Part of Severn Trent Waters e5 Major Projects Programme, Rushmore STW is a strategic centre for sludge digestion, de-watering and cake storage. Due to expected growth in the local population the PSTs would need refurbishment. A high water table below ground meant stability is constantly changing meaning tanks suffer uplift pressures when empty. Encouraged by the e5 programme a novel solution was proposed. Deckdrain 700S/NW8 was proposed as an uplift pressure reliever and under slab drainage. Deckdrain has a filtration layer and is virtually impermeable. Deckdrain structure exceeds the drainage capacity of 500mm stone giving significant cost savings.
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