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Rain Garden
Rain Grove
Circular Depression
Planted Storm Water Buffer
Infiltration Trench
Sand Filter
Bio-swale
Porous Paving
Above Ground Cistern
Underground Storm Water Chamber
Preserved Wetland
Tree Protection Area
Habitat Protection Area
Riparian Buffer
Constructed Wetland
Parking Lot Detention
Grassed Swale
Vegetated Ditch
 
 
 

 

Rain Grove

Rain Groves are miniature forests that are very practical storm water management devises that provide multiple services. Rain groves add beauty and shade to any building site. They provide habitat for birds and other urban creatures that live in close proximity to mankind. But more importantly rain groves can be used to absorb run off. Since trees need water, building a rain grove to intercept run off will provide suitable habitat to grow a variety of wetland trees and shrubs. These plants will soak up hundreds of gallons of water a day while also removing waterborne pollutants.

 

Building a rain grove is simple. It just takes a six to twelve inch depression seventy to eight feet wide within an open lawn. This depressed area is planted with lawn grass that tolerates water and an assortment of large, medium and small trees as well as large shrubs that can be grouped within a heavy mulched  bed. As the trees grow and mature they form a perfect grove. A tree grove can be a wonderful storm water management facility for any home or commercial development.

 

Calculations

Watershed Area

The one (1) inch design storm watershed area includes the surrounding area as well as the contours 91 and above to the street. 

Square Feet x One Twelfth (1/12) Foot = Cubic Feet

10230 Sq Ft x 1/12 Foot = 852.5 Cubic Ft 

Cubic Feet ÷ Twenty-seven (27) = Cubic Yards

852.5 Cubic Ft ÷ 27 = 31.5 Cubic Yards 

Cubic Yards x Two Hundred Two (202) = Gallons

31.5 Cubic Yards x 202 = 6378 Gallons

Watershed Area = 6378 Gallons in a 1” Design Storm

Rain Grove (BMP) Capacity

Square Feet x One (1) Foot = Cubic Feet

511.5 Sq Ft x 1 FT = 511.5 Cubic Feet 

Cubic Feet ÷ Twenty-seven (27) = Cubic Yards

511.5 Cubic Ft ÷ 27 = 19 Cubic Yards

Cubic Yards x Two Hundred Two (202) = Gallons

19 Cubic Yards x 202 = 3826 Gallons

Rain Grove Capacity = 3826 Gallons

BMP Capacity ÷ Watershed Area = BMP Percentage

3826 ÷ 6378 = 60% BMP Capacity for 1” Design Storm

1” BMP storm capacity Gal ÷ 1” storm total property Gal =

3826 ÷ 40736 =  9% BMP Management Factor

 

 

General Design Standards for Rain Groves

Rain groves shall be a minimum size of a forty (40) foot radius planted with a combination of facultative or wetland trees consisting of Class A or Class B trees and natural understory native plants or shade loving ornamental ground covers.

The micro-detention shall have inflow and overflow capability. The purpose of the micro-detention is to soak up common overland flow at a proscribed capture rate (CR) determined by the Director of Landscape & Forestry.

 

Click Here for more Technical Standards

 

 

Buck Abbey

309 Design Building
Baton Rouge, LA 70803
(O) 225.578.1475
(F) 225.578.1445
LSUGreenLaws@aol.com