3. (1) If a building is situated at the side of a road no portion of the building shall be higher than the distance from its base to the opposite side of the street. _Explanation._—If a building be placed at the edge of the road its height must not exceed the width of the street; but if the building or one or more of its stories be set back, the height of the building may be increased as much as the basement of the increased portion is distant from the adjoining edge of the road. (2) In the case of any building which is re-erected in a road in existence at the time when these rules come in force which is less than 25 feet wide but more than 20 feet, the proportion of height to width may be as five to four up to a limit of 25 feet. (3) Notwithstanding anything contained in sub-rule (1) or sub-rule (2) the Chairman may give permission for building houses in the cases of roads or lanes of less than 20 feet wide, after personal inspection in each case. (4) If a building is situated on a corner plot, the height of the building shall be regulated by the wider of the intersecting streets. [Sidenote: Level of floor.] 4. The floor or lowest floor of every building erected or re-erected from the ground-level must be constructed at such level as will admit of— (_a_) The construction of a drain sufficient for the effectual drainage of the building, and placed at such level as will admit of the drainage being led into some Municipal drain at the time existing or projected. (_b_) The provision of the requisite communication with some drain into which the drainage may lawfully be discharged, at a point in the upper half of such drain, or with some other outfall into which the drainage may lawfully be discharged. [Sidenote: Building over Municipal drain.] 5. No foundation of any building shall be placed over any Municipal drain, nor shall any superstructure whatever, whether verandah, balcony, eave, or any other portion of the building, project beyond a vertical line drawn through the centre of the drain, and if there be no drain, not beyond 1 foot 6 inches from the edge of the road. But no material or structure of any kind at or below the level of 6 feet from the ground, with the exception of entrance culverts, allowed under Rule 7, shall project over any part of a drain. [Sidenote: Entrance culverts.] 6. The applications which are filed for entrance culverts must contain the following particulars:— (1) Length. (2) Breadth beyond drain. (3) Ventage allowed. (_a_) Ordinarily the following dimensions will be allowed for foot traffic:— (1) two feet. (2) ten inches. (3) same size as area of drain up to a maximum of three square feet. The number of entrance culverts in any building shall not exceed the number of separate shops or dwelling-houses. The intervening space between culverts over a drain shall not be covered over by planks, stone slabs or any other substance.