KAJIAN POTENSI DAN PEMANFAATAN SUMBERDAYA AIR PULAU BAWEAN

• Main Authors: , Dian Ariestyowati, , Prof. Dr. Ir. Djoko Marsono
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2011
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/90038/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=52342
• Institution: Universitas Gadjah Mada

Bawean is a small island with an area of ±200 km2 and located 150 km north of Gresik City. Usually the people who live on islands, they demanded to be independent in fulfilling their water needs. Fresh water supply in a small island depends on the land ability to absorb rainfall. Land capability is influenced by the hydrologic conditions of its land cover. Forested land can absorb the rainfall better than other forms of land use. In Bawean Island, there are Bawean Nature Reserve and Bawean Wildlife Sanctuary which have tropical rain forest ecosystem, with an area of 4556,6 hectares or about 22% of the total area of the island. The aims of this research were to identify the potential and utilization of Bawean Island�s water resource, water balance, and to set a land cover improvement proposal for optimizing the water resource. The method used to predict water resource potential was curve number developed by the US Soil Conservation Service. This model is uses an index known as curve number. By identifying the land curve number, the surface runoff will be discovered after the rainfall. Water utilization was estimated by evaluating domestic use, which was gathered from interviewing respondents in proportional random sampling, water needs for agriculture (irrigation), livestock farming, education, offices, and mosques. Water balance was obtained from water critical index equation. A land cover improvement proposal was designed by restoring the land cover hydrological conditions in order to decrease the surface runoff. The results of this research showed that water resource potential was 520.983.873 m3 and water utilization for domestic use, agricultural, livestock, education, offices, and mosque use were 48.766.863 m3/year. Water balance was 9,4% and classified as not critical yet. The proposed improvement land cover resulted in a lessening curve number from 77,72 to 77,06 which had the effect of decreasing surface run off and consequently increasing water resource potential to 526.646.486 m3.