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Texas Irrigator License Exam 2024: Hydraulics
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Texas Irrigator License Exam 2024: Hydraulics
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Texas Irrigator License Exam 2024:Hydraulics
Hydraulic Design Steps - -1. Layout heads
2. Head inventory
3. Group in Zones
--Determine limiting gpm from WM & service line
4. Layout Pipe
--Put valve in middle & closer to side with less gpm to make the critical head
calculations easier.
5. Size pipe
--Start at a dead end.
--Work towards the water source.
--Don't size a pipe unless everything downstream has been sized.
--Make mainlines 1" or larger
6. Check Critical Head
--L. F. D. 100. I. A. (Ladies Fall Down 100x In Abeline)
--Length of pipe, Flow, Diameter of pipe, pressure loss per 100', Item loss,
Accumulated loss
--LFD. Use Design
--100. Uses Reference Charts
--I. Use #s from LFD & 100 for Item loss.
--A. Add losses from I.
--Other Equations. Use DP (Design Pressure) & AHP (Actual Head Pressure) to
determine if the zone works.
7. Schedule
--Determine precipitation rate
-C-Factor - -Rating of the smoothness of the inside of the pipe.
Higher C-factor = smoother
PVC is 150. Copper is 140.
Generally decreases over time meaning the pipe gets rougher and more
friction loss.
-Densogram - -Graphic view of precipitation to check uniformity.
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