Methods and equations for estimating peak streamflow per square mile in Virginia’s urban basins

Scientific Investigations Report 2014-5090
Prepared in cooperation with the Virginia Department of Transportation
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Abstract

Models are presented that describe Virginia urban area annual peak streamflow per square mile based on basin percent urban area and basin drainage area. Equations are provided to estimate Virginia urban peak flow per square mile of basin drainage area in each of the following annual exceedance probability categories: 0.995, 0.99, 0.95, 0.9, 0.8, 0.67, 0.5, 0.43, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, and 0.002 (recurrence intervals of 1.005, 1.01, 1.05, 1.11, 1.25, 1.49, 2.0, 2.3, 5, 10, 25, 50, 100, 200, and 500 years, respectively). Equations apply to Virginia drainage basins ranging in size from no less than 1.2 mi2 to no more than 2,400 mi2 containing at least 10 percent urban area, and not more than 96 percent urban area. A total of 115 Virginia drainage basins were analyzed. Actual-by-predicted plots and leverage plots for response variables and explanatory variables in each peak-flow annual exceedance probability category indicate robust model fits and significant explanatory power. Equations for 8 of 15 urban peak-flow response surface models yield R-square values greater than 0.8. Relations identified in statistical models, describing significant increases in urban peak stream discharges as basin urban area increases, affirm empirical relations reported in past studies of change in stream discharge, lag times, and physical streamflow processes, most notably those detailed for urban areas in northern Virginia.

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Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Methods and equations for estimating peak streamflow per square mile in Virginia’s urban basins
Series title Scientific Investigations Report
Series number 2014-5090
DOI 10.3133/sir20145090
Year Published 2014
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Virginia Water Science Center
Description vii, 25 p.
Country United States
State Virginia
Datum North American Datum 1983
Projection Albers Equal Area projection
Online Only (Y/N) N