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Utrecht University (2019)

The impact of an intermittent water supply on water losses : A case study on water distribution systems in Nairobi, Kenya

Robroek, S.

Titre : The impact of an intermittent water supply on water losses : A case study on water distribution systems in Nairobi, Kenya

Auteur : Robroek, S.

Université de soutenance : Utrecht University

Grade : Master 2019

Résumé
Intermittent water supply (IWS) affects around one third of the customers with a household connection in Africa. It causes air to enter the piping system and creates a hydraulic shock that has a detrimental effect on water meters, pipes and joints. This study was conducted to assess these effects in relation with a utility’s water losses. This was done by examining two different water supplies in the city of Nairobi were water losses are at 40%. 14,218 pipe-related incidents were collected from a continuous water supply and an intermittent water supply between January 2014 and January 2019. To examine the effects on water meters, 40 samples were taken within the two different water supplies and water meters were tested on their measuring accuracy at the utility’s test-bench. Nairobi has a predictable intermittency, were piped water is allocated according to schedule. During the examined period, there was a minor pattern found in the pipe-related incidents. Water leaks were reported slightly more in CWS, whereas water interruptions were reported slightly more in IWS. Water meter problems were reported more in IWS. Water meters were found to experience under- registration in IWS with a weighted error of -4.7%. This has led to increased water losses in IWS. Including leaking water meters, the weighted error was found to be higher (-14.2%). The utility could improve their water meter assessment to reduce water losses. Intermittent water supply appears to increase water meter inaccuracies. However, the effect on pipe degeneration is not proven. Data management may improve efficiency of water meter testing and leakage assessment.

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Page publiée le 8 avril 2021