Question

The design capacity of the main water supply pipeline to the distribution system is designed based on which of the followings? Select one: O a. Maximum daily demand O b. Maximum Hourly demand O c. Maximum minutely demand O d. Maximum Monthly demand e. Maximum Yearly demand

A service reservoir is designed to store which quantity of flow? Select one: O a. Peak daily demand O b. Daily fire Demand O c Emergency requirements O d. All of the above O e. None of the above

The population of a town is 20000, that is to be supplied with water by a pump. The average property hold 4 people. Each property consumes, on average 0.871/day. Historical data suggests a peak day factor of 1.8 and a peak hour factor of 22. Determine the design flow rate for the pump in Ls Answer:

The needed fire flow is 76380 L/min which has to be sustained for 5 hours. Maximum daily demand is 1.62 m3/s. What is the design discharge? Answer:

Answer correctly with reasonn

Answer 1

Water distribution mains are design for hourly demand.. Because water should be distributed to consumer for an few hours in a day, if we design for daily demand then it is uneconomical.

Part 2

Reservior is built for the emergency storage of water if demand is less then excess of water store in that but if demand is more the required demand the surplus water supplied by reservior to meet the demand.. In case fire breaks in the city then max water is required which is supplied by reservior

So it is design for all of the above

Part 3

Given

Population = 20000

No. Of people in each property : 4

No. Of property :20000/4 = 5000

Water required for each property : 0.87L/day

Total average water demand : 0.87*5000 =4350 l/day

Water pump design for horly demand

Design discharge = 2.2*4350 = 9570l/day

Part 4

Design discharge = max daily demand + fire demand

Fire demand = 76380L/min for 5 hour means

76380*5*60/(24*3600) = 265.2L/s = 0.265m^3/s

Fire demand = . 265+ 1.62 = 1.88m3/s