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Effects of urbanization on watershed hydrology: The scaling of discharge with drainage area

¹ Department of Earth and Environmental Sciences, Lehigh University, 31 Williams, Bethlehem, Pennsylvania 18015, USA
² Department of Civil and Environmental Engineering, Lehigh University, 19 Memorial Drive West, Bethlehem, Pennsylvania 18015, USA

This study examines the effects of impervious surfaces within urbanized land on the scaling of river discharge with drainage area. Discharge in a river channel grows as drainage basin area increases following the general equation Q = kA^c, where Q is river discharge, k is a measure of river base flow, A is upstream drainage area, and c is the scaling power dependency. Land use is a critical variable in the examination of river discharge; discharge has significant geologic and ecologic influences on fluvial systems. Discharge is assumed to scale linearly or nearly linearly with drainage area (c 1), but in spite of its widespread application, the relationship has not been explicitly tested with respect to urbanization. Here we show that in small urban settings the scaling is nonlinear for peak flows. It is proposed that effective water loading occurs through a combination of increased runoff and an increase in the rate of transport to the rivers. These higher discharges in urban rivers have the potential to increase erosion, degrade aquatic habitats, and significantly alter channel forms.

Key Words: discharge • drainage area • land use • watershed • urbanization

This article has been cited by other articles:

				J. C. Galster Natural and anthropogenic influences on the scaling of discharge with drainage area for multiple watersheds Geosphere, August 1, 2007; 3(4): 260 - 271. [Abstract] [Full Text] [PDF]