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Donegan Civil Engineering

Caisson Detention Tank – Tewkesbury Drive, Lytham St Annes

A 15.00m diameter caisson detention tank taking eleven homes off the flood register

By: Valentine Donegan

Published: August 6, 2026

Caisson Detention Tank - Tewkesbury Drive, Lytham St Annes

Client: United Utilities

Project Description / Main Operations

V J Donegan & Co Ltd were appointed as main contractor on this United Utilities project. The works centred on a 15.00m diameter shaft, sunk by caisson to approx. 15m deep, converted into a detention tank to store storm water during times of heavy rainfall, preventing flooding of the local area and taking a total of 11 local homes off the flood register.

Scope and method:

Construction of a 15.00m diameter shaft, sunk by caisson to approx. 15m deep, and its conversion into a detention tank.
Construction of an in-situ reinforced concrete discharge chamber and weir chamber.
Upsizing of approx. 250m of the local sewer network with pipes ranging from 300mm to 750mm diameter, complete with 9 manhole chambers, followed by abandonment of the existing sewers.
Laying of a permanent grass paving system for HGV access across the entrance and around the new underground detention tank.

For More Information, contact us at http://www.donegan.co.uk

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