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Quantifying rainfall-runoff relationships on the Dera Calcic Fluvic Regosol ecotope in Ethiopia

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  • Welderufael, W.A.
  • Le Roux, P.A.L.
  • Hensley, M.

Abstract

Droughts, resulting in low crop yields, are common in the semi-arid areas of Ethiopia and adversely influence the well-being of many people. The objective of this study was to assess the benefit that in-field rainwater harvesting (IRWH) would have, compared to conventional tillage, on maize yields on a semi-arid ecotope at Dera situated on the eastern part of the Rift Valley. Rainfall-runoff measurements were made during 2003 and 2004 on 2 m x 2 m plots provided with a runoff measuring system and replicated three times for each treatment. There were two treatments: conventional tillage (CT) and no-till (NT), the latter with a flat surface that promotes runoff and therefore IRWH. Rainfall intensity was measured at 1 min intervals with an automatic tipping bucket instrument, and runoff was measured after each rain event. Measured runoff as a function of rainfall intensity and duration from half the rainfall-runoff events was used to determine the critical parameters of a appropriate runoff model. The calibrated model was found to be capable of predicting runoff in a satisfactory way. Rainfall-runoff measurements were made during the rain seasons in 2003 and 2004 during which there were 25 rain events with >9 mm of rain. There was no statistical difference between the runoff on the two treatments. The measured runoff (R) for the two rain seasons, expressed as a fraction of the rainfall during the measuring period (P), i.e. R/P, gave values of 0.46 and 0.39 for the NT and CT treatments, respectively. Results from 7 years of field experiments with IRWH at Glen in South Africa were used to estimate the yield benefit of NT for Dera compared to CT. The results were 696 and 494 kg ha-1 for 2003 and 2004, respectively. Based on the estimated average long-term maize yield of 2000 kg ha-1 at Dera, this was an estimated yield increase ranging from 25% to 35%.

Suggested Citation

  • Welderufael, W.A. & Le Roux, P.A.L. & Hensley, M., 2008. "Quantifying rainfall-runoff relationships on the Dera Calcic Fluvic Regosol ecotope in Ethiopia," Agricultural Water Management, Elsevier, vol. 95(11), pages 1223-1232, November.
    • Handle: RePEc:eee:agiwat:v:95:y:2008:i:11:p:1223-1232
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    References listed on IDEAS

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    1. Ojasvi, P. R. & Goyal, R. K. & Gupta, J. P., 1999. "The micro-catchment water harvesting technique for the plantation of jujube (Zizyphus mauritiana) in an agroforestry system under arid conditions," Agricultural Water Management, Elsevier, vol. 41(3), pages 139-147, August.
    2. Oweis, T. & Hachum, A. & Kijne, J., 1999. "Water harvesting and supplemental irrigation for improved water use efficiency in dry areas," IWMI Books, Reports H024198, International Water Management Institute.
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    1. Assefa, Shibeshi & Biazin, Birhanu & Muluneh, Alemayehu & Yimer, Fantaw & Haileslassie, Amare, 2016. "Rainwater harvesting for supplemental irrigation of onions in the southern dry lands of Ethiopia," Agricultural Water Management, Elsevier, vol. 178(C), pages 325-334.

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