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For every 3 feet of horizontal run, there is a vertical change of 1 foot of assent or desent. i.e.: if the bank is falling away from the top of the slope towards the toe of the slope ata rate of 1 foot drop for every 3 feet horizontal, or away from the top, the ratio of desent is 3:1 (3 feet out for every 1 foot down).

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Q: What does a bank slope ratio of 3 to 1 mean?
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