Page 330 - TORO PRODUCT CATALOGUE NOV_2019

Drip Equations
Number of emitters per plant
Thermal effects on dripline
For recurring, ambient temperatures above 23°C, multiply pressure rating of selected tubing by the appropriate FACTOR from the table below. Result will be the temp-corrected maximum pressure rating for the tubing selected. For temperatures not shown but between 23°C and 60°C, interpolate to obtain the temp-corrected maximum pressure. Use this information to select the appropriate pressure regulator to assure tubing life expectancy and warranty coverage.
Emitters per plant =
canopy area (square meters) x 0.75 wetted area per emitter (square meters)
Wetted Area per Emitter
Soil Type
Diameter (meters)
Area (meters2)
Sand
0.6-0.9
0.3-0.7
Sandy Loam
0.9-1.4
0.7-1.5
Loam
0.9-1.5
0.7-1.9
Clay-Loam
1.2-1.8
1.2-2.6
Clay
1.5-2.1
1.9-3.5
°C
Factor
23
1.00
27
0.92
32
0.81
38
0.70
43
0.60
49
0.45
54
0.32
60
0.18
Flow per zone
Flow per zone (lpm) =
total number of drippers x dripper flow rate (lph) 60 (minutes)
Precipitation Rate for Evenly Spaced Single Laterals and Emitters
Precipitation Rate for Evenly Space Drip Line (mm/hr)
Emitter Flow (Lph)
Emitter Spacing (cm)
Spacing between Drip Lines (cm)
30
40
50
75
100
1.2
30
13.3
10.0
8.0
5.3
4.0
1.2
50
8.0
6.0
4.8
3.2
2.4
1.2
75
5.3
4.0
3.2
2.1
1.6
1.5
30
16.7
12.5
10.0
6.7
5.0
1.5
50
10.0
7.5
6.0
4.0
3.0
1.5
75
6.7
5.0
4.0
2.7
2.0
2.4
30
26.7
20.0
16.0
10.7
8.0
2.4
50
16.0
12.0
9.6
6.4
4.8
2.4
75
10.7
8.0
6.4
4.3
3.2
Precipitation Rate Formula
Precipitation Rate (mm/hr) =
10 000 x Emitter Flow (lph)
Lateral Spacing (cm) x Emitter Spacing (cm)
Note: this formula applies to evenlty spaced drip irrigation and emitters
Precipitation Rate for a Single Lateral
Precipitation Rate for a Single Drip Line in a contained Landscape (mm/hr)
Emitter Flow (Lph)
Emitter Spacing (cm)
Width of Contained Landscape (m)
50
75
100
125
150
1.2
30
8.0
5.3
4.0
3.2
2.7
1.2
50
4.8
3.2
2.4
1.9
1.6
1.2
75
3.2
2.1
1.6
1.3
1.1
1.5
30
10.0
6.7
5.0
4.0
3.3
1.5
50
6.0
4.0
3.0
2.4
2.0
1.5
75
4.0
2.7
2.0
1.6
1.3
2.4
30
16.0
10.7
8.0
6.4
5.3
2.4
50
9.6
6.4
4.8
3.8
3.2
2.4
75
6.4
4.3
3.2
2.6
2.1
Precipitation Rate Formula
Precipitation Rate (mm/hr) =
10,000 x Emitter Flow (lph)
Width of Contained Landscape (cm) x Emitter Spacing (cm)
Company policy is one of constant improvement and therefore changes in specifications may be made without notice and without incurring liability. Please refer to www.toro.com.au
Toro Australia Pty Ltd, 53 Howards Road, Beverley, South Australia, 5009.
Phone 1300 130 898, fax (08) 8243 2488. A.B.N. 47 001 310 443
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