Parking Lot Drainage Swale

Slopes greater than 5 percent may make the construction of special ramps for the disabled necessary.

Parking lot drainage swale.

This application of swale should only be attempted where shallow grades allow for sheet flow conditions over level entrance areas. Swales collect that rushing water and helps to control that water drainage by directing it to catch basins drain boxes and curb drains. 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. 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.

Stormwater drainage design is an integral component in the design of parking lots. Properly maintained swales can collect stormwater runoff trap pollutants increase groundwater recharge and slow the flow of runoff thus reducing erosion. Slopes for walkways will not exceed 5 percent unless unavoidable. 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.

Swales are the broad shallow channels along roads driveways and parking lots that are designed to keep water off your road. This course covers the basics of designing an adequate storm drainage system for a parking lot. A swale is a depression created in the ground that carries water runoff by gravity away from damaging your home or property. Deicing salts can damage soil structure by reducing soils organic matter.

The maximum cross slope is 2 percent. 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. 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. In several case studies done in portland oregon savings ranged from 4 000 to 5 500 per acre of developed area.

The minimum slope for grassy swales and drainage ways is 1 percent to prevent standing water and muddy conditions. Maintenance responsibility is normally that of the owner. Swales are used to capture sheet flow from a parking lot or trail surface and in most places where a ditch is traditionally used.