FP McCann Precast Concrete Storm Overflow Tank Installed At North Yorkshire Sewage Treatment Works

Project: Stormwater Attenuation Tank Extension, Tadcaster STW, North Yorkshire.

Client: Yorkshire Water

Civils Framework Contractor: Seymour Civil Engineering

Tank Installation Contractor: FP McCann (Beresford Flooring)

Products Supplied: Precast Concrete StormTank

FP McCann has designed and installed a 315m3 precast concrete StormTank extension on behalf of client Yorkshire Water and project contractor Seymour Civil Engineering at Tadcaster Sewage Treatment Works (STW). The FP McCann StormTank extension is part of Yorkshire Water’s £180 million drive to reduce the frequency of stormwater overflows from its drainage network.

Sited alongside and configured to the existing online attenuation tank, the extended tank’s capacity is designed to further alleviate flood risks in line with climate change conditions and stormwater surge events within the treatment works.Sited alongside and configured to the existing online attenuation tank, the extended tank’s capacity is designed to further alleviate flood risks in line with climate change conditions and stormwater surge events within the treatment works.Sited alongside and configured to the existing online attenuation tank, the extended tank’s capacity is designed to further alleviate flood risks in line with climate change conditions and stormwater surge events within the treatment works.

FP McCann’s StormTank is amongst a number of attenuation systems that are now accepted by Yorkshire Water and adoptable under the S104 approval process within Water UK’s Sewer Sector Design and Construction Guidance.
StormTank is part of the FP McCann multi-purpose precast concrete tank range and can be designed and installed up to 6 metres high with overall dimensions to suit the client brief.
Measuring 23.4 metres long by 12.6 metres at the widest point, the Tadcaster STW StormTank extension manages a storm event by capturing excess combined wastewater. The wastewater can then be released into sewage treatment works for processing at a controlled rate, thereby relieving the pressure on the wastewater management system and reducing the risk of overflows from the network.
The StormTank extension designed as water class tightness 1 has been constructed using 15 individual 2.28 metres high steel reinforced ukprecast concrete wall panels sections each 350mm thick with a heel and toe foundation base. Wall panel lengths range from 3.275 metres to 4.542 metres. To meet Yorkshire Water’s benching profile the open tank has been designed with a stepped floor. One side of the tank is out of the ground with the other three sides backfilled and fitted with a surrounding safety handrail.
The precast concrete wall sections were positioned on the base foundation and a 350mm thick C40 concrete insitu tank floor slab was cast. The stepped floor was formed with a further 150mm thick concrete layer. The panel sections manufactured at McCann’s state-of-the art precast facility in Byley, Cheshire were delivered to site over a period of 3 weeks for installation by the approved FP McCann specialist fixing team, Beresford Flooring Ltd.In conjunction with Seymour Civil Engineering and Yorkshire Water’s design consultants, FP McCann value engineered the precast concrete tank system into the designated footprint by demonstrating increased performance and cost efficiencies over other considered tank extension options.

Commenting on the StormTank extension design and build, Joel Rothery, Contract Manager for Seymour Civil Engineering says, “We had to take into consideration a number of factors on the tank design. Robustness and long-life, low maintenance performance were key to our choice of attenuation tank. Having looked at and considered carefully a few options, FP McCann’s StormTank fitted both the design and performance criteria. The McCann approved install team undertook the work in a timely, efficient and safe manner. This is the fourth StormTank system that FP McCann has designed and installed on our behalf and we will certainly consider StormTank on any future similar projects.”

FP McCann’s 100-year design life StormTank™ can be installed up to 6 metres high with no footprint size limitation and are designed for pedestrian loading through to LM1 highway loading. Internal design features can be added such as weir and baffle walls and penstocks or flap-valves can be pre-installed. It is a multipurpose panel system with a variety of uses, including:

•Attenuation Tank

•StormBrake™ Chambers

•Pumping Stations

•Large CSO Chambers

•ASP Structures

•Basements

•Clean Water Storage Tank

For sales and technical enquiries, contact
Igor Skoro on 07860 204893 or email iskoro@fpmccann.co.uk