Abbotts Flood Alleviation Project - including micro- tunnelling and underground storage tank – Clancy Docwra Description: Flood prevention project including micro-tunnelling and underground storage tank in Abbots Road, Leigh Road, and High Road Leyton. Completed in partnership with Barhale under the Optimise Alliance. Challenges: Large children’s playground and tennis courts within the park. First time a system from Carlow Precast has been used on a Thames Water Capital Deliver Scheme. Tank cofferdam of 45m x 12m x 4.5m deep.Key achievements and innovations: Open cut techniques used to install 300m of new 300mm and 375mm sewer in roads. Tunnelling used to create 176m of 600mm underground micro-tunnel. Pre-cast storage tank brought in sections (over 100) from Ireland, with piles foundations

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