Libya as many other regions under arid climates suffer from inadequate water resources to cover all the needs of this rapidly developing country. Increasing water amounts for population supply, agricultural irrigation and use for industry are needed. As groundwater is the main water source in the country it represents a natural resource of the highest economic and social importance. FEFLOW numerical model was implemented in a regional scale to show how the natural situation has been changed after heavy groundwater abstraction having occurred in the last decades in the northwestern part of Libya. Results of the numerical model indicated that the current zones of depression in piezometric surface could have been caused by smaller withdrawn amounts than previously estimated. Indicated differences in assessed withdrawn groundwater volumes seem to be quite high and might influence considerably the future possibilities of groundwater use in the study region.

The present paper discusses the hydro-environmental degradation of New Damietta City due to salinity and waterlogging. Forty-one water samples were collected and analyzed for various hydrochemical parameters. The majority of samples are enriched in chloride, sulfate, sodium, and magnesium (also, a chloride-sodium category dominates the majority of the analyzed samples). These data reflect that the marine origin plays a major role in controlling the groundwater composition. The shallow saline groundwater with high concentrations of both chloride and sulfate salts significantly affects the characters and accelerates the rate of concrete deterioration, particularly the reinforced concrete and underground utilities.

Groundwater is the main water source in Jifarah plain, northwestern Libya, which suffers from a continuous decrease in the piezometric head. This is due to the difference between aquifer recharge and amount of water drawn each year to meet the increasing needs of the population supply, agricultural and industry activities. These were study the design of the model is very close to the natural hydrological conditions in the reservoir.

Conceptual and numerical models were implemented in a regional scale to show change in the natural situation after the over-pumping, which occurred in the last decades. Results of the conceptual model indicated that the highest groundwater levels and the value of discharge per unit width of aquifers.