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10th International Rainwater Catchment Systems Conference
"Rainwater International 2001"
Mannheim, Germany - September 2001

Section 4: Rainwater Catchment in Agriculture

Paper 4.12

The Influence of Rain Intensity and Crop Stages on Runoff Production

W.P. Spaan and E.E van Loon
Department of Environmental Sciences
Wageningen University
Nieuwe Kanaal 11, 6709PA
Wageningen
The Netherlands
email: wim.spaan@users.tct.wau.nl

Abstract

The efficacy of vegetation barriers intended for runoff reduction was evaluated at a research station in central Burkina Faso. On a 2 % slope of a sandy loam seven local species (grasses, woody species and a succulent) were planted as conservation barriers to examine their influence on soil and water conservation. After each erosive storm runoff was measured to determine the catch efficiency. Large differences were found between the barrier types. Grasses proved to be very effective. The through-flow in the barriers with woody species and succulents was rather high. Compared to this barrier effect, the effects of rain intensity and crop development are rather small. Runoff reduction during the growing season is highest on plots without a barrier and on plots with the less effective Agave and Ziziphus barriers. The increase of rain intensity is resulting in the highest reaction on plots with Agave and Ziziphus barriers. On plots with the more effective Andropogon barrier the influence of rain intensity and crop stages is rather small.

PDF of full document (4pp, 24kb)


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