الفهرس 
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Abstract
The study area occupies the northern central part of Jifarah plain west Tripoli. It is nearly flat and the land surface slopes generaly towards the sea. The area is occupied by rock units ranging in age from Late Miocene to Recent.
The Quaternary aquifer is one of the main water-bearing formations in Jifarah plain. The groundwater situation was discussed through data obtained from 55 produced drilled wells.
In order to achieve the assessment of the groundwater system in the study area, hydrogeological, hydrogeochemical studies on basis of a complete integrated basin analysis had been carried out. This included the geological setting of the basin sequence, the geomorphological and structural analyses, petrographical analysis, depositional facies, palaeo-depositional environments and basin models. These studies depended mainly on surface and subsurface well data for the aquifer bearing basin.
The Quaternary aquifer is composed of sandstone, sandy limestone intercalated with limestone, clay, silt and marl. The thicness of the investegated aquifer differs from place to another with a maximum thicness of about 225m. The maximum saturated thickness of this aquifer reaches up to 100m. The groundwater of this aquifer has been suffering from a series of declines in the water levels through fifty years ago. The groundwater of the Quaternary aquifer occurs under free water table conditions. The water table of this aquifer is controlled by the slope of ground surface and pumping rates. Generally, the direction of the groundwater flow of this aquifer occurs northward. The hydrogeological properties of the Quaternary aquifer are totally controlled by the nature and characters of the bearing basin.The study area is found suffering from severe decline in the water level during the last fifteen years due to the over_pumping rates.
The groundwater chemistry of the Quaternary aquifer is highly influenced by their bearing facies and sea water intrusion. The water salinity of this aquifer varies from fresh to brackish classes. The dominant water types are Na2SO4 and NaCl. Most of the groundwater of the study aquifer is found suitable for drinking and irrigation purposes under normal conditions with some precautions.