Design and Calculation of Rainwater Drainage System with Storage Pond

The setting of storage pond is an effective method for urban rainwater utilization.But there are no methods of design and calculation for rainwater drainage system with storage pond.According to the reasoning of rainwater pipeline design and the theory of void volume filling,a reasonable assumption that all of rainwater from the upper pipeline inflow the storage pond continually to prolong the conflux time t3 of the lower pipeline is proposed.So calculation of the lower pipeline's rainfall duration should include the ground catchment time t1,flowing time with the reduction factor mt2 and the filling time t3 in which the storage pond is filled with the designed discharge from the upper pipeline.Thus,the design formula suitable for rainwater drainage system with storage pond is obtained and applied to pipeline design of the rainwater utilization system in a technology park planned in the Northwest of China.Compared with other traditional design methods,the design and calculation of rainwater drainage system with storage pond can improve the rainwater storage capacity of rainwater drainage system and reduce the project cost.