(1) Location of Septic Tanks and Sub-Surface absorption systems A sub-soil dispersion system shall not be located within 18 meters from any source of drinking water. It shall also be as removed from the nearest habitable building as economically fe~ible but not w1thin 2 meters thereof so that there is no damage to the structures.
(2) Other Requirements -
(a) Dimensions of septic tanks- Septic tanks shall have minimum width of 7 5 centimetres and minimum depth of .e 222 (242) one meter below the surface level and a minimum liquid capacity of one cubic meter. Length of tanks sh.all be 2 to 4 times the width;
(b) septic tanks may be constructed of brick work /stone masonry/ concrete or other suitable materials as approved by the Agency;
(c) under no circumstances should effluent from a septic tank be allowed into an o~n channel drain or body of water without adequate treatment;
(d) minimum nominal diameter of pipe used shall be 100 omillimetres. Further at junctions of pipes in manholes, direction of flow from a branch connectiop should not make 0 an angle exceeding 45 degrees with the direction of flow in the main pipe; •
(e) the gradients of land drains, under-drainage as well as the bottom of dispersion trenches and soak ways should be between 1: 300 and 1: 400;
(f) every septic tank-shall be provided with ventilating pipe of at least 50 millimetres diameter. The top of the pipe shall he provided with a suitable case of rr.iosquito proo( wire mesh.
The ventilating pipe shall extend to a height which would cause no smell nuisance • to any building in the area.
Generally, the ventilating pipe m~y extend to a height of 2 meters when the septic tank is 'located at a distance of 15 meters from the nearest building and to a'height of 2 meters above the top of the building when it is locat~d closer t}lan 1 S " . . . - .
meters; .
(g) when the disposal of septic tank effluent is to seepage pit, the seepage pit may be of any suitable shape with the least cross section dimension of 90 centimetres and not less than 100 centimetres in depth below the invert level of the inlet pipe.
The pit may be lined with stone, ·brick or concrete blocks with dry open joints which should be backed with at least . 7 .5 centimetres of clean coarse aggregate. The lining above the inlet level should be finished with mortar. In the case of pits of large dimensions, the top portion may be • narrowed to reduce the size of the reinforced cement concrete cover slabs.
Where no lining is used, specially near trees, the entire pit should be filled with loose stones. A masonry ring may be constructed at the top of the pit to prevent damage by flooding C>
96.
222 (243) of_ the pit by surface run off. The inlet pipe may be taken down to a depth of 90 centimetres from the top as an anti mosquito measures; and
(h) when the disposal of septic tank effluent is to a dispersion trench, the dispersion trench shall be 50 to 100 . centimetres deep and 30 to 100 centimetres wide excavated to gradient and shall be provided with 10 to 25 centimetres of washed gravel or crushed stone. Open joints placed inside the trench shall be made of unglazed earthenware pipes clay or concretes • and shall have minimum internal diameter of 75 to 100 millimetres. Each dispersion trench should not be longer than 30meters and trenches should not be placed closer than 1 .8 meters.
Staircase.- (1 )The minimum clear width and maximum riser of Stair cases . for buildings shall be as given in sub-rule (2) to (4).
(2) Minimum Width: The minimum width of staircase shall be as follows:- . (i) Residential buildings (Dwellings)
(ii) hotel buildings.
(iii) Assembly buildings like auditorium, theatres, cinemas and other public buildings less than 24 mtrs. in height
(iv) Educational buildings-
0.90 meters l.50meters I.SO meters ( a) " up toi24 'm in height 1.50 meters
(b) more than 24 m in height 2.00 meters
(v) Institutional buildings
(a) tip to 10 beds 1.50 meters
(b) more than 10 beds 2.00 meters ( vi) AU other buildings 1.50 meters
(3) The landing width shall be a minimum of twice the tread plus
25centimeters.
(4) Minimum Tread. The minimum width of tread without nosing shall be 25 centimetres for residentiaL buildings. The minimum width of tread for other buildings shall be 30 centimetre.
(5) Maximum Riser-The maximum height of risers shall be 17 centimetres for residential buildings and 15 centimetres for other buildings and these shall be limited to 15 numbers per flight. •
(6) Head Room. The minimum head-room in a passage under the () 222 (244) landing• of a staircase shall be 2.20 meters. The minimum clear head-room in any staircase shall be 2.20 meters ...
97. Roofs -(I) The roof of a building shall be so constructed or framed as to permit effective drainage . of the rain water there from by means of .
sufficient rain-water pipes of adequate size, wherever required, so • arranged, jointed and fixed as to ensure that the rain-water is carried away from the building without causing dampness in any part of the walls or foundations of the building or those of an adjacent building. •
(2) The Agency may require rain-water pipe·s to be connected to a drain or sewer or a covered channel beneath the public footpath or in any other approved manner.
(3) Rain-water pipes shall be affixed to the outside of the external walls of the building or in recesses or chases cut or formed in .such external walls or in such other manner ao may be approved by the 1 Agency.
( 4) Rain/Roof water harvesting method shall have to be provided on => all type of buildings having plot size more than 140 Square m~ter as per the options mentioned in APPENDIX- A-13, A-14 & A-15.
(5) In the scheme area along wit~ the composite building permission, a ·-security deposit as mentioned below shall be deposited by the . applicant based on the area of the plot to ensure roof top/ pebble bed / service well/ water harvesting:- S.No. Area of the plot (Sqmt.) Rate (Rs.)
1. 0 to 1,000 . 25,000/- ·:> '2. 1,001 to 6,000 50,000/-
3. Above 6,000 1,00,000/- After the completion of building the applicant shall inform the building officer regarding the implementation of water harvesting. After physical verification if it is found that rain water harvesting system is installed ·effectively, in. that case the above security deposit shall be returned to the · applicant.
(V) Lighting and Ventilation
98. Lighting and Ventilation of Rooms -( 1) Every room shall, for the admission of light and air, have one or more openings, such as windows and ventilators opening directly to the external air or into an open verandah.
1={~ ~, ~ 14 1=fri:r 2016 222 (245)
(2) Where the light and ventilation requirements are not met through day lighting and natural ventilation, the same shall be ensured through artificial lighting and mechanical ventilation as per PART VIII- Building Services Section 1. Lighting and Ventilation of the. Code as revised from time to time.
(3) Notwithstanding the area of openings mentioned under sub-rue (2), the minimum aggregate area (see Notes 1 to 3) of such openings excluding doors inclusive of frames shall not be less than one-tenth of the floor area~ Note 1: If a window is partly fixed, the open-able area shall be counted.
Note 2: No portion of a room shall be assumed to be lighted, if it is more· than:7 .5 meters away from the opening.
Note 3.- Area of openings as given in this sub-rule shall be increased.
by 25 percent in case of a kitchen.
(VI) Lift.