculation is based on the assumption natural runoff, while applicability has weakened in urbanization-affected river basins. paper carried out research hydrological model flood control middle lower reaches Chuhe River under background urbanization. On basis analysis characteristics basins, framework constructed, which includes five modules: design rainstorm calculation, runoff regional flow concentration river-network confluence lake-reservoir regulation calculation. parameters generation, overland concentration, hilly area are determined. Process simulation levels discharges 1991 2008, years with heavy rains, conducted. June shows that error level -1cm ~ + 8cm, discharge +26 m 3 /s. August 2008 -8cm 2cm, -9 overall results relatively stable all errors within allowable range, fit facts well.