The maximum monthly demand of water per head is equal to:

Correct option is D

→ Max. daily consumption = 1.8 × average daily demand
→ Max. hourly consumption for max. daily Demand = 1.5 × Average hourly consumption.
→ Max. Daily demand = 2.7 × annual average hourly demand
→ Max. weekly demand = 1.48 × Average weekly
→ Max. monthly demand = 1.28 × Average monthly.