Abstract:
Extraction of groundwater that much can cause a decrease in ground water level. The negative impact of a decrease in ground water level were the intrusion of sea water, ground water quality degradation, and land subsidence. Such a condition is necessary to determine the availability of ground water that will be used for various purposes. The purpose of this study was to predict the availability of groundwater in the unconfined aquifer system in the district of Bukit Raya as a function of time. The method used in this research was the finite difference method. The data used were secondary data related to biophysical, socioeconomic community, demographic and other supporting data. The data were obtained from BPS Pekanbaru. The results showed that in the district of Bukit Raya with the population growth rate began in 2017 to 2021 was at 1.44%, the rate of decrease in the depth of the unconfined aquifer was obtained from 2017 to 2021 amounted 0.011 m/year, with a maximum error of simulation was 0.795%. The availability of groundwater began in 2017 to 2021 experienced a rate increase of 132,861.5 m 3/year.
