Determination of Bod and Fecal Coliform Pollution Loading Capacity in Plumbon River Semarang with Qual2e Software

Plumbon River is the main river in Garang River Basin which is located on Semarang, Central Java province. Plumbon watershed has an area of 22.5 km(2) and length of 19.75 km. Plumbon River is utilized by local communities as a clean water source, and for aquaculture, agriculture, and sanitary activities. Such community activities development potentially result in BOD and fecal coliform which would enter the water body. Therefore, the study of BOD and fecal coliform pollution loading capacity is required by QUAL2E software. Government Regulation Number 82 of 2001 regarding water quality management and water pollution control becomes the base regulation of pollution loading capacity. The simulation result on minimum discharge (dry season) and maximum discharge (rain season) did not fulfill class 1 or class 2 requirement, and on the other hand Fecal coliform loading capacity did not fulfill the regulation's requirement (except on segment 7). This condition is resulted from such a high quantity of domestic pollutant in the river. According to laboratory test on physics-chemical, and microbiology parameter, Plumbon River was included in the class 3 category. As a controlling strategy for pollution loading capacity, improving wastewater treatment via communal sanitary facility supply from settlement area and routine monitoring on the river's water quality were conducted.