Study the Effect of Geological Formation On the Drinking Quality and Agriculture Water Resources of River Ardak,Mashhad

Ardak Watershed ,located in khorasan Razavi province and 70 km from Mashhad Causes a new source of dirinking water production and agriculture in Mashhad and its sububs and 1s located in terms of structural zoning,in the Kopeh Dagh.Given the water crisis and the importance of access to suitable and potable quality water in the country.Therefore, in the present study,it has been studied that it is effective in geological formation in the quality of water resources in the region.To achieve this goal,11 water samples were taken from river and dom and physical parameters such as,PH,TDS,EC and TH were measured in situ using multimeter. The average TDS is 185meq/l and average EC is271microzimens/sec and average PH is7.89 and average TH is776mg/l in Ardak river is good condition in terms of drinking and agriculture. To the piper diagram,most of water in this region was a part of the Calcic and bicarbonate type facies,and in some examples,the sulfate type,which is associated with calcareous Mozdoran formation, marl limestone Tirgan formation and marl,sandstone,gypsum Shourigeh formation.Scholler diagram showed that water needed in the region,despite being affected by geological formation is suitable for drinking and it is suitable for agriculture and a little sality.Statistical studies showed that the greatest impact on the chemical water content of Ardak river is affected by the structure of Mozdoran3 and then formation Tirgan and Shourijeh.This result canbe confirmed since the largest area of the basin is occupied by Mozdoran3 formation and its lithology is composed of carbonate rocks.