Effect of Land Uses and Physical Soil and Water Conservation Practices on Runoff and Soil Loss in Western Tigray, Ethiopia

2018 ◽  
Vol 2 (1) ◽  
pp. 1-5
Author(s):  
Hailemariam Abrha ◽  
Berhe Abraha ◽  
Gebremariam Yaebio
2013 ◽  
Vol 34 (3) ◽  
pp. 236-259 ◽  
Author(s):  
Gebeyehu Taye ◽  
Jean Poesen ◽  
Bas Van Wesemael ◽  
Matthias Vanmaercke ◽  
Daniel Teka ◽  
...  

Solid Earth ◽  
2017 ◽  
Vol 8 (1) ◽  
pp. 13-25 ◽  
Author(s):  
Tegegne Molla ◽  
Biniam Sisheber

Abstract. Soil erosion is one of the major factors affecting sustainability of agricultural production in Ethiopia. The objective of this paper is to estimate soil erosion using the universal soil loss equation (RUSLE) model and to evaluate soil conservation practices in a data-scarce watershed region. For this purpose, soil data, rainfall, erosion control practices, satellite images and topographic maps were collected to determine the RUSLE factors. In addition, measurements of randomly selected soil and water conservation structures were done at three sub-watersheds (Asanat, Debreyakob and Rim). This study was conducted in Koga watershed at upper part of the Blue Nile basin which is affected by high soil erosion rates. The area is characterized by undulating topography caused by intensive agricultural practices with poor soil conservation practices. The soil loss rates were determined and conservation strategies have been evaluated under different slope classes and land uses. The results showed that the watershed is affected by high soil erosion rates (on average 42 t ha−1 yr−1), greater than the maximum tolerable soil loss (18 t ha−1 yr−1). The highest soil loss (456 t ha−1 yr−1) estimated from the upper watershed occurred on cultivated lands of steep slopes. As a result, soil erosion is mainly aggravated by land-use conflicts and topographic factors and the rugged topographic land forms of the area. The study also demonstrated that the contribution of existing soil conservation structures to erosion control is very small due to incorrect design and poor management. About 35 % out of the existing structures can reduce soil loss significantly since they were constructed correctly. Most of the existing structures were demolished due to the sediment overload, vulnerability to livestock damage and intense rainfall. Therefore, appropriate and standardized soil and water conservation measures for different erosion-prone land uses and land forms need to be implemented in Koga watershed.


2017 ◽  
Author(s):  
Kaisar

This study aims to (1) Predicting the actual erosion and erosion determine which allowed the various patterns of farming in the village Palatta Tapango District of Polewali Mandar, (2) Formulate soil and water conservation measures on each pattern farm. This researh was conducted in the village of the District Palatta Tapango Polewali Mandar. Data collected through direct observation of the research object in the field. The method used in predicting the amount of erosion is common soil loss equation (USLE method). The result showed that the amount of erosion that accurs in six patterns of farming is 42.76 tons per hectare per year. Based sixth farming patterns were obtained magnitude of the rate erosion on any bentukpola,namely (1)Gamal, banan, jackfruit, durian, Grass 17.86 tonnes per hectare per year, (2) Brown, of falm, Rambutan, Gamal, Litter 10.08 tons per hectare per year, (3) Sengon, Banana, Mango, Chocholate, Coffe, Bushes 4.70 tonnes per hectare per year, (4) Brown, Pinus, Litter 4.20 tonnes per hectare per year, (5) of palm, Brown, jackfruit, banana,Gamal, Litter 3.61 tonnes per hectare per year, and (6) Langsat, Durian, Brown, grass 2,31 tons per hectare per year. The amount of erosion that occurs in various patterns of faming still exceeds the amount of erosion is allowed. To that end, the necessary efforts to reduce the rate of erosion of soil conservation practices and land uses that provide protection or land cover better.


Hydrology ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 61
Author(s):  
Abelardo A.A. Montenegro ◽  
Thayná A.B. Almeida ◽  
Cleene A. de Lima ◽  
João R.C.B. Abrantes ◽  
João L.M.P. de Lima

This paper aims to investigate the performance of mulch cover with coir dust (Cocos nucifera L.) and cover crop with Palma cactus (Opuntia ficus indica Mill.) as soil and water conservation techniques, in a laboratory soil flume under simulated rainfall. Palma cactus plants oriented at 90° and 30° angles with the slope direction were considered. Simulations comprised uniform advanced and delayed rainfall patterns. Runoff hydrographs and soil loss were monitored at the downstream end of the flume. Soil moisture and flow velocity were measured, and several hydraulic parameters of runoff were estimated. Results show that both mulch cover with coir dust and cover crop with Palma cactus were effective in reducing runoff and soil loss and increasing soil moisture content, thus being both suitable soil and water conservation techniques for semiarid environments. Coir dust was more effective than Palma cactus. Palma cactus oriented at a 90° angle was slightly more effective than Palma cactus oriented at a 30° angle. Differences between advanced and delayed rainfall patterns on the hydrological and erosive response were more pronounced for the mulch cover condition, where no runoff and soil loss were observed at the downstream end of the flume for the advanced rainfall pattern.


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