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foot drop is caused by nerve damage & can be treated w/splints, & possibly surgery, but is a permanent otherwise.
Since one foot is 12 inches a four percent slope is .04X12 = 0.48 inch drop
Drop per foot doesn't care about length of run, it depends on pipe size. Pipe larger than 2" needs only 1/8" per foot (37.5" fall for 300'), 2" and smaller needs 1/4" per foot (75" fall for 300')
One eighth inch drop per foot of run.
1/4 inch per foot.