Comparison of Stormwater Pipe Network between LID Mode and Traditional Mode Based on HYSWMM
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
11
Page:
117-122
Column:
Date of publication:
2020-06-05
- Abstract:
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Operation of stormwater pipe network in low impact development (LID) mode in northern area of Guangming District, Shenzhen at different rainfall conditions was simulated by using HYSWMM, and the influence of LID on the operation of stormwater pipe network was analyzed from the aspects of runoff coefficient, drainage capacity of pipe network, depth ratio, node water depth, runoff peak and peak time. For 2 hours shortduration rainfall with a return period less than 10 years, the addition of LID facilities could reduce stormwater runoff.Compared with traditional mode, regional runoff coefficient decreased from 0.53-0.67 to 0.42-0.56, drainage capacity increased by about 10%, the peak discharge of pipe network outlet decreased by 9.9%-15.9%, the maximum water depth of the node decreased by 0.09-0.5 m, the depth ratio decreased by 0.22 at most, and the peak time was prolonged by 3 minutes. For the 24 hours long-duration rainfall with a return period of 50 years, the peak discharge of pipe network outlet in LID mode was almost unchanged compared with that in the traditional mode, and the influence of LID mode on the operation of stormwater pipe network in extreme storm was weak.
Last Update:
2020-06-01