22. Water Tanks
A tank constructed or fitted in connection with a building and intended to be used for the storage of rainwater shall comply with the following requirements—
(a) it shall be provided with an overflow pipe so placed and so fitted as not to allow animals to enter through it and capable of discharging to a drain or watercourse;
(b) the tank shall be provided with a solid and close fitting cover so constructed and fitted as to exclude all polluting matter mosquitoes and the like and if such cover is fixed it shall have a manhole fitted with a proper iron cover and of sufficient size to allow the tank to be entered and cleaned and it shall be provided with a sufficient ventilator the open end of which shall be fitted with a cover of copper gauze;
(c) the tank shall be constructed or lined with an impervious material and shall be watertight and of sufficient strength to resist all internal and external forces likely to be applied to the tank.