A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration

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Abstract

In semi‐arid regions, small artificial surface reservoirs are important to meet the domestic and agricultural water requirements of smallholder farmers. The research objective of the study was to determine the rainfall‐runoff relation of two ungauged rivers using the measured water levels of the downstream reservoir. The study areas are the catchments of the upper Mnyabezi River (22 km2) and upper Bengu River (8 km2), which are tributaries of the Thuli River in southern Zimbabwe. The rainfallrunoff relationship is established with the SCS‐Method. The catchments were each divided into subareas by Thiessen‐polygons. For each polygon the amount of discharge was calculated based on the precipitation, land use, land treatment, antecedent moisture conditions and hydrological soil group. The summation of the calculated runoff per polygon formed the inflow variable for the reservoir models. The collected daily water level data from the period March ‐May 2007 were used to calibrate the rainfallrunoff model. The calibration process of the rainfall‐runoff model resulted in an initial abstraction of 7.6 % of the actual retention. It is concluded that the SCS‐method is a useful tool to simulate the rainfallrunoff relation of small ungauged catchments
Original languageUndefined
Title of host publicationProceeedings 8th WaterNet/WARSFA/GWP-SA Symposium, 31 October - 2 November 2007, Lusaka, Zambia ( CD-ROM)
Place of PublicationHarare, Zimbabwe
PublisherWaternet
Pages-
Number of pages8
Publication statusPublished - 31 Oct 2007

Keywords

  • IR-61523
  • METIS-242775

Cite this

de Hamer, W., Love, D., Booij, M. J., & Hoekstra, A. Y. (2007). A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration. In Proceeedings 8th WaterNet/WARSFA/GWP-SA Symposium, 31 October - 2 November 2007, Lusaka, Zambia ( CD-ROM) (pp. -). Harare, Zimbabwe: Waternet.
de Hamer, W. ; Love, D. ; Booij, Martijn J. ; Hoekstra, Arjen Ysbert. / A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration. Proceeedings 8th WaterNet/WARSFA/GWP-SA Symposium, 31 October - 2 November 2007, Lusaka, Zambia ( CD-ROM). Harare, Zimbabwe : Waternet, 2007. pp. -
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title = "A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration",
abstract = "In semi‐arid regions, small artificial surface reservoirs are important to meet the domestic and agricultural water requirements of smallholder farmers. The research objective of the study was to determine the rainfall‐runoff relation of two ungauged rivers using the measured water levels of the downstream reservoir. The study areas are the catchments of the upper Mnyabezi River (22 km2) and upper Bengu River (8 km2), which are tributaries of the Thuli River in southern Zimbabwe. The rainfallrunoff relationship is established with the SCS‐Method. The catchments were each divided into subareas by Thiessen‐polygons. For each polygon the amount of discharge was calculated based on the precipitation, land use, land treatment, antecedent moisture conditions and hydrological soil group. The summation of the calculated runoff per polygon formed the inflow variable for the reservoir models. The collected daily water level data from the period March ‐May 2007 were used to calibrate the rainfallrunoff model. The calibration process of the rainfall‐runoff model resulted in an initial abstraction of 7.6 {\%} of the actual retention. It is concluded that the SCS‐method is a useful tool to simulate the rainfallrunoff relation of small ungauged catchments",
keywords = "IR-61523, METIS-242775",
author = "{de Hamer}, W. and D. Love and Booij, {Martijn J.} and Hoekstra, {Arjen Ysbert}",
year = "2007",
month = "10",
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de Hamer, W, Love, D, Booij, MJ & Hoekstra, AY 2007, A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration. in Proceeedings 8th WaterNet/WARSFA/GWP-SA Symposium, 31 October - 2 November 2007, Lusaka, Zambia ( CD-ROM). Waternet, Harare, Zimbabwe, pp. -.

A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration. / de Hamer, W.; Love, D.; Booij, Martijn J.; Hoekstra, Arjen Ysbert.

Proceeedings 8th WaterNet/WARSFA/GWP-SA Symposium, 31 October - 2 November 2007, Lusaka, Zambia ( CD-ROM). Harare, Zimbabwe : Waternet, 2007. p. -.

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

TY - GEN

T1 - A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration

AU - de Hamer, W.

AU - Love, D.

AU - Booij, Martijn J.

AU - Hoekstra, Arjen Ysbert

PY - 2007/10/31

Y1 - 2007/10/31

N2 - In semi‐arid regions, small artificial surface reservoirs are important to meet the domestic and agricultural water requirements of smallholder farmers. The research objective of the study was to determine the rainfall‐runoff relation of two ungauged rivers using the measured water levels of the downstream reservoir. The study areas are the catchments of the upper Mnyabezi River (22 km2) and upper Bengu River (8 km2), which are tributaries of the Thuli River in southern Zimbabwe. The rainfallrunoff relationship is established with the SCS‐Method. The catchments were each divided into subareas by Thiessen‐polygons. For each polygon the amount of discharge was calculated based on the precipitation, land use, land treatment, antecedent moisture conditions and hydrological soil group. The summation of the calculated runoff per polygon formed the inflow variable for the reservoir models. The collected daily water level data from the period March ‐May 2007 were used to calibrate the rainfallrunoff model. The calibration process of the rainfall‐runoff model resulted in an initial abstraction of 7.6 % of the actual retention. It is concluded that the SCS‐method is a useful tool to simulate the rainfallrunoff relation of small ungauged catchments

AB - In semi‐arid regions, small artificial surface reservoirs are important to meet the domestic and agricultural water requirements of smallholder farmers. The research objective of the study was to determine the rainfall‐runoff relation of two ungauged rivers using the measured water levels of the downstream reservoir. The study areas are the catchments of the upper Mnyabezi River (22 km2) and upper Bengu River (8 km2), which are tributaries of the Thuli River in southern Zimbabwe. The rainfallrunoff relationship is established with the SCS‐Method. The catchments were each divided into subareas by Thiessen‐polygons. For each polygon the amount of discharge was calculated based on the precipitation, land use, land treatment, antecedent moisture conditions and hydrological soil group. The summation of the calculated runoff per polygon formed the inflow variable for the reservoir models. The collected daily water level data from the period March ‐May 2007 were used to calibrate the rainfallrunoff model. The calibration process of the rainfall‐runoff model resulted in an initial abstraction of 7.6 % of the actual retention. It is concluded that the SCS‐method is a useful tool to simulate the rainfallrunoff relation of small ungauged catchments

KW - IR-61523

KW - METIS-242775

M3 - Conference contribution

SP - -

BT - Proceeedings 8th WaterNet/WARSFA/GWP-SA Symposium, 31 October - 2 November 2007, Lusaka, Zambia ( CD-ROM)

PB - Waternet

CY - Harare, Zimbabwe

ER -

de Hamer W, Love D, Booij MJ, Hoekstra AY. A rainfall-runoff model for two small ungauged catchment using the water balance of a reservoir for calibration. In Proceeedings 8th WaterNet/WARSFA/GWP-SA Symposium, 31 October - 2 November 2007, Lusaka, Zambia ( CD-ROM). Harare, Zimbabwe: Waternet. 2007. p. -