Florida Irrigation Contractor Exam Study Guide & Test
Bank (200 Questions & Answers with
Rationales)/Florida Irrigation Specialty Contractor
Exam Prep:Questions + Detailed Explanations | pdf
1. Pre-Construction, Site Analysis & Soil Hydraulics
1. According to Florida Statute § 373.62, what component is legally required on all
newly installed or retrofitted automatic irrigation systems in Florida?
o A) An inline magnetic flow meter
o B) A functional rain shutoff device or soil moisture sensor ✔
o C) A secondary pressure booster pump
o D) A manual bypass globe valve
Rationale: F.S. § 373.62 mandates that any person who purchases or installs
an automatic irrigation system must equip it with a functioning rain sensor
device or soil moisture sensor to prevent irrigation during rainfall events.
2. When determining soil infiltration rates during site analysis, which soil texture
classification exhibits the highest intake rate and lowest water-holding capacity?
o A) Heavy clay
o B) Silty clay loam
, o C) Coarse sand ✔
o D) Fine organic peat
Rationale: Coarse sandy soils, predominant across much of coastal and
central Florida, have large pore spaces yielding high intake/infiltration rates
(1.0 to 5.0+ inches/hour) but very low available water-holding capacity (0.5 to
0.75 inches per foot of depth).
3. What is the phenomenon where fine-textured soils absorb water slower than the
application rate of the irrigation heads, resulting in surface water movement?
o A) Transpiration
o B) Runoff ✔
o C) Deep percolation
o D) Capillary rise
Rationale: Runoff occurs when the precipitation rate of the irrigation system
exceeds the soil's infiltration capacity, leading to water loss and potential
erosion.
4. When utilizing reclaimed water (purple pipe systems) in Florida for landscape
irrigation, which requirement must be met under Florida Administrative Code (F.A.C.)
and Florida Building Code?
o A) Reclaimed water mains must be installed in the same trench as potable
water pipes
o B) Cross-connections between reclaimed water lines and potable water
systems are strictly prohibited, and backflow protection is required at
the potable service entrance ✔
, o C) Reclaimed water can be sprayed directly onto fruit crops intended for
unwashed raw consumption
o D) Reclaimed system valve boxes must be painted bright yellow
Rationale: Florida regulations require strict physical separation and color-
coding (purple) for reclaimed water components to prevent cross-
contamination with public drinking water supplies.
5. In landscape irrigation design, what does "Head-to-Head Coverage" specify?
o A) Sprinkler heads must spray at least 50% of the distance to the adjacent
head
o B) The throw radius of one sprinkler head must reach the exact location
of the adjacent sprinkler head (100% spacing) ✔
o C) Sprinklers must be installed in pairs facing back-to-back
o D) Sprinkler heads must be placed no closer than 20 feet apart regardless of
nozzle size
Rationale: Head-to-head coverage (100% spacing overlap) ensures uniform
water distribution, eliminating dry spots caused by the triangular water
distribution profile of spray and rotor heads.
6. A contractor measures a static water pressure of 65 PSI at the water meter. When
the system operates at a flow rate of 15 GPM, the pressure at the valve manifold
drops to 48 PSI. What does the 17 PSI difference represent?
o A) Static head loss
o B) Friction head loss (Dynamic pressure drop) ✔
o C) Elevation gain pressure
o D) Atmospheric backpressure
, Rationale: Friction loss occurs as water flows through pipes, fittings, meters,
and valves due to viscous resistance along interior pipe walls. Dynamic
pressure = Static pressure minus friction losses.
7. When reading an irrigation plan drawn to a scale of $1\text{ inch} = 20\text{ feet}$, a
main line pipe measures $4.75\text{ inches}$ on the blueprint. What is the actual
field length of the pipe?
o A) 47.5 feet
o B) 95.0 feet ✔
o C) 120.0 feet
o D) 190.0 feet
Rationale: $\text{Actual Distance} = \text{Map Measurement} \times
\text{Scale Ratio} = 4.75\text{ inches} \times 20\text{ ft/inch} = 95\text{ feet}$.
8. What is the maximum recommended water velocity in PVC plastic irrigation
mainlines to prevent destructive water hammer (hydraulic surge)?
o A) 2 feet per second (fps)
o B) 5 feet per second (fps) ✔
o C) 10 feet per second (fps)
o D) 15 feet per second (fps)
Rationale: Industry standard (Irrigation, 6th Ed.) limits maximum flow velocity
in plastic pressure piping to 5 fps ($1.5\text{ m/s}$) to minimize water hammer
stress on pipe joints and valves.
9. According to the Florida Building Code – Plumbing, what type of backflow preventer
is required when chemical injection (fertigation) is connected to an irrigation system
supplied by a potable water main?
Bank (200 Questions & Answers with
Rationales)/Florida Irrigation Specialty Contractor
Exam Prep:Questions + Detailed Explanations | pdf
1. Pre-Construction, Site Analysis & Soil Hydraulics
1. According to Florida Statute § 373.62, what component is legally required on all
newly installed or retrofitted automatic irrigation systems in Florida?
o A) An inline magnetic flow meter
o B) A functional rain shutoff device or soil moisture sensor ✔
o C) A secondary pressure booster pump
o D) A manual bypass globe valve
Rationale: F.S. § 373.62 mandates that any person who purchases or installs
an automatic irrigation system must equip it with a functioning rain sensor
device or soil moisture sensor to prevent irrigation during rainfall events.
2. When determining soil infiltration rates during site analysis, which soil texture
classification exhibits the highest intake rate and lowest water-holding capacity?
o A) Heavy clay
o B) Silty clay loam
, o C) Coarse sand ✔
o D) Fine organic peat
Rationale: Coarse sandy soils, predominant across much of coastal and
central Florida, have large pore spaces yielding high intake/infiltration rates
(1.0 to 5.0+ inches/hour) but very low available water-holding capacity (0.5 to
0.75 inches per foot of depth).
3. What is the phenomenon where fine-textured soils absorb water slower than the
application rate of the irrigation heads, resulting in surface water movement?
o A) Transpiration
o B) Runoff ✔
o C) Deep percolation
o D) Capillary rise
Rationale: Runoff occurs when the precipitation rate of the irrigation system
exceeds the soil's infiltration capacity, leading to water loss and potential
erosion.
4. When utilizing reclaimed water (purple pipe systems) in Florida for landscape
irrigation, which requirement must be met under Florida Administrative Code (F.A.C.)
and Florida Building Code?
o A) Reclaimed water mains must be installed in the same trench as potable
water pipes
o B) Cross-connections between reclaimed water lines and potable water
systems are strictly prohibited, and backflow protection is required at
the potable service entrance ✔
, o C) Reclaimed water can be sprayed directly onto fruit crops intended for
unwashed raw consumption
o D) Reclaimed system valve boxes must be painted bright yellow
Rationale: Florida regulations require strict physical separation and color-
coding (purple) for reclaimed water components to prevent cross-
contamination with public drinking water supplies.
5. In landscape irrigation design, what does "Head-to-Head Coverage" specify?
o A) Sprinkler heads must spray at least 50% of the distance to the adjacent
head
o B) The throw radius of one sprinkler head must reach the exact location
of the adjacent sprinkler head (100% spacing) ✔
o C) Sprinklers must be installed in pairs facing back-to-back
o D) Sprinkler heads must be placed no closer than 20 feet apart regardless of
nozzle size
Rationale: Head-to-head coverage (100% spacing overlap) ensures uniform
water distribution, eliminating dry spots caused by the triangular water
distribution profile of spray and rotor heads.
6. A contractor measures a static water pressure of 65 PSI at the water meter. When
the system operates at a flow rate of 15 GPM, the pressure at the valve manifold
drops to 48 PSI. What does the 17 PSI difference represent?
o A) Static head loss
o B) Friction head loss (Dynamic pressure drop) ✔
o C) Elevation gain pressure
o D) Atmospheric backpressure
, Rationale: Friction loss occurs as water flows through pipes, fittings, meters,
and valves due to viscous resistance along interior pipe walls. Dynamic
pressure = Static pressure minus friction losses.
7. When reading an irrigation plan drawn to a scale of $1\text{ inch} = 20\text{ feet}$, a
main line pipe measures $4.75\text{ inches}$ on the blueprint. What is the actual
field length of the pipe?
o A) 47.5 feet
o B) 95.0 feet ✔
o C) 120.0 feet
o D) 190.0 feet
Rationale: $\text{Actual Distance} = \text{Map Measurement} \times
\text{Scale Ratio} = 4.75\text{ inches} \times 20\text{ ft/inch} = 95\text{ feet}$.
8. What is the maximum recommended water velocity in PVC plastic irrigation
mainlines to prevent destructive water hammer (hydraulic surge)?
o A) 2 feet per second (fps)
o B) 5 feet per second (fps) ✔
o C) 10 feet per second (fps)
o D) 15 feet per second (fps)
Rationale: Industry standard (Irrigation, 6th Ed.) limits maximum flow velocity
in plastic pressure piping to 5 fps ($1.5\text{ m/s}$) to minimize water hammer
stress on pipe joints and valves.
9. According to the Florida Building Code – Plumbing, what type of backflow preventer
is required when chemical injection (fertigation) is connected to an irrigation system
supplied by a potable water main?
