Establishment of a baseline and preparation of technical specifications for the implementation of a performance based contract for the reduction of non-revenue water

Integrated assessment of non-revenue water of the drinking water supply system of Dar-es-Salaam and preparation of an action plan to reduce non-revenue water from 60% to 45%.

The study includes:

Study of the distribution network, evaluation and reduction of non-revenue water in 10 pilot areas (120 km of network)
Preparation of a water balance (method IWA) and development of an overall strategy to reduce non-revenue for DAWASA/DAWASCO (respectively Water Authority and the network operator)
Preparation of the terms of reference and the tender documents for a performance based contract

Project execution dates

from July 2010 to November 2011
Localization

Dar-es-Salaam / Tanzania
Expertise domains
- Commercial optimization
- Technical optimization

Description of the WMI service

Supply of leak detection equipment, flow/pressure measurements, data loggers, meters and test bench (DN 15 – DN 50)
Sectorization and “Step Testing” in 10 pilot areas (120 km)
Flow/pressure measurements
Leak repairs and rehabilitation of the network
Evaluation of the accuracy of the metering and the consumption patterns
Testing of 400 meters on test bench
Control pressure program
IWA water balance on the all Dar-es-Salaam network
Preparation of action plan for the reduction of non-revenue water
Preparation of specifications for a performance based contract

Key Results

Non-revenue water assessment at a citywide scale
Detailed 3-year non-revenue water plan established
Establishment of specifications for a performance based contract

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