TEXAS IRRIGATION TEST 2 FINAL PAPER 2026
FULL SOLUTION QUESTIONS AND ANSWERS
100% CORRECT
◉ max flowrate for 1/2 in pipe (to stay below 5 fps)
Answer: 5 gpm
◉ max flowrate for 3/4 in pipe (to stay below 5 fps)
Answer: 10 gpm
◉ max flowrate for 1 in pipe (to stay below 5 fps)
Answer: 15 gpm
◉ max flowrate 1 1/4 in. pipe (to stay below 5 fps)
Answer: 25 gpm
◉ max flowrate for 1 1/2 in pipe (to stay below 5 fps)
Answer: 35 gpm
◉ Key requirement for RPZ backflow
Answer: minimum of 12" above grade
, ◉ Key requirement for Double Check backflow (DCVA)
Answer: If installed below grade, Test cocks must be plugged with
non-ferrous (non-magnetic) material
◉ Key requirements for PVB and SVB
Answer: Must be 12" above highest head, valve, pipe, fitting, or
fixture
◉ Key requirements for Air Gap
Answer: The recieving pipe must be 1" wider or 2 times bigger than
the discharge pipe
◉ zone flow
Answer: how many gallons go through a zone
◉ Backflow Prevention Assembly
Answer: Any assembly used to prevent backflow into a potable
water system. The type of assembly used is based on the existing or
potential degree of health hazard and backflow condition.
◉ booster pump
Answer: increases operating pressure
FULL SOLUTION QUESTIONS AND ANSWERS
100% CORRECT
◉ max flowrate for 1/2 in pipe (to stay below 5 fps)
Answer: 5 gpm
◉ max flowrate for 3/4 in pipe (to stay below 5 fps)
Answer: 10 gpm
◉ max flowrate for 1 in pipe (to stay below 5 fps)
Answer: 15 gpm
◉ max flowrate 1 1/4 in. pipe (to stay below 5 fps)
Answer: 25 gpm
◉ max flowrate for 1 1/2 in pipe (to stay below 5 fps)
Answer: 35 gpm
◉ Key requirement for RPZ backflow
Answer: minimum of 12" above grade
, ◉ Key requirement for Double Check backflow (DCVA)
Answer: If installed below grade, Test cocks must be plugged with
non-ferrous (non-magnetic) material
◉ Key requirements for PVB and SVB
Answer: Must be 12" above highest head, valve, pipe, fitting, or
fixture
◉ Key requirements for Air Gap
Answer: The recieving pipe must be 1" wider or 2 times bigger than
the discharge pipe
◉ zone flow
Answer: how many gallons go through a zone
◉ Backflow Prevention Assembly
Answer: Any assembly used to prevent backflow into a potable
water system. The type of assembly used is based on the existing or
potential degree of health hazard and backflow condition.
◉ booster pump
Answer: increases operating pressure
