Waste construction minimisation through design: New Tredegar flood alleviation

About the report

This free report is a design review to identify waste minimisation opportunities in a flood alleviation scheme in South Wales, UK.

Published March 2008
Pages 27

This report was funded by WRAP.
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Overview

A design review of the Environment Agency’s New Tredegar Flood Alleviation Scheme in South Wales has been conducted to facilitate the actions required to adopt appropriate waste minimisation design solutions to deliver waste savings within the project.

New Tredegar is situated on the River Rhymney, 20 miles north of Cardiff. Flooding from the River Rhymney affects private houses, sheltered accommodation for the elderly and the only leisure facility available to the community. Following a detailed feasibility study a flood alleviation scheme is proposed for the village to increase the standard of flood defence from a 33% (1 in 3) annual chance event to a 1% (1 in 100) annual chance event. The scheme comprises of raising Birchgrove bridge and constructing raised defences throughout the low lying areas through a combination of sheet pile and reinforced concrete flood walls. The overall project cost was calculated to be £4.4m, with construction accounting for £2.6m.

An initial assessment of the project highlighted that the biggest opportunities for waste minimisation came through the concrete flood defence walls of the scheme. The flood defence walls proposed are typical of many Environment Agency (EA) flood alleviation projects, solutions devised for this scheme could be applicable to many other EA schemes. The analysis in this case study focuses only on the concrete flood walls and facing brickwork.

The estimated cost of the four main construction materials used; concrete, formwork, reinforcing steel and brick facing for the concrete flood defence walls of New Tredegar flood alleviation scheme will be £198,940. Using the proposed construction approach it is anticipated that 2,630 tonnes of materials will be ordered, of which 360 tonnes will be wasted.

This report was funded by WRAP.
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