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.
