3-46. For a normal field water supply, what type of
water source is the most accessible?
3-47. In a swiftly flowing stream, what type of dam
can be constructed to protect an intake screen
without impounding the water?
Wing or baffle
Ripple or wing
3-48. The quality of water from a muddy stream can
be improved in which of the following ways?
By sinking shallow wells
By digging intake galleries
By filling unneeded trenches
By digging outtake galleries
3-49. Moisture is held beneath the surface of the
earth in what total number of zones?
3-50. Groundwater is the term used to describe
underground water in what zone?
3-51. In a driven well, the sections of well pipe are
delivered in lengths of what size?
2. 10 feet
3-52. When developed properly, springs yielding a
minimum of how many gallons per minute can
be used as a source of field water?
3-53. Refer to figure 9-6. What condition exists that
requires the intake screen to be surrounded by
The inlet hose is on a steep slope
The turbidity of the water is very high
The water source does not cover the
screen by at least 4 inches
The water contains a large amount of
3-54. Little or no consideration is given to the
development of a thermal spring as a water
source for which, if any, of the following
1. The high cost involved
2. The unreliability of such a spring
3. The likelihood of heavy mineral
4. None of the above
3-55. In the development of a spring, an impervious
type of permanent structure should be used to
protect the water source against
water from building drains only
2. surface water drainage only
water from all sources other than the
3-56. There is a total of how many classifications of
3-57. A well that is dug is usually 3 feet in diameter
or more and within what depth range?
10 feet to 30 feet
15 feet to 40 feet
20 feet to 40 feet
25 feet to 50 feet
3-58. A well can normally be bored within what
maximum depth without fear of a cave-in?
3. 50 feet