Hydrological impacts evaluation of pervious pavement based on a storm water management model

Hydrological performances of pervious pavement were examined at a site within Little Mill Creek watershed in Lenexa, Kansas, USA using three hydrological indicators of peak flow rate, total runoff volume and runoff coefficient based on the 2-yr, 10-yr and 100-yr design rainfall events and a continuous ten year hourly rainfall record. Three scenarios of undeveloped, developed with no runoff control and developed with pervious pavement controlled were introduced to represent how much pervious pavement can mitigate development impacts and replicate undeveloped condition. Environmental Protection Agency (EPA) Stormwater Management Model (SWMM) was used to simulate the three scenarios due to its advantage in representing different land use scenarios. Results showed that pervious pavements offer significant stormwater management and peak flow rate, total runoff volume and runoff coefficient are even smaller than those of undeveloped condition. It´s deduced that pervious pavement has great potential in replicating the undeveloped runoff through appropriate size and design.