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IJSTR >> Volume 9 - Issue 4, April 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

A Study Of Watershed Characteristics Of Tiga Dihaji Dam

[Full Text]



Teguh Prastowo, Anis Saggaff, Febrian Hadinata



Dam, Morphometry of Watershed, Morphology of Watershed, Meteorology of Watershed, Curve Number.



Tiga Dihaji Dam is a vital water resource infrastructure building because it has a very important function for the community living downstream of the dam as a provider of raw water with a capacity of 1 m3/second, serving 38,500 Ha of irrigation, generating 35.74 MW of electricity and also playing a role in reducing floods by 7.04%. With this role, a study of the characteristics of watersheds (DAS) is needed so that the services provided by the Tiga Dihaji Dam will always be optimal and also this study will provide a basis for the management agencies in preparing the Watershed Management Plan. The analysis of the morphometric characteristics of the Watersheds of Tiga Dihaji Dam reveals that the watershed area of 1,158.2 km2 can be identified, with an elongated watershed and a river length of 61.3 km. The density of the watershed is classified as Very Rough as indicated by a Dd value of 0.26. It can also be illustrated through the river branching variable through the Br value of 5.42 which means that the Tiga Dihaji Dam Watershed has the characteristics of a rapid increase in flooding, as well as its decline. Based on its meteorological characteristics, this watershed has a high average annual rainfall of 2,535 mm / year, while the climate condition of the watershed is known to have an average temperature of 26.5 - 28.0 oC, irradiation time ranges from 35.8 - 67.4%, humidity ranges from 78.7 - 87.6% and wind speeds range from 1.2 to 1.8 m/second. Geologically, the Tiga Dihaji Watershed is composed of clay rock, sandstone, silt and napal rock at 43.3%, while the soil type is dominated by Sandy Clay Loam, which means that the watershed has the potential to produce a fairly large river discharge. While the distribution of heights ranges from 0-2,500 masl with a slope of 0.965%. In terms of land use, the Tiga Dihaji Dam watershed is dominated by 47.1% of dry land farming mixed with bushes. The land use map and the land map results in composite curve number for the Tiga Dihaji Dam watershed of 79 which means that this watershed is large enough to pass rainwater to become runoff discharge.



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