01342487

Component

Stormwater management is a vital component on roadway construction and site development projects. Stormwater detention ponds are often utilized to protect neighborhoods against flooding and streams from environmental degradation. Detention systems are located underground where land is expensive or where there are other concerns such as safety or mosquitoes. Pipes, pipe arches and concrete vaults are typically installed in underground systems. Geosynthetic materials are utilized in a new underground stormwater detention system which offers advantages over traditional systems. Essentially, a geotextile or geomembrane liner system is installed within an excavation. Around the perimeter of the excavation, walls are constructed with geosynthetic reinforcement and open graded stone creating a large underground chamber. Inlet and outlet pipes extend through the perimeter liner system and wall face into the chamber. A reinforced concrete roof is installed over the open chamber and supported by the perimeter abutments/walls. Finally, the liner system is installed over the stone surface before the cover soil brings the site to grade. A large open chamber is constructed with reinforced stone having a high porosity that contributes to the storage capacity. This geosynthetic based underground detention system (GDS) has among other attributes the advantage of low cost, well established American Association of State Highway and Transportation Officials (AASHTO) design standards, small footprint and ease of inspection and maintenance.

01329018

11-0384

English

12p

2011

Transportation Research Board 90th Annual Meeting

DVD

Figures; Photos; References (3)

Detention basins; Drainage; Flood protection; Geosynthetics; Geotextiles; Hydraulic structures; Porosity; Underground structures

Storm water management

Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw

Transportation Research Board Annual Meeting 2011 Paper #11-0384

TRIS, TRB

Feb 17 2011 5:25PM