In the casework package file, a drainage swale must drop 2.2 percent over 55 feet. What fall is required?
Correct Answer
A) 1.21 feet.
Two and two-tenths percent of 55 feet is 1.21 feet of fall.
Why This Is the Correct Answer
Two and two-tenths percent of 55 feet is 1.21 feet of fall.
Why the Other Options Are Wrong
Option B: 0.99 feet total.
0.99 feet total. is below the supported result for earthwork grading calculation; it likely omits allowance, conversion, coverage, or final round-up.
Option C: 1.32 feet total.
1.32 feet total. is above the supported result for earthwork grading calculation; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Option D: 2.20 feet total.
2.20 feet total. is above the supported result for earthwork grading calculation; it likely double-counts allowance, uses the wrong unit, or rounds too early.
Memory Technique
Earthwork Grading cart for Checking Rough: two-tenths first, percent second, whole the controlling choice last.
Reference Hint
Study anchor (closed-book): memorize Earthwork grading calculation from California Building Code, California Code of Regulations Title 24. / Title 24 California Building Code site drainage and grading concepts; know the rule or calculation trigger without relying on exam-room lookup.
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