ANALISIS NERACA AIR PADA SUB DAERAH ALIRAN SUNGAI CODE YOGYAKARTA

Abstract Water is one of the sources human life. Population growth continues to increase and results in higher utilization water sources. This will certainly affect availability city Yogyakarta. balance a comparison between potential demand place certain period. analysis useful for knowing amount excess (surplus) or lack (deficit) so that use can be managed as well possible. The calculation was done by analyzing 10-year rainfall data using Thiessen Polygon method obtain mean value. available debit calculated F.J. Mock method. dependable discharge with 80% reliability from data. sorted largest smallest value, probability value obtained interpolation sequence. based on irrigation planning standard (KP-01). study show average sub-watershed Code River Yogyakarta 527.92lt/sec. Based analysis, highest deficit occurred first October at 278.40 l/sec lowest second July 73.01 l/sec. However, months quite abundant. Therefore, it necessary do special not wasted used cover shortages dry months. Keywords: balance, availability, demand, river, polygon, FJ mock