Estimation of Flow-Duration and Low-Flow Frequency Parameters for the Sumanpa Stream at Mampong-Ashanti in Ghana for the 1985-2009 Period

Authors

  • Richard Kotei Department of Agriculture Engineering and Mechanization, College of Agriculture Education, University of Education, Winneba, P.O. Box 40, Mampong-Ashanti, Ghana
  • Wilson Agyei Agyare Department of Agricultural Engineering, College of Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
  • Nicholas Kyei-Baffour Department of Agricultural Engineering, University of Energy and Natural Resources, Sunyani, Ghana
  • Thomas Atta-Darkwa Department of Agricultural Engineering, University of Energy and Natural Resources, Sunyani, Ghana
  • Eric TakyiAtakora Soil and Water Management Division, Soil Research Ghana Institute, CSIR, Kumasi,

Keywords:

Flow-Duration-Frequency, Exceedance Probability, Weibull Plotting position, Percentile.

Abstract

The study examined the characteristics of the Sumanpa stream’s Flow-Duration-Frequency Curve statistics for a period of 25years (1985-2009) and compared the 1990-1999 and 2000-2009 Flow-Duration-Curves. The high, low and mean Flow-Duration-Curves were also analysed. The discharge records were analysed to develop a general quantitative characterization of the stream’s flow variability. Streamflow data was generated from daily stage data using the rating curve model developed at the stream’s gauge station. Flow-Duration-Frequency-Curves were developed using the Weibull plotting position and used to analyse the catchment’s surface and groundwater storage and stream’s flow characteristics.  The approach placed the midpoints of the moist, mid-range, and dry zones of the curves at 25th, 50th, and 75th percentiles, respectively. The high zone was centered at the 5th percentile, while the low zone was centered at the 95th percentile. For 95% of the time, the streamflowequalled or exceeded 0.14 m3s-1, at 5% it equalled or exceeded 45 m3s-1 and at 50% flow equalled or exceeded 5.53 m3s-1.

The ratio of Q90:Q50 for the period was 7.0%; it dropped from 38.0% in 1990-1999 to 30.0% in the 2000-2009 decades. The mean daily flow for the 1985-2009 (30.1m3s-1) has exceedance probability of 26% and the normal flow conditions were between 2.79 m3s-1 and 9.9 m3s-1for the period.

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Published

2016-01-01

How to Cite

Kotei, R., Agyare, W. A., Kyei-Baffour, N., Atta-Darkwa, T., & TakyiAtakora, E. (2016). Estimation of Flow-Duration and Low-Flow Frequency Parameters for the Sumanpa Stream at Mampong-Ashanti in Ghana for the 1985-2009 Period. American Scientific Research Journal for Engineering, Technology, and Sciences, 15(1), 62–75. Retrieved from https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1199

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Vol. 15 No. 1 (2016): VOLUME 15, ISSUE 1: (January - 2016)

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