As per design criteria adopted in AJ&K and Punjab Province in Pakistan 80% of the water supplied is taken as sewage generated from households and other consumers. Therefore, 20% of the maximum day water demand i.e. 65,000 gpd, give rise to 52,000
gpd of sewage flow from the entire area of C3 Colony. An appropriate external sewerage system comprising of RCC sewers of 9” diameter (min) and above as per hydraulic design with 2.0 to 2.5 ft/second minimum self-cleansing velocity of flow will be designed and provided with allied appurtenance for trouble free service, operation and maintenance. Sewage will be given anaerobic treatment through community septic tanks of appropriate size before ultimate disposal in to Agar Nullah flowing along southern side of C3 Colony across approach road going to the Power House site. The effluent coming out of septic tanks shall be afforded with further bacterial treatment by natural process of meeting the BOD and dilution of the organic and biodegradable residual load with the rapids generated in water flows due to steep bed slope of Agar Nullah and ultimately in the River Jhelum.
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