To increase the resilience of Hereford’s water supply network, MMB was tasked with the design and build of additional treated water storage. This project involved a review of the existing storage network and the use of DCWW’s Risk & Value (R&V) process to determine the best overall outcome: a 34ML service reservoir adjacent to the existing reservoir at Bewdley Bank.

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The additional storage will increase the network’s ability to cope with fluctuations in demand and provide increased contingency in the event of a loss of source supply to the water treatment works.

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Optioneering

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Issued two intervention briefs, both for additional storage, we identified the measure of success was to increase network resilience, regardless of storage split between the two sites.

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The R&V was used to help select the best overall outcome. Being delivered as part of another scheme, a new 700mm trunk main from Bewdley Bank to Hereford meant that stored water at Bewdley Bank could supply a greater proportion of the network, which confirmed the best investment case.

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The resulting design and construction efficiencies from opting to invest at just one site has allowed for the construction of an extra 13ML of storage available to the network – equating to ~6 hours of additional network resilience.

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Procurement-based design

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Procurement-based design drove efficiencies throughout:

1. Determine need – what is the root cause of the problem and what do we need to construct to solve it?

2. Engage supply chain early – what is readily available and what are the limits within the supply chain?

3. Complete design - Complete detailed design to accommodate the products available in the market.

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