Guidance for Estimation of Time of Concentration in Texas for Low-Slope Conditions

Cleveland, Theodore G.; Thompson, David B.; Fang, Xing; Li, Ming-Han

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Guidance for Estimation of Time of Concentration in Texas for Low-Slope Conditions

2012-07-01
By Cleveland, Theodore G. ; Thompson, David B. ; Fang, Xing

File Language:

English

Details

Creators:

Cleveland, Theodore G. ; Thompson, David B. ; Fang, Xing ; Li, Ming-Han
Corporate Creators:

Texas Tech University. Center for Multidisciplinary Research in Transportation
Corporate Contributors:

Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
Subject/TRT Terms:
- Estimating
- Guidelines
- Hydrology
- Runoff
- Slopes
- Time duration
- Watersheds
Publication/ Report Number:

0-6382-P1
Resource Type:

Tech Report
Geographical Coverage:

Texas ; United States
Corporate Publisher:

Texas Tech University. Center for Multidisciplinary Research in Transportation
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.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/66537/dot_66537_DS1.pdf
File Type:

[PDF - 1.57 MB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha256:b14ecdbab50322858c9404f57190cfa83c0198f90f55f66d0b634ac3e3d26d9e

File Language:

English

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