An Investigation on the Quantity and Quality of Groundwater in the Parishan Plain

Today because of the lack of rainfall over a several year period، excess pumping of water and use of excess groundwater in addition to poor management، it is of utmost importance to pay attention to the quantity and quality of groundwater. In this research we have emphasized one of the most important agricultural areas، Parishan Plain located in Fars Province، Iran. For this purpose، data was collected from 1382-1390 and the contour map and additional characteristics were calculated by interpolation and the use of IDW and GIS. We additionally used SPI to estimate the intensity and duration of climatic dryness. To determine the gradual drawdown the hydrograph from a piezometer (observation) well in Parishan Plain was used. Based on the collected data، the drawdown was approximately 6. 25 m from 1382-1390. The hydrograph showed that from 1382-1383 the water table increased by 2. 03 m; from 1383-1389 the water table fell by 7. 93 m; and from 1389-1390 the water table rose by 0. 26 m. Water quality decreased، particularly from 1386-90 due to the dry years and water table drawdown.