Consultancy services for nrw reduction, hydraulic modelling and gis development

The scope of this project was the development of a coherent framework of principles and practices, established in international practice, for reducing AAWSA overall Non Revenue Water (NRW) from a current level of about 36% to 40% to a level of 20% by the year 2020. Addis Ababa and its surrounding areas had population estimated to about 3.5 million inhabitants. A significant aspect of this project within the overall scope was also the Capacity Building of AAWSA personnel. In this sense, the project also aimed to provide to all AAWSA organizational levels (NRW Task Force, Development, GIS, Operation and Maintenance and Accounting Departments) the means and the ability to continuously evaluate and implement future schemes of cost effective NRW management.Ten pilot District Metered Areas each including approximately 800-1200 customers were proposed. Zero pressure tests were performed to test DMA watertightness and the Active Leakage Control was carried out using listening sticks, leak noise correlators and ground microphones. DMA Minimum Night Flow analysis was carried out using available field data. A program of individual consumer demand monitoring of sampled customers was implemented for use in the Minimum Night Flow Analysis.