PHYSICAL WATER QUALITY RESPONSE TO RAINFALL OF BETON KARST SPRING AT GUNUNGKIDUL REGENCY - YOGYAKARTA INDONESIA

Beton karst spring is located in the Ponjong sub District Gunungkidul Regency, at the western part of Bribin undergorund river catchment area. The purpose of this study are: 1) to know the variations of rainfall and discharge in the research area, 2) to know the characteristics of the physical water quality of Beton spring and 3) to determine the relationship between the variations of the rainfall toward the discharge and the physical water quality of Beton spring. This study uses survey methods and the techniques of data collection using sample by purposive sampling. The variables are rainfall (the depth and intensity), spring discharge and physical water quality of spring (EC, T, TDS, turbidity). The data analysis is conducted graphically and descriptively to explain the relationship between the variations of rainfall to the discharge and physical water quality of spring. The results show the rainfall has variations include the pattern, events and the amount of rainfall. Beton spring has high discharge variations. The physical water quality of the spring meets to the water quality standards according to the Government Regulation number 82 years 2001. The strong correlation between rainfall variations to the discharge and the physical water quality of Beton spring can be seen clearly. It is reflected from the high value of R2