Abstract
Rembang regency, Central Java Province, where annually facing drought is laid in the northern part of Java coastal area. Geographically, Rembang has various typical of landscape where affects to the water availability. There are three main problems in Rembang for water management issues, lack of quantity, quality, and continuity. To identify the water availability in order to measure the water quantity and continuity, initial research to detect the surface water in river network was carried out by applied topographic wetness index (TWI) from remote sensing, ground checked observation and focus group discussion (FGD) to find out the existing situation. The result showed, TWI was successful to detect the surface water availability in Rembang regency catchment area from its range number. Those numbers indicate the potential of surface water in focus area although the water quantity is unstable.
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