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A Strategy for Managing Deficiencies of SWMM Modeling for Large Undeveloped Semi-Arid Watersheds

Hanlie Pretorius, William James and Julian Smit (2013)
University of Cape Town; University of Guelph
DOI: https://doi.org/10.14796/JWMM.R246-01
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Abstract

The aim of the major study was to determine if sufficient data at no charge is available on the Internet to use as input to a free and open source hydrological model for use in a streamflow monitoring system. The study area is the C83A quaternary catchment (746 km2) in the Northern Free State, part of the Vaal primary catchment in South Africa. The catchment has a response time of approximately 13 hours and so sub daily calculation steps were required in the hydrological model. The data that were available on the Internet to use as input to a hydrological model were: catchment boundaries, river lines, a digital elevation model, soil texture, land use, evaporation rates, flow rates and rainfall estimates from the Tropical Rainfall Measurement Mission (TRMM) 3B42 data product. After determining the requirements for the model and evaluating a number of models, the USEPA Storm Water Management Model (SWMM) was chosen. Only two years of observed rain and runoff were suitable for analysis. The coarseness of the available input data necessitated a coarser model than is the norm for SWMM. Nevertheless, the calibrated model performed well overall, having Nash-Sutcliffe (N-S) correlations of 0.80 and 0.73 for the calibration and evaluation periods respectively. The derived model-and-data system, denoted UCTPCSWMMC83A.1, is assessed in terms of the accuracy achievable by a public-domain area-wide streamflow model semi-automatically built from data readily downloaded from the Internet.

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PAPER INFO

Identification

CHI ref #: R246-01 688
Volume: 21
DOI: https://doi.org/10.14796/JWMM.R246-01
Cite as: CHI JWMM 2013;R246-01

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2013

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# reviewers: 2
Version: Final published

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© 2013 CHI. Some rights reserved.

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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

The Journal of Water Management Modeling is an open-access (OA) publication. Open access means that articles and papers are available without barriers to all who could benefit from them. Practically speaking, all published works will be available to a worldwide audience, free, immediately on publication. As such, JWMM can be considered a Diamond, Gratis OA journal.

All papers published in the JWMM are licensed under a Creative Commons Attribution 4.0 International License (CC BY).

JWMM content can be downloaded, printed, copied, distributed, and linked-to, when providing full attribution to both the author/s and JWMM.


AUTHORS

Hanlie Pretorius

University of Cape Town, Cape Town, Western Cape, South Africa
ORCiD:

William James

University of Guelph, Guelph, ON, Canada
ORCiD:

Julian Smit

University of Cape Town, Cape Town, Western Cape, South Africa
ORCiD:


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