Watershed erosion analysis and simulation modelling of river channerl erosion in Tulang Bawang river basin

Lampung Province is the southernmost province in Sumatra Island. Geographically the province is located in 3o45’ - 6o S and 103o40’ E- 105o50’E. The total area is around 35,376 km2including the small islands around the province. Several large rivers are flow from the mountain range to the sea in Lampung Province: •Way Sekampung (way means river in Lampung language), which is 256 km in length and draining a catchment area of 4,795 km2 ; •Way Seputih with 190 km in length and a catchment of 7,149 km2; •Way Jepara with 50 km length and an area of 1,540 km2; •Way Tulang Bawang with 136 km in length and a catchment area of 1,285 km2; and •Way Mesuji with 220 km length and the area is 2,053 km2 (most of this catchment is located in South Sumatra Province)(Wiryawan,1999). The Tulang Bawang watershed, which is located in the northern part of Lampung Province, and is important for agriculture in Lampung. Four regencies are included in Tulang Bawang watershed: West Lampung and North Lampung (the origin of the river), Way Kanan and Tulang Bawang. The upper part of this basin is mountainous areas which mainly covering with coffee plantation and forest areas. Sugarcane, cassava, and oil palm plantation as well as irrigation paddy field dominate in the middle part; and in the lower part, paddy field, fisheries and aquaculture are common. A runoff river dam for electric power plant is now under construction at Sumber Jaya and will become operational in 2001; the Way Rarem dam which was built about fifteen years ago supports an irrigation in the southern part of the basin. The humid tropical climate of Tulang Bawang basin is characterized by abundant rainfall in the wet season, with an average annual precipitation of 2500-2600 mm/year.

---

• View source