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
Which type of drainage structure is specifically designed to remove sediment and debris from stormwater before it enters the pipe system?
Answer: Nutrient-separating baffle box (NSBB)
An NSBB uses internal baffles to trap sediment, floatables, and debris before stormwater enters the conveyance system.
During inspection of a corrugated metal pipe (CMP), an inspector finds that the pipe invert has lost more than 40% of its wall thickness due to corrosion. What should the inspector recommend?
Answer: Recommend immediate pipe replacement or structural lining
Loss of more than 25–40% of CMP wall thickness is generally the threshold requiring replacement or structural rehabilitation to prevent collapse.
What is the purpose of a flared end section (FES) on a culvert?
Answer: To transition flow smoothly and improve hydraulic efficiency while reducing embankment erosion
A flared end section reduces entrance losses, improves the hydraulic coefficient of discharge, and protects the embankment slope from erosion at inlet and outlet.
When inspecting roadside swales after a storm event, an inspector observes rills and small channels eroded into the swale bottom. What does this indicate?
Answer: Flow velocities are exceeding the erosive velocity of the soil, requiring erosion protection
Rilling in a swale bottom indicates flow velocities exceed the permissible velocity for the soil type, and erosion protection measures are needed.
Which document serves as the primary reference for drainage inspection procedures and condition rating in Florida CTQP Drainage training?
Answer: FDOT Drainage Manual and FDOT Structures Inspection Manual
FDOT's Drainage Manual and Structures Inspection Manual are the primary state-specific references for Florida CTQP drainage inspection procedures.
An inspector observes that a stormwater pond's control structure weir board is missing one of three boards. What is the most likely consequence?
Answer: The pond will drain faster than designed, reducing water quality treatment time
A missing weir board lowers the effective weir crest, causing the pond to drain sooner and reducing hydraulic retention time needed for pollutant settling.
What condition exists when a culvert operates with the outlet submerged but the pipe is not flowing full under pressure throughout its length?
Answer: Outlet control with partly full (open-channel) pipe flow
When tailwater submerges the outlet but the pipe does not run under full pressure, the culvert operates under outlet control with open-channel (partly full) flow.