| Infiltration: |
¾ to 1.5-inch diameter washed clean drain rock
|
| Cobble: |
6 to 8-inch diameter |
| Stone - Medium: |
9 to 12-inch diameter |
| Stone - Large: |
12-inch diameter depending on purpose/location |
| Riprap: |
9 to 24-inch diameter depending on purpose/location |
| Parking Barriers: |
Boulders must be greater than 3 feet in diameter and set into the ground one-third to one-half of its diameter below the finished grade.
Post bollards must be 2 feet in height with 12" below ground. |
| Slopes/Basin: |
Angular rock only |
| Pea Gravel: |
Not permitted under dripline roof edges, infiltration BMPs, or sloped areas. |
| Lava Rock: |
Not permitted |