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Water Storage: household sizing to rainwater math

Litres-first tools for overhead tanks and sumps, IS 1172 household sizing, and the harvesting arithmetic — plus everything in gallons for US storage.

Storing water well is a sizing problem in two parts: how much you need, and where it lives. The Indian norm is 135 litres per person per day (IS 1172), so a family of four wants roughly 540 litres a day — and because municipal supply is often intermittent, most homes pair a larger underground sump for bulk storage with a smaller overhead tank for gravity pressure. Below: a litres-first calculator for any tank, household sizing built on the standard, rainwater-harvesting and septic tools, and the guide to splitting storage between overhead and underground. Everything works in gallons too for US storage tanks.

Calculators

Sizes

Guides

Reference