Journal of Engineering Research

In sponge city construction, runoff reduction measures can effectively reduce runoff volume and runoff pollution, and play a role of peak mitigation for urban stormwater discharge. In this paper, the reduction ratio of runoff reduction measures to stormwater discharge is calculated using empirical formulae and SWMM model to assist verification in semi-arid cities in the north as an example. The calculation shows that the reduction ratio of source emission reduction measures for stormwater discharge is different under different rainfall scenarios in different recurrence periods. At a volume capture ratio of annual rainfall of 85%, the reduction percentages of stormwater flow under the 1-year, 2-year, 3-year, 5-year, and 10-year return period rainfall scenarios were 82% to 83.8%, 63.5% to 65.6%, 56.2% to 58.3%, 49.2% to 51.1%, and 41.4% to 43.9%, respectively. The reduction ratios of runoff reduction for municipal stormwater discharges developed in this study can provide a reference for the optimization of stormwater discharge schemes in semi-arid cities in the north, and the use of economic, reasonable, and efficient retrofit measures in urban planning and design.

Sponge city; Municipal water supply and drainage; Drainage and waterlogging prevention; EPA SWMM model