Page 48 - 7166 - Rain Garden Handbook
P. 48
Build
42 2 Protect the Inflow
and Overflow Edging
Where water enters the rain garden from a swale or Edging will help separate the rain garden from
pipe, and where water exits at the overflow, place other surrounding landscapes and reduce
a pad of rock to slow the water and guard against encroachment of lawn into the rain garden.
erosion. For both the inflow and overflow, use Edging comes in many forms including curvilinear
round rock (cobble or river rock) that is minimum concrete curbing, unit pavers, flagstone, metal,
2 inches in diameter. The rock should be free of and other materials. Cutting a sharp line between
sediment, so order washed rock. If the overflow is the rain garden edge and the lawn with a spade
through a berm, be particularly careful to armor during the growing season will typically prevent
the overflow with extra rock and extend the rock all grass from spreading into the rain garden. You
the way down the slope and a minimum of 4 feet may be able to avoid the need for edging by
beyond the berm to prevent erosion. locating the rain garden away from a lawn area.
Erica Guttman
David Hymel
David Hymel David Hymel
