Using of Protection maps to prevent drinking water wellscontamination

One preventive in instrument for contamination of wells extracting groudwater forpublic supply is setting up protection zones around wells. For determining qualitativelimit of Sari drinking water wells, Information of 21 wells that control by water andwastewater company of Sari. So, Protection zones of Tangh Lateh has greatest areaand is going to be least toward Sari. Protection raduis is a function of hydrogeologicalcharacteristic, some extraction water and time of travel zone. The results fromcorrelation diagrams between this parameters and protection raduis explain two point:1- Some parameters has a different effects on up gradient protection raduis and downgradient protection raduis. 2- Saturated thikness has an effective role in value ofprotection raduis in Sari. With respect of correlation diagrams between effective raduisand up, down and prependicular protection raduis,The rate of protection raduis isdetermined appoximately.The results from hydrogeochemical analyze show that theprotection zone Tangeh Lateh wells has low contamination and rate of contaminationis increased toward Sari in protection zones of drinking water wells.