Design and maintenance of subsurface gravel wetlands.

Details

• Creators:
  Ballestero, Thomas P. ; Houle, James
• Corporate Creators:
  University of New Hampshire. Dept. of Civil Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Runoff
  • Subsurface drainage
  • Gravel
  • Wetlands
  • Design
  • Maintenance
  • Costs
• Publication/ Report Number:
  FHWA-NH-RD-15680W
• Resource Type:
  Tech Report
• Geographical Coverage:
  New Hampshire
• Corporate Publisher:
  New Hampshire. Dept. of Transportation. Bureau of Materials and Research
• Abstract:
  This report summarizes the University of New Hampshire Stormwater Center (UNHSC) evaluation of ; a review of Subsurface Gravel Wetlands design and specifications used by the New Hampshire ; Department of Transportation (NHDOT or Department). ; Subsurface Gravel Wetlands (SGW) are a stormwater management system that provides nutrient ; reduction by allowing runoff to flow through a buried horizontal layer of gravel which allows anaerobic ; microbial treatment of surface runoff. UNHSC evaluated the Department’s SGW design parameters for ; the application of SGWs on linear projects (i.e., roadways) including: underdrain systems for seasonally-high groundwater (SHGW); forebays; multiple inlets; low-flow conveyance and orifices; and leaching ; chambers (hydraulic inlets). Results of the cost assessment indicates potential construction savings ; greater than $5,000 per contributing impervious acre.
• Format:
  PDF
• Funding:
  15680W, A003(827)
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29114/dot_29114_DS1.pdf
• File Type:
  [PDF - 3.78 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:7c8d701a75dad98edd691bd57f0bf18a2052eaef06df32683816ee5c20563107