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 is the minimum recommended slope for lawn areas to ensure positive drainage away from structures?
Answer: 2%
A minimum 2% slope is generally recommended for lawn areas to direct stormwater away from buildings.
A spot elevation of 102.50 is shown at the top of a swale and 100.00 at the bottom over a 50-foot run. What is the slope percentage?
Answer: 5%
Slope % = (rise/run) × 100 = (2.50/50) × 100 = 5%.
Which type of inlet is typically used at the low point of a parking lot to collect surface runoff?
Answer: Catch basin
Catch basins are standard at low points in paved areas because they collect surface water and trap sediment below the outlet pipe.
What grading technique uses a series of flat terraces separated by steep risers to manage slopes on hillsides?
Answer: Bench grading
Bench grading creates level planting terraces on steep slopes, reducing erosion and allowing access.
On a grading plan, a dashed contour line typically indicates:
Answer: Proposed grade
Dashed contour lines represent proposed (finished) grade, while solid lines represent existing grade.
What is the primary purpose of a drainage swale in landscape grading?
Answer: Convey surface runoff in a controlled channel
A drainage swale is a shallow, vegetated channel designed to move surface runoff from one area to another while reducing velocity.