Drainage and Stormwater Management Flashcards
6 cards from real FDOT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Drainage and Stormwater Management flashcards as text
What is the minimum required freeboard above the 100-year flood elevation for FDOT roadway design?
Answer: 1 foot
FDOT requires a minimum of 1 foot of freeboard above the 100-year flood elevation for roadway design to provide a safety margin.
What Manning's roughness coefficient (n) does FDOT typically use for smooth concrete pipe in hydraulic calculations?
Answer: 0.012
FDOT uses a Manning's n of 0.012 for smooth concrete pipe in hydraulic calculations, reflecting the pipe's relatively smooth interior surface.
According to FDOT specifications, what is the maximum joint gap allowed between sections of reinforced concrete pipe during installation?
Answer: 1 inch
FDOT allows a maximum joint gap of 1 inch between reinforced concrete pipe sections to ensure adequate soil support and prevent joint failure.
What is the primary purpose of a detention pond (versus a retention pond) in FDOT stormwater design?
Answer: Temporarily store excess runoff and release it at a controlled rate
Detention ponds temporarily hold excess stormwater and release it slowly through a control structure, reducing peak discharge rates to receiving waters.
What FDOT standard index drawing covers inlet types and dimensions for stormwater collection?
Answer: Index 425
FDOT Index 425 covers drainage structure inlet types, dimensions, and construction details used in stormwater collection systems.
In FDOT drainage design, what does the rational formula variable 'C' represent?
Answer: Runoff coefficient based on land use
In the rational formula Q = CiA, the variable C is the dimensionless runoff coefficient that represents the fraction of rainfall that becomes runoff based on land use and soil type.