When planning for the overhead tank, it is important to make sure that the water pipe sleeves are carefully planned within the formwork to have proper water inlet and outlet points. If there is breaking or hacking of the concrete after the overhead tank has been casted, it becomes diffcult to stop the water leakage from pipe inlets and outlets.
It is also essential to use potable water friendly materials in the waterproofing of the tank so that there are no adverse chemical effects, & the stored water remains fit for human use.