Irrigation License Exam

Front 1

What is irrigation?

Back 1

The application of water at a predetermined rate over a prescribed area of land for the purpose of sustaining the water requirements of turf, vegetation or trees.

Front 2

PVC

Back 2

Polyvinyl chloride

Front 3

ID

Back 3

Inside diameter

Front 4

OD

Back 4

Outside diameter

Front 5

SDR

Back 5

Standard dimensional ratios

Front 6

PE

Back 6

Polyethylene

Front 7

IPS

Back 7

Iron pipe size

Front 8

NPS

Back 8

Nominal pipe size

Front 9

MIPT

Back 9

Male iron pipe thread

Front 10

FIPT

Back 10

Female iron pipe thread

Front 11

PSI

Back 11

Pounds per square inch

Front 12

GPM

Back 12

Gallons per minute

Front 13

How much does 1 gallon of water weigh?

Back 13

8.34 pounds

Front 14

WT

Back 14

Wall thickness, OD-ID=WT

Front 15

Absorption rate

Back 15

Infiltration rate of water into soil

Front 16

Precipitation rate

Back 16

PR (in/hr) = 96.3*Total GPM ÷ total area

Front 17

Maximum velocity of water allowed in PVC pipe?

Back 17

5 fps (feet/second)

Front 18

Maximum velocity of water allowed through copper pipe?

Back 18

9 fps (feet/second)

Front 19

Design pressure?

Back 19

The pressure required to operate the irrigation system, not actual pressure.

Front 20

A _________ primer must be used in all new irrigation systems installed using PVC pipe and fittings.

Back 20

Colored

Front 21

The Irrigator Advisory Council is composed of _____ members that are appointed by the commission.

Back 21

9

Front 22

How many of the members of the Irrigators Advisory Council must be licensed irrigators?

Back 22

6

Front 23

How many of the members of the Irrigators Advisory Council must be representatives of the public?

Back 23

3

Front 24

A ___________ of the council constitutes a quorum for conducting business.

Back 24

Majority

Front 25

Electric automatic valves are normally ____________.

Back 25

Closed

Front 26

Hydraulic automatic valves are normally ___________.

Back 26

Open

Front 27

What type of pipe is most commonly used to connect the city main to the water meter?

Back 27

Type K copper

Front 28

Is PE pipe flexible or rigid?

Back 28

Flexible

Front 29

Is PVC pipe weaker or stronger than PE?

Back 29

Stronger

Front 30

Slope formula

Back 30

%Slope = Rise/Fall*100 ÷ Run

Front 31

What is the loss of pressure for every foot of elevation change?

Back 31

.433 PSI

Front 32

What is water hammer?

Back 32

A standard plumbing term used to describe the surge of pressure in all types of plumbing systems.

Front 33

T or F: System design begins with the selection of products for the application of moisture.

Back 33

True

Front 34

T or F: Operating pressure that is above or below the desirable range for a spray head is a direct result of poor system design.

Back 34

True

Front 35

T or F: Head spacing is dependent upon nozzle size, spacing pattern, wind velocity and distribution profile.

Back 35

True

Front 36

T or F: Each manufacturer provides nozzle performance tables indicating diameter of coverage.

Back 36

False, radius not diameter is provided

Front 37

T or F: Three types of rotary popups are ball drive, great drive and popper.

Back 37

False, impact not popper

Front 38

What is a cross connection?

Back 38

A direct arrangement of piping which allows the potable water supply line to be connected to a line which contains non-potable water (a contaminant).

Front 39

The undesirable reversal of the flow of water or mixtures of water and other undesirable substances from any source into the potable water system is known as what?

Back 39

Backflow

Front 40

_______ occurs when the user system is at a higher pressure than the supply water systems allowing undesirable substances to be "pushed" back into the potable water system.

Back 40

Backpressure

Front 41

__________ occurs when negative or reduced pressure exists in the supply piping allowing undesirable substances to be "drawn" into the potable water supply.

Back 41

Backsiphonage

Front 42

What is the most famous cross connection case?

Back 42

The Holy Cross Football Team Hepatitis Incident

Front 43

The degree of ________ is based on the fluid or other substance that may backflow into the supply piping system.

Back 43

Hazard

Front 44

A non-health (non-toxic) hazard cross connection is any point on a water supply system where a _____________ substance may come in contact with potable water aesthetically affecting the taste, issue or appearance of the water.

Back 44

Polluting

Front 45

A health hazard (toxic) cross connection is any point on a water supply system where a __________ substance may come in contact with potable water crating an actual health hazard, causing sickness or death.

Back 45

Contaminating

Front 46

AVB (atmospheric vacuum breaker)

Back 46

Install vertically 6" above highest outlet. No constant pressure (no valves upstream)

Front 47

PVB (pressure vacuum breaker)

Back 47

Install vertically 12" above highest outlet. 2 test cocks, 2 flow controls.

Front 48

DCA (double check assembly)

Back 48

Install vertically or horizontally, can be below grade, 4 test cocks, 2 flow controls

Front 49

RP (reduced pressure assembly)

Back 49

Install horizontally 12" above grade, 4 test cocks, 2 flow controls, recommended when using fertilizer injector

Front 50

What is the most common cross connection?

Back 50

Garden hose

Front 51

What is continuous pressure?

Back 51

Periods over 12 hours at a time

Front 52

What are the five basic products used for protection of cross connections?

Back 52

Air gap, AVB, PVB, DCA, RP

Front 53

What is the benefit of a strainer preceding a backflow preventer?

Back 53

Protect the check valves of a backflow preventer from fouling due to foreign matter and debris which may be flowing through the line

Front 54

A zone or system in which all heads have similar precipitation rates is said to have __________ precipitation rates.

Back 54

Matched

Front 55

To achieve matched precipitation rates in each zone, you must determine what four things?

Back 55

Radius of coverage, flow rate or GPM, heads pacing and row spacing, arcs of coverage

Front 56

As the spray arc doubles so should the ______.

Back 56

Flow

Front 57

In a square pattern the row spacing equals the __________ __________.

Back 57

Head spacing

Front 58

On a triangular pattern the row spacing equals head spacing x _______.

Back 58

0.866

Front 59

Single head method, square pattern

Back 59

PR = GPM of full circle head X 96.25 ÷ head spacing X row spacing

Front 60

Single head method, triangular pattern

Back 60

PR = GPM of full circle head X 96.25 ÷ head spacing X (head spacing X .866 = row spacing)

Front 61

Total area method

Back 61

PR = total gallons (GPM) X 96.25 ÷ total area (sq ft)

Front 62

Catch can method

Back 62

PR = avg. inches/hr, add and divide cups multiply by parts of an hour

Front 63

Drip precipitation rate

Back 63

231.1 X dripper flow rate (GPH) ÷ dripper spacing X dripline spacing

Front 64

T or F: An anti-siphon vacuum breaker will protect against a backpressure backflow condition.

Back 64

False

Front 65

In a properly installed air gap the vertical distance between the supply pipe and the flood level rim should be _____ times the diameter of the supply pipe, but never less than ______ inch.

Back 65

2, 1

Front 66

T or F: row and head spacing are the same.

Back 66

False

Front 67

T or F: "fill-in" heads should always be at the same spacing as the rest of the heads.

Back 67

False

Front 68

T or F: when placing heads, it is not necessary to consider trees and other obstacles in the area to be watered.

Back 68

False

Front 69

One acre foot of water is equal to how many gallons?

Back 69

385,829

Front 70

How many square feet are in am acre?

Back 70

43,560

Front 71

If pipe size increases, velocity will ________________.

Back 71

Decrease

Front 72

A gallon of water contains how many cubic inches?

Back 72

231

Front 73

Run time formula:

Back 73

RT = R X 60 min ÷ precip rate X DW

R = plant requirement, DW = days/week to water

Front 74

T or F: shrub heads should never be placed more than 4 get above the finish grade.

Back 74

True