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Establishing and Operating ECOSAN System in New and Existing Residential Areas314.4.2 Capital Costs for Grey Water System per PEIn order to make comparisons between different sewerage systems the above capitalcosts for different grey water schemes have been translated into both capitalcosts per PE and capital costs per PE per day as shown in Table 4.4.Table 4.4: Annual Capital Costs per PE (RM)DescriptionSize of Housing Scheme100 PE 500 PE 1000 PEAverage Annual Capital Costs 1 7,690 26,945 42,474Capital cost per PE per day 0.21 0.15 0.13Capital Cost per PE 935 655 516Note: 1 Assuming 20 year life and discount rate of 6 percent p. a.The capital costs per PE show a rapid decline from the smallest scheme cateringfor 100 PE to a scheme catering for 500 PE. There are further economies of scaleas costs per PE are reduced by 20 percent if the scheme is doubled to cater for1000 PE.4.5 Operating CostsOperating costs for grey water system at existing housing areas are same as fornew housing areas in Table 3.10.4.6 Summary of ECOSAN Costs for Existing HousingEstates4.6.1 Capital CostsThe capital cost of developing an ECOSAN system for existing housing estates ofvarious sizes is shown in Table 4.5.UEMS_TEC_02_53_Final ECOSAN Costing Report_280905.