Downstream Hydrographic Effects of Urban Stormwater Detention and Infiltration
Ferguson, Bruce K.
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Urban stormwater hydrographs with various degrees of detention and infiltration were routed through 30 hypothetical drainage networks. Only infiltration reduced flow volume. Infiltration shortened flow duration while detention lengthened it. Both detention and infiltration reduced peak rate of flow, but not to the degree for which they were designed; their effectiveness varied with drainage networks and urban hydrologic changes. These results encourage balanced consideration of infiltration and detention for solving specific problems of flooding and erosion in specific watersheds.