Abstract：Urban roads are very important for draining excessive rainfall. A routing-enhanced detailed urban stormwater model (REDUS) is developed, and two main roads in the Tsinghua University campus are selected to evaluate how well the road system enhances drainage during typical storms and to quantify the impacts of rainfall type, road longitudinal slope and underground pipe systems. The results show that for the Beijing "721" stormwater event, the roads can drain as much as 50% of the total flooding discharge and the drainage increases dramatically when the pipe network reaches its maximun drainage capacity. The road drainage effectiveness is sensitive to the rainfall characteristics with the drainage correlating well with the maximum 30-min rainfall volume. Branch pipe networks do not continually increase the road drainage effectiveness as the road longitudinal slope increases which indicates that the road flows are closely connected to the flows in the underground pipes. The results will facilitate construction of Sponge City that effectively incorporates the road drainage.
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LYU Heng, NI Guangheng, CAO Xuejian, TIAN Fuqiang. Quantitative evaluation of the role of roads in urban drainage and its influencing factors. Journal of Tsinghua University(Science and Technology), 2018, 58(10): 906-913.
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