MODULE 3 PRIVATE WATER SUPPLY SOURCES

Question 1

What are the available water supply sources for private domestic use?

Answer 1

springs
wells
rainwater

Question 2

What are the factors that affect springs and wells?

Answer 2

ground formations
ground water

Question 3

The accumulated ground water tends to flow towards a natural outlet referred to as a _____

Answer 3

spring

Question 4

Water lying above the impermeable layer is known as _______ and its surface is referred to as the ____.

Answer 4

ground water
water table

Question 5

The sections of the ______ relative to the availability of ground water can define the suitability of the type of private water supply source to be used.

Answer 5

ground formations

Question 6

In most conditions, ______ are shallow wells with water supply just a few meters from the ground surface.
In most

Answer 6

spring water sources

Question 7

A _____ structure that serves as a collector for spring water.

Answer 7

spring box

Question 8

_____ are holes or shafts sunk into the earth to obtain water from an aquifer.

Answer 8

wells/water wells

Question 9

The design & construction of a well requires:

Answer 9

a. scientific knowledge of hydrogeology
b. common sense and
c. practical experience

Question 10

What are the Types of Wells?

Answer 10

dug well
bored well
driven well
drilled well

Question 11

___ well is a well 0.90 to 6.00 meter in diameter dug through soft upper soil. The sides may be of masonry or concrete to prevent from caving-in. It is necessary that the well should be impervious to a depth of at least 3.00 meters.

Answer 11

dug

Question 12

A _______ is constructed using either hand or power driven earth auger. A well casing is lowered to the bottom of the hole. Cement grout is poured into the gap between the hole and the casing to prevent
contamination.

Answer 12

bored well

Question 13

A ______ is done by forcing into the earth a 60 to 90 cm long piece of perforated steel tube attached to a pointed screen called a “drive point”

Answer 13

driven well

Question 14

A drilling rig is used to drill the well hole and then a casing pipe is forced down the hole to prevent it from caving-in. When a water- bearing stratum of sufficient capacity is found, a well screen is set in place to permit the water to flow into the casing and to hold back the fine material.

Answer 14

drilled well

Question 15

The depth of a drilled well is
limited only by the distance one must dig to obtain an adequate supply of fresh water, even down to 450 meters (equivalent to a 130 storey building).

Answer 15

Truck Mounted Drilling Machine

Question 16

______ ARE DEVICES USED TO WASTE THE INITIAL WATER COMING OFF THE COLLECTION SURFACE BEFORE BEING ALLOWED TO FILL THE TANK OR CISTERN.

Answer 16

roof washers