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Excess Stormwater Quantification in Ungauged Watersheds Using an Event-Based Modified NRCS Model

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Abstract

Quantifying runoff from a storm event is a crucial part of rainfall-runoff model development. The objective of this study is to illustrate inconsistencies in the initial abstraction (I a) and curve number (CN) in the Natural Resources Conservation Service (NRCS) model for ungauged steep slope watersheds. Five alternatives to the NRCS model were employed to estimate stormwater runoff in 39 forest-dominated mountainous watersheds. The change to the parameterization (slope-adjusted CN and I a) leads to more efficient modified NRCS models. The model evaluations based on root mean square error (RMSE), Nash-Sutcliffe coefficient E, coefficient of determination (R 2), and percent bias (PB) indicated that our proposed model with modified I a, consistently performed better than the other four models and the original NRCS model, in reproducing the runoff. In addition to the quantitative statistical accuracy measures, the proposed I a modification in the NRCS model showed very encouraging results in the scatter plots of the combined 1799 storm events, compared to other alternatives. This study’s findings support modifications to the CN and the I a in the NRCS model for steep slope ungauged watersheds and suggest additional changes for more accurate runoff estimations.

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Acknowledgments

This research was supported by a grant from the Construction Technology Innovation Program (11CTIPC06-Development of Korean Advanced Technology for Hydrologic Analysis) funded by the Ministry of Land, Infrastructure, and Transport (MLIT) of Korea. Special thanks to the Hydrological Survey Center (HSC) of Korea for providing measured data of streamflow.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, Hanyang University, Seoul, 04763, Republic of Korea

    Muhammad Ajmal

  2. Department of Agricultural Engineering, University of Engineering and Technology, Peshawar, 25120, Pakistan

    Muhammad Ajmal

  3. Department of Civil Engineering, Seokyeong University, Seoul, 02713, Republic of Korea

    Jae-Hyun Ahn

  4. Department of Civil and Environmental Engineering, Hanyang University, Ansan, 15588, Republic of Korea

    Tae-Woong Kim

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  1. Muhammad Ajmal
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  2. Jae-Hyun Ahn
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Correspondence to Tae-Woong Kim.

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Ajmal, M., Ahn, JH. & Kim, TW. Excess Stormwater Quantification in Ungauged Watersheds Using an Event-Based Modified NRCS Model. Water Resour Manage 30, 1433–1448 (2016). https://doi.org/10.1007/s11269-016-1231-z

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  • DOI: https://doi.org/10.1007/s11269-016-1231-z

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