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| Product |
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Terraforce |
| Client |
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Bovis Homes |
| Contractor |
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E.J. Taylor & Sons |
| Project |
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Flood protection |
| Wall Height |
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2.2 metres |
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As part of a new housing development being undertaken by Bovis Homes, it was discovered that a small stream skirting around the site regularly flooded the gardens of the new houses and therefore required protection from being inundated.
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The geology of the site consisted of in-situ weathered London Clay.
Solution
A Terraforce faced earth bund was proposed which was 59m in length and reached a maximum height of 2.2m on the downstream side and 0.8m on the upstream side with a total face area of 187m squared.
The hollow Terraforce blocks in combination with geotextile reinforcement enabled a robust solution to protect from surface scour, whilst enabling the establishment of a vegetated finish. |
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Construction
Construction of the Terraforce block bund involved the placement of a concrete levelling strip where the first row of blocks were placed and aligned. The blocks were orientated such that the curved face was facing outwards to enable maximum planting space within the hollow blocks which were raked back at a 65° from horizontal angle.
A drainage pipe was positioned behind the third level of blocks above the "normal" stream level to intercept any groundwater from the gardens behind. The blocks below normal stream level were infilled with a lean mix concrete and the courses above filled with a good quality topsoil. Layers of geotextile were trapped between every 2nd block
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| vertically and were encapsulated in a well graded granular fill. |
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