Estimating time of concentration on low-slope planes using diffusion hydrodynamic model

K. C. Manoj, Xing Fang, Young Jae Yi, Ming Han Li, Theodore G. Cleveland, David B. Thompson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The time of concentration (T c) is an important parameter for hydrologic design, analysis, and modeling. Error in the estimation of T c will cause error in prediction of peak discharge (Q p), resulting in an incorrect design. Overland flow T c depends on several factors, such as rainfall intensity (i), length (L), topographic slope (S 0), and flow resistance (n). Generally, T c has an inverse relation to S 0. For the areas with very small or zero S 0, use of such small values for S 0 in traditional methods (empirical equations) for estimating T c can produce very large values of T c that seem to be unrealistic and incorrect. This study was conducted to identify a lower slope bound (SLB) for the use of traditional equations in determination of T c and to propose the use of an alternate method for the determination of T c on low-slope planes. The diffusion hydrodynamic model (DHM) was validated using data collected from published studies and field data collected in this study, including observed rainfall hyetographs and runoff hydrographs for 27 rainfall events for watersheds with relatively low-slope. After model validation, DHM was used to generate parametric relations between T c and its explanatory variables (rainfall intensity, length, slope and resistance to flow) and extend the regression model to low-slope planes.

Original languageEnglish
Title of host publicationWorld Environmental and Water Resources Congress 2012
Subtitle of host publicationCrossing Boundaries, Proceedings of the 2012 Congress
Pages360-371
Number of pages12
DOIs
StatePublished - 2012
EventWorld Environmental and Water Resources Congress 2012: Crossing Boundaries - Albuquerque, NM, United States
Duration: May 20 2012May 24 2012

Publication series

NameWorld Environmental and Water Resources Congress 2012: Crossing Boundaries, Proceedings of the 2012 Congress

Conference

ConferenceWorld Environmental and Water Resources Congress 2012: Crossing Boundaries
CountryUnited States
CityAlbuquerque, NM
Period05/20/1205/24/12

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    Manoj, K. C., Fang, X., Yi, Y. J., Li, M. H., Cleveland, T. G., & Thompson, D. B. (2012). Estimating time of concentration on low-slope planes using diffusion hydrodynamic model. In World Environmental and Water Resources Congress 2012: Crossing Boundaries, Proceedings of the 2012 Congress (pp. 360-371). (World Environmental and Water Resources Congress 2012: Crossing Boundaries, Proceedings of the 2012 Congress). https://doi.org/10.1061/9780784412312.039