Study on urban rainstorm pattern of short-duration double-peak

At present, researches on urban short-duration rainstorm patterns mainly focus single-peak patterns, and rarely involve double-peak or convert into directly, even ignore the impact of which directly affects flood planning early warning rescue. To scientifically rationally deduce rain pattern, this paper proposes a new function fitting pattern method by constructing virtual peak rainfall coefficient, based idea to single-peak, then revert double-peak, deducing pattern. The results show that (1) derived (FFRPM) can effectively improve accuracy is also more practical; (2) degree actual than 90%, accounting for 80%, main secondary with an average about 95%; positions relatively high; (3) Compared P&C method, whether overall local rainfall, FFRPM has higher accuracy, especially accurate rainfall.