Texas Irrigator License Exam Questions and Correct Answers 2024 Version Scored 100%
C-Factor - CORRECT ANSWER: 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 - CORRECT ANSWER: Graphic view of precipitation to check uniformity.
Higher rates are darker.
Distribution Uniformity (DU) - CORRECT 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.
Dynamic Pressure (Working Pressure) - CORRECT ANSWER: Pressure of water in
motion.
Pressure left wehn all pressure losses are subtracted from static pressure.
Dynamic Water - CORRECT ANSWER: Water in motion
Elevation Gain & Loss - CORRECT ANSWER: Pressure gain or loss of 0.433 psi for each 1' of elevation.
Flow - CORRECT ANSWER: Movement of water in pipes. Measured as gpm (gallons
per minute).
Causes friction loss
Flow Restrictions - CORRECT ANSWER: Physical restrictions in parts of an irrigation system that affect the flow of water causing a pressure loss.
Foot-Head - CORRECT ANSWER: Measure of pressure equivalent to 0.433 psi and
equal to weight of 1' of water on a 1 sq in surface.
FPS - CORRECT ANSWER: Feet per second
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