Determination of the water quality of Pindol river as a source of irrigation water in Bolaang Mongondow district, North Sulawesi province

Abstract

Pindol River is a river that is a source of irrigation water and raw water in Bolaang Mongondow Regency. The Pindol River is a source of the Lolak Dam water supply. The Lolak Dam which will irrigate rice fields covering an area of around 3,714 ha in Bolaang Mongondow Regency. The purpose of this study was to assess the water quality of the river Pindol as a source of irrigation water in terms of the value of Sodium Adsorption Ratio (SAR). The used method was field observation and laboratory analysis for river water samples. Water quality was carried out using the Composite Sampling Method in the Pindol River at two sampling points and three replications. The measured parameters were Na, Ca, Mg, as well as other chemical parameters. The measured data Na, Ca, Mg were calculating using the SAR formula. The data generated from laboratory analyzed descriptive statistics. The results showed that the concentration Na was 0.991 meq/l to 1.040 meq/l, Ca 0.281 meq/l to 0.292 meq/l, Mg 0.345 meq/l to 0.354 meq/l and Sodium Adsorption Ratio (SAR)at the Pindol River varied from 1.76 meq/l to 1.84 meq/l.