Esholt Wastewater Treatment Works

Esholt Wastewater Treatment Works

ESL were engaged for the concept design of new storm tanks at Esholt, Yorkshire’s largest wastewater treatment works.

Barhale was tasked with the design and build of additional storm volume capacity to meet 26,194m3 regulatory storm volume requirement, whilst ensuring the site remained available at short notice for use in storm events.

The initial solution was a single option development creating additional storage with a new tank adjoining existing tanks and operating under gravity. Due to structural requirements for the 60m x 30m tank, estimates exceeded the cost model.

A collaborative approach with Yorkshire Water and a structural and hydraulic assessment identified additional capacity in existing tanks to raise weir levels by 500m, enabling development of a much smaller additional tank.

Existing asset optimisation and minimised new build with optimised buildability became the solution.

ESL designed new 26m weir plates and scum boards using a DFMA approach that was;

Mindful of existing aging assets
Optimised for road transport
Enabled ease of installation for high buildability
Maintained availability of tanks at short notice in case of storm events

We also designed a new reinforced concrete tank adjacent to existing assets to deliver final 1712m3 capacity.

Collaboration with Yorkshire Water Operations set localised isolations and tank access at low storm risk to minimise cancellation and mitigate costs and environmental impact of long periods of high volume over pumping.

Collaborative design challenge and buildability optimised the design;

The tank was repositioned and base designed to remove the need for piling and reduce costs.
Tank positioned to optimise cut and fill, reduce material removal during excavation and reduce costs on temporary shoring and material handling.
Landscaping around tank reduced material disposal costs and removed existing trip hazards