Rolling dips should be installed on road grades of up to 15%.
Consult the 2010 Texas Forestry BMP Handbook for further information on constructing either type of structure.
One main disadvantage to these types of structures is that they are more costly and time consuming to build. If the soil type and topography warrant, you may need to use rock to protect the outfall area or to prevent rutting the road surface.
Neither water control structure should be used for cross draining springs, seeps, or intermittent or perennial stream. They are intended only to drain road surface runoff.