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→Calculating Water Capacity
Water consumption can be reduced using (descending order) water-efficient shower heads, toilets, dishwashers, clothes washers, and automatically closing taps. Low-flow shower heads alone can reduce water usage by 30%. Older shower heads deliver 4 to 5 gallons (15.1 to 18.9 litres) of water per minute. However, the USA Energy Policy Act of 1992 sets maximum water flow rates at 2.5 gallons (9.5 litres) per minute at a standard residential water pressure of 80 pounds per square inch (552 kilopascals).
Before doing the above test, I had settled on 25 gal/person/day as a design goal. Afterwards, and because water capacity is so critical for a live-aboard, I increased this to 60 gal/person per day overall. With a 250-gal water tank, Sharina would have this gives a base cruising capacity of two days for two people. A 500-gal tank would provide the same for four people. A watermaker would have to supplement this for extended cruises
The fresh water tank should have an overflow outlet overboard. Boats have been sunk at the dock when connected to shore water that overflowed the tank in one way or another.