Project Overview

The project comprised the design and construction of a 3,500m² reinforced concrete twin cell reservoir structure (14,500m³ capacity), seven metres in depth, including an adjoining pumping station which is 0.5m deeper and with gross floor are of 530m². The site had a water table that was one metre below existing ground level, necessitating the installation of 350 CFA piles to act as anchors to resist uplift. The overall excavation volume was 20,000m³, which consisted mainly of black boulder clay and rock. 3,300m³ of concrete and 460- tonnes of reinforcement were required in the structure.

The roof of the reservoir is made up of a post-tensioned concrete slab roof system.

A 530m² above ground building was constructed over the pumping station to house all M&E equipment, including providing general and welfare facilities during the operation of the plant. The M&E element of the project was substantial and comprised duty and standby potable and fire pumps, chlorination and UV treatment and a SCADA management system. 2km of DI rising and distribution pipelines 250mm to 450mm in diameter (including 80m of trenchless pipe) were constructed off-site through public roads, fields and car parks, including tie-ins to existing water supply pipelines.