Mapping of Groundwater Vulnerability to Contamination Using (PI) Method Study area (Marqieh and Alhousen watershed ) in Tartous

The research mainaim is Mapping of Groundwater Vulnerability to Contamination Using (PI) Method toevaluatethe study area (Marqieh and Alhousen watershed ) in Tartous governorate. The area of study forms a part of the coast basin, on the east coast of the Mediterranean Sea, located north of the Tartous governorate between , 34 5000,35 1000latitude in the north of the equator, and , 35 5000,36 2000 longitude in the east of the Greenwicharea covers about 700 Km2. The PI method is a GIS-based approach(We use ARCGIS .10 and the tool : Spatial Analyst Tools) , and gives special methodological tools for karstic aquifer , geological conditions , climate , relief , land use , all these conditions are mapped separately as individual maps and then integrated to achieve the groundwater vulnerability map. all the maps related to the study area was created in digital form and apply analysis processes to create vulnerability map which is a map divided to the fields and every field represents the possibility of contamination of groundwater in this region, whether high or low . The results obtainedfrom this study indicate that about 41% of the study area is under high groundwater vulnerability, 59% is under moderate, low and very low vulnerability.

Groundwater Vulnerability Assessment Study case: Deveh Spring

Groundwater is an important source of drinking water. Therefore; groundwater contamination is a source of continuing concern. Groundwater contamination is unlike surface water contamination, because it is difficult to define and harder to be controlled and treated. It may also last for years or decades. Deveh Spring area is an agricultural area in Lattakia. It suffers from many environmental problems, so, it is very important to assess spring water vulnerability using DRASTIC and create water vulnerability assessment map by GIS. The map showed that the recharge water to Deveh Spring has a high and moderate vulnerability to contamination. The area of high vulnerable groundwater zone is (82Km2), which is about (48%) from the whole study area. The area of moderate vulnerable groundwater zone is (40Km2), which is about (23%) from the whole study area. Sufficient actions must be taken to protect water from contamination, through the integrated management of groundwater resources.