ZI Qiang,YIN Le,YANG Zhong-tao,et al.Study on Theoretical Runoff Control Ability of Sponge Site Designed According to Volume Method[J].China Water & Wastewater,2020,36(16 16):24-29.
Study on Theoretical Runoff Control Ability of Sponge Site Designed According to Volume Method
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
16 16
Page:
24-29
Column:
Date of publication:
2020-08-17
- Keywords:
- sponge city; volume method; theoretical volume capture ratio of annual rainfall; excess background control rainfall
- Abstract:
- The definition of volume capture ratio of annual rainfall in the Technical Guide of Sponge City Construction—Low Impact Development Stormwater System Construction(Trial) was formulated. It was found that there was a deviation between the theoretical volume capture ratio of annual rainfall and the target volume capture ratio of annual rainfall in the case of setting the target volume capture ratio of annual rainfall when using the volume method to determine the LID facility sizes. The study results showed that the factors influencing the comprehensive runoff coefficient of each rainfall also affected the deviation value. The deviation value was always negative, that is, the LID facility designed by volume method had a certain degree of safety margin because the excess background control rainfall was ignored. Taking the rainfall series of Guangzhou City as an example, the theoretical volume capture ratio of annual rainfall in sponge sites designed by the volume method under different runoff coefficients and target volume capture ratio of annual rainfall was calculated. Case analysis results showed that the theoretical volume capture ratio of annual rainfall was always greater than the target volume capture ratio of annual rainfall, and the relative deviation was within the acceptable range. However, it should be noted that due to larger runoff coefficient in the old urban area with high building density, the safety margin of the sponge facilities designed by the volume method was small.
Last Update:
2020-08-17