KAJIAN PEMENUHAN KEBUTUHAN AIR BAKU DI KOTA PASIR PENGARAIAN KABUPATEN ROKAN HULU

Abstract

The needs of clean water in Pasir Pengaraian City increasing in line with population growth and urban growth. Water supply systems that are currently held by BPAB still have the problem with the lack of service coverage. Therefore, the existence of Lubuk Batang River is expected to be a solution to overcome these problems. This study uses IHACRES in modelling flow discharge, which in calibration stage generated the R2 value of 0,437 with a bias 53,131 mm/year. Analysis for the availability of water is done by analyzing the mainstay of river discharge (Q90%) based on the average annual discharge that produced the flagship in 2005. Mainstay discharge occurred in January 2005 amounted to 260,8 m3/sec and smallest discharge in June 2005 was 30,5 m3/sec. Analysis of water needs is projected to the population growth in the next 10 years, produced the total water demand for the Pasir Pengaraian City’s (Rambah District) service area at the beginning of the projection year (2012) that is equal to 0,0491 m3/second (49,082 liters/sec), while the total requirement water at the end of the projection year (2022) amounted to 0,066 m3/second (65,962 liters/sec). The analysis showed that the available flow at Batang Lubuk River very inadequate even exceed the total water demand in the area of service coverage.