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W.M.I. - Water Management International

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

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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