Preliminary Studies of Groundwater Potential and It's Distribution Patterns in the Gumuk at Jember

Gumuk is a natural phenomenon that occurs in East Java, especially in Jember. The existence of gumuk scattered in the district of Jember has mined intensively, causing their numbers have declined dramatically. Collecting data in this study conducted on each of the gumuk using waypoint on GPS device consisting of latitude and longitude coordinates. Waypoint data is modified into shapefile (shp) then it is processed using ArcView Gis 3.3. Based on our preliminary studies in 2 Subdistrict of Pakusari and Ledokombo identified as cumulate gumuk while in the subdistrict of Arjasa as spread gumuk. The groundwater potential in cumulate and spread gumuk need to be investigated so that further confirming the role of gumuks as a water storage. Groundwater potential estimated using self potential methods. The results obtained in the cumulate gumuk have potential value 2 mV to -14 mV, the goundwater potential in the gumuk can be assumed to be dominant. While on the spread gumuk, soil water anomaly uneven, only at some point. The groundwater potential in this gumuk less dominant than the cumulate gumuk. From this study could be concluded that the distribution of cumulate gumuk more abundant groundwater potential than spread gumuk.