Parking Lot Drainage Swale

Stormwater drainage design for parking lots ace group llc course outline parking lots can be seen almost everywhere from shopping centers to office buildings to schools.

Parking lot drainage swale. In several case studies done in portland oregon savings ranged from 4 000 to 5 500 per acre of developed area. One of the three swale types described below are recommended as trailside drainage in place of a simple ditch for linear stormwater controls as needed adjacent to the trail. Deicing salts can damage soil structure by reducing soils organic matter. This course covers the basics of designing an adequate storm drainage system for a parking lot.

Swale drainage in commercial industrial and parking lot settings has great potential in chicago and also has documented cost savings over conventional storm sewer approaches. Properly maintained swales can collect stormwater runoff trap pollutants increase groundwater recharge and slow the flow of runoff thus reducing erosion. The maximum cross slope is 2 percent. Slopes greater than 5 percent may make the construction of special ramps for the disabled necessary.

Section 1 4 2 green parking lot facilities cross section materials used in the various green parking lot facilities shall be in accordance with the green streets specifications appendix k 2 6. The minimum slope for grassy swales and drainage ways is 1 percent to prevent standing water and muddy conditions. Stormwater drainage design is an integral component in the design of parking lots. Parking lot islands curbless in a paved area with no curb pre cast car stops or a ribbon curb can be installed along the pavement perimeter to protect the swale area.

Green parking lot facilities shall be designed per the green street standard drawings appendix k 2 4. A swale is a depression created in the ground that carries water runoff by gravity away from damaging your home or property. Maintenance responsibility is normally that of the owner. Slopes for walkways will not exceed 5 percent unless unavoidable.

Swales collect that rushing water and helps to control that water drainage by directing it to catch basins drain boxes and curb drains. Additions of mulch added organic matter may be required if drainage to swale is from roadway or parking lot. This application of swale should only be attempted where shallow grades allow for sheet flow conditions over level entrance areas.