(_b_) For wheel traffic the size and the nature of the entrance culverts are left to the discretion of the Chairman. Balcony. 7. No balcony shall be erected in any road, street, or lane which is not maintained by supports which in the opinion of the Chairman are sufficiently strong. [Sidenote: Distance between building line and street alignment.] 8. In any road laid out after these rules come into force in which continuous building is allowed, the distance between the building line and the street alignment shall not be less than 4 feet. PART III.—MASONRY BUILDINGS GENERALLY. [Sidenote: Plinth.] 9. The plinth of any new building must be at least one foot above the level of the centre of the nearest road, provided no one is required to build a plinth higher than three feet above the ground. [Sidenote: Outer walls.] 10. The outer walls of a masonry building must be constructed of burnt brick or some other hard and incombustible substance. [Sidenote: Walls in building of more than one storey.] 11. If a masonry building exceeds 30 feet in height, all except the topmost storey should be built of well burnt bricks and lime mortar. [Sidenote: Terrace roof.] 12. No part of a flat terrace roof or part of a parapet shall extend beyond the outer face of the wall on which it is supported. PART IV.—DWELLING-HOUSES AND OTHER DOMESTIC BUILDINGS. [Sidenote: Proportion of site for dwelling-house which may be built upon.] 13. The total area covered by all the buildings (including verandahs erected or re-erected on any site used for a dwelling-house) shall not exceed three-fourths of the total area of the site. But in the case of rebuilding this rule will not apply in a case in which the site is less than 500 square feet. [Sidenote: Open space in rear of building.] 14. Except in localities where the erection of only detached buildings is allowed, there must ordinarily be, in the absence of any specific permission of the Chairman to the contrary, in the rear of every domestic building an open space extending along the entire width of the building of not less than 10 feet. [Sidenote: Interior courtyards and outwards open spaces to be raised and kept open.] 15. Every interior courtyard and every open space prescribed by rule 15 must be raised at least six inches above the level of the centre of the nearest street or road so as to admit of easy drainage into the street. 16. All living rooms should be so placed as to get light and air. For that object all such rooms should have at least one window opening to the outer air direct, or into a verandah. [Sidenote: Height of room.] 17. The height of the room on the basement floor shall be not less than nine feet. [Sidenote: Water spouts.] 18. Water spouts should be so arranged as to discharge water in a Municipal drain or on land belonging to the proprietor of the house to which the water spout is attached.