Why are gravel roads and gravel parking lots considered to be impervious? Aren they rough enough to slow down runoff so it will soak into the soil?
Typical gravel materials (including “Chapel Hill gravel”) used for roads and parking lots are engineered and compacted to withstand heavy loads. These compacted gravel materials form a seal through which water will not readily infiltrate. Some landscaping or stormwater management applications involve un-compacted, washed stone that would not be considered impervious. This is a uniform grade aggregate that has been pre-washed and is of sufficient depth to promote infiltration into the soil.
Related Questions
- Why are gravel roads and gravel parking lots considered to be impervious? Aren they rough enough to slow down runoff so it will soak into the soil?
- Is gravel for use in parking lots, driveways, or construction sites subject to approval by the Sand Ordinance?
- Can Hot Mix Asphalt be used for other things besides roads, parking lots and driveways?
