A gravity pipe must slope 1.0% for 180 ft. What total fall is required?
Correct Answer
A) 1.8 ft
Fall is 180 ft x 0.010 = 1.8 ft.
Why This Is the Correct Answer
Fall is 180 ft x 0.010 = 1.8 ft.
Why the Other Options Are Wrong
Option B: 0.18 ft
pipe slope fall, choice a: 0.18 ft implies about 0.1 percent fall over 180 ft; the stated slope is the one used in Fall is 180 ft x 0.010 = 1.8 ft.
Option C: 18 ft
pipe slope fall, choice c: 18 ft is wrong because 18 ft implies about 10 percent fall over 180 ft; the stated slope is the one used in Fall is 180 ft x 0.010 = 1.8 ft.
Option D: 180 ft
pipe slope fall, choice d: 180 ft implies about 100 percent fall over 180 ft; the stated slope is the one used in Fall is 180 ft x 0.010 = 1.8 ft.
Memory Technique
Keep a badge beside pipe slope fall: if one number is skipped, the option drifts away from 1.8 ft.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use by topic index - gravity drainage slope / pipe fall to confirm that Fall is 180 ft x 0.010 = 1.8 ft.
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