time area concentration diagram

The tasks of the design calculation of rainwater catchment system for life purposes are determining the optimum rate area of rainwater catching field and the first rate volume of water cellar, which are the minimum area of rainwater catching field and the minimum volume of water cellar which can meet the needs of supplying life with water.

生活用雨水集流系统设计计算的任务 ,就是确定最优的集流场面积和贮水窖容积 ,即满足生活供水需求的集流场面积和贮水窖容积的最小值。