Utilization of Sebha Treated Sewage Water to Protect Sebha- Brak Road against Sand dunes movement's
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Acacia Tortilis, Water Consumption, Sand Soil, PE Pipes, EPANET Program.
Abstract
Sebha is one of the cities in the south of Libya. The city depends on the ground water for the agricultural, industrial and domestic needs, and part of these needs become waste water. 60-70% of the used water for industrial and domestic needs is treated sewage water. Treated sewage water is pumped to a collecting tank, then drained directly to a big pond. The pond size has been increasing year by year until it has reached 79ha with depth of 3-4m in 2011. This water can be used in the irrigation of windbreaks and helps in stabilization of sandy dunes beside the road (Brack-Sebha) that connects the southern and the northern cities in Libya. Therefore, a field experiment has been designed to assess the effects of irrigation with sewage water on the growth of Acacia. After the chemical analysis of the water, 30 plants were divided into 5 groups. The plants were irrigated with 4 levels of the sewage water (25, 50, 75, and 100%) for 7 weeks. A statistical analysis was carried out to compare the treatments in terms of growth parameters. The results showed no significant differences between level 1 and level 2. The planned area for afforestation is 16000m away from the collecting tank which is located in the north of Sebha and receives daily 31500 m3 of water from the sewage station. Because of that, a tube with diameter of 710 mm was designed along the main road. The tube was designed to carry water and irrigate areas of windbreaks planted on both sides of the road.
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