NOVEMBER 2015

CERTIFICATION PROGRAM Landscape/Turf Specialty Commercial Examination Equations

Page 1 of 2

Basic and non-irrigation equations and conversions are assumed to be known by candidates. POI refers

to Principles of Irrigation, 3nd ed. Dec. 2012. Irrigation Association. 6th ed. refers to Irrigation, Irrigation Association.

Handbook refers to Handbook of Technical Irrigation Information, Hunter, 2010. The equations are presented in the latest

IA format and may appear different from those presented in the reference material.

1 cubic meter of water = 1,000 liters 1mm = 1 l/m2 1mm = 10 kl/ha 1 liter water weighs 1 kg

PAW AW RZ × POI 2-4 AD PAW (M AD / 100) × POI 2-5

c o cET ET K POI 2-8

𝑄 =5,988 × 𝐴 × 𝐸𝑇𝑜 × 𝐾𝑐

𝑡 × (𝐸𝑎

100)

POI 5-8

𝐴 =𝑄 × 𝑡 × (

𝐸𝑎

100)

5,988 × 𝐸𝑇𝑐

POI 5-8a This space intentionally left blank.

𝑄 =5,988 × 𝐴 × 𝐸𝑇𝑐

𝑡 × (𝐸𝑎

100)

POI 5-8 𝐻 = 0.102 × 𝑃 POI 8-1

Q A V × POI 8-2 𝑉 =

1.273 × 𝑄

𝐼𝐷2

POI 8-3

2

v

VH

2 g

×POI 8-4

2 2

1 2

p 1 1 p 2 L2

V VH Z H Z H

2 g 2 g

× ×6th ed. Ch. 7 p. 233

2

z z

VH k

2 g

Z= various values depending upon equation

POI 8-8, 8-9. 8-10, 8-11

22

1

2

2

DK 1

D

POI 8-12

22

1

2

2

DK 0.7 1

D

× POI 8-13 𝐻𝑓 = 2.38 × 108 × (

100

𝐶)

1.852

×𝑄1.852

𝐷4.866×

𝐿

100

POI 8-7

𝑄 = 𝐾𝑥 × 𝑃𝑥6th ed. Ch. 7 p. 253 0 0

Q P

Q P

6TH ed. Ch. 7 p. 254

NOVEMBER 2015

CERTIFICATION PROGRAM Landscape/Turf Specialty Commercial Examination Equations

Page 2 of 2

𝑃𝑅 =60×𝑄

𝐴r s

2

s

t S

Vario u s A va lu es

A = S S

A = 0.866 S

A = 0.8 D S

×

×

× ×

POI 3-2, 3-4, 3-5

This space intentionally left blank.

P(Kw) =Q × H

102

POI 9-2 P(Kw) =

Q × H

102 × (Ep

100)

POI 9-3

a s f vpN PSH a H H H H POI 9-1

2 2

1 1

Q N

Q N

POI 9-5

2

2 2

1 1

H N

H N

POI 9-5 kW pump2

kW pump1= (

N2

N1)

3

POI 9-5

2 2

1 1

Q D

Q D POI 9-6

2

2 2

1 1

H D

H D

POI 9-6

kW pump2

kW pump1= (

D2

D1)

3

POI 9-6 V I R × POI 10-1

𝑃𝑠 =5.19 × (𝑣𝑒𝑙𝑜𝑐𝑖𝑡𝑦) × (𝑙𝑒𝑛𝑔𝑡ℎ 𝑜𝑓 𝑠𝑡𝑟𝑎𝑖𝑔ℎ𝑡 𝑝𝑖𝑝𝑒)

(𝑣𝑎𝑙𝑣𝑒 𝑐𝑙𝑜𝑠𝑖𝑛𝑔 𝑡𝑖𝑚𝑒)

POI 8-15 m

c

A DIN

ET POI 5-3

net a cIR IN ET × POI 5-4

similar

net

gross

a

IRIR

E / 100 POI 5-4

grossIR

RT 60PR

× POI 5-5 This space intentionally left blank.