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许昌市区地处平原,穿过市区较大的河流清泥河,属季节性河流,平时河道干涸,只有在汛期河道上游有较大降雨时,河道内才会有汇流。距许昌市区30余公里的北汝河是一条大型河道,平均每年有8.9亿m~3的水流过,但这些河水大都集中在每年的6～9月份,是上游降雨后所形成的洪水。此时正是市区用水高峰,市区内的护城河、清泥河、运粮河等水体往往由于水面蒸发、入渗等原因,使得水量减少,水质变坏,影响了市区的环境。
Xuchang urban area is located in the plains, through the larger river Qingnihe River, is a seasonal river, usually dry up the river, only in the upper reaches of the flood season have greater rainfall, the river will have confluence. The North Ru River, which is 30 kilometers away from downtown Xuchang, is a large river with an average of 890 million cubic meters of water per year. However, most of these rivers are concentrated in June and September each year, and are floods formed after the upper reaches of the river. At this moment, it is the peak of urban water supply. The moat, Qingnian River and Yun’e River in the urban area often cause the decrease of water quantity and the deterioration of water quality due to the water surface evaporation and infiltration, which affects the urban environment.