PEVT
Civil/Environmental
- Mar 28, 2008
- 18
I am designing an access road and stormwater system for a small residential development. The access road goes up at an 8% slope and I would like to make an effort to minimize the accumulation of stormwater to the cut side ditch and also encourage the sheet flow to an adjacent gently sloped grass area. I would like to know if any of you have any experience with outsloping of the road cross section. I have found an abundance of literature regarding this type of cross slope grading for rural and forest gravel roads, but not much for very low volume paved roads. Using an outsloping profile would allow me to substantially reduce the ditch runoff, compared to that of a normally crowned road, and thus reduce culvert sizes and spacing. For this particular project the permitting authority is requiring a curb on the sidewalk side, but I can see a real benefit for future projects if a curb is not present. I have attached a basic sketch, just for comments. Thank You.