The 'peak factor' in water supply design relates:
Choose the correct answer
Highest annual rainfall to lowest
Peak flow demand to average flow demand — critical for sizing water supply distribution systems and service reservoirs
Stream peak to baseflow
Flood peak to ordinary flood
Correct Answer
B. Peak flow demand to average flow demand — critical for sizing water supply distribution systems and service reservoirs
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Peak factor: ratio of peak demand to average demand. Hourly peak factor: 1.5–2.0 × daily average (used for distribution pipe design). Daily peak factor: 1.2–1.5 × annual average (used for treatment plant and service reservoir design). Weekly and monthly peaks also considered. Storage requirement = (daily peak − average) × hours of peak.
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