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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10765

Title: Estimation of Flow-Duration and Low-Flow Frequency Parameters for the Sumanpa Stream at Mampong-Ashanti in Ghana for the 1985-2009 Period
Authors: Kotei, Richard
Agyare, Wilson Agyei
Kyei-Baffour, Nicholas
Atta-Darkwa, Thomas
Atakora, Eric Takyi
Keywords: Flow-Duration-Frequency
Exceedance Probability
Weibull Plotting position
Issue Date: 2016
Publisher: American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS
Citation: American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS, (2016) Volume 15, No 1, pp 62-75
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.
Description: An article published by American Scientific Research Journal for Engineering, Technology, and Sciences (ASRJETS, (2016) Volume 15, No 1, pp 62-75
URI: http://hdl.handle.net/123456789/10765
Appears in Collections:College of Engineering

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