19. Every person constructing or improving a road on land whose slope is greater than 9%, where the foot of the slope is less than 60 m from a watercourse or lake, shall divert runoff from ditches at least every 65 m towards a vegetation area. Where runoff has to be diverted from one side of the road to the other, a culvert shall be installed measuring at least 30 cm in diameter or the equivalent in terms of cross-sectional flow area.
At that same time, the slope of the road’s embankment shall be reduced to a ratio of at least 1.5 (H): 1(V), and that embankment shall be stabilized using the usual techniques, such as those referred to in section 25.
The second paragraph of this section does not apply to anyone who stabilizes the embankment referred to in that paragraph with a geotextile membrane and riprap.