Quality and Usage Possibilities of Groundwater at Misli (Nigde) Plain ; MİSLİ OVASI (NİĞDE) YERALTISULARININ KALİTESİ VE KULLANIM OLANAKLARI

The basement of the study area formed by Crateceous aged gabbros. Over the basement, the rock units span to Cenozoic to Quaternary. The volcanic activity in the region started at Miocene and ended at the end of Quaternary. In this process, the Melendizdağı at first and the Hasandağı volcanites at later were formed. The alluviums and rock talus are the youngest units in the region and were derived from pebbles and sand of volcanic and magmatic origin. The quaternary deposits with high permeability make the aquifer formations of the study area. In tthe investigated area, the aquifers with free pressure made up of tuffs, pebbles, sands and silts around Gölcük (Misli) and through the northwest (Kiledere and its surrounds) the aquifers become pressured as the alluvium interrupted by clay strata. Because of faulting in the Gölcük, Kiledere and Suvermez line, the thickness of the sediments increased at the middle and north of the basin. The underground water map indicates that the water flow from E-SE to W-NW. Since the anions and cation lines of the water are almost parallel to each other in the diagrams the waters are of similar origin. The waters classified as CaCO3 and MgCO3 waters exceeding 50 % carbonate contents. The hardness (stiffing) of the waters are between 18-36 0Fs, while the pH is between7 to 8. Since the EC values are between 456 and 1530 mS/cm, and according to the Standards Institute of Turkey (TSE 266, 1997) and World Health Organization (WHO, 1999) the water is drinkable. For drinkable standards the water in the region is classified as 1st and 2nd quality water while the water according to the Schoeller diagrams can be classified as ‘very good-good and good usage’ for irrigation purposes. The water named as ‘C2S1 and C3S1’ according to the USA Salinity Laboratory. The water is described as carbonate precipitates and the sulphate dissolving water in accordance with saturation indices. The isotopic investigations reveal that the waters are of similar with each other and similar with meteoric origin. ...