Case
Non-revenue water
Water management
Water supply
Envidan specializes in environmental solutions within water resources, water supply, climate, energy and waste water. Envidan has been on the market since 1995, and has build up an significant experience and knowledge in the environmental sector.
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The City of Larvik has a customer base of 39,000 people. Larvik is also a popular holiday destination. Larvik has several pressure zones, gravity supply reservoirs and pumping stations. The distribution system has eight major districts, subdivided into 20 DMAs with 35 district meters. During the summer of 2018, the municipal water treatment plants had difficulty meeting demand.
The city decided to implement KeyZones monitoring system that consists of intensive data collection and systematisation of data. Operational within six weeks, the system gathered metered data from the past two years for reference for initial analysis of the KPIs. At the handover of the KeyZones system, initiatives and methods for active NRW optimisation were highlighted and suggested based on the DMAs with the highest potential for NRW-reduction.
A 20-25 cubic metres/hour leak with six months runtime was found after one week. Another leak of 35-40 cubic metres/hour with five months runtime was also identified and consequently repaired. The investment costs for implementing KeyZones were, despite the low water price, recouped through the repair of those leaks. Further initiatives such as changes to pressure zones were implemented, enabling Larvik to reduce the ILI from 5.0 to 2.5 within six months.
This case is part of our publication ‘Reducing urban water loss’.
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