United States Department of Transportation
i
Guidance for Estimation of Time of Concentration in Texas for Low-Slope Conditions
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2012-07-01
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[PDF-1.57 MB]
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Abstract:Formal guidance for estimation of time of concentration (critical storm duration) for watersheds characterized as having limited topographic slope is provided in this product. Limited topographic slope watersheds are those watersheds having main-channel slopes less than about 0.3 percent or 0.003 dimensionless. Cleveland and others (2011) explains that this choice of threshold slope is intended to provide a smooth transition from typical to low slope conditions. Main-channel slope S(0) is computed as the change in elevation from the watershed divide to the watershed outlet divided by the curvilinear distance of the main channel (primary flow path) between the watershed divide and the outlet (Roussel and others, 2005). The authors emphasize that there is ambiguity in the meaning of low slope watersheds and the primary objective of this project is for objective mitigation for conditions in which the engineer computes S(0) → 0 (slope effectively vanishing). The guidance described in this product is an adaptation and extension of the supplement in Roussel and others (2005, pp. 33–34). That supplement is extended here to watersheds with limited topographic slope. Such watersheds are predominant in the High Plains and Coastal Regions of Texas.
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