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2015•Unpublished venueRequires access

Design and Maintenance of Subsurface Gravel Wetlands

Thomas Paul Ballestero, James J. Houle

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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.

About this research paper

What this paper is about

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.

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Available 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.

Key concepts: Impervious surface, Surface runoff, Stormwater, Environmental science, Wetland, Hydrology (agriculture), Subsurface flow, Groundwater

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