Storm Drain Effects on Urban Flooding
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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Urban flooding is a primary concern in all developed areas. Understanding what factors contribute to the magnitude and frequency of flooding is of primary importance when designing an engineering system to mitigate flooding. To understand the effect of impervious area versus the role of the storm drainage system in urban flooding, the U.S. Army Corps of Engineers Gridded Surface Subsurface Hydrologic Analysis model was enhanced with a subsurface drainage model. The subsurface drainage model is described and an example application in Maryland of an urban area demonstrated that the storm drainage system plays a major role in the hydrologic response of a watershed to moderate-to-high rainfall events. Due to the under-capacity of the storm drainage system, however, the effect of the storm drainage network for extreme rainfall events is greatly diminished.
- Hydrology, Limnology and Potamology