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(Cap 123 section 38) [1 January 1960](G.N.A. 76 of 1959) Cap 123I reg 1 Citation PART I PRELIMINARY These regulations may be cited as the Building (Standards of Sanitary Fitments, Plumbing, Drainage Works and Latrines) Regulations. Cap 123I reg 2 Interpretation In these regulations, unless the context otherwise requires- "anti-syphonage pipe" (反虹吸管) means a pipe used or constructed to be used for the purpose of preventing loss of water seal from the trap of a soil fitment or waste fitment; "approved" (批准) means approved by the Building Authority; "cesspool" (污水池) means an underground chamber constructed to be used for the reception and storage of foul water; "chemical closet fitment" (化学处理厕所设备) means a latrine fitment in which the contents of the receptacle for excrement are treated by means of chemicals; "cinema" (电影院) means any building or part of a building which is designed for, and contains facilities (including a projection room) and projection or other apparatus or equipment for use in connection with or otherwise for the purposes of cinematographic displays; (L.N. 196 of 1996) "cleaning eye" (清理孔) means an access opening in a pipe; "foul water" (脏水) means any water contaminated by soil, waste or trade effluent; "latrine" (厕所) means a room used or intended to be used for the housing of latrine fitments; "latrine fitment" (厕所设备) means a fitment containing a receptacle for excrement, which is removable; "manhole" (沙井) means a chamber constructed on a drain or sewer to provide access thereto for inspection, testing and the clearance of obstructions; "nullah" (大沟渠) includes any trained streamcourse; "private sewer" (私家污水渠) means a sewer which is not a public sewer; "public channel" (公共渠道) means a channel vested in and maintained by the Government; "public sewer" (公共污水渠) means a sewer vested in and maintained by the Government; "rain water pipe" (雨水管) means a pipe used or constructed to be used for carrying off surface water directly from roof surfaces, verandahs and balconies; "septic tank" (化粪池) means a tank, for the reception of soil and waste from a building, in which the liquification of solid organic matter occurs; (L.N. 361 of 1980) "slop sink" (污水盆) means a sink used or constructed to be used for receiving solid or liquid excrement; "sludge" (污泥) means the layer of material settled to the bottom of a septic tank where reduction by anaerobic decomposition occurs; (L.N. 361 of 1980) "soil" (便溺污水) means the discharge from a soil fitment; "soil fitment" (便溺污水设备) means a watercloset fitment, trough watercloset, urinal, slop sink, bidet or any similar fitment; "soil pipe" (便溺污水管) means a pipe used or constructed to be used for carrying off soil; "sub-soil water" (地下水) means water occurring naturally below the surface of the ground; "surface water" (地面水) means rain water from any part of a building including any paved area or ground, whether paved or not, appurtenant to any building; "trade effluent" (工商业污水) means any liquid, either with or without particles of matter in suspension therein, which is wholly or in part produced in the course of any trade or industry; "waste" (废水) means used water from a waste fitment or similar fitment; "waste fitment" (废水设备) means a bath, lavatory basin or sink, other than a slop sink; "waste pipe" (废水管) means a pipe used or constructed to be used for carrying off waste; "water authority" (水务监督) and "waterworks" (水务设施) have the meaning assigned to them by section 2 of the Waterworks Ordinance (Cap 102). (L.N. 62 of 1966) Cap 123I reg 3 Interpretation of Part II PART II STANDARDS OF SANITARY FITMENTS In the regulations in this Part, unless the context otherwise requires- "factory" (工厂), "mine" (矿场) and "industrial undertaking" (工业经营) have the meaning assigned to them by section 2 of the Factories and Industrial Undertakings Ordinance (Cap 59); "habitable space" (可居住空间) means the aggregate of the areas of the floors in a building, excluding kitchens, staircases, staircase halls, lift landings, the space used in providing the watercloset fitments, urinals and lavatory basins, required, by this regulation, to be provided, and any space occupied by machinery for any lift; "living room" (起居室) means any room intended or adapted as a place for cooking or sleeping; "public dance hall" (公众舞厅) means any place opened, kept or used for the purpose of dancing, to which the general public is admitted, with or without payment for admission; "residential building" (住宅建筑物) means a domestic building, but does not include any hostel, dormitory or other room or premises provided for housing or lodging some or all of the pupils of any school out of school hours, whether such hostel dormitory or other room or premises is in or is part of the same building or group of buildings as the classrooms in the school or not; (73 of 1983 s. 3) "school" (学校) has the meaning assigned to it by section 3 of the Education Ordinance (Cap 279) ; "tenement house" (唐楼) means a building in the domestic part of which any living room is intended or adapted for the use of more than one tenant or sub-tenant; "usable floor space" (实用楼面空间) means the aggregate of the areas of the floors in a building, excluding any staircases, staircase halls, lift landings, the space used in providing the watercloset fitments, urinals and lavatory basins required, by this regulation, to be provided, and any space occupied by machinery for any lift, air-conditioning system or similar service provided for the building. (L.N. 196 of 1996) Cap 123I reg 4 Residential buildings (1) Save as provided in paragraph (2), in every residential building- (a) where separate waterclosets are not provided for male persons and for female persons, the number of watercloset fitments provided shall be not less than the number specified in Table I; (b) where separate waterclosets are provided for male persons and for female persons, the number of watercloset fitments provided for female persons shall be not less than the number specified in Table II and the number of watercloset fitments provided for male persons shall, save as provided in paragraph (c), be not less than the number specified in Table III; (c) where separate waterclosets are provided for male persons and for female persons and urinals are installed for the use of male persons, the number of watercloset fitments and urinals for male persons shall be not less than the number specified in Table IV; (d) the number of lavatory basins and baths or showers provided shall not be less than the number specified in Table V. TABLE I No. of persons residing or likely to reside in the building No. of watercloset fitments 1-8 inclusive More than 8 1 2 and 1 additional watercloset fitment for every 15 such persons, or part thereof, over 20. TABLE II No. of female persons residing or likely to reside in the building No. of watercloset fitments 1-8 inclusive More than 8 1 2 and 1 additional watercloset fitment for every 15 such persons, or part thereof, over 20. TABLE III No. of male persons residing of likely to reside in the building No. of watercloset fitments 1-8 inclusive More than 8 1 2 and 1 additional such fitment for every 15 such persons, or part thereof, over 20. TABLE IV No. of male persons residing or likely to reside in the building No. of water closet fitments No. of urinals 1-12 inclusive More than 12 12 and 1 additional watercloset fitment for every 20 such persons, or part thereof, over 25. 1 2 and 1 additional urinal for every 20 such persons, or part thereof, over 25. TABLE V No. of persons residing or likely to reside in the building No. of lavatory basins No. of baths or showers 1-8 inclusive More than 8 1 2 and I additional lavatory basin for every 15 such persons, or part thereof, over 20. 12 and 1 additional bath or shower for every 15 such persons, or part thereof, over 20. (2) (a) In the case of a tenement house, water supply points may, subject to the provisions of sub-paragraphs (b) and (c), be provided in lieu of lavatory basins and baths or showers and, for the purposes of paragraph (1)(d), the provision of one water supply point shall be deemed to provision of one water supply point shall be deemed to be the provision of one lavatory basin and one bath or shower. (b) The number of water supply points so provided shall be not less than the number of lavatory basins required, by paragraph (1)(d), to be provided in the tenement house. (c) Such water supply points shall be provided in a separate compartment, not less than 0.75 square metre in area, or in a watercloset. (L.N. 294 of 1976) (d) For the purposes of this paragraph, any supply of water provided for a sink in any kitchen shall not be a water supply point.(3) The watercloset fitments or the watercloset fitments and urinals, as the case may be, provided in any residential building in accordance with the provisions of paragraph (1), and, where, in accordance with regulation 9, latrine fitments or latrine fitments and bucket urinals, as the case may be, are provided in any residential building, the same shall be situated in the building to the satisfaction of the Building Authority. (4) For the purposes of this regulation- (a) the number of persons residing or likely to reside in any residential building shall be determined by the Building Authority, and, in the case of tenement houses and barrack and dormitory accommodation, shall be so determined at the rate of one person for every 3.25 square metre of habitable space; and (L.N. 294 of 1976) (b) where separate waterclosets are provided for male persons and for female persons, the proportion of male persons to female persons residing or likely to reside in the building shall, unless the Building Authority is satisfied that the proportion is or will be otherwise, be deemed to be 1:1. Cap 123I reg 5 Offices, industrial undertakings and other places of work (1) Save as provided in paragraph (3), in every building used or intended to be used for the purpose of an office and in every industrial undertaking and other place of work- (a) the number of watercloset fitments and urinals provided for male persons employed or likely to be employed therein shall be not less than the number specified in Table VI; (b) the number of watercloset fitments provided for female persons employed or likely to be employed therein shall be not less than the number specified in Table VII; and (c) the number of lavatory basins provided for persons employed or likely to be employed therein shall not be less than the number specified in Table VIII. TABLE VI Type of fitment No. of male persons employed or likely to be employed and No. of fitments o be provided therefor Watercloset fitments Less than 100, 1 such fitment for every 25 such persons, or part thereof. More than 100, 5 such fitments and 1 additional such fitment for every 50 such persons, or part thereof, over 150. Urinals 10-50 inclusive, 1 such fitment. More than 50, 2 such fitments and 1 additional such fitment for every 50 such persons, or part thereof, over 100. TABLE VII No. of females employed or likely to be employed No. of watercloset fitments 1-10 inclusive 11-25 inclusive More than 25 1 2 3 and 1 additional watercloset fitment for every 25 such persons, or part thereof, over 50. TABLE VIII No. of male persons employed or likely to be employed No. of lavatory basins No. of female persons employed or likely to be employed No. of lavatory basins Less than 100 1 for every 25 such persons, or part thereof. Less than 100 1 for every 25 such persons, or part thereof. More than 100 5 and 1 additional lavatory basin for every 50 such persons, or part thereof, over 150. More than 100 5 and 1 additional lavatory basin for every 50 such persons, or part thereof, over150.(2) Baths or showers shall be provided in any industrial undertaking or other place of work (other than in a building used or intended to be used for the purpose of an office) as required for the trade or industry carried on therein. (3) Where, in any building used or intended to be used for the purpose of an office or in any industrial undertaking or other place of work, the number of persons, whether the same are or will be male persons or female persons, or both, employed or likely to be employed does not or will not exceed 10, there shall be provided not less than one watercloset fitment and one lavatory basin. (4) In every building used or intended to be used for the purpose of an office and in every industrial undertaking and other place or work, the watercloset fitments, urinals and lavatory basins for male persons and the watercloset fitments and lavatory basins for female persons shall be provided in separate rooms exclusively for the use of male persons and female persons respectively. (5) For the purposes of this regulation- (a) the number of persons employed or likely to be employed in any building used or intended to be used for the purpose of an office or in any other place of work (other than in an industrial undertaking) shall be determined by the Building Authority, and, in the case of a building used or intended to be used for the purpose of an office, shall be so determined at the rate of one person for every 9 square metres of usable floor space; (L.N. 294 of 1976) (b) the number of persons employed or likely to be employed in any industrial undertaking shall be determined by the Commissioner for Labour; and (c) in the case of a building used or intended to be used for the purpose of an office, the proportion of male persons to female persons employed or likely to be employed therein shall be deemed to be 2:1, and, in any other case, shall be determined by the Building Authority or, in the case of an industrial undertaking, by the Commissioner for Labour. Cap 123I reg 6 Places of public entertainment (1) In every place of public entertainment (other than a cinema) and in every public dance hall, the number of watercloset fitments, urinals and lavatory basins provided shall be not less than the number specified in Table IX. (L.N. 196 of 1996) TABLE IX Type of fitment No. of male persons and No. of fitments to be provided therefor No. of female persons and No. of fitments to be provided therefor Watercloset fitments Less than 400, 1 such fitment for every 100 such persons, or part thereof. More than 400, 5 such fitments and 1 additional such fitment for every 250 such persons, or part thereof, over 650. Less than 200, 2 such fitments for every 100 such persons, or part thereof. More than 200, 5 such fitments and 1 additional such fitment for every 100 such persons, or part thereof, over 300 Urinals 1 such fitment for every 50 such persons, or part thereof. __ Lavatory basins 1 such fitment for every 100 such persons, or part thereof. 1 such fitment for every 100 such persons, or part thereof.(2) In every place of public entertainment (other than a cinema) and in every public dance hall, the watercloset fitments, urinals and lavatory basins for male persons and the watercloset fitments and lavatory basins for female persons shall be provided in separate rooms exclusively for the use of male persons and female persons respectively. (L.N. 196 of 1996) (3) For the purposes of this regulation- (a) the number of persons shall be determined by the Building Authority, and shall be based on the maximum capacity of the place of public entertainment or public dance hall, as the case may be; and (b) the proportion of male persons to female persons shall be deemed to be 1:1. Cap 123I reg 7 Cinemas (1) In every cinema, the number of watercloset fitments, urinals and lavatory basins provided shall be not less than the number specified in Table X. TABLE X Type of fitment No. of male persons and No. of fitments to be provided therefor No. of female persons and No. of fitments to be provided therefor Watercloset fitment 1-200 inclusive, 1 such fitment. 201-500 inclusive, 2 such fitments. 501-1000 inclusive, 3 such fitments. More than 1000, 4 such fitments and 1 additional such fitment for every 500 such persons, or part thereof, over 1500. 1-100 inclusive, 1 such fitments. 101-250 inclusive, 2 such fitments 251-500 inclusive, 3 such fitments. More than 500, 4 such fitments and 1 additional such fitment for every such 400 such persons, or part thereof, over 900. Urinals 1 such fitment for every 100 such persons, or part thereof. __ Lavatory basins 1-200 inclusive, 1 such fitment. 201-500 inclusive, 2 such fitment. 501-1000 inclusive, 3 such fitments. More than 1000, 4 such fitments and 1 additional such fitment for every 500 such persons, or part thereof, over 1500. 1-200 inclusive, 1 such fitment. 201-500 inclusive, 2 such fitments. 501-1000 inclusive, 3 such fitments. More than 1000, 4 such fitments and 1 additional such fitment for every 500 such persons, or part thereof, over 1500.(2) In every cinema, the watercloset fitments, urinals and lavatory basins for male persons and the watercloset fitments and lavatory basins for female persons shall be provided in separate rooms exclusively for the use of male persons and female persons respectively. (3) For the purposes of this regulation- (a) the number of persons shall be determined by the Building Authority, and shall be based on the maximum capacity of the cinema; and (b) the proportion of male persons to female persons shall be deemed to be 1:1. Cap 123I reg 8 Restaurants (1) In every restaurant, except a restaurant provided in any hotel or boarding house for the use exclusively of persons resident in the hotel or boarding house, the number of watercloset fitments, urinals and lavatory basins provided shall not be less than the number specified in Table XI. TABLE XI Type of fitment No. of male persons and No. of fitments to be provided therefor No. female persons and No. of fitments to be provided therefor Watercloset fitment Less than 400, 1 such fitment for every 100 such persons, or part thereof. More than 400, 5 such fitments and 1 additional such fitment for every 250 such persons, or part thereof, over 650. Less than 200, 2 such fitments for every 100 such persons, or part thereof. More than 200, 5 such fitments and 1 additional such fitment for every 100 such persons, or part thereof, over 300. Urinals 1 such fitment for every 50 such persons, or part thereof. __ Lavatory basins Less than 100, 1 such fitment for every 50 such persons, or part thereof. More than 100, 3 such fitments and 1 additional such fitment for every 100 such persons, or part thereof, over 150. Less than 100, 1 such fitment for every 50 such persons, or part thereof. (G.N.A. 107 of 1976) More than 100, 3 such fitments and 1 additional such fitments for every 100 such persons, or part thereof, over 150.(2) For the purposes of this regulation- (a) the number of persons shall be determined by the Building Authority, and shall be based on the maximum capacity of the restaurant and determined at the rate of one person for every 1.5 square metre of the area therein used for dining; and (L.N. 294 of 1976) (b) the proportion of male persons to female persons shall be deemed to be 1:1. Cap 123I reg 8A (Repealed L.N. 242 of 1997) Cap 123I reg 9 Where soil fitments prohibited latrine fitments, etc. to be provided in lieu thereof, etc. (1) Where, in any case, the installation of soil fitments is, under regulation 89, prohibited- (a) latrine fitments shall be provided in lieu of watercloset fitments, and the number thereof shall be not less than the number of watercloset fitments required by regulation 4, 5, 6, 7 or 8, as the case may be; and (b) bucket urinals shall be provided in lieu of urinals, and, likewise, the number thereof shall be not less than the number of urinals required by regulation 4, 5, 6, 7 or 8, as the case may be.(2) Where, by regulation 4, 5, 6, 7 or 8, the provision of watercloset fitments is required, trough waterclosets may be provided and, for the purposes of those regulations, every metre of trough watercloset shall be deemed to be the equivalent of one watercloset fitment. (3) Where, by regulation 4, 5, 6, 7 or 8, the provision of urinals is required, and trough urinals are installed, every 0.5 m of trough urinals shall, for the purposes of those regulations, be deemed to be the equivalent of one urinal. (L.N. 294 of 1976) Cap 123I reg 10 Sanitary fitments for persons employed in residential buildings, etc. For the avoidance of doubt, it is hereby declared that the provision in a residential building, place of public entertainment, cinema or restaurant of the watercloset fitments, urinals and lavatory basins required, by the regulations in this Part, to be provided therein shall not exempt any person from providing, in accordance with regulation 5, such watercloset fitments, urinals and lavatory basins as are required thereby to be provided for persons employed or likely to be employed in the residential building, place of public entertainment, cinema or restaurant, as the case may be. Cap 123I reg 10A Supply of water (1) Where under these regulations there is required to be provided in any building any watercloset fitment, trough watercloset, latrine fitment or urinal, there shall be a permanent connection to such building of a supply of water which is satisfactory and sufficient in all respects for the purpose of flushing every such watercloset fitment, trough watercloset, latrine fitment or urinal and for all other purposes for which such supply is to be used. (2) Where under these regulations there is required to be provided in any building any waste fitment or shower, there shall be a permanent connection to such building of a supply of water which is satisfactory and sufficient in all respects for all the purposes for which every such waste fitment or shower is to be used and for all other purposes for which such supply is to be used. (3) The connection of a supply of water for the purposes of paragraph (1) or (2) shall be- (a) of a supply of water from the waterworks; or (b) if the Building Authority gives his permission in writing, of a supply of water from a well within the site of the building; or (c) if in all the circumstances of the case the Building Authority is satisfied that it is not reasonable that the connection be of a supply of water from the waterworks or from a well within the site of the building, of a supply of water from such other source as the Building Authority may permit or direct.(4) In determining whether a supply of water is satisfactory and sufficient under this regulation, regard shall be had to the nature, type and size of the building, the purpose for which it was constructed or is intended to be or is used and all the purposes for which the supply of water is or is likely to be used. (5) Before the Building Authority gives his permission under paragraph (3)(b) for the connection to a building of a supply of water from a well within the site of the building or before the Building Authority under paragraph (3)(c) permits or directs the connection to a building of a supply of water from a source other than the waterworks or a well within the site of the building, there shall be produced to the Building Authority by the building owner a certificate from the water authority as to whether or not a supply of water from the waterworks is available for the purposes for which such connection is made or to be made. (6) The water authority shall issue the certificate required under paragraph (5) within 10 days of receiving an application in writing therefor. (7) For the purposes of this regulation- (a) a supply of water shall be satisfactory if the yield of water from such well during a period from 1 December to 30 April next following, as ascertained and certified in accordance with this paragraph, would be sufficient in all respects for all the purposes for which the well is to be used; and (b) the yield of water from a well shall be ascertained by the authorized person by a recognized method- (i) during the first such period referred to in sub-paragraph (a), after the first consent to the commencement of the building works is given by the Building Authority in respect of the building for which the well is required or, if such first consent is given during such a period, then during such period; or (ii) if the Building Authority so directs, during any such period as is referred to in sub-paragraph (a) after the first consent to the commencement of the building works is given by the Building Authority in respect of the building for which the well is required; and(c) the yield of water from the well ascertained in accordance with sub-paragraph (b) shall be certified by the authorized person. (L.N. 439 of 1990) (L.N. 62 of 1966) Cap 123I reg 11 Disposal of soil PART III PLUMBING All soil shall be properly conducted, by means of suitable soil pipes, to drains provided for the carriage of foul water. (G.N.A. 107 of 1959) Cap 123I reg 12 Waste pipes (1) Save as provided in paragraphs (2) and (3) waste pipes shall discharge in the open air- (a) over or into a suitable channel within 1 m of a properly trapped gully; (L.N. 294 of 1976) (b) into a gully, above the level of the water therein; or (c) into a suitable hopper head.(2) Waste pipes from lavatory basins may discharge- (a) into a suitable drainage channel immediately below the lavatory basins, if such drainage channel discharges into a trapped gully; or (b) into a common waste pipe, if the common waste pipe discharges through a trap and has adequate means of access for cleaning.(3) Subject to the provisions of regulation 25(3), waste pipes may be connected to a soil pipe. Cap 123I reg 13 Materials for soil fitments Every soil fitment shall be constructed of glazed earthenware, enamelled fire clay or other approved material. Cap 123I reg 14 Construction of watercloset fitments (1) Every watercloset fitment, other than a squatting type fitment, shall be of such shape, capacity and mode of construction as to retain a sufficient quantity of water and to receive normal deposits of excrement into such water without undue soiling of the sides of the fitment. (2) Every watercloset fitment, other than a squatting type fitment, shall be provided with a hinged seat or a suitable seat rim or inset. (L.N. 361 of 1980) Cap 123I reg 15 Construction of trough waterclosets The channel of a trough watercloset shall be not longer than 5 m and shall have an even fall towards the outlet trap of not less than 1 in 30. (L.N. 294 of 1976) Cap 123I reg 16 Construction of urinal channels The channels of every stall and trough urinal shall have an even fall towards the outlet trap of not less than 1 in 120 and no part of any such channel shall be more than 6 m from the trap to which it discharges. (L.N. 294 of 1976) Cap 123I reg 17 Flushing water supply (1) A system of plumbing shall be provided for the supply of water for flushing purposes to every watercloset fitment, trough watercloset, urinal and slop sink. (2) Every part of any such system of plumbing (including any storage tank for water solely for flushing purposes) shall be constructed of material that is suitable for use with salt water. (L.N. 113 of 1964) Cap 123I reg 18 Flushing rim Every watercloset fitment, bidet, basin-type urinal and slop sink shall be provided with a suitable flushing rim for the effectual flushing of the fitting. Cap 123I reg 19 Flushing cisterns (1) Save as provided in regulation 20, every watercloset fitment, trough watercloset, urinal and slop sink shall be provided with a flushing cistern. (2) Such flushing cistern shall- (a) in the case of watercloset fitments and slop sinks- (i) discharge to the watercloset fitment of slop sink, on each occasion such fitment is used, not less than 9 litres and not more than 14 litres of water; and (ii) be provided with a ball valve so arranged as to re-fill the cistern within 2 minutes;(b) in the case of trough waterclosets, be fitted with automatic discharging apparatus so arranged as to discharge- (i) at the highest point of the channel; (ii) at such intervals as may be necessary of ensure adequate cleaning of the closet, not less than 9 litres of water for every metre of the channel;(c) in the case of urinals, be fitted with automatic discharging apparatus so arranged as to discharge- (i) into every basin or stall or, in the case of a trough urinal, every metre thereof, (ii) at such intervals as may be necessary to ensure adequate cleaning of the urinal, not less than 4.5 litres of water. (L.N. 294 of 1976) Cap 123I reg 20 Pressure valves Save in the case of trough waterclosets and urinals, pressure valves may, where there is a suitable head of water, be installed for flushing purposes without the provision of a flushing cistern. Cap 123I reg 21 Flushing pipes The internal diameter of flushing pipes shall- (a) in the case of watercloset fitments, trough waterclosets and slop sinks, be not less than 32 mm; (b) in the case of urinals (other than trough urinals), be not less than 15 mm for each basin or stall; and (c) in the case of trough urinals, be not less than 15 mm for every metre thereof. (L.N. 294 of 1976) Cap 123I reg 22 Storage tanks for flushing water (1) Storage tanks for water solely for flushing purposes shall be provided in every building in which watercloset fitments, trough waterclosets, urinals or slop sinks are installed. (2) Every such tank shall- (a) at a position above the level of the highest fitment or on a suitable water tower; (b) fitted with a suitable close fitting cover; and (c) provided with adequate access to enable the tank to be entered and cleaned. Cap 123I reg 23 Overflow pipes (1) Every flushing cistern and water storage tank shall be provided with an overflow pipe. (2) The overflow pipe from a water storage tank shall- (a) have an internal diameter of one commercial size larger than the supply pipe to the cistern or tank; (L.N. 361 of 1980) (b) dip down, inside the tank, so as to terminate in a position not more than 150 mm above the bottom of the tank; and (L.N. 294 of 1976) (c) discharge in a conspicuous position. Cap 123I reg 24 Traps for soil fitments (1) Every soil fitment shall be provided with a suitable trap with a water seal of not less than 50 mm. (2) The internal diameter of every such trap shall be not less than- (a) 80 mm, in the case of a watercloset fitment, slop sink, or urinal with more than 3 basins or stalls or with a channel longer than 2 m; (b) 50 mm, in the case of a urinal with more than one and not more than 3 basins or stalls or with a channel not longer than 2m; (c) 40mm, in the case of a bidet or urinal with a single basin or stall; and (d) 100 mm, in the case of a trough watercloset. (L.N. 294 of 1976) Cap 123I reg 25 Traps for waste fitments (1) Every waste fitment shall be provided immediately under the fitment with a suitable trap: Provided that a trap shall not be required- (a) where the waste pipe from such fitment- (i) does not exceed 1 m in length; and (ii) discharges over or into a suitable trapped gully;(b) in respect of lavatory basins, where the waste pipes therefrom discharge in the manner provided by regulation 12(2); (c) in respect of a range of shower baths, where the drainage channel provided therefor is provided, at its lowest point, with a trap.(2) Save as provided in paragraph (3), every trap provided for a waste fitment shall have- (a) an internal diameter of not less than 32 mm; and (b) a water seal of not less than 40 mm.(3) Where the waste pipe from a waste fitment is, under the provisions of regulation 12(3), connected to a soil pipe, the trap provided for the waste fitment shall- (a) have an internal diameter of not less than 32 mm; (b) have a water seal of not less than 80 mm; and (c) be- (i) adequately ventilated; or (ii) constructed to prevent loss of water seal. (L.N. 294 of 1976) Cap 123I reg 26 Soil pipes Pipes and eaves gutters (1) The internal diameter of every soil pipe from a watercloset fitment or slop sink shall be not less than- (a) 80 mm; or (L.N. 294 of 1976) (b) the internal diameter of the outlet pipe of the trap of any fitment to which the soil pipe is connected,whichever is the greater. (2) The internal diameter of every soil pipe from a urinal or bidet shall be not less than the internal diameter of the outlet pipe of the trap of any fitment to which the soil pipe is connected. (3) Every soil pipe shall be properly connected to a covered drain without the intervention of any trap. Cap 123I reg 27 Waste pipes (1) Waste pipes to which the waste from one waste fitment is discharge shall have an internal diameter of not less than- (a) 32 mm; or (L.N. 294 of 1976) (b) the internal diameter of the outlet of the trap to which the waste pipe is connected,whichever is the greater. (2) Waste pipes to which the waste from more than one fitment is discharged shall be of adequate diameter to convey all such waste. (3) Every waste pipe shall terminate at its lower end not more than 150 mm above the channel or trapped gully over or into which it discharges. (L.N. 294 of 1976) Cap 123I reg 28 Bends in soil and waste pipes (1) Soil pipes and waste pipes shall not have bends therein, except where unavoidable. (2) Whenever a bend is unavoidable- (a) the bend shall- (i) have an obtuse angle; (ii) have the largest practicable radius of curvature; and (iii) not change in any way the cross section of the pipe;and(b) a cleaning eye or other suitable means of access shall be provided at or near the bend. Cap 123I reg 29 Access to soil and waste pipes (1) Sufficient access shall be provided, by means of cleaning eyes or other approved method, to enable soil pipes and waste pipes to be cleared of any obstruction. (2) Such access points shall be so sited as to allow clearance for the easy entry of cleaning rods. Cap 123I reg 30 Anti-syphonage pipes (1) Where- (a) more than one trap of a watercloset fitment, urinal, slop sink or waste fitment is connected with one soil pipe; or (b) more than one trap of a waste fitment is connected with one waste pipe,the traps shall be ventilated by means of anti-syphonage pipes: Provided that if, in the case of waste fitments, the traps to such fitments are constructed to prevent loss of water seal, it shall not be necessary to provide an anti-syphonage pipe, unless the Building Authority so requires. (2) Every anti-syphonage pipe shall be connected with- (a) the trap, if the connection with the anti-syphonage pipe is an integral part of the trap; or (b) the branch soil pipe or branch waste pipe- (i) on the side of the water seal nearest the main soil pipe or waste pipe; and (ii) at a point not more than 300 mm from the trap outlet. (L.N. 294 of 1976)(3) The internal diameter of every anti-syphonage pipe shall- (a) if the diameter of the soil pipe or waste pipe to which it is connected is 80 mm or more, be not less than 50 mm; (b) if the diameter of such soil pipe or waste pipe is less than 80 mm, be not less than- (i) two-thirds of the internal diameter of such soil pipe or waste pipe; or (ii) 32 mm, whichever is the greater. (L.N. 294 of 1976)(4) (a) The main anti-syphonage pipe may be connected to a soil pipe which, under regulation 31(3), is acting as a ventilating pipe; (b) every such connection shall be made at a point above the flood level of the highest fitment connected to the soil pipe. Cap 123I reg 31 Ventilating pipes (1) Every ventilating pipe for any drain or sewer shall be carried up to a height not less than 1 m above the roof of the building to which it is fixed or, where such building has a pitched roof, above the eaves of such building. (L.N. 294 of 1976) (2) No ventilating pipe shall be so fixed as to permit the escape of foul air from any drain, sewer, soil pipe or waste pipe into any building. (3) Soil pipes or waste pipes may be carried up to a suitable height above the building to which they are fixed to act as ventilating pipes for any drain or sewer. (4) The internal diameter of every ventilating pipe and of every soil pipe or waste pipe which, under paragraph (3), is acting as a ventilating pipe, shall be not less than 80 mm. (L.N. 294 of 1976) (5) The open end of every ventilating pipe shall be provided with a suitable grating having apertures of an aggregate area not less than the sectional area of the pipe. (6) Ventilating pipes shall not be used for the carriage of surface water. Cap 123I reg 32 Rain water pipes (1) (a) Every rain water pipe which discharges to a drain which is connected to a public sewer provided for the carriage of surface water shall- (i) in the case of a rain water pipe situated outside a building, discharge either not more than 150 mm above the level of the ground over a suitably trapped gully or into a trapped gully below the level of the grating but above the level of the water in the trap; and (ii) in the case of a rain water pipe situated inside a building (other than a rain water pipe used solely for the conveyance of rain water from a roof), be properly trapped with an efficient trap which shall be so formed and fixed as to maintain a water seal of not less than 75 mm. (L.N. 62 of 1966; L.N. 361 of 1980) (b) Every rain water pipe which discharges to a channel shall discharge at a height not more than 150 mm above the level of the top of the channel. (c) Every rain water pipe which discharges, through a cast iron conductor, to the side channel in a street shall be provided, at the foot thereof, with a shoe so as to ensure that any surface water discharged from the pipe will discharge directly into the conductor.(2) The number and size of rain water pipes provided for any building shall be calculated at the rate of 700 square millimetres of pipe to every 10 square metres of horizontal roofed-over surface. (3) Save as provided in regulation 33, the diameter of every rain water pipe shall be not less than 65 mm. (4) Rain water pipes shall not be connected with any soil pipe, waste pipe or ventilating pipe. (5) Where a rain water pipe discharges, across any footpath, to the side channel of a street, it shall discharge through a cast iron conductor. (L.N. 294 of 1976) Cap 123I reg 33 Rain water pipes for verandahs or balconies (1) Any rain water pipe provided for the carriage of surface water from a verandah or balcony shall, where there is, at a suitable position, a rain water pipe provided for the carriage of surface water from the roof of the building, be connected to such pipe. (2) Where a rain water pipe provided for the carriage of surface water from a verandah or balcony discharges to the side channel in a street or is, in accordance with paragraph (1), connected to a rain water pipe which so discharges, the internal diameter of the rain water pipe from the verandah or balcony shall be not more than 40 mm. (L.N. 294 of 1976) Cap 123I reg 34 Materials for pipes (1) Every soil pipe, waste pipe, anti-syphonage pipe, ventilating pipe, overflow pipe and every pipe connected with any drain provided for the carriage of foul water shall be- (a) circular in shape; and (b) constructed of cast iron, steel, copper or other approved material.(2) Every rain water pipe shall be constructed of cast iron, copper or other approved material. (L.N. 295 of 1986) (3) All such materials shall be sound and free from defects. Cap 123I reg 35 Connections of pipes, etc. Every connection of a soil pipe, waste pipe, anti-syphonage pipe, ventilating pipe, rain water pipe or overflow pipe with any other pipe, or with a trap, gutter or other fitting, as the case may be, shall be made in a manner suitable to the nature of the materials of which such pipe and such other pipe or trap, gutter or other fitting are constructed, and so as to be watertight. (G.N.A. 107 of 1959) Cap 123I reg 36 Fixing of pipes (1) Every soil pipe, waste pipe and rain water pipe shall be securely fixed to the wall of the building for which it is provided. (2) Any hole which is made in any floor or wall in order to admit any such pipe shall be properly filled in and sealed round the pipe. Cap 123I reg 37 Pipes in ducts Where a soil pipe, waste pipe, anti-syphonage pipe, ventilating pipe, or rain water pipe is fixed in a duct within a building, access panels shall be provided of such size and so situated that adequate access is available to all pipe connections within the duct. Cap 123I reg 38 Eaves gutters (1) Eaves gutters shall be- (a) made of cast iron or other approved material; (b) fixed at a gradient not less than 1 in 100; and (c) properly connected to rain water pipes.(2) The size of eaves gutters shall be calculated at the rate of 700 square millimetres of cross sectional area of gutter to every 7 square metres of horizontal roofed-over surface. (L.N. 294 of 1976) Cap 123I reg 38A British Standard Specification and other national standards The Building Authority may permit, in writing and subject to such conditions as he may endorse thereon, the use of materials or the carrying out of any works that are subject to this Part in accordance with a relevant British Standard Specification, British Standard Code of Practice or other national standard accepted by the Building Authority and that prescribes the quality of material or standards of workmanship. (L.N. 361 of 1980) Cap 123I reg 39 Drainage of buildings PART IV DRAINAGE WORKS Every building shall be provided with such pipes, drains and channels as are necessary for the disposal of all foul water and surface water from the building. Cap 123I reg 40 Disposal of foul water (1) Drains and private sewers, provided for the carriage of foul water, shall, where there is a public sewer provided for the carriage of foul water at a suitable level and position within 30 m of the boundary of the lot on which the building, for which such drains or private sewers are provided, is erected, be connected to such public sewer. (L.N. 294 of 1976) (2) Where there is no such public sewer, the Building Authority may, by order in writing, require the owner of any building to provide a septic tank, a cesspool or other approved facility. (L.N. 361 of 1980) Cap 123I reg 41 Disposal of surface water (1) Save as provided in paragraph (2), all surface water from a building shall, if there is a public sewer, provided for the carriage of surface water, at a suitable level and position within 30 m of the building, be conducted, by means of rain water pipes and drains provided for the carriage of surface water, to such public sewer or, where there is no such public sewer, shall be conducted, to the satisfaction of the Building Authority, to a public channel provided for the carriage of surface water or to the side channel in a street. (L.N. 294 of 1976) (2) Where there is no such public sewer and no public channel or side channel in a street, such surface water shall be conducted, to the satisfaction of the Building Authority, to a stream course or nullah. Cap 123I reg 42 Pipes carrying surface water not to discharge across surface of footpath No pipe provided for the carriage of surface water from a building shall discharge across the surface of any footpath in a street. Cap 123I reg 43 Disposal of sub-soil water Drains provided for the carriage of sub-soil water may be connected to a private or public sewer provided for the carriage of surface water or to a drain provided therefor. Cap 123I reg 44 Materials for drains, etc. (1) Covered drains (except covered drains provided for the carriage of sub-soil water) and covered sewers shall be made with good sound pipes of glazed earthenware, stone ware, concrete, cast iron or other approved material. (2) Drains and sewers above the ground shall be laid with cast iron pipes or other approved materials. (L.N. 361 of 1980) (3) All pipes used in the construction of any drain or sewer shall- (a) be of true bore; (b) have smooth internal surfaces; and (c) be impervious.(4) Cast iron sewage pipes shall be protected against rust and corrosion by a suitable asphaltic coating. (5) Earthenware, stone ware and concrete pipes shall- (a) in the case of pipes with a diameter not exceeding 150 mm, have a thickness equal to not less than one-ninth of the diameter of the pipe; and (b) in the case of pipes with a diameter exceeding 150 mm, have a thickness equal to not less than one-twelfth of the diameter of the pipe. (L.N. 294 of 1976) Cap 123I reg 45 Sub-soil water drains Drains provided for the carriage of sub-soil water shall be constructed with clay field pipes or other suitable pipes and shall be laid to adequate falls. Cap 123I reg 46 Size of drains All drains and sewers shall be of adequate, but not excessive, size for the purpose for which they are provided: Provided that no covered drain shall have an internal diameter of less than 100 mm. (L.N. 294 of 1976) Cap 123I reg 47 Laying of drains and sewers (1) All drains and sewers (except drains provided for the carriage of sub-soil water) and traps shall be firmly laid on a bed of concrete not less than 100 mm in thickness and at least 150 mm wider than the diameter of the pipe or trap, and shall be haunched with concrete so that the full width of the bed is carried up to the level of the horizontal diameter of the pipe and from that point splayed up on both sides of the pipe from the full width of the bed to meet the pipe barrel tangentially. (L.N. 294 of 1976) (2) All drains and sewers shall be supported along the full length of the barrels and not by the sockets. (3) Where any drain or sewer is laid in soft and yielding ground- (a) adequate support shall be provided for such drain or sewer; and (b) save where the same are provided for the carriage of sub-soil water, the pipes shall be completely surrounded by at least 100 mm of concrete. (L.N. 294 of 1976)(4) Cast iron pipes above the ground may be carried on adequate piers or other sufficient supports, if such support is provided at each joint. Cap 123I reg 47A Drains and sewers in gathering grounds to be watertight (1) Every drain or sewer provided for the carriage of foul water from any building which lies within a gathering ground shall be watertight and shall- (a) be laid in pipes of cast iron or other approved material and be of such design and construction as to be capable of resisting the pressure to which it is likely to be subjected; (b) have any hatch box constructed on the drain or sewer so that the hatch box is capable of resisting the pressure to which it is likely to be subjected; and (c) have every joint in the drain or sewer made in lead, or other approved material so as to render the drain or sewer capable of resisting the pressure to which the drain or sewer is likely to be subjected.(2) Every joint in a drain or sewer referred to in paragraph (1) shall be made by bolting the flanges together securely with suitable metallic or asbestos gaskets or shall be of such other approved construction so as to render the drain or sewer capable of resisting the pressures to which the drain or sewer is likely to be subjected. (3) Hatch boxes shall be provided to a drain or sewer referred to in paragraph (1)- (a) at intervals not exceeding 30 m in the drain or sewer; (b) at changes of gradient, if the Building Authority so requires; and (c) at every change in direction in the drain or sewer: Provided that no hatch box is required where the change in direction does not exceed 10 degrees and is made by means of a purpose-made bend.(4) Notwithstanding paragraph (3), not more than one manhole shall be permitted in each drain or sewer. (5) Every hatch box shall be constructed of cast iron or other approved material and shall have a hatch or door securely bolted at the top thereof. (6) In this regulation- "gathering ground" (集水区) has the same meaning as in the Waterworks Ordinance (Cap 102); "hatch box" (检查箱) means a chamber of such a size and form as readily allows inspection and testing of the drain or sewer on which it is constructed and the clearance of obstructions from the drain or sewer. (L.N. 361 of 1980) Cap 123I reg 48 Falls of drains Every drain or private sewer shall be laid with a minimum fall from its highest inlet to its connection with a public sewer or other outlet in accordance with Table XII below. TABLE XII Diameter of pipe Fall 100 mm 150 mm 225 mm 300 mm 1 in 40 1 in 70 1 in 100 1 in 150 (L.N. 294 of 1976) Cap 123I reg 49 Junctions of drains (1) The junction of a single branch drain with another drain at an angle of not more than 45 degrees in the direction of flow may be made by means of a purpose-made Y junction. (2) The junction of every other branch drain with another drain shall be made within a manhole, obliquely at an angle of not more than 60 degrees in the direction of flow of such other drain, and shall be above the invert of such other drain. Cap 123I reg 50 Joints (1) Every joint in a drain or sewer shall be made in a proper and efficient manner so as to render the drain or sewer watertight and capable of resisting a pressure of a head of water of- (a) 1.5m; or (L.N. 294 of 1976) (b) the vertical distance between the invert level of the pipe joint and the level of the top of the manhole immediately preceding the joint,whichever is the greater, and no material forming any such joint shall project into the interior of any pipe in such manner as to cause any obstruction in the drain or sewer. (L.N. 361 of 1980) (2) The joints of cast iron socketed pipes shall be made with a gasket of hemp or yarn, and shall be properly caulked with metallic lead or other approved material. (3) The joints of cast iron flanged pipes shall be made by bolting the flanges together securely with a suitable metallic or asbestos gasket. (4) The joints of earthenware, stone ware or concrete pipes shall be made with a gasket of hemp or yarn, and cement mortar or other approved material. Cap 123I reg 51 Inlets to drains (1) Subject to paragraph (2), every inlet to a drain or sewer shall be properly trapped by an efficient trap, which shall be so formed and fixed as to maintain a water seal of not less than 75 mm. (2) Paragraph (1) shall not apply- (a) to an inlet for a soil pipe or a ventilating pipe; (b) to an inlet for the carriage of any trade effluent; (c) where no other means of connection is practicable; or (d) to an inlet to a drain used solely for the conveyance of rain water from a roof. (L.N. 361 of 1980) Cap 123I reg 52 Ventilation (1) Every drain provided for the carriage of foul water shall be ventilated at its highest point by means of a ventilating pipe having an internal diameter of not less than 50 mm. (L.N. 294 of 1976) (2) Every manhole in which a disconnecting trap is fixed shall be adequately ventilated. (3) Branch drains shall be ventilated at their highest point, if the Building Authority so requires. Cap 123I reg 53 No traps between ventilated points No trap or other obstruction to the free circulation of air shall be placed between the ventilation openings at the lower and higher ends of any drain or sewer. Cap 123I reg 54 Drains and sewers under buildings, etc. (1) All drains and sewers under a building shall be laid in straight lines and shall be laid with cast iron sewage pipes. (2) Where any drain or sewer is laid through any building, or where any building is constructed over any drain or sewer, relieving arches or beams shall be provided to protect such drain or sewer and to prevent any load from the building being transmitted to such drain or sewer. Cap 123I reg 55 Manholes and cleaning eyes to be provided (1) Manholes shall be provided- (a) at every change in direction in any drain or sewer except where- (i) the change in direction does not exceed 45 degrees; (ii) the internal radius of the bend is not less than 6 times the internal diameter of the drain or sewer; and (iii) the change in direction is made by means of a purpose-made pipe; and(b) at changes of gradient, if the Building Authority so requires.(2) Manholes or cleaning eyes shall be provided at intervals not exceeding 60 m in every drain and sewer. (L.N. 294 of 1976) Cap 123I reg 56 Construction of manholes (1) Every manhole shall be of such size and form as to allow ready access for rodding and shall be constructed of- (a) brickwork in cement mortar at least 215 mm in thickness; (b) concrete at least 125 mm in thickness; or (L.N. 439 of 1990) (c) other approved impervious material. (L.N. 294 of 1976)(2) The foundation of every manhole shall be constructed of concrete not less than 150 mm in thickness. (L.N. 294 of 1976) (3) Benchings shall be formed above the level of every drainage channel in a manhole to fall towards such channel at a gradient of 1 in 2. (4) The benchings and all the internal faces of every manhole shall be rendered with cement mortar so as to provide a smooth and impervious surface. (5) Every drainage channel in a manhole shall be not less than half round glazed earthenware or cement rendered, and shall have a diameter not less than that of the largest drainage inlet into and not more than that of the outlet from the manhole. (6) Every drainage inlet to a manhole shall discharge into the drainage channel therein with properly made bends constructed within the benching of the manhole. (7) Every manhole shall be fitted, on a level with the ground surface, with a cast iron airtight cover of adequate strength and approved design: Provided that every manhole inside or under a building shall be fitted with a double-sealed cast iron airtight cover. (L.N. 361 of 1980) Cap 123I reg 57 Disconnecting traps Remarks: Amendments retroactively made - see 29 of 1998 s. 29 (1) A suitable and efficient disconnecting trap shall be provided for every drain and sewer provided for the carriage of foul water, and for every drain and sewer provided for the carriage of surface water except where such drain or sewer is connected to a stream course or an open nullah. (2) Except under and in accordance with a permit issued under the Land (Miscellaneous Provisions) Ordinance (Cap 28) to occupy Government land thereby, every such trap and the manhole in which it is fixed shall be situated on land owned by the owner or owners of the building or buildings for which the drain or sewer is provided, at a position as near as practicable to the place at which such drain or sewer is connected to a public sewer or, in the case of a drain or sewer, provided for the carriage of surface water, which is connected to a covered nullah, at a position as near as practicable to the nullah. (L.N. 361 of 1980; 29 of 1998 s. 29) (3) Every such trap shall be- (a) fixed within a manhole; (b) so formed and fixed as to have a water seal of not less than 75 mm; and (L.N. 294 of 1976) (c) provided, as an integral part of the trap, with a cleaning eye. Cap 123I reg 58 Gullies (1) Open trapped gullies shall be covered with a suitable grating having openings equal to an area not less than the cross sectional area of the outlet of the trap. (2) Where sealed trapped gullies are used, adequate provision shall be made for the ventilation of the space above the water level of the trap. Cap 123I reg 59 Cleaning eyes Every cleaning eye shall be- (a) fitted with a cover, in order to make the cleaning eye airtight and watertight; and (b) of such size as to allow easy entry for cleaning rods. Cap 123I reg 60 Filling in of drainage trenches (1) All trenches in which drains or sewers have been laid shall be carefully filled in, around and above the drains or sewers, with earth which shall be carefully rammed and consolidated. (2) No stones or other material which will not pass through a 50 mm ring shall be deposited in any such trench within 300 mm of the top of any drain or sewer. (L.N. 294 of 1976) Cap 123I reg 61 Surface water channels (1) Channels provided for the carriage of surface water shall be of adequate size, constructed of approved impervious material, finished off smooth and laid to a gradient of not less than 1 in 100. (2) Suitable grilles shall be provided to prevent sand, silt and other debris from entering any public sewer, public channel, nullah or stream course. (3) A cover in a foot-path to a channel for the carriage of surface water shall be flush with the path surface and any hole in such cover or between such cover and another shall not exceed 20 mm in one dimension. (L.N. 366 of 1984) Cap 123I reg 62 Disposal of effluent PART V SEPTIC TANKS (1) The owner of any building who is about to install a septic tank shall submit to the Building Authority for his approval the methods by which it is intended to dispose of the effluent and sludge from the septic tank. (2) The Building Authority shall not give his approval thereof if, in his opinion, the method or methods proposed is or are likely to cause a nuisance or injury to health. (L.N. 361 of 1980) Cap 123I reg 63 Situation of septic tank (1) No septic tank shall be situated within 18 m of any spring, stream of water or well, the water from which is used or likely to be used for drinking or domestic purposes or for the manufacture or preparation of articles of food or drink for human consumption or for the cleansing of vessels used in the manufacture or preparation of such articles. (L.N. 294 of 1976) (2) Every septic tank shall be so situated that the removal of sludge can be carried out by an approved method. (L.N. 361 of 1980) Cap 123I reg 64 Design Save insofar as provision is made therefor in these regulations, every septic tank together with any ancillary installation for the disposal of septic tank effluent shall be of such design as the Building Authority may approve. (L.N. 361 of 1980) Cap 123I reg 65 Capacity (1) Every septic tank shall have such minimum capacity as shall be determined by the Building Authority in the manner prescribed by paragraph (2): Provided that no septic tank shall have a capacity of less than 2.3 cubic metres or more than 41 cubic metres. (L.N. 294 of 1976) (2) (a) The septic tank shall be of such capacity as to be capable of storing the quantity of soil and waste discharged thereto during any one day. (b) The quantity of soil and waste discharged shall be calculated according to the rate of consumption of potable and flushing water which, in the opinion of the Building Authority, is appropriate to the type, size and use of the building. (L.N. 361 of 1980)(3) For the purposes of this regulation, the number of persons using or likely to use the soil and waste fitments installed in any building shall be determined by the Building Authority. (L.N. 361 of 1980) Cap 123I reg 66 Construction (1) Every septic tank shall- (a) have a depth of at least 1.2m but not more than 1.8m from the invert of the inlet to the floor of the tank; (b) have a length not less than 3 times but not more than 4 times its width; (c) be provided with adequate means of access for the inspection and cleansing of each chamber. (L.N. 361 of 1980)(2) The sides of every septic tank shall be constructed of- (a) brickwork in cement mortar not less than 215 mm thick; (b) concrete not less than 125 mm thick; or (L.N. 439 of 1990) (c) other approved material.(3) The foundation and floor of every septic tank shall be constructed of concrete not less than 150 mm thick. (L.N. 439 of 1990) (4) All internal faces (including the floor) of every septic tank shall be- (a) rendered in cement mortar; or (b) faced with other approved material,so as to provide a smooth, impervious surface. (L.N. 294 of 1976) Cap 123I reg 67 Dip pipes The inlet to and the outlet from every septic tank shall be by means of dip pipes of such depth as to avoid disturbance of the top scum. Cap 123I reg 68 Ventilation In every septic tank the space between the top of the water level and the underside of the cover shall be- (a) adequately ventilated; or (b) provided with adequate means for drawing off gases. Cap 123I reg 69 Situation of cesspools PART VI CESSPOOLS No cesspool shall be situated- (a) within 20 m of any spring, stream of water or well, the water from which is used, or likely to be used, for drinking or domestic purposes or for the manufacture or preparation of articles of food or drink for human consumption or for the cleansing of vessels used in the manufacture or the preparation of such articles; or (b) within 15 m of any building in which any person resides or works. (L.N. 294 of 1976) Cap 123I reg 70 Disposal of contents Every cesspool shall be so situated that there shall be adequate means for removing its contents without carrying them through any building in which any person resides or works. Cap 123I reg 71 Capacity (1) Every cesspool shall have such minimum capacity as shall be determined by the Building Authority in the manner prescribed by paragraph (2). (2) (a) The cesspool shall be of such capacity as to be capable of storing the quantity of soil and waste discharged thereto during a period of one month. (b) The quantity of soil and waste discharged shall be calculated at the rate of 135 litres thereof for each day for each person using or likely to use the soil fitments or waste fitments installed in the building for which the cesspool is provided, (L.N. 294 of 1976)(3) For the purposes of this regulation, the number of persons using or likely to use the soil fitments or waste fitments installed in any building shall be determined by the Building Authority. Cap 123I reg 72 Construction (1) Every cesspool shall be- (a) constructed of- (i) brickwork in cement mortar; (ii) concrete; or (L.N. 439 of 1990) (iii) other approved material;(b) so constructed and finished as to be impervious to liquid either from the inside or the outside; (c) covered with a reinforced concrete cover; (d) provided with adequate access for cleaning purposes; and (e) adequately ventilated.(2) The internal faces of every cesspool shall be rendered with cement mortar. Cap 123I reg 73 Testing of drainage works and procedure thereupon PART VII TESTING OF DRAINAGE WORKS (1) The registered general building contractor or the registered specialist contractor appointed in respect of any drainage works shall, on the completion of such works, but before any trenches in which drains or sewers have been laid are filled in, apply, in writing, to the Building Authority for such works to be tested. (2) On such application the Building Authority may inspect and test the drainage works and shall- (a) if he is satisfied with the result of such test, notify the registered general building contractor or the registered specialist contractor appointed in respect thereof accordingly; or (b) if he is not so satisfied, order such work to be carried out as may be necessary to cause such works to comply with these regulations.(3) An order made under paragraph (2)(b) shall be in writing and shall specify- (a) the work to be carried out; and (b) the period of time within which such work must be carried out.(4) After the expiry of the period specified in any such order, the Building Authority shall again inspect and test the drainage works and, where, by reason of any failure to comply with such order, more than one further inspection and test is necessary, shall inspect and test such works such number of times as may be necessary and, when he is satisfied with the results of any test, shall notify the registered general building contractor or the registered specialist contractor appointed in respect of such works accordingly. (5) In respect of every inspection and test made in accordance with the provisions of paragraph (4), the registered general building contractor or the registered specialist contractor appointed in respect of the drainage works shall pay the prescribed fee. (6) If the Building Authority does not test any drainage work within 4 days of the receipt of an application therefor under paragraph (1), the trenches in which any drains and sewers have been laid may be filled in. (L.N. 516 of 1997) Cap 123I reg 74 Power of Building Authority to require drainage trenches to be opened Save where a trench in which drains or sewers have been laid is filled in pursuant to the provisions of regulation 73(6), if a trench in which drains or sewers have been laid is filled in before the Building Authority has, under regulation 73, notified the registered general building contractor or the registered specialist contractor appointed in respect of the drainage works that he is satisfied with the result of a test, the Building Authority may require such registered general building contractor or the registered specialist contractor to open and uncover the drainage works in order to enable him to carry out an inspection and test. (L.N. 5