4. Models and type-plans of privies and urinals, approved by the Commissioners, with estimates of the cost of constructing privies and urinals in accordance therewith, shall be kept in the Municipal office and shall be open to inspection by any person at all reasonable times without charge; but no person shall be bound to construct any privy or urinal in accordance with any such model or type plan if the same be constructed in accordance with the other rules contained in this Schedule. [Sidenote: Drain.] 5. (1) A drain must be provided for every privy and every urinal. (2) Such drain must be constructed of some impervious material, and must connect the floor of the privy or urinal— (_a_) with a drain communicating with a municipal drain or sewer; or (_b_) if permitted by the Commissioners, with an impervious cesspool, the contents of which can be removed either by hand, or by flow after filtration. [Sidenote: Floor.] 6. (1) The floor of every privy and urinal— (_a_) must, if the Commissioners in any case so direct, be made of one of the following materials to be selected by the owner of the privy or urinal, that is to say, glazed tiles, artificial stone or cement; or (_b_) if no such direction is given, must be made of thoroughly well burnt earthen tiles or bricks plastered, and not merely pointed, with cement; and (_c_) must be in every part at a height of not less than six inches above the level of the surface of the ground adjoining the privy or urinal. (2) The floor of every privy and every urinal must have a fall or inclination of at least half an inch to the foot towards the drain prescribed by rule 5; and the platform must be similarly sloped towards the aperture. [Sidenote: Walls and roof.] 7. The walls and the roof (if any) of every privy and urinal shall be made of such materials as may be approved by the Commissioners: Provided that— (_a_) in the case of privies, the entire surface of the walls below the platform shall either be rendered in cement or be made as prescribed in clause (_a_) or clause (_b_) of rule 6. [Sidenote: Platform.] 8. The platform of every privy or urinal must either be plastered with cement or be made of some water-tight nonabsorbent material as prescribed in rule 6. [Sidenote: Ventilation of privies in, or adjacent to, buildings.] 9. Every privy or urinal situated in, or adjacent to, a building must have an opening, of not less than three square feet in area, in one of the walls of the privy, as near the top of the wall as may be practicable, and communicating directly with the open air. [Sidenote: Regulation of service privies constructed for use in combination with a moveable receptacle for sewage.] 10. Every privy must be constructed in accordance with the following provisions:—