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Table 5. Value of vegetation factors in the research area 5). Conservation Action Factor (P)

Table 5 Value of vegetation factors in the research area 5). Conservation Action Factor (P)

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The study was conducted at the confluence of two rivers on the Tawaeli River, Nupabomba Village, Tanantovea District, which is located between 119°54'0" to 119°54'30" east longitude and 0°44'0" to 0°44'30" south latitude. Figure | illustrates the site of research location. Figure 1. Research site
The study was conducted at the confluence of two rivers on the Tawaeli River, Nupabomba Village, Tanantovea District, which is located between 119°54'0" to 119°54'30" east longitude and 0°44'0" to 0°44'30" south latitude. Figure | illustrates the site of research location. Figure 1. Research site
Administratively, the Upper Tawaeli watershed is part of the Tawaeli District of Palu City in the downriver part, while upriver the watershed is included in the Tanantovea District of Donggala Regency. This watershed has an area of approximately 3453,188 Ha which is located between 119°53'30” to 119°59'10”E and 0°41'30” to 0°45'30” South Latitude, which is an area with a slope that varies between 8 % to 72%. The contours of the Upper Tawaeli watershed area can be seen in Figure 2. Figure 2. Topographic map of the Upper Tawaeli Watershed area
Administratively, the Upper Tawaeli watershed is part of the Tawaeli District of Palu City in the downriver part, while upriver the watershed is included in the Tanantovea District of Donggala Regency. This watershed has an area of approximately 3453,188 Ha which is located between 119°53'30” to 119°59'10”E and 0°41'30” to 0°45'30” South Latitude, which is an area with a slope that varies between 8 % to 72%. The contours of the Upper Tawaeli watershed area can be seen in Figure 2. Figure 2. Topographic map of the Upper Tawaeli Watershed area
Table 3. Average K value of each Upper Tawaeli Sub- watershed
Table 3. Average K value of each Upper Tawaeli Sub- watershed
3.2 Factors affecting erosion processes in the Upper Tawaeli Watershed Table 2. Climate conditions in Tawaeli District in 2020
3.2 Factors affecting erosion processes in the Upper Tawaeli Watershed Table 2. Climate conditions in Tawaeli District in 2020
Based on the soil type map of the Regional Planning and Development Agency of Central Sulawesi Province, the Upper Tawaeli watershed area has 3 (three) soil types, namely Alluvial soil, Litosol, and Red Yellow Podsolic. For more details regarding the distribution of soil types in the Upper Tawaeli watershed area (Figure 4). Figure 4. Map of the distribution of soil types in the Upper Tawaeli Watershed area
Based on the soil type map of the Regional Planning and Development Agency of Central Sulawesi Province, the Upper Tawaeli watershed area has 3 (three) soil types, namely Alluvial soil, Litosol, and Red Yellow Podsolic. For more details regarding the distribution of soil types in the Upper Tawaeli watershed area (Figure 4). Figure 4. Map of the distribution of soil types in the Upper Tawaeli Watershed area
The land cover map for the Upper Tawaeli Watershed in 2020 can be seen in Figure 3.
The land cover map for the Upper Tawaeli Watershed in 2020 can be seen in Figure 3.
4). Vegetation Factor (C) Table 4. Average LS value of each Upper Tawaeli Sub- watershed
4). Vegetation Factor (C) Table 4. Average LS value of each Upper Tawaeli Sub- watershed
Table 6. Soil conservation index in the study area
Table 6. Soil conservation index in the study area
The calculation of erosion using the USLE method is done by multiplying all the factors that cause erosion (R, K, LS, C and P). Based on the calculation of the erosion rate using the USLE method using ArcGIS, the total value of the erosion rate that occurs is 13506,865 tons/year, which means that each hectare of the watershed is able to produce sediment from the erosion process of 4,3977 tons/ha/year. Then regarding the distribution of the level of erosion hazard in the Upper Tawaeli watershed area as a whole, it can be seen in Figure 5. Figure 5. Map of distribution of erosion hazard levels in the Upper Tawaeli Watershed
The calculation of erosion using the USLE method is done by multiplying all the factors that cause erosion (R, K, LS, C and P). Based on the calculation of the erosion rate using the USLE method using ArcGIS, the total value of the erosion rate that occurs is 13506,865 tons/year, which means that each hectare of the watershed is able to produce sediment from the erosion process of 4,3977 tons/ha/year. Then regarding the distribution of the level of erosion hazard in the Upper Tawaeli watershed area as a whole, it can be seen in Figure 5. Figure 5. Map of distribution of erosion hazard levels in the Upper Tawaeli Watershed
Analysis of sediment transport in the confluence area of the Tawaeli River was carried out using HEC-RAS software based on primary and secondary data, and based on the Meyer — Peter and Miiller sediment transport analysis method. The simulation is carried out for a simulation time of approximately 1 year. From the analysis of total sediment transport in the Upper Tawaeli watershed using the Meyer — Peter and Miiller equation, it shows that the total sediment produced by all rivers in the upriver Tawaeli watershed is 1308.293 tons/year. Figure 6. Flowpath schematic at the confluence area of the Tawaeli River
Analysis of sediment transport in the confluence area of the Tawaeli River was carried out using HEC-RAS software based on primary and secondary data, and based on the Meyer — Peter and Miiller sediment transport analysis method. The simulation is carried out for a simulation time of approximately 1 year. From the analysis of total sediment transport in the Upper Tawaeli watershed using the Meyer — Peter and Miiller equation, it shows that the total sediment produced by all rivers in the upriver Tawaeli watershed is 1308.293 tons/year. Figure 6. Flowpath schematic at the confluence area of the Tawaeli River
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