Water Supply

Question 1

Sources of Water

Answer 1

1. Rain
2. Land Surface
3. Ground Water

Question 2

is a relatively unimportant source of water

Answer 2

Rain

Question 3

water obtained from the land surface originates from rain water
Examples: Impounded Reservoirs, Rivers and Streams, Tanks and Sea Water

Answer 3

Surface Water

Question 4

is the cheapest and most practical source of water
Example: well and springs

Answer 4

Ground Water

Question 5

Advantages

Answer 5

a. Free from pathogenic agent
b. Usually requires no treatment
c. Supply from deep wells is likely to be certain even in dry season

Question 6

Disadvantages

Answer 6

a. May have high mineral content
b. Requires pumping out of the water source

Question 7

Contamination of Water

Answer 7

a. At the source itself
b. By the addition of impurities during transit from source to reservoir
c. During distribution through cracks and joints pipes
d. When water is stored in underground or overhead storage tanks
e. Unclean containers are dipped in the water container
f. Unclean glasses are used to serve

Question 8

Hazardous of Water Pollutions

Answer 8

Biological Hazards
Chemical Hazards

Question 9

water-borne diseases ca be caused by ineffective agents by the consumption that could be present, examples: viruses. Bacteria, protozoa

Answer 9

Biological Hazards

Question 10

pollutants derived from industrial and agricultural wasted, for examples: detergents, solvents, heavy metals

Answer 10

Chemical Hazards

Question 11

How to keep the water safe to use?

Answer 11

1. Purification
2. Chlorination
3. Boiling

Question 12

the process of extracting some substance present in the water

Answer 12

Purification

Question 13

A step in large scale purification of water which supplements sand filtration

Answer 13

Chlorination

Question 14

kills pathogenic bacteria but has no spores and certain viruses except in high doses

Answer 14

Chlorine

Question 15

water must be boiled vigorously for 5-10 minutes

Answer 15

Boiling