Warrington Township in Pennsylvania, US, is home to 25,000 residents and over 375 businesses. The township’s water comes from seven wells and five interconnections from another water supply district.
In total, there are five district metered areas (DMA) with dedicated pressure zones to effectively serve customers in each zone by providing consistent pressure flow. One of the pressure zones also has an elevated tank.
Due to a contaminant entering the groundwater from a military base in a neighbouring municipality, Warrington was required to discontinue the use of its wells.
This placed more demand on the supplemental interconnections to now fully feed those areas previously supplied by the well system.
Through a cooperative agreement with the Department of Defence, Warrington installed two additional interconnections.
The change in the water supply to the township’s system resulted in fluctuating pressure that the mechanical control valves were designed to respond to in order to maintain constant pressure in the DMA.
With so many fluctuations, when one control valve changed, it would cause other...
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