Center pivot design summary
Acres, TDH, generator and pump HP, and annual energy cost from Pivot Design 1.52.
Yellow fields are inputs — everything else calculates live, same as the original workbook.
Pulls length and friction from Pivot pressure, current from Pivot electric, and rotation from Pivot timer.
Pivot length, ft
1,284.0
End gun radius, ft
100.0
Flow, GPM
800
Degrees
180
Irrigated acres
69.07
GPM / acre
11.58
Inches / day
0.614
System current, A
5.34
Voltage drop, V
6.33
Last tower, V
473.67
Pump TDH
Span friction, psi
8.98
Mainline friction, psi
3.20
Pressure at swivel, psi
28.31
Lower riser, psi
33.51
Pump discharge, psi
36.71
Pump TDH, ft
84.80
Pump TDH, psi
36.71
Brake HP
22.84
Energy cost
Hours / year
552
% timer for avg. app.
20.8
Generator HP @ 100%
5.95
App. generator HP
1.71
Total HP
24.55
$ / hp-hr
0.1200
Annual operating cost
$1,876