关键词: 纳污能力分析, 设计水文条件, 水量平衡原理, 小型城市湖泊

Abstract: Due to lacking of long series of hydrological observation data, the designed hydrological conditions are important factors restricting the check accounting of water environment capacity of small urban lakes. In this paper, based on the rainfall runoff coefficient method and the principle of water balance, taking North Lake in Jianghan District, Wuhan City, the designed hydrological conditions are determined and the allowable permitted assimilative capacity of small urban lake is calculated. The results show that the water environment capacity of COD, TP and NH3-N of North Lake are 11.26 t/a, 0.063 t/a and 0.92 t/a, respectively. The amount of COD, TP and NH3-N entering the lake are 6.94, 0.035 and 0.35 t/a, respectively, which are less than the corresponding allowable permitted assimilative capacity. These results are consistent with the water quality of the lake, indicating that the method presented in this paper to determined hydrological conditions can be used for accounting the water environment capacity of small urban lakes.

Key words: water environment capacity, designed hydrological conditions, principle of water balance, small urban lake