What is the standard water demand for residential buildings?

135 lpcd for Low Income Groups (LIG) and 200 lpcd for High Income Groups (HIG) according to Clause 4.1.

What is the per capita water requirement for office buildings?

45 liters per head per day (Table 1).

How many washbasins are required in an office building?

1 for every 25 persons or part thereof (Table 4).

What is the water demand for hospitals?

340 lpcd for hospitals with up to 100 beds, and 450 lpcd for those with more than 100 beds (Table 1).

IS 1172

: 1993

Code of basic requirements for water supply, drainage and sanitation

CurrentEssentialCode of PracticeBIMMEP · Building Planning and Design

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This code lays down the basic requirements for water supply, drainage, and sanitation in buildings. It provides essential per capita water consumption norms and specifies the minimum number of sanitary fitments required for different types of occupancies.

Stipulates basic requirements for water supply, drainage, and sanitation facilities in buildings to ensure hygiene and public health.

Quick Reference Values

Residential water demand (LIG/EWS)135 lpcd

Residential water demand (HIG)200 lpcd

Office building water demand45 lpcd

Hospital water demand (up to 100 beds)340 lpcd

Hospital water demand (over 100 beds)450 lpcd

Day schools water demand45 lpcd

Hotels water demand (up to 3 star)180 lpcd

Practical Notes

The 135 lpcd requirement for LIG housing comprises 90 liters for domestic use and 45 liters for flushing.

When computing total water demand for large projects, always account for firefighting, HVAC makeup water, and landscaping separately, as IS 1172 baseline values primarily cover domestic needs.

Population estimates for office buildings should be based on actual seating or 1 person per 10 square meters of floor area if exact layouts are unknown.