Evaluation of Kalibomo watershed water quality using the storet method

Abstract

The Kali Bomo watershed has a length of ± 7,417 km and passes through Rogojampi District, Banyuwangi Regency. Rogojampi sub-district consists of 10 villages, including Aliyan Village, Powder Village, Gitik Village, Gladak Village, Karangbendo Village, Kedaleman Village, Lemahbangdewo Village, and Mangir Village. The area of Rogojampi District is 102.25 km2 with a population of 94,268 people. There are 4 watersheds (DAS) in Rogojampi District, namely Binau, Tambong, Bomo and Lumbun which irrigate 11,819 hectares of rice fields and 1,113 hectares of land for corn cultivation. The main problem in watersheds in general is the occurrence of changes in land use due to development both upstream, middle and downstream as well as the conversion of forests into cultivated agricultural land. This has an impact on reduced water absorption function, increased erosion, sedimentation and river water quality. Based on the above conditions, it is very important to conduct water quality analysis, especially in the Kali Bomo watershed so that its sustainability can be maintained. The results of the water quality analysis using the STORET method show that the water quality of the Kali Bomo watershed in the 2017 period from January to April for class I, II, III and IV quality is poor, bad, moderate and moderate, respectively.