Evaluating the Accuracy of Common Runoff Estimation Methods for New Impervious Hot-Mix Asphalt

Abstract

AbstractAccurately predicting runoff volume from impervious surfaces for water quality design events is an important step to meet water quality and infiltration design targets for green infrastructure stormwater control measures. The objectives of this research were to quantify abstraction from a recently paved impervious hot-mix asphalt (HMA) parking lot surface and evaluate the accuracy in modeling runoff volume from small events using the following runoff estimation methods: the Soil Conservation Service Curve Number (SCS-CN) method, the Simple Method (SM), and the Small Storm Hydrology Method (SSHM). A 4,000 m2 (0.4-ha) parking lot in Edison, New Jersey, was designed with impervious HMA driving lanes evenly draining onto parking lanes constructed with permeable pavement. Ten lined permeable pavement sections that capture all infiltrating water and route it to collection tanks were included in this study. Using a water balance approach on an event basis, the measured infiltrate volume was compared to ...