الفهرس 
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Abstract
SUMMARY AND CONCLUSION
The study aimed at assessing the water and land resources of the. Man-Made River Project at Sirt and Benghazi, The main objectives were realized through:
1- Evaluation of water resources of the Great Man-Made River of Sarir-Sirt / Tazerbo-Benghazi System.
2- Conducting a database using GIS.
3- Evaluation of soils in the target in vestment areas. The main findings of this research are:
• Water analysis indicated that Sarir-Sirt / Tazerbo-Benghazi System water is worth mentioning that when mixing the water of Tazerbo wells field with that of Sarir wells field in a proportion of 1:1, it was revealed that this water is appropriate chemically for drinking arid it conforms to the standard specifications and criteria of drinking water.
The water analysis also indicated that the mean salinity value of irrigation water was around EC 0.90 -0.94 dS/m. In general, the SAR mean value was around 3.28 ^ 74 %. There is no potential restriction on water use due to boron and nitrate concentration. The water was assessed according U. S. Salinity laboratory staff method (1954)(53) and furthere evaluated according to the guidelines of water quality for irrigation FAO (1985)(45). The assessment showed that all irrigation water classified according to the American salinity laboratory’s scheme on the water system of (Sarir-Sirt / Tazerbo-Benghazi). From the electrical conductivity value and sodium adsorption ratio (SAR) data, it is clear that this water system lies among the kind of (C3S!) ”’high saline low sodicity water”. This means that water is not suitable for sensitive crops especially the citrus trees. It is suitable for use only in good permeable soils. The application of the FAO’s guidelines to evaluate the irrigation water quality of the (Sarir-Sirt / Tazerbo-Benghazi) water system f rom the results of water analysis listed in the Salinity