Deck 23: Landscape Irrigation

Question 1

The idea that water could be directed and relocated to help plants grow followed the cessation of the hunter and gatherer society.

Answer 1

True

Question 2

Golf courses and other lawn and tree areas are not suitable for the rapid water delivery of sprinkler systems.

Answer 2

False

Question 3

It is important to know the subsurface wetting pattern so that the areas wetted by the emitters in a trickle system can be overlapped, supplying enough water to leach away the salts.

Answer 3

True

Question 4

As the water demand for landscape irrigation grows, so do water resources.

Question 5

The trickle irrigation system is preferable anywhere large amounts of water are needed quickly.

Question 6

The irrigation water pattern falls across the landscape in a pattern determined by the type of sprinkler head.

Question 7

To calculate moving water pressure, it is necessary to know the friction loss as water rubs against the inside of the pipe.

Question 8

Automated irrigation systems save money because they only apply water in amounts that can be absorbed.

Question 9

There are three types of sprinkler heads: spray heads, rotary heads, and impact drive heads.

Question 10

Water needs are no longer guessing games.

Question 11

A 1000-square foot shrub installation that needs 1.5 inches of water each week is irrigated by a system that delivers 5.2 gpm. How long will the irrigation system run in order to deliver 1.5 inches of water?

A) 5 hours, 3 minutes
B) 8 hours, 48 minutes
C) 156 hours
D) 3 hours, 8 minutes

Question 12

The water pressure from a city water system is 60 psi. A pipe drops 15 feet from the main line to the irrigation system's control valve. What will be the static pressure at the valve?

A) 8.66 psi
B) 66.5 psi
C) 70 psi
D) 38.97 psi

Question 13

Where wind is not a predictable factor, the sprinkler arcs should be placed at a distance that is what percent of the diameter of the arc?

A) 30
B) 40
C) 50
D) 60

Question 14

What term describes the amount of water placed over a landscape?

A) precipitation
B) irrigation
C) deposit
D) flow

Question 15

What is the ideal velocity for landscape irrigation in feet per second?

A) 3
B) 4
C) 5
D) 6

Question 16

What pressure is present in a closed irrigation system when the water is not flowing?

A) dynamic
B) surge
C) head
D) static

Question 17

Spray heads can only propel water outward for what distance before the wind disrupts the pattern?

A) 14 to 16 feet
B) 18 to 20 feet
C) 22 to 24 feet
D) 26 to 28 yards

Question 18

When positioning sprinklers, the spray arcs must overlap in order to provide an even distribution of water. What amount of each sprinkler's arc actually delivers the full amount of water?

A) 2/3
B) 1/2
C) 3/4
D) 1/3

Question 19

What percent of the root zone of most plants must receive water to provide the benefits of irrigation?

A) 30
B) 40
C) 50
D) 60

Question 20

Based on their ability or inability to deliver a constant gallon per hour rate over a wide range of water pressures, how many types of emitters are available?

A) 2
B) 3
C) 4
D) 5

Question 21

____________________ is the supplying of water to land through artificial means.

Question 22

____________________ supplies water directly to the root zone of the plant.

Question 23

The movement of water going or passing through the irrigation system is called the ____________________.

Question 24

Pressure compensating and noncompensating are two types of ____________________.

Question 25

The pressure that is present at any one point in a system as a given quantity of water flows past that point is the ____________________ pressure.

Question 26

The type of sprinkler head that uses a spring-loaded arm to bump water as it flows from the head is termed an ____________________ head.

Question 27

A PVC pipe with a high schedule rating would be structurally ____________________ than one having a lower schedule rating.

Question 28

When water velocity is too high and then is stopped suddenly, a shock wave type of pressure known as ____________________ pressure results.

Question 29

____________________ systems may create water runoff problems if not set to deliver only what the soil can absorb.

Question 30

The maintenance of ____________________ systems is high because the system cannot be seen working easily, thereby requiring constant checking for leaks or plugging.