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Developed Open Space
Street Tree Planting Area
Street Yard
Buffer Yard
Vehicular Use Area (VUA)
VUA Interior
VUA Screen
VUA Detention
Street Wall & Foundation Planting
Tree Protection Area
Secondary Business Elevation
Landscape Screen
 
 
 
 
 
 
 

 

VUA Detention

VUA Detentions are just now being recognized as a landscape design component in community landscape codes. This is perhaps the first storm water management facility finding its way into community codes for the purpose of managing urban on-site non-point pollutants. Since parking lots and associated vehicular use areas such as loading docks, paved display areas, service areas, drive through service areas, and auto storage yards typically collect many of the known pollutants it makes sense for communities to begin to require these facilities. Typically these facilities are designed near parking lots. They are designed with porous surfaces and planted edges. They are landscaped with ornamental plants to filter and infiltrate a percentage of rainfall directly into the ground. The landscape plants and the graded surface area there by capture sediments, solid waste, chemical compounds that might normally wash off of the site finding there way to a fresh water body.

 

Calculations

Planting Area

Design Storm Water Area= Length (of area) X Width (of area)

 

VUA Detention Area= Design Storm Watershed Area X One Twelfth (1/12)

 

Vegetation Requirements= VUA Detention Area/ One Thousand (1000)

 

VUA detentions may be any geometry but shall be sized according to storm water flows from parking lots and vehicular use areas and generally shall be between twelve (12) inches and thirty-six (36) inches in depth.

 

VUA detentions shall be installed adjacent to vehicle use areas with the prime purpose of intercepting and filter surface run off and capturing non-point vehicular related pollutants within a designated landscaped area or planted storm water collection buffers sized to capture the first flush or one (1) inch of storm water originating within the VUA and connected to a public drainage system exposed to public streets or zoning districts of a higher classification. VUA detentions shall be designed , planted, maintained and calculated as illustrated by the LDIT Manual.

 

 

General Design Standards for Rain Gardens

VUA detentions shall be designed and landscape with trees, shrubs, ground covers, and native perennials appropriate to the function of dry infiltration. The landscaped area is also to be designed to meet on-site storm water management requirements. The planting of VUA detentions shall be designed to filter, infiltrate or evaporate the first flush (WQ) including sediments, solid waste, chemical compounds and other surface pollutants emanating on parking lots or driveways and being moved about by rain storms. Grassed surface within these detentions may remain in the tall grass stage if planting with Class B Centipede, St. Augustine or hybrid Bermuda grass. The edge of the storm water detentions may be planted with any combination of Class A, Class B , or Class C, and shrubs for every one thousand (1000) square feet.

 

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