Erosion Prediction and Soil Conservation Planning in Lawo Watershed Indonesia

Land conversion from forest to agricultural land is a serious problem in Lawo Watershed. Agricultural practices without implementing the adequate of soil conservation and agrotechnology has led to high erosion and decrease land productivity. Management of Lawo Watershed is should be made by integrating the soil and water conservation and the increament of agriculture production. The aim of this study is to analyze the prediction of erosion and arrange the land use and soil conservation planning which actual erosion (A) is greater than tolerable eorion (T) in Lawo Watershed. USLE equation and Erosion Hazard Index is used to predict the erosion and soil and water conservation planning in the location. The results showed that moderate rate of surface erosion is dominant in the location which area of 18,804.64 ha (53.46%), which is generally spread in the center of watershed, while tolerable erosion is varies between 17.56 - 54.77 ton ha-1 thn-1 in each land unit. Erosion hazard index is the ratio between erosion predictions on each land unit with tolerable erosion in the same land unit. Index erosion which is moderate, high and very high category is dominant with total area of 19,347.66 ha (55%), this condition indicates that A value is higher than T. Therefore, it is need to manage the land unit in Lawo Watershed through land use planning and apply the soil conservation, so that the sustainability of land in the watershed can be reached. Land use planning that suggested are reforestation of shrubland area and development of agroforestry in mixed farming, while soil and water conservation that recommended are bund teracce and garden terrace combined with teracce strenghtening crop as well as mulch of 6 ton ha-1 in slope 0 – 8%. Keywords: USLE, Soil Erosion, Watershed, Erosion Index, Soil and Water Conservation

LAND CAPABILITY EVALUATION FOR LAND USE RECOMMENDATION IN LAWO WATERSHED

The changes of forest uses into agricultural land is a serious problem in Lawo watershed, South Sulawesi. Agricultural practices without implementing soil conservation and adequate agro-technology has caused high level of soil erosion and low land productivity. Management in Lawo watershed must be done with integrated soil and water conservation in order to increase agricultural production. This effort can be done with land capability evaluation. The purpose of this study is to evaluate the land capability of Lawo watershed using land capability category for data analysis. The results showed that Lawo watershed is dominated by land capability of class III with erosion (middle) as the dominant limiting factor which covers about 17,476.42 ha (49.68%). In addition, the class of land capability is followed by class IV with the slope (moderately steep) as the limiting factor and erodibility of soil (middle) covering about 10,059.8 ha (28.6%), land capability of class VI with slope (Steep) as the limiting factor with 7,638.32 ha (21.72%) coverage area. Land with class III can be recommended for dryland farming with adequate application of agro-technology, and water and soil conservation. While class IV and VI are not recommended for agricultural activities but for private forest or plantation fores

The Utilization of Satellite Imagery Data to Predict Hydrology Characteristics in Dodokan Watershed

AbstractSatellite imagery has been widely used in many fields, including watershed management, environmental management, and disaster mitigation. In watershed management field, this dataset provides the land use map that is an input for watershed management planning and prediction of hydrology characteristics of a watershed. It can be done using hydrology model that requires detailed parameters such as: land use type, soil characteristics, topography, and climatic data. This research was conducted in Dodokan Watershed at Nusa Tenggara Barat Province with area of 54,279.25ha. The hydrology characteristics of Dodokan watershed was predicted using the Soil and Water Assessment Tool (SWAT) model. Based on the analysis of three years rainfall datasets (2010-2012), land use map (2012) and soil characteristics data (2014) as well as average of curve number of 75.03, the highest surface runoff volume was 35.18mm with the highest rainfall of 52.39mm and runoff coefficient is 0.33

LAND CAPABILITY EVALUATION FOR LAND USE RECOMMENDATION IN LAWO WATERSHED

The changes of forest uses into agricultural land is a serious problem in Lawo watershed, South Sulawesi. Agricultural practices without implementing soil conservation and adequate agro-technology has caused high level of soil erosion and low land productivity. Management in Lawo watershed must be done with integrated soil and water conservation in order to increase agricultural production. This effort can be done with land capability evaluation. The purpose of this study is to evaluate the land capability of Lawo watershed using land capability category for data analysis. The results showed that Lawo watershed is dominated by land capability of class III with erosion (middle) as the dominant limiting factor which covers about 17,476.42 ha (49.68%). In addition, the class of land capability is followed by class IV with the slope (moderately steep) as the limiting factor and erodibility of soil (middle) covering about 10,059.8 ha (28.6%), land capability of class VI with slope (Steep) as the limiting factor with 7,638.32 ha (21.72%) coverage area. Land with class III can be recommended for dryland farming with adequate application of agro-technology, and water and soil conservation. While class IV and VI are not recommended for agricultural activities but for private forest or plantation fores