A storm pipe run of 432 ft must fall at 1/8 in. per ft. What total fall is required?
Correct Answer
A) 54.0 in.
Total fall is 432 ft x 1/8 in. per ft = 54.0 in.
Why This Is the Correct Answer
Total fall is 432 ft x 1/8 in. per ft = 54.0 in.
Why the Other Options Are Wrong
Option B: 48 in.
storm pipe fall - 432 ft, choice a: 48 in. is wrong because 48 in. implies about 11.11 percent fall over 432 ft; the stated slope is the one used in.
Option C: 59 in. total fall
storm pipe fall - 432 ft, choice b: 59 in. implies about 13.66 percent fall over 432 ft; the stated slope is the one used in.
Option D: 108 in. total fall
storm pipe fall - 432 ft, choice d: 108 in. is wrong because 108 in. implies about 25 percent fall over 432 ft; the stated slope is the one used in.
Memory Technique
Say the storm pipe fall - 432 ft rule aloud as a chain; the chain ends at 54.0 in., not an intermediate stop.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use by topic index - gravity drainage slope / pipe fall to confirm that Total fall is 432 ft x 1/8 in.
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