KAJIAN KUALITAS AIR WILAYAH SUNGAI BENGAWAN SOLO PLTA WONOGIRI

Abstract

Wonogiri multipurpose dam in addition to having the function as hydropower as well as a source of irrigation water, drinking water, aquaculture and flood control are managed by Perum Jasa Tirta I. This study aims to analyze the water quality and water quality status of the Wonogiri Reservoir. The research was carried out in the Wonogiri reservoir which is located in the area of the Wonogiri reservoir and the river that enters the Wonogiri reservoir. The research was conducted in February and September 2020 (2 semesters) by conducting 2 samples. Water quality data obtained were compared with quality standards based on Government Regulation No. 82 of 2001. The status of water quality was calculated and analyzed using the Pollution Index (IP) based on Decree of the State Minister for the Environment No. 115 of 2003. Parameters that exceed the quality standard in the Bengawan Solo River Basin, PLTA Wonogiri in semester 1 are BOD at observation points I, II, V, and VII. Other parameters that exceed the quality standard are oil and fat at observation points II, IV, V, VII, and VIII. The status of water quality in semester 1 at points I, II, V, VII, and VIII is included in the lightly polluted category, so that at the observation point it can no longer match the designation of class III water. Water management efforts need to be made at this point. The parameter that exceeds the quality standard in the Bengawan Solo River Basin, PLTA Wonogiri in semester 2 is the BOD at observation point VI. The status of water quality in semester 2 at all observation points is included in the category of meeting quality standards, so that the water management efforts in semester 1 at points I, II, V, VII, and VIII are included in the lightly polluted category have been successful. In semester 2, all water quality observation points can still be used according to the designation of Class III water, namely for the cultivation of freshwater fish, animal husbandry, water for irrigating crops and / or other uses similar to these uses.