 Holds water in the landscape so it infiltrates (drain) into the ground

Location  Intercept water draining toward storm sewer  Depressed area

Location  >10’ from the home  >25’ feet from a septic tank leach field

Materials  50-60% sand  20-30% top soil  20-30% compost

Native plants  Both wet- and drought-tolerant

Mulch  Dense, won’t float  3 to 4 inches of hardwood mulch  Pine bark mulch too lightweight

Size  Approximately 20% of impermeable area  Including rooftops, driveways, and other impervious surfaces),

Water Table  No shallower than 18” from the surface  Ensure proper drainage

Excavation  6-8 inches deep  8-10 ft. wide in the direction of stormwater flow

Perimeter  To prevent overflow from eroding the edge  stones  Berm can contain water until infiltration

Soil  Sandy loam to loamy sand  Permeability rates of 1 to 6 inches per hour

Infiltration  Dig a hole the size of a coffee can  Fill with water.  How many inches does it drop in an hour?  Ideally, 1 to 6 inches.

Drainage  Subsurface drain tile to drain large volumes of water  Perforated tile (4”) installed 3.5 to 5 feet below the surface  Enveloped in washed gravel and geotextile fabric

 Storm drain to river

 Berm to divert water from basin

 Stalite PermaTill bioretention media is delivered

 PermaTill media is spread to six inch depth

 Other rain garden projects 