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The NSC is further calling for increased vigilance by parents and pool/spa owners. They suggest precautions such as four-sided fences for pool/spa areas, alarms on all doors accessing pool/spa areas, heavy duty pool covers, anti-entrapment drains and close supervision of children near pools/spas. [12]
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
All commercial pool cleaners are electric robotic and can range in price from a little over $1,000 to upwards of $15,000. They closely resemble residential models but in addition to their addition size, they are made with heavy-duty components, more sophisticated computer guidance, and on-and-off systems.
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The structure is constructed to resist the lateral pressure of soil when there is a desired change in ground elevation that exceeds the angle of repose of the soil. [ 1 ] A basement wall is thus one kind of retaining wall; however, the term usually refers to a cantilever retaining wall, which is a freestanding structure without lateral support ...
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