Water Resources and Power

In order to explore the solution to the risk of ponding and waterlogging in the sub-catchment area during sponge city design, SWMM modeling was used to study the peak runoff control characteristics of LID facilities and their combinations under different recurrence interval, as well as the peak runoff control laws of the incremental scale of volumetric LID facilities. The study shows that the peak runoff control effect of volumetric LID facilities is mainly achieved through peak time delay, while the peak runoff control effect of permeable LID facilities is mainly achieved through overall runoff reduction, and the peak runoff control effect of volumetric LID facilities is more significant; Only the combination of permeable LID facilities cannot significantly reduce peak runoff and delay peak time on a rainfall event with a recurrence interval of 5 years or more. When combined with volumetric LID facilities, it can achieve a peak runoff reduction rate of over 20% for rainfall with a recurrence interval of less than 10 years; When the scale of permeable LID facilities increases by 60% or more, the peak runoff reduction effect is more obvious for rainfall with a recurrence interval of 50 years or less; When its scale increases by 80% or more, it can basically ensure that the total runoff volume of post-development does not exceed which of pre-development with a recurrence interval of 50 years or less. The research results are aimed at exploring solutions to the risk of ponding and waterlogging in local areas, which provides theoretical reference for the design of peak runoff control in actual sponge city sub-catchments.