Technical Data Formulas
Sprinkler Spacing
Square Spacing
Single-Row
Spacing
• No wind –
50% of diameter
• 7 kph (4 mph) wind
– 50% of diameter
Recommended Sprinkler Spacing
in Wind
•
No wind –
55% of diameter
• 7 kph (4 mph) wind
– 50% of diameter
• 13 kph (8 mph) wind
– 45% of diameter
The Toro Company does not
recommend designing for 0 kph
(mph) wind conditions. Design in
consideration of the worst wind
conditions.
Spacing
Square
Triangular Single
Wind
Spacing
Spacing
Row
50%
50%
45%
No Wind
55%
50%
45%
60%
• 13 kph (8 mph) wind
– 45% of diameter
7 kph (4 mph)
13 kph (8 mph)
55%
50%
Toro does not recommend designing for 0 KPH wind conditions.
Design in consideration of the worst wind conditions.
Triangular Spacing
•
•
•
No wind –
60% of diameter
7 kph (4 mph) wind
– 55% of diameter
13 kph (8 mph) wind
– 50% of diameter
Slope Table
Slope %
(Rise/Run)
Slope
Angle
0.0
Flat
0%
Gentle
9%
5.0
Moderate
Steep
14%
8.0
21%
12.0
Formulas
Precipitation Rates
(English)
(Metric)
Equilateral Triangular
Spacing
P.R.=
(in/hr)
(GPM of 360) x 96.25
(Head Spacing) x .866
P.R.=
(mm/hr)
m³/hr of 360 x 1000
m² x ,866
2
P.R.=
(GPM of 360) x 96.25
P.R.=
m³/hr of 360 x 1000
Square/Rectangular Spacing
Area and Flow
(in/hr)
Head Spacing x Row Spacing
(mm/hr)
Head Spacing x Row Spacing
P.R.=
(in/hr)
(Total GPM of Zone) x 96.3
Total Irrigated Square Feet of Zone
P.R.=
(mm/hr)
LPM x 96,3
Total Irrigated m of Zone
2
Average Precipitation Rate (in/hr)
Lowest Precipitation Rate (in/hr)
Average Precipitation Rate (mm/hr)
Lowest Precipitation Rate (mm/hr)
Scheduling Coefficient
Station Run Time
Pipe Velocity
S.C.=
S.C. =
S.R.T. =
(min/wk)
Total Weekly Req’d (inch/wk) x 60 (min/hr)
Precipitation Rate (in/hr)
S.R.T.=
(min/wk)
Total Weekly Req’d (mm/wk) x 60 (min/hr)
Precipitation Rate (mm/hr)
V=
(ft/sec)
0.4085 x Flow (GPM)
V=
(m/sec)
1273 x Flow (liters/sec)
(Inside Pipe Diameter in Millimeters)
2
(Inside Pipe Diameter in Inches)
2
GPM x Ft. of Head
LPM x Meters of Head
3433 x Pump Efficiency
3960
x Pump Efficiency
Horsepower
Slope
H.P. =
S=
H.P. =
S=
(expressed by decimal)
(expressed by decimal)
Rise (Feet)
Run (Feet)
Rise (Meters)
Run (Meters)
88
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