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Grade Reversal versus Rolling Drain Dip

Trail construction and maintenance for CCCMB involve above all else two concepts: Grade Reversals and Rolling Drain Dips (RDD's). All new trails which CCCMB constructs are based on Grade Reversals. Grade Reversals minimize erosion by draining water off the trail before it can gain volume and speed. Grade Reversals must be incorporated into a trail at the design and layout stage. Unfortunately the vast majority of work peformed by CCCMB volunteers over the last 20 years has been focused on maintenance and therefore on Rolling Drain Dips. RDD's are added to an existing trail as a stop-gap measure to drain water off the trail in order to minimize erosion.



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