Counter slope

an overhanging slope; as, a wall with a counter slope.
- Tooke.

See also: Counter

References in periodicals archive ?
Clearly, an excessive counter slope of the gutter makes it difficult for a person in a wheelchair to maintain the momentum needed to move across the slope of the gutter and onto the running slope of the curb ramp.
Counter slopes of adjoining gutters and road surfaces immediately adjacent to the curb ramp not be steeper than 1:20