Abstract
AbstractA rain garden is a typical stormwater infiltrating facility designed for on-site water-quality enhancement. A rain garden consists of a surface storage basin and subsurface infiltrating media. The storage basin is designed to be shallow, flat, and wide with an overtopping weir to pass excess flows, while the subsurface infiltrating system is composed of two layers of filtering media. The upper layer is filled with sand mix, and the lower layer is formed with gravels. In this study, the storage basin is sized to capture the water quality capture volume (WQCV) that is determined using the lognormal distribution to describe the population of rainfall event depths. The subsurface filtering layers are sized to achieve the targeted flow release and drain time. A surface–subsurface hydrologic model is developed in this study to simulate the water-loading process in the storage basin and also the infiltrating process through the sand-mix layer. Based on field tests and data, this hydrologic model is furth...
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