SUSTAINABLE WATER MANAGEMENT IN SERAYU CATHMENT AREA IN SUPPORTING POTENCY OF ELECTRICAL ENERGY MICROHYDRO BAN.IARNEGARA REGENCY CENTRAL JAVA PROVINCE

摘要

There are 94 points of licensing of microhydro power plant (PLTMH) in Banjarnegara District from 100 KW to thousands KW, both operational and non operational, excluding larger ones such as in Mrica reservoir. The principle of hydroelectricity is the existence of a stable water flow throughout the year and a sufficient height difference for turbine power. To support these conditions, sustainable land management is needed to ensure that water is always available. Kabupaten Banjar Negara has 18655.78 ha of forest area but 40.56% has become plantation even in its 6.3% protected forest area changed function for seasonal crops, vegetables and caribou trees and other plants, it is feared to affect the flow stability water. Agroforestry is an efficient and ecologically beneficial agroforestry example but not significant percentage needs to be improved in order to maintain the land. This study aims to calculate the area of deviation of land use in forest area and to estimate water availability for microhido. The method used is overlay map of forest area and landuse map whereas to calculate the potential of water flow used Wflow. The results of the study indicate the existence of vegetation types and other uses that deviate from the function of forest area. Forest cover in protected areas remained 2.5% and 6% in the form of plantations, whereas in forest HPT-HPK still 13%, shrubs 20.4%, plantations 40.6% in KSPA estates 0.3%, other shrubs and bushes. Runnof flow reaches 345mm in december down to 100 mm in June. River flow in order 3 and the height difference (head) is still potential for micro hydro power (100 kw). The Wanatani management model can help community and environmental management, strict supervision is required where slope above 40% is not recommended for potato plantations. Meanwhile, the area under it can be processed with the principle of agroforestry that is by mixing potato plantations with other perennials.