| In this study, the runoff characteristics of initial rainwater in a typical hilly city Xiang Xi Mei Lin Beibei district of Chongqin was analyzed by monitoring the samples from roof and road, brick, greenbelt, and the existing data. Results showed that in Beibei district of Chongqing from 2016 to 2017, the days of light rain accounted for 80.4 % of total rainfall days, torrential rain days accounted for only 1.3 %, the average rainfall was 9 mm, the average rainfall intensity was 9.75 mm/h, the rainfall duration was mainly medium or short( 1 to 6 hours) with single peaked feature. The surface runoff varied rapidly in initial rainwater and remained stable in the mid to late period. When the rainfall intensity was the same, the runoff in roof and road was the largest, while the least in greenbelt. The formation time of initial runoff prolonged in the order of roof and road, brick, greenbelt, and shortened with the increase of rainfall intensity. |
