The Effect of Well Depth on Water Quality in Neiboring Zone of Zayandehroud, Iran

The location of a well related to surface drainage ways is important in determining the potential for groundwater contamination from surface water flow. Locating a well in a safe place needs careful consideration and planning.To determine the effects of well depth on water quality, the wells up to 4 m. depth and 100 m. far from river were selected in Isfahan. Geologically, the earth in this zone composed of clay (more on surface) and sand (particularly in depths higher than 1 m.). Flow direction of river with comparison static level of wells and bottom of river is toward wells. The parameters were measured according to the standard method. Finally, a total of 100 samples were taken and analyzed. Results of this study showed that Total Coliform, Fecal Coliform, COD, NO , Total Dissolved Solid and Electrical Conductivity showed a rang of 3-460 and 0-29 MPN/100 mL, 3 2-12, 1.39 4.15, 320-783 mg/L and 571-1350 μmoh/cm, respectively. Finally, we observed that NO , Electrical 3 Conductivity and Total Dissolved Solid increased and Total Coliform, Fecal Coliform decreased with increasing well depth.