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Part A Img

Section 1

Drainage systems H1

(1) A building shall be provided with such a drainage system as may be necessary for the hygienic and adequate disposal of foul wastewater from the building.

(2) A building shall be provided with such a drainage system as may be necessary for the adequate disposal of surface water from the building.

(3) No part of a drainage system conveying foul wastewater shall be connected to a sewer reserved for surface water and no part of a drainage system conveying surface water shall be connected to a sewer reserved for foul wastewater.

  • Diagram 1 Branch connections to stacks

  • Diagram 2 Direct connection of ground floor wc to a drain

  • Diagram 3 Branch connections

  • Diagram 4 Branch ventilation pipes

  • Diagram 5 Termination of ventilation stacks or ventilating part of discharge stacks

  • Diagram 6 Stub stack

  • Diagram 7 Discharge capacities of foul drains running 0.75 proportional depth

  • Diagram 8 Bedding for rigid pipes

  • Diagram 9 Bedding for flexible pipes

  • Table 1 Flow rates for dwellings

  • Table 2 Minimum trap sizes and seal depths

  • Table 3 Common branch pipes (unvented)

  • Table 4 Minimum diameters for discharge stacks

  • Table 5 Materials for sanitary pipework

  • Table 6 Recommended minimum gradients for foul drains

  • Table 7 Materials for below ground gravity drainage

  • Table 10 Maximum spacing of access points in metres

  • Table 11 Materials for access points

  • Table 8 Limits of cover in metres for standard strength rigid pipes in any width of trench

  • Table 9 Minimum dimensions for access fitting and chambers

  • Table 1 Flow rates for dwellings

  • Table 2 Minimum trap sizes and seal depths

  • Table 3 Common branch pipes (unvented)

  • Table 4 Minimum diameters for discharge stacks

  • Table 5 Materials for sanitary pipework

  • Table 6 Recommended minimum gradients for foul drains

  • Table 7 Materials for below ground gravity drainage

  • Table 10 Maximum spacing of access points in metres

  • Table 11 Materials for access points

  • Table 8 Limits of cover in metres for standard strength rigid pipes in any width of trench

  • Table 9 Minimum dimensions for access fitting and chambers