Water Demand Calculation

Ref: SPAN (Suruhanjaya Perkhidmatan Air Negara) Guidelines

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Production Demand = (Pop × Per Capita + Comm + Ind) × (1 + NRW%)

Ref: SPAN (Suruhanjaya Perkhidmatan Air Negara) Guidelines

Peak Day = Production × Peak Day Factor

Peak Day Demand

Peak Hour = Production × Peak Hour Factor

Peak Hour Demand

Population & Domestic

Design Population (persons)

Projected population for design horizon

Per Capita Demand (L/person/day)

SPAN: 200–250 L/person/day

Non-Revenue Water (NRW) (%)

National target <25%. Current avg ~35%

Peak Factors

Peak Day Factor

Typical 1.2–1.5

Peak Hour Factor

Typical 1.5–2.5

Additional Demand

Fire Flow Requirement (m³/hr)

Per BOMBA/UBBL requirements

Commercial Demand (m³/day)

Non-domestic commercial usage

Industrial Demand (m³/day)

Industrial process water

Disclaimer: This output is an engineering calculation aid only. Water supply designs must comply with SPAN UTG and be endorsed by a registered PE. Contact local water operator for final approval.