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IRRIGATION SYSTEM DESIGN PARAMETERS
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TABLE 2 - Travelling Irrigation Gun Settings
3" Travelers w/Nelson 150 Big Gun Sprinklers
Make, Model and Type of Equipment:
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TABLE 3 - Solid Set Irrigation Gun Settings
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TABLE 4 - Irrigation System Specifications
I Solid Set
Irrigation
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Hose Length (feet)
Type of Speed Compensation
Pump Type (PTO, Engine, Electric)
Pump Power Requirement (hp)
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TABLE 5 - Thrust Block Specifications
LOCATION
90 degree bend
Dead End
Tee
Gate Valve
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IRRIGATION SYSTEM DESIGNER
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Required Documentation
The following details of design and materials must accompany all irrigation design
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Narrative of Irrigation System Operation
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Sheet7
CALCULATIONS
Sprinkler Specifications
Sprinkler Type: Nelson 150
Nozzle Size: 1.18 inches
Sprinkler Pressure: 50 psi
Flowrate(GPM): 205 gpm
Wetted Diameter: 300 feet
Lane Spacings
Desired Spacing (%):
Design Spacing(feet):
Actual Spacing (feet):
Actual Spacing (%):
Application Rate
Application Rate =(96.3xFlowrate)/(3.1415x(.9xradius)squared)
Design App. Rate = 0.34 in/hr
300 degree arc =
220 degree arc =
180 degree arc =
Traveller Speed
70 %
210 *PVC irrigation pipe normally comes in 20' pieces,
so round to the nearest multiple of 20.
240 feet
80 %
0.41 in/hr
0.56 in/hr
0.69 in/hr
330 degree arc = 0.38 in/hr
Travel speed = 1.605 x Flowrate / Desired application amount x Lane Spacing
Desired app. (in.) =
300 degree arc =
220 degree arc =
180 degree arc =
Mainline Velocity
0.5 inches
3.29 ft/min
4.39 ft/min
5.48 ft/min
360 degree arc = 2.74 ft/min
330 degree arc = 2.99 ft/min
Velocity = .408 x Flowrate / pipe diameter squared feetsec.**
**For buried pipelines, velocity should be below 5 feet per second
Pipe size: 6 inches
Velocity= 2.32 fUsec.
Page 1
Sheet7
CALCULATIONS
Sprinkler Specifications
Sprinkler Type: Nelson 150
Nozzle Size: 1.18 inches
Sprinkler Pressure: 50 psi
Flowrate(GPM): 205 gpm
Wetted Diameter: 300 feet
Lane Spacings
Desired Spacing (%):
Design Spacing(feet):
Actual Spacing (feet):
Actual Spacing (%):
Application Rate
Application Rate =(96.3xFlowrate)/(3.1415x(.9xradius)squared)
Design App. Rate = 0.34 in/hr
300 degree arc =
220 degree arc =
180 degree arc =
Traveller Speed
70
210 *PVC irrigation pipe normally comes in 20' pieces,
so round to the nearest multiple of 20.
200 feet
67 %
0.41 in/hr
0.56 in/hr
0.69 in/hr
330 degree arc = 0.38 in/hr
Travel speed = 1.605 x Flowrate / Desired application amount x Lane Spacing
Desired app. (in.) =
300 degree arc =
220 degree arc =
180 degree arc =
Mainline Velocity
0.5 inches
3.95 ft/min
5.26 fUmin
6.58 fUmin
360 degree arc =
330 degree arc =
Velocity = .408 x Flowrate / pipe diameter squared feet/sec.**
**For buried pipelines, velocity should be below 5 feet per second
Pipe size: 6 inches
Velocity= 2.32 fUsec.
3.29 ft/min
3.59 ft/min
Page 1
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Acreage Calculations 10/05/2020
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