136.1 Top Of Bank

 

The natural transition line or upper natural topographical break at the top of a valley, or at the top of a channel that contains a watercourse, between a slope where the grade exceeds 15.0 per cent and the adjacent upper level area where the grade is less than 15.0 per cent, and where area that is less than 15.0 per cent in slope is at least 15.0 metres wide.