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TEXAS IRRIGATOR LICENSE EXAM LATEST
2024/2025 QUESTIONS AND CORRECT
ANSWERS(100% CORRECT VERIFIED
ANSWERS)ALREADY GRADED A+
Hydraulic Design Steps - .....ANSWER ...✔✔ 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.
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--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 - .....ANSWER ...✔✔ Rating of the
smoothness of the inside of the pipe.
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Higher C-factor = smoother
PVC is 150. Copper is 140.
Generally decreases over time meaning the pipe gets
rougher and more friction loss.
Densogram - .....ANSWER ...✔✔ Graphic view of
precipitation to check uniformity.
Higher rates are darker.
Distribution Uniformity (DU) - .....ANSWER ...✔✔
Uniformity of distribution of water over a given area as
a %.
Found by doing a catch can test.
Closer to 100% is better with 75%-80% excellent, 65%-
75% good and <65% poor.
TEXAS IRRIGATOR LICENSE EXAM LATEST
2024/2025 QUESTIONS AND CORRECT
ANSWERS(100% CORRECT VERIFIED
ANSWERS)ALREADY GRADED A+
Hydraulic Design Steps - .....ANSWER ...✔✔ 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.
,2|Page
--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 - .....ANSWER ...✔✔ Rating of the
smoothness of the inside of the pipe.
, 3|Page
Higher C-factor = smoother
PVC is 150. Copper is 140.
Generally decreases over time meaning the pipe gets
rougher and more friction loss.
Densogram - .....ANSWER ...✔✔ Graphic view of
precipitation to check uniformity.
Higher rates are darker.
Distribution Uniformity (DU) - .....ANSWER ...✔✔
Uniformity of distribution of water over a given area as
a %.
Found by doing a catch can test.
Closer to 100% is better with 75%-80% excellent, 65%-
75% good and <65% poor.
