water sens i t ive urban des ign technical features

This paper explores the potential for greywater reclamation by the Ecological Sanitation (ECOSAN) approach in the unsewered city of Kuching, Sarawak, Malaysia. Blackwater is dealt with separately by septic tanks. By recycling purified greywater for toilet flushing, outside use and irrigation, the pollution caused by current discharge of greywater to street drains is eliminated. A nine-dwelling pilot trial was successful. Modelling for blocks of up to 200 dwellings has shown potential water saving of about 40 % with attendant cost savings. The Wallingford Software model, InfoWorks Water Supply (WS) was employed to carry out a mathematical modelling of a hypothetical greywater recycling system as an integrated part of the Kuching urban water supply