Shopping Mall Water Tank Sizing
In the design of water tank capacity, normally there are two methods, which are volume estimated by quantity of sanitary fittings or occupancy. For commercial building such as shopping mall, I found that sizing by both of these methods will have a big different of water tank capacity because volume due to the sanitary fittings at the fewer toilets would be greatly small if compared to the high occupancy for the whole mall.
In term of sizing the shopping mall, what shall be the correct method ? Please advise. Thanks