EIA Study- Final Report-May 10 - UNDP

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Environmental Impact Assessment Khan Younis Wastewater Treatment Plant May 2010 The second option is the coastal infiltration area near the sea beach. The area elevation ranges from 12m to 15m above MSL and is located 17 km from KY WWTP site. In addition, total area of this site is insufficient for infiltration of KY WWTP effluent volumes. (Figure 4.5) Figure 4.5: Coastal infiltration area (Temporary lagoons) Khuza'a (Al Fukhari) site is the third proposed location. Al Fukhari infiltration site has available top area of (97,000 m2) with a trapezoidal shape. The top soil consists of sandy silty clayey layer with thickness between 1 to 5m above clay layer with thickness between 2 to 3 m. Thus; infiltration basins can't be constructed directly on the ground. The clay layer will be excavated an removed from the site, then the basins will be backfilled by suitable soil with high hydraulic conductivity until reach the design level of each basin. Figure 4.6: Recent photo for Khuza'a (Al Fukhari) infiltration area SOGREAH/UG CONSULTANTS 48
Environmental Impact Assessment Khan Younis Wastewater Treatment Plant May 2010 Figure 4.7: Location of Khusa'a (Al Fukhari) infiltration area This option is finally selected by the consultant and the client after the analysis of detailed geotechnical investigation. The infiltration rates and hydraulic loads for Al Fukhari site is shown in table 4.6. The loading cycle system that will be taken is to operate 2 days for flooding and 4 days for drying. Table 4.6: Infiltration rates and hydraulic loads for Al Fukhari site. year Average inflow Hydraulic load Infiltration rate (m3/day) (m3/m2/year) (m/day) 2010 13,905 75 0.62 2015 21,673 117 0.97 2018 26,664 143 1.19 The hydraulic load of Al Fukhari infiltration basins is sufficient until 2018 (Phase 1). After 2018, the infiltration area has to be extended to reach the same hydraulic load. 4.4. Emergency Sea outfall According to the final report of KY WWTP-Geotechnical and Hydrological Study for the infiltration system (ALMADINA-Consultants, September 2006), and based on the Consultant joint meetings, discussion, and sites visits with UNDP, Land Authority and Khan Younis Municipality representatives, several scenarios for this pressure line routes SOGREAH/UG CONSULTANTS 49
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EIA Study- Final Report-May 10 - UNDP

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