Belizaire

Belizaire - I nter r ill erosion, r unoff and sediment size...

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EROSION PAN Edge effect is one of the problems that influence study procedures on small plots. In addition to edge effect, the size and type of a pan may have effect on interrill erosion study. For the rectangular type pans, as the area increases, splash per unit soil area decreases because the central part of the box contributes less sediment than parts closer to the edge (Le Beissonnais, 1996). Eventhuogh, the different factors that affect the initiation of rill erosion are not well studied, obviously size of pan has effect on concentration (volume) of runoff; that may in turn has effect on rill initiation. In this study, an erosion pan similar in design to Bradford and Foster (1996) with slight modification was used The study area, Alemaya, is located in eastern Ethiopia. The Alemaya woreda (area between 1850 and 2200 meters above sea level elevation) is classified as “Woina Dega” agro-ecological zone with its average annual rainfall of 870 mm (560 1260 mm range). There are six months (March to September) with more than the average monthly rainfall. The average yearly minimum temperature is 7.8 0 C (with extreme minimum of 4 0 C), average yearly maximum temperature is 22.9 0 C (with extreme maximum of 28 0 C) and average yearly mean temperature is 15.8 0 C 1†Mengistu B. Defersha, 2Shoeb Quraishi, 1Melesse, A., 1McClain, M. 1Department of Earth and Environment, Florida International University, USA 2Haramaya University, Haramaya, Ethiopia Soil erosion is a two-phase process consisting of the detachment of individual particles and
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