CLA Grading & Drainage Flashcards
6 cards from real CLA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CLA Grading & Drainage flashcards as text
What ADA requirement applies to cross-slopes of accessible pedestrian routes?
Answer: Maximum 1:50 (2%)
The ADA Standards require cross-slopes on accessible routes to be no steeper than 1:50 (2%) to prevent wheelchair tipping.
Which instrument is traditionally used in the field to measure elevations and set grades during landscape construction?
Answer: Automatic level (builder's level)
An automatic level (builder's level) with a rod is the classic instrument for measuring elevation differences and setting finish grade.
A site has an impervious cover of 80%. Under the Rational Method, what coefficient (C) value would be most appropriate for runoff calculation?
Answer: 0.75
A C value of approximately 0.70–0.85 is typical for heavily paved commercial areas with 80% impervious cover.
What grading element is used along the back of a curb to prevent water from flowing onto adjacent property?
Answer: Interceptor swale
An interceptor swale (or diversion swale) catches upslope runoff and redirects it before it reaches adjacent properties or structures.
Which contour interval would be most appropriate for detailed grading design on a relatively flat site (0–5% slopes)?
Answer: 1 foot
A 1-foot contour interval provides the detail needed to show subtle grade changes on flat terrain critical for drainage design.
What is 'daylight' in the context of a grading cross-section?
Answer: The point where a slope meets existing grade
The 'daylight' line or point is where a graded slope intercepts and meets the existing natural grade.