ABSTRACT
Onsite disposal of storm runoff is the best policy to reduce the increased runoff volumes through soil infiltrations. An infiltration bed is often constructed as part of the landscaping and is then blended into a vegetation area. An infiltration basin is designed to remove pollutants from a tributary area up to 5–10 acres. For water quality enhancement, an infiltration basin shall be designed for the frequent storm events. The primary factors affecting soil infiltration are soil type, antecedent soil moisture (AMC), vegetative cover, and the soil surface texture such as crusted or frozen. After the soil media become saturated, the infiltrating water directly recharges the groundwater table. If the seepage flow through the soil column is slower than the infiltration rate on the land surface, the excess inflow will cause water mounting effect. The flow pattern of a seepage flow through soil medium can be depicted by the potential flow using the stream function.
