Annual Nonpoint Source Conference April 29, Presented by. David C. Nyman, P.E. Comprehensive Environmental Inc.
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1 Annual Nonpoint Source Conference April 29, 2014 Presented by David C. Nyman, P.E. Comprehensive Environmental Inc.
2 Application of Low Impact Development/ Integrated Site Design to Roadways: Goal of the design approach is to: First Significantly minimize or reduce runoff/pollutants Then treat the remaining runoff.
3 Integrated Site Design for roadways, involves Minimizing effective impervious cover (EIC): Directly reducing/minimizing pavement Maximizing infiltration Maximizing vegetative uptake Managing pollutants close to their source
4 Roadways consist of Paved surfaces Graded side slopes Drainage conveyance systems Managed rights-of-way Develop a design approach to integrate runoff reduction and pollutant attenuation functions into these features.
5 Other Option: Pervious pavement
6
7
8 Consider roadway elements as potential BMPs: Pavement stormwater practices Embankment stormwater practices Conveyance stormwater practices Roadway landscape stormwater practices
9 Raleighnc.gov deeproot.com co.jefferson.wa.us
10 Source: Maine DOT
11 Maine Mall Road, South Portland, ME ~16750 AADT within Project Limits Maine Mall Parking Lot 1/17/2013 Maine Mall Road Construction 7/27/2009 Maine Mall Road Same Day Source: Maine DOT
12 Conventional Pavement Open Graded Friction Course Source: Barrett, M. and C. Shaw Stormwater Quality Benefits of a Porous Asphalt Overlay.
13 OGFC Pollutant Reduction Relative to Conventional Pavements Study Pollutant (Relative % Reduction) TSS Total P Total Cu Total Pb Total Zn Berbee, et.al., Pagotto, et.al., Barrett, et.al., Barrett & Shaw, Barrett, et.al., Stannard, et.al., Eck, et.al., >90 - > Eck, et.al., 2011 also shows relative reduction does not deteriorate over time.
14 2/3 loamy sand and 1/3 compost Adapted from Washington Department of Transportation
15 CAVS Pollutant Removal Study Pollutant TSS Total P Total Cu Total Zn WSDOT, 2005 (% Removal, conc.) Herrara, 2007 (% Removal, conc.) Herrara, 2007 (% Load Reduction)
16 Ecology Mix: crushed stone aggregate perlite dolomite gypsum Adapted from Washington Department of Transportation
17 Media Filter Drain Pollutant Removal Study Pollutant (% Removal) TSS Total P Total N Total Cu Total Pb Total Zn WSDOT, Turbidity Wright Water Eng rs, et.al., 2011 Geosyntec, et.al., 2010 Geosyntec, et. al.,
18 Accessible, maintainable systems based on use of natural materials Linear conveyance systems that provide treatment; examples: Water Quality Swales Linear Bioretention Swales Variations: think outside the box: VTrans Micro-Pool Filter
19 Source: Vermont Agency of Transportation
20 Estimated Micro-Pool Pollutant Removal Source MassDEP, 2008 Data for Sand Filters Pollutant (% Removal) TSS Total P Total N Cu, Pb, Zn, Cd Plus: Channel Protection Enhanced treatment by settling pools, vegetated filter layer
21 Qualifying Impervious Area Sheet Flow Adapted from Maryland Stormwater Design Manual
22 Scale BMPs to fit the design context; example: Micro-Bioretention Cell Adapted from Maryland Stormwater Design Manual
23 Trees as BMPs Urban street trees (individual trees) Wooded landscape (carsmoveus.com) CUFR 2007
24 In Central Massachusetts, a 12-inch Red Maple Intercepts 1353 gallons of water per year; Equals 3.8 inches of runoff reduction over the area of the tree s canopy Significant Runoff Reduction potential National Tree Benefit Calculator
25 In addition to interception/ evaporation, trees reduce runoff by: Uptake and transpiration from the ground Enhancing infiltration into the ground Roots binding soil, preventing erosion and associated accelerated runoff Source: Tree City USA Bulletin No. 55 Arbor Day Foundation
26 Use trees for runoff reduction: Introduction, restoration, or preservation of individual canopy trees Preservation/restoration of forested landscape Incentives for implementation of these measures
27 City of Philadelphia, PA stormwater program: Water Quality Volume reduction for individual trees Existing tree preservation (canopy within 20 feet) New tree installation (canopy within 10 feet) Must comply with specified standards Pennsylvania (State) Stormwater BMP Manual Individual tree credits Forested area credits (within 100 feet Portland, OR Comparable practices to Philadelphia
28
29 urban_watershed_forestry_manual_part1.pdf
30 Tree Canopy Preservation? Pavement Disconnection? Enhanced Conveyance System? Media Filter Drain? Questions?
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