Surface Water Drainage.pptx - DESIGN a b c d e f g LAYOUT DEPTH OF PIPES PIPE DRADIENTS SIZES MATERIALS FOR PIPES JOINTING BEDDING BACKFILLING CLEARANCE

Surface Water Drainage.pptx - DESIGN a b c d e f g LAYOUT...

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DESIGN a) LAYOUT b) DEPTH OF PIPES c) PIPE DRADIENTS & SIZES d) MATERIALS FOR PIPES & JOINTING e) BEDDING & BACKFILLING f) CLEARANCE OF BLOCKAGES g) WATERTIGHTNESS
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LAYOUT The layout of the drainage system should be kept simple. Changes of direction and gradient should be minimised and as easy as practicable. Access points should be provided only if blockages could not be cleared without them. Connection of drains to other drains or private or public sewers, and of private sewers to public sewers should be made obliquely, or in the direction of flow. Connections should be made using prefabricated components. Where holes are cut in pipes a drilling device should be used to avoid damaging the pipe. Where connections made to existing drains or sewers involve removal of pipes and insertion of a junction, repair couplings should be used to ensure a watertight joint and the junction should be carefully packed to avoid differential settlement with adjacent pipes
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Sewers (serving more than one property) should be kept as far as is practicable away from the point on a building where a future extension is likely (e.g. rear of a house, or side of house where there is room for a side extension). The system should be ventilated by a flow of air. A ventilating pipe should be provided at or near the head of each main drain. An open ventilating pipe (without an air admittance valve) should be provided on any drain fitted with an intercepting trap (particularly on a sealed system), and on any drain subject to surcharge. Ventilated discharge stacks may be used. Ventilating pipes should not finish near openings in buildings Pipes should be laid to even gradients and any change of gradient should be combined with an access point
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Pipes should also be laid in straight lines where practicable but
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