Introductory questions to water supply scheme

1. sanjitkc93@gmail.com Public Health Engineering Jigme Namgyel EngineeringCollege
Chapter 1 Introduction
1. How will youestimate the quantityof waterrequiredbyDewathangtownwhilearranginga
watersupplyscheme forthe same?
2. What are the variouspurposesforwhichprovisionshouldbe made inthe average dailyper
capita demandina watersupplyscheme?
Give the approximate breakdownforeachof these purposesif the average dailydemandis270
litres.
3. What ismeantby the term “percapita demand”?How isit estimated?Whatvaluesof percapita
demandwouldyourecommendfor:
i. A small townwitha population of 50,000
ii. A small citywitha populationof 1 to 2 lakhs
iii. A verylarge citywitha populationof 5 lakhs.
State the reasonsin supportof your answer.
4. List the factorsthat influencespercapitademand.
5. Give a reasonable estimatesof average dailyconsumptionof waterfora residential townof
50,000 population.Suggestapossible break-upof consumptionondifferentheads.
6. What ismeantby the variationsinthe rate of demand?Whatare the effectsof these variations
on the designof variousunitsof a watersupplyscheme?
7. What ispeak-demandandhowdoesitaffectthe designof watersupplysystem?Sketchthe
fluctuationsindemandfortypical Bhutanese conditions.
8. What do youmeanby continuousandintermittentsystemof watersupply?Whatare their
relative advantagesanddisadvantages?
9. For a city of population1,00,000, findthe followinginconnectionwiththe waterdistribution
system:
i. Dailywaterdemand
ii. Dailyvariationinwaterdemand
iii. Monthlyvariationinwaterdemand
iv. Hourlyvariation
10. What ismeantby “design periods”and “population forecasts”?Whyisthe populationforecasts
necessaryinthe designof publicwatersupplyschemes?Discussthe different methods
employedforthe purpose andtheircomparative meritsanddemerits.
11. “Incrementalincreasemethod of estimating population combined theadvantagesof othertwo
methodsi.e.arithmetical increase and geometricalincrease”. Explainthe statement.
12. Give the reasonsforthe following:
i. The drinkingwatershouldbe possessahighdegree of purity
ii. The water demandchangesfromseasontoseasonandfrom hourto hour
iii. “Intermittentsupplysystem”and“policyof metering”are debatableandshould
be usedonlyafter