Site selection of artificial rechange of Marg watershed aquifer

The Mereg watershed is located in Kermanshah province with 1466. 150 square kilometer area٫ in west of Iran. It is one of up streams of KRB (Karkheh River Basin). Over exploitation of grand water and miss management have been caused undesirable conditions, what are reason of depletion of ground Water level. the main purpose of study was identification of site-specific to artificial-recharge in Mereg watershed In the first step, longitudinal and latitudinal profils of ground water level for 9 year between 1969-2006. Based on ereated profils, the zones with depletion of level (critical zones) were identified. Then, fifteen layers containing slop٫ land use٫ geomorphology٫ thickness of alluvium٫ lithology٫ soil٫ water table٫ dropping transfer coefficient٫ runoff areas٫ hypsometry٫ drainage network٫ fault٫ qanat٫ isothermal surfaces and isohytal have been prepared. These layers were weighted according to the three mathematical models including Boolean٫ Multi-Class-Maps and AHP and based on tow common methods of including surface and injected were intergrated. artificial recharge aquifers. Ultimately, the final maps were classified in two classes including favorable and unfavorable for Boolean model and five classes for Multi-Class-Maps and AHP including high favorable, favorable, medium, unfavorable and high unfavorable. In order to assess models٫ the most suitable units in three methods consist of slop٫ geomorphology٫ and lithology maps have been considered as field control; units with highest score in each model compared with suitable units in three layers. Results showed AHP model with most overlap and less area was selected as the best model. The second rank was for Multi–Class-Maps and Boolean method was categorizd in last rank. The average overla in these models Basedon and two methods were 97. 8, 97, 93. 7, 95, 78. 6, and 84. 6 respectively.