Hydrogeologıc assesment of Uluova (Elazığ) by geographıcal ınformatıon systems

24 million m3 annual drinking water requirement of Elazığ city and 5000ha agriculture land irrigation are acquired from the groundwater resources of Uluova plain. Moreover, 13,000 ha agriculture land irrigation is supplied by surface irrigation canals where water is taken from Keban dam reservoir and Hazar lake.In this study, seasonal (6 month period) groundwater fluctiations between 2004-2007 were assessed with respect to the 49 wells. Physical and chemical analyses were performed on water samples taken from Haringet stream, Keban dam reservoir, Hazar lake and water wells. Than, surface and groundwater samples were evaluated in Piper, Schoeller, Wilcox and USA Salinity Diagrams.It is determined that the groundwater level have been gradually decreasing in Uluova. Except the Hazar lake water, the rest of the surface and groundwaters were found suitable for agricultural irrigation purposes. Hazar lake water is inappropriate for agricultural irrigation due to its high Na content. Keban reservoir, Haringet stream and groundwater in certain water wells were found inappropriate for drinking water quality because of high arsenic content according to the TS 266 standarts.