Study on the water environment capacity for the typical watershed in Taizihe River

Based on the result of analyzing the water quality, the pollution resource and the pollution feature of Taizihe River, the 1-D water quality model was utilized in the water environmental capacity simulation calculation of Taizihe River. The water environmental capacity of the major pollution COD has been imitatively calculated under different guarantee rate (90%, 50%, 25%), with the foundation of the functional zoning and the hydrological monitoring data from all the water quality and hydrological stations at each section of Taizihe River. The result is showed that the allowable emission amount of COD from 09-C~09-I is 345375.78kg/d, 503221.54kg/d, and 593034.76kg/d respectively in the dry, average and wet year. The study has discovered that the water environmental capacity and the water quality could be advanced by the optimal operation of water quality and quantity in reservoirs and dams of Taizihe river basin.