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Establishing and Operating ECOSAN System in New and Existing Residential Areas72 Cost of ECOSAN SystemImplementing ecological sanitation based on local treatment of grey water and localstorage of black water for transport by tanker-trucks for centralised recyclingrequires a number of decisions to be taken. Different methodologies and costingconsiderations will be required for existing built-up urban areas and newdevelopments, respectively. In the following Chapters, the different approaches aredescribed.The dimensions of ECOSAN systems for different sizes of housing schemes areshown in Table 2.1. Figure 2.1, Figure 2.2 and Figure 2.3 show the typical layoutplan for the ECOSAN treatment system in different size housing areas.Table 2.1: Summary of ECOSAN System for Different Size Housing AreasHousingAreaNo. ofHousesPopulationEquivalent (PE)Black watergeneration(M 3 per day)Grey watergeneration(M 3 per day)Small 20 100 1.20 14.00Medium 100 500 6.00 70.00Large 200 1000 12.00 140.00The estimated volume of black water and grey water per day is after the installationof low flush toilets.UEMS_TEC_02_53_Final ECOSAN Costing Report_280905.