Abstract
A 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 further calibrated to determine the best-fitted values for soil initial moisture content and hydraulic conductivity involved in the flow simulations. This calibrated model is a useful tool to understand the clogging situation in the rain garden and also helps the engineer make operational decisions on drain time and flow releases from the rain garden.
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Published In
Journal of Hydrologic Engineering
Volume 20 • Issue 9 • September 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 9, 2013
Accepted: Dec 1, 2014
Published online: Jan 8, 2015
Discussion open until: Jun 8, 2015
Published in print: Sep 1, 2015
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