A storm pipe run of 216 ft must fall at 1/8 in. per ft. What total fall is required?
Correct Answer
A) 27.0 in.
Total fall is 216 ft x 1/8 in. per ft = 27.0 in.
Why This Is the Correct Answer
Total fall is 216 ft x 1/8 in. per ft = 27.0 in.
Why the Other Options Are Wrong
Option B: 24 in.
storm pipe fall, choice a: 24 in. implies about 11.11 percent fall over 216 ft; the stated slope is the one used in.
Option C: 29 in. total fall
storm pipe fall, choice b: 29 in. is wrong because 29 in. implies about 13.43 percent fall over 216 ft; the stated slope is the one used in.
Option D: 54 in. total fall
storm pipe fall, choice d: 54 in. implies about 25 percent fall over 216 ft; the stated slope is the one used in.
Memory Technique
Picture a stormwater map labeled storm pipe fall: finish every operation before accepting 27.0 in.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use by topic index - gravity drainage slope / pipe fall to confirm that Total fall is 216 ft x 1/8 in.
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