1985 Ed.]
Building (Construction) Regulations
[CAP. 123
172. (1) A weep hole, with an internal diameter of not less than 75 mm, shall be provided to every 3 m2 of the face of every retaining wall:
Provided that weep holes may be omitted in retaining walls-
(a) constructed of masonry built dry; or
(b) designed to withstand maximum potential hydraulic pressure;
(c) with adequate subsoil drainage behind such retaining wall to carry away subsoil water.
(2) Where on or after the date* on which the Building (Construction) (Amendment) Regulations 1981 come into operation a drainage system is incorporated in a retaining wall to reduce any water pressures that may be imposed on the back face and on the base of the retaining wall, such drainage system shall be designed and constructed so as not to be rendered ineffective during service by the penetration of soil or due to any other cause.
173. (1) Every retaining wall shall be provided with a proper coping of concrete or such other materials as the Building Authority may approve.
(2) (a) Where the ground at the top of any retaining wall or portion of the wall is accessible and is more than 600 mm above the ground level at the foot of the walls or portion of wall, parapet walls or railings not less than 1100 mm in height from top of coping level shall be provided.
(b) Such parapet walls or railings shall be so constructed as to inhibit-
(i) climbing; and
(ii) the passage of articles more than 100 mm in their smallest dimension.
(c) The lowermost 150 mm of such parapet walls or railings shall be built solid.
B 113
[Subsidiary] Weep holes. L.N. 294/76.
L.N. 36/81. (*L.N. 76/81)
Copings and parapets.
L.N. 294/76.
174. Adequate channels laid to suitable gradients, or paving in accordance with the provisions of regulation 41 shall be formed at the top and toe of every retaining wall to carry away stormwater, seepage, or other surface water.
PART XV
WELLS
175. No well shall be sunk or reopened without the permission of the Building Authority.
Permission from Building Authority to sink or reopen wells.