As the long-lead tracker is updated, what minimum slope is commonly used for 4 in. gravity drainage pipe?
Correct Answer
A) 1/8 in. per ft
1/8 in. per ft is the controlling requirement: the distractors are related-looking contract or field terms, but they do not match the cited requirement for review item 56.
Why This Is the Correct Answer
1/8 in. per ft is the controlling requirement
Why the Other Options Are Wrong
Option B: 1/16 in. per ft; without required sediment or excavation control
The trap in B is 1/16 in. per ft; without required sediment or excavation control. That selection is wrong because 1/16 in. per ft; without required sediment or excavation control is a different drainage slope than the pipe size in the item; the accepted slope is 1/8 in.
Option C: 1/4 in. per ft
Choice C gives 1/4 in. per ft. Its specific error: 1/4 in. per ft is a different drainage slope than the pipe size in the item; the accepted slope is 1/8 in. per ft. The accepted answer is 1/8 in. per ft.
Option D: 1/2 in. per ft
Choice D (1/2 in. per ft) is rejected because 1/2 in. per ft is a different drainage slope than the pipe size in the item; the accepted slope is 1/8 in. per ft. The cited answer is 1/8 in. per ft.
Memory Technique
Make larger drain slope a tabbed card: cite the exact condition, then choose 1/8 in. per ft.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use the index entry or section for "Gravity drainage slope for 3-6 in. pipe" to confirm that 1/8 in.
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