Tag Archives: Watershed

The Damage of Deli River Watershed Causing Flood, Medan, Indonesia (Published)

The determination of the Deli watershed, Medan, North Sumatra, Indonesia  as a critical watershed is because the critical land area is almost half of the total Deli River area, which will theoretically affect the sustainability of the land and water resources of the Deli watershed area. The watershed is a land area bounded by a natural boundary of topography that serves to accommodate, store, and drain the water received to the nearest river system which further leads to reservoirs or lakes or seas. the damage to agricultural land is increasing. This may result from erosion, water logging, accumulation of salts in saline areas, the accumulation of elements or compounds that are toxic to plants due to the use of chemical fertilizers and chemical drugs continuously every year. Deli land destruction is dominated by biophysical factors, especially land use, slope, landform, and rainfall in the upstream Deli sub watershed.

Keywords: Deli River, Flood, Restoration, Watershed

AN ASSESSMENT OF SPATIAL ANALYSIS OF EROSION RISK IN SHAFE WATERSHED, WESTERN HILLS OF L. ABAYA, SOUTH WESTERN ETHIOPIA (Published)

The study area is among the most affected parts of Ethiopian highlands that suffered from soil degradation of varying categories, over grazing and siltation resulted from inappropriate land use practices, and historic settlement. This paper tried to quantified rate of soil loss and regionalized erosion risk areas in intensive farming mountainous environment of Shafe watershed. In so doing, Universal Soil Loss Equation (USLM) and Geographic Information Techniques (GIS) are used to map and estimate mean annual soil loss in the area. Laboratory analysis of soil revealed except in the homestead plots, total nitrogen and organic matter content of the soil was low and progressively decreasing away from the homestead. Mean annual soil loss in the study area ranged between 0.04 t and 70 t ha-1 y-1. In the area low to moderate erosion hazardous areas are found in south and central part, while high to severe erosion risk areas are concentrated in the intensively cultivated hilly northern localities. More than a third of the study watershed (32.8 %) is categorized under high to severe erosion risk area with soil loss rate ranged between 30 t and 70 t ha-1 y-1.

Keywords: Soil erosion, Universal Soil Loss Equation, Watershed, and Geographic Information System, sustainable management

An assessment of Spatial Analysis of Erosion Risk in Shafe watershed, Western Hills of L. Abaya, South Western Ethiopia (Review Completed - Accepted)

The study area is among the most affected parts of Ethiopian highlands that suffered from soil degradation of varying categories, over grazing and siltation resulted from inappropriate land use practices, and historic settlement. This paper tried to quantified rate of soil loss and regionalized erosion risk areas in intensive farming mountainous environment of Shafe watershed. In so doing, Universal Soil Loss Equation (USLM) and Geographic Information Techniques (GIS) are used to map and estimate mean annual soil loss in the area. Laboratory analysis of soil revealed except in the homestead plots, total nitrogen and organic matter content of the soil was low and progressively decreasing away from the homestead. Mean annual soil loss in the study area ranged between 0.04 t and 70 t ha-1 y-1. In the area low to moderate erosion hazardous areas are found in south and central part, while high to severe erosion risk areas are concentrated in the intensively cultivated hilly northern localities. More than a third of the study watershed (32.8 %) is categorized under high to severe erosion risk area with soil loss rate ranged between 30 t and 70 t ha-1 y-1.

Keywords: Soil erosion, Universal Soil Loss Equation, Watershed, and Geographic Information System, sustainable management