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University of Guelph (2000)

Hydrologic modelling of the Mfuli watershed in Zululand, South Africa

Brown, Laura Jayne

Titre : Hydrologic modelling of the Mfuli watershed in Zululand, South Africa

Auteur : Brown, Laura Jayne

Université de soutenance : University of Guelph

Grade : Master of Science (MS) 2000

Résumé
Two deterministic watershed hydrologic models are applied to the Mfuli subcatchment in KwaZulu-Natal, South Africa, a region characterized by semiarid conditions, limited accessibility and sparse data. The Hydrological Model Application System (HYMAS), a model designed for application in Southern Africa proved unusable because parameters were inadequately defined and there was insufficient source data to meet the many parameter requirements. The Runoff module in the Storm Water Management Model (SWMM) was selected as an alternative because it has ample documentation and can be modified to accommodate the available data. SWMM proved sensitive to the parameter defining the percent catchment area that was impervious and directly connected to the channel. The thin local soils required higher values of percent imperviousness than would otherwise be expected for a rural area. Eight of the twelve storm events have a computed output between +/-50% of the observed stormflow volume and the remaining four storms were overestimated by 209% to 416%. Uncertainty analysis showed that the Mfuli region requires more raingauge and streamflow data for reliable model usage and assessment.

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