ANALISIS PERKIRAAN DEBIT ALIRAN PADA DAERAH ALIRAN SUNGAI UNDA BERBASIS SISTEM INFORMASI GEOGRAFIS (SIG)

The limited flow data is an obstacle that often occurs in the analysis of water availability. To obtain this data, nowadays there are many prediction models for discharge. Remote sensing technology can improve development conventional rainfall–runoff relationship model studies. With technology, it help predict runoff discharge each Sub-watershed. Unda watershed one potential watersheds province Bali. was carried out using overlay method by overlaying land use map and soil type so as to CN value, then proceed with calculating predicted rate SSCN method. From last ten years have been fluctuations discharge, where largest ever occurred 10,569 m3/s 2013 Telagawaja sub-watershed lowest 0.079 Tanah 2010. For average -the 8.068 m3/s, Masin 0.963 0.163 Nyuling 0.705 Kaun 1.653 Yeh Batah 0.564 1.722 Sangsang sub-basin 0.764 m3/s.