Water Demand & Tank SizingPick the building type and the number of users. Get the daily water demand, the drinking and flushing split, the sump and overhead tank sizes and the pump, drawn on a live building section.

SheetT-33

MethodNBC per-head demand

Unitslitres, m

By@smart_tools_every_week

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Building type

Units (flats, rooms…) Users per unit

Overhead tank, share of a day % Sump, days of demand

Building height m Pump fills tank in h

Tank water depth m Pump efficiency %

Users per unit: 5 for a flat, 1 for an office desk, 1 for a bed or seat. Tank sizes round up to the next common size. Pipe friction is taken as 20% of the lift.

Daily demand–

Flushing water–

Overhead tank–

Sump–

Building section

Where the water goes

Sizing summary

Item	Value	How