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Improved Time of Concentration Estimation on Overland Flow Surfaces Including Low-Sloped Planes

KC, Manoj / Fang, Xing / Yi, Young-Jae / Li, Ming-Han / Thompson, David B. / Cleveland, Theodore G.

Time of concentration ( $T_{c}$ ) is one of the most used time parameters in hydrologic analyses. As topographic slope ( $S_{o}$ ) approaches zero, traditional $T_{c}$ estimation formulas predict large $T_{c}$ . Based on numerical modeling and a review of relevant literature, a lower bound for slope ( $S_{l b}$ ) of 0.1% was identified as a threshold below which traditional $T_{c}$ estimation formulas become unreliable and alternate methods should be considered. In this study, slopes less than $S_{l b}$ are defined as low slopes. Slopes equal to or exceeding $S_{l b}$ are defined as standard slopes where traditional $T_{c}$ estimation formulas are appropriate. A field study was conducted on a concrete plot with a topographic slope of 0.25% to collect rainfall and runoff data between April 2009 and March 2010 to support numerical modeling of overland flows on low-sloped planes. A quasi-two-dimensional dynamic wave model (Q2DWM) was developed for overland flow simulation and validated using published and observed data. The validated Q2DWM was used in a parametric study to generate $T_{c}$ data for a range of slopes that were used to develop $T_{c}$ regression formulas for standard slopes ( $S_{o} \geq 0.1 %$ ) and low slopes ( $S_{o} < 0.1 %$ ).

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Improved Time of Concentration Estimation on Overland Flow Surfaces Including Low-Sloped Planes

KC, Manoj / Fang, Xing / Yi, Young-Jae / Li, Ming-Han / Thompson, David B. / Cleveland, Theodore G.

Time of concentration ( $T_{c}$ ) is one of the most used time parameters in hydrologic analyses. As topographic slope ( $S_{o}$ ) approaches zero, traditional $T_{c}$ estimation formulas predict large $T_{c}$ . Based on numerical modeling and a review of relevant literature, a lower bound for slope ( $S_{l b}$ ) of 0.1% was identified as a threshold below which traditional $T_{c}$ estimation formulas become unreliable and alternate methods should be considered. In this study, slopes less than $S_{l b}$ are defined as low slopes. Slopes equal to or exceeding $S_{l b}$ are defined as standard slopes where traditional $T_{c}$ estimation formulas are appropriate. A field study was conducted on a concrete plot with a topographic slope of 0.25% to collect rainfall and runoff data between April 2009 and March 2010 to support numerical modeling of overland flows on low-sloped planes. A quasi-two-dimensional dynamic wave model (Q2DWM) was developed for overland flow simulation and validated using published and observed data. The validated Q2DWM was used in a parametric study to generate $T_{c}$ data for a range of slopes that were used to develop $T_{c}$ regression formulas for standard slopes ( $S_{o} \geq 0.1 %$ ) and low slopes ( $S_{o} < 0.1 %$ ).

Improved Time of Concentration Estimation on Overland Flow Surfaces Including Low-Sloped Planes

KC, Manoj / Fang, Xing / Yi, Young-Jae / Li, Ming-Han / Thompson, David B. / Cleveland, Theodore G.

Time of concentration ( $T_{c}$ ) is one of the most used time parameters in hydrologic analyses. As topographic slope ( $S_{o}$ ) approaches zero, traditional $T_{c}$ estimation formulas predict large $T_{c}$ . Based on numerical modeling and a review of relevant literature, a lower bound for slope ( $S_{l b}$ ) of 0.1% was identified as a threshold below which traditional $T_{c}$ estimation formulas become unreliable and alternate methods should be considered. In this study, slopes less than $S_{l b}$ are defined as low slopes. Slopes equal to or exceeding $S_{l b}$ are defined as standard slopes where traditional $T_{c}$ estimation formulas are appropriate. A field study was conducted on a concrete plot with a topographic slope of 0.25% to collect rainfall and runoff data between April 2009 and March 2010 to support numerical modeling of overland flows on low-sloped planes. A quasi-two-dimensional dynamic wave model (Q2DWM) was developed for overland flow simulation and validated using published and observed data. The validated Q2DWM was used in a parametric study to generate $T_{c}$ data for a range of slopes that were used to develop $T_{c}$ regression formulas for standard slopes ( $S_{o} \geq 0.1 %$ ) and low slopes ( $S_{o} < 0.1 %$ ).

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Titel:

Improved Time of Concentration Estimation on Overland Flow Surfaces Including Low-Sloped Planes

Beteiligte:

KC, Manoj (Autor:in) / Fang, Xing (Autor:in) / Yi, Young-Jae (Autor:in) / Li, Ming-Han (Autor:in) / Thompson, David B. (Autor:in) / Cleveland, Theodore G. (Autor:in)

Erschienen in:

Journal of Hydrologic Engineering ; 19 ; 495-508

Erscheinungsdatum:

12.04.2013

Format / Umfang:

142014-01-01 pages

ISSN:

1084-0699 , 1943-5584

DOI:

https://doi.org/10.1061/(ASCE)HE.1943-5584.0000830

Medientyp:

Aufsatz (Zeitschrift)

Format:

Elektronische Ressource

Sprache:

Unbekannt

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