Drainage Systems Inspection Flashcards
7 cards from real CTQP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Drainage Systems Inspection flashcards as text
During a drainage inspection, you observe that a catch basin grate is recessed 2 inches below the surrounding pavement. What is the primary concern?
Answer: Potential for ponding water and safety hazard for pedestrians and cyclists
A grate recessed more than acceptable limits creates ponding areas and poses a trip/fall hazard to pedestrians and cyclists.
Which condition in a reinforced concrete pipe (RCP) drainage culvert most urgently requires immediate corrective action?
Answer: Longitudinal cracks exceeding 0.01 inch width with active infiltration
Longitudinal cracks with active water infiltration indicate structural compromise and risk of pipe collapse or embankment erosion.
What does 'hydraulic gradient' refer to in the context of stormwater drainage inspection?
Answer: The slope of the energy grade line representing pressure head plus elevation head
The hydraulic grade line represents the sum of pressure head and elevation head, indicating flow energy conditions in the pipe.
An inspector notes that a mitered end section of a culvert has separated from the barrel by 3 inches. What action is warranted?
Answer: Flag for immediate repair as separation can lead to undermining and embankment failure
Joint separation at a culvert end section allows water to bypass the structure and erode the embankment, requiring prompt repair.
Under FDOT CTQP standards, what minimum longitudinal slope is generally recommended for roadway drainage ditches to prevent sediment deposition?
Answer: 0.3%
A minimum slope of approximately 0.3% is generally needed to maintain self-cleansing velocities and prevent sediment buildup in open ditches.
When inspecting a French drain (subsurface perforated pipe system), which finding indicates the system is failing?
Answer: Geotextile filter fabric is clogged and saturated soil remains near the surface
Clogged geotextile fabric prevents water from entering the perforated pipe, causing the subsurface drainage system to fail and surface saturation to persist.
An inspector measures the flow line elevation at the inlet of a culvert as 95.2 ft and at the outlet as 94.6 ft. The culvert is 60 feet long. What is the culvert slope?
Answer: 1.00%
Slope = (95.2 − 94.6) ÷ 60 ft = 0.6 ÷ 60 = 0.01, which equals 1.00% grade.