Analysis of Potential Availability and Water Needs of Cisangkuy Watershed: Analisis Potensi Ketersediaan dan Kebutuhan Air di Daerah Aliran Sungai Cisangkuy

Kondisi DAS Cisangkuy mengalami degradasi yang ditunjukkan dengan semakin seringnya kejadian banjir di musim hujan dan kekeringan di musim kemarau. Beberapa kecamatan di Kabupaten Bandung mengalami banjir tahunan. Pada 2013, banjir setinggi dua meter menyebabkan Kabupaten Baleendah terisolasi. Perubahan penggunaan lahan di DAS Cisangkuy merupakan salah satu penyebab menurunnya kondisi hidrologis. Peningkatan populasi di DAS Cisangkuy menyebabkan peningkatan permintaan air. Perubahan penggunaan lahan dan peningkatan populasi dapat mengancam ketersediaan air baku di DAS Cisangkuy. Tujuan dari penelitian ini adalah untuk menganalisis keseimbangan pasokan dan permintaan air DAS Cisangkuy dan untuk menganalisis dampak perubahan penggunaan lahan pada respon hidrologi DAS Cisangkuy. Hasil penelitian menunjukkan bahwa ketersediaan air DAS Cisangkuy dengan debit rata-rata 2015 memiliki jumlah air yang tersedia hingga 343,121,970 m3. Total ketersediaan air hingga 11,104,629,178 m3 pada tahun 2015. Berdasarkan hasil ini, ada defisit air hingga 10,498,001,277 m3 tahun-1.Conditions of Cisangkuy watershed has degraded shown by more frequent flood incident in rainy season and drought in dry season. Several sub-district in Bandung district experienced annuals floods. In 2013, two meter high floods caused Baleendah Regency to be isolated. Land use change in Cisangkuy watershed is one of the cause of decline hydrological conditions. Increase of populations in Cisangkuy watershed lead to increase of water demand. Landuse change and populations increase may threat raw water availability in Cisangkuy watershed. The purpose of this research were to analyze balance of supply and demand water of Cisangkuy watershed and to analyze landuse change impact on the Cisangkuy watershed hydrological response.  Water availability of Cisangkuy watershed   by average debit 2015 showed the amount of available water up to 343,121,970 m3. Total water availability up to 11,104 629,178 m3 in 2015. Based on this results, there are water deficits up to 10,498,001,277 m3 year-1