KAJIAN KUANTITAS DAN KUALITAS AIR (Studi Kasus : DAS Gajahwong)

• Main Authors: , Sukma Sayono Putro, , Prof. Ir. Joko Sujono, M.Eng., Ph.D
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2014
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/130041/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=70452
• Institution: Universitas Gadjah Mada

The availability of water in the Gajahwong watershed in 2012 deficit in some areas of the service due to droughts that cause discharge decreased up to 40%. In addition, Gajahwong watershed is one of the nine rivers in the province of Yogyakarta who have experienced loss of quality, because it is contaminated by sewage. Some pollutant parameters that have exceeded the quality standard in the Gajahwong watershed namely : BOD, COD, TSS, phosphates, faecal coliform, and total coliform. The study is expected to note the relationship of the river to the discharge of water pollution parameters. It can be studied water pollution control efforts are suitable with the hydrologic characteristics and capacity of the pollution load in an attempt to realize the benefits of sustainable water resources . In the analysis of the water quantity by using a Mock model will obtain availability of water in form the reliable discharge with graphical Flow Duration Curve method. The length of rainfall data and climatological data were used for 12 years, starting from 2001 until 2012. Determination of the status of river water quality was analyzed with Pollution Index Method to determine water quality conditions, whether contaminated or not. Study the relationship of quantity and quality of water can be described by the relationship between discharge and water quality parameters that can be known the relationship between changes in levels of pollution parameters with the water discharge in the Gajahwong watershed. Gajahwong watershed reliable discharge 80% outcome of flow duration curve at monitoring points in Wonokromo was 0,797 m 3 /s. Water quality conditions in the Gajahwong watershed from upstream to downstream has declined with the status of moderately polluted. During 2007 to 2012 the levels of TDS, TSS, DO, COD, detergents, oils and fats, and faecal Coliform has decreased. Concentration of water quality parameters was increased like BOD, phosphate, and total coliform are causing polluted water. Gajahwong watershed polluted by TSS, BOD, COD, Phosphates, Detergents, Oils and Fats, faecal coliform, and total coliform concentration exceeds the threshold for water quality standards class II according to Governor Regulation Yogyakarta Provincial No.20 of 2008.