The Consumptive Pattern throughout the Day

The Consumptive Pattern throughout the Day

Annual average demand is not sufficient for the design of various component of a water supply scheme. There are wide variations in the use of water in different season, in different months of the year, ¡n different days of the months, in different hours of the day.

The consumptive patterns of water used will produce hourly variations in the demand. in the absence of actual field data, the following pattern of consumption may be assumed Until data becomes available:

The daily demand varies throughout the day with peak demands in early morning and late afternoon.

Maximum hourly consumption is generally taken as 150% of the days normal consumption rate.

Maximum hourly consumption = 1.5 x average hourly consumption

Provision for Growth in Population

When estimating the population figures for a water supply scheme, the provisions have to be made for the future growth the population, as calculated by the equation given below.

Design Population

Where,

P = present population

r = Population growth rate (r=1 .5% rural, and 2,5% urban)

n = number of years forecasting