Central Massachusetts Regional Stormwater Coalition Part 4
Stormwater BMP Toolbox September 26, 2013 Community Innovation
Challenge Grant 2013
Slide 2
Central Massachusetts Regional Stormwater Coalition Objective
of the Task Encourage small property owners and developers to use
on-site treatment and management of stormwater. Format existing
materials to be understood by the general public. Create Mini-Spec
sheets for property owner to hand to developer or contractor.
Encourage good construction and pollution prevention practices. Not
reinvent the wheel
Slide 3
Central Massachusetts Regional Stormwater Coalition Small-Site
Stormwater Management Improve Water Quality a.Increase
groundwater/aquifer recharge b.Improve surface water quality
c.Reuse stormwater for watering d.Protect private property e.Reduce
adverse impacts to stream channels f.Show the importance of BMP
maintenance g.Reduce erosion and sedimentation during construction
Hiwassee River Watershed Coalition, Inc.
Slide 4
Central Massachusetts Regional Stormwater Coalition Site
Characteristics 1.Identify Site Characteristics a.Building
Locations b.Impervious and Pervious Areas c.Types of Impervious
Area d.Slopes and Contours e.Wetlands or Drinking Water
Sources
Slide 5
Central Massachusetts Regional Stormwater Coalition Pervious
and Impervious Area 1.Determine Pervious and Impervious Areas
a.Design treatment and infiltration based on the surface area of
all existing or proposed impervious area. 2.Minimize Impervious
Area a.Pervious areas are more cost effective to maintain and
construct.
Slide 6
Central Massachusetts Regional Stormwater Coalition Soil
Permeability Soil Permeability: ability of soil to allow water to
pass through it. For Infiltration BMPs a.Soils with high
permeability are desirable. b.Design requires calculating the
correct area and volume of water to be stored and/or infiltrated to
prevent BMP surcharging. c.Maintenance is important to maintain
soil permeability and overall effectiveness.
Slide 7
Central Massachusetts Regional Stormwater Coalition Total
Suspended Solids (TSS) Removal Rates 1.BMPs minimize volume of TSS
entering surface waters and/or aquifers 2.MassDEP Stormwater
Handbook is not required for single family homes or small
development, but guides effective BMP design. 1.Requires 80% TSS
removal. 2.Requires 44% TSS removal prior to infiltration, if BMP
is located within a critical area.
Slide 8
Central Massachusetts Regional Stormwater Coalition Site
Limitations and Setbacks Massachusetts Stormwater Handbook Natural
site limitations include: steep slopes, wetlands, surface waters,
and seasonal high groundwater.
Slide 9
Central Massachusetts Regional Stormwater Coalition Minimize
BMP Space Requirements 1.Minimize stormwater runoff by maximizing
onsite treatment, storage, and infiltration. 2.Retain stormwater at
small sites with the following design principles: a.Reduce building
footprints; b.Cluster buildings; c.Slope impervious surfaces toward
stormwater BMPs; d.Install vegetated filter strips or rain gardens
at the end of driveways and parking lots; e.Utilize rain barrels or
cisterns.
Slide 10
Central Massachusetts Regional Stormwater Coalition
Mini-Specs
Slide 11
Central Massachusetts Regional Stormwater Coalition For Each
BMP Description Benefits Applicability Limitations Level of
Treatment Provided Costs Common Applications Maintenance Schedule
Resources
Slide 12
Central Massachusetts Regional Stormwater Coalition BMPs
Included in the Toolbox Pretreatment BMPs 1.Street Sweeping 2.Deep
Sump Catch Basins Treatment BMPs 1.Bioretention Areas (Rain
gardens) 2.Subsurface infiltration systems (Cultech, Stormtech)
3.Tree box filters Lance Landscape
Slide 13
Central Massachusetts Regional Stormwater Coalition BMPs
Included in the Toolbox (cont) Infiltration BMPs 1.Porous pavement
2.Dry wells 3.Infiltration Trenches Conveyance BMPs 1.Drainage
Channels 2.Water quality swales/grassed channels
Slide 14
Central Massachusetts Regional Stormwater Coalition BMP
Accessories 1.Level Spreaders 2.Catch Basin Inserts 3.Rip rap
4.Rain barrels 5.Cisterns 6.Erosion control measures Mulching Hay
bales Silt fencing Biodegradable mesh Photo: University of Southern
Alabama Photo: BMP Supplies
Slide 15
Central Massachusetts Regional Stormwater Coalition Erosion
Prevention BMPs: Mulching Increase stormwater infiltration, reduce
runoff velocity, and provide more suitable habitat for seedling
germination. MaterialApprox. CostRemarks Wood Chips $22/Cu. Yd.
Resistant to wind blowing. Decomposes slowly. Can absorb nutrients
from soil. Bark Mulch $35/Cu. Yd. Resistant to wind blowing.
Decomposes slowly. Compost$20/Cu. Yd. Most prone to erosion out of
natural stabilization materials. Not recommended for steep slopes.
Excellent moisture conserver. Resistant to wind blowing.
Hay/Straw$4/bale Use straw where mulch is maintained for more than
three months. Subject to wind blowing unless anchored. Best
material for germinating seeds. Peat Moss $50/Cu. Yd. Subject to
wind blowing unless kept wet.
Slide 16
Central Massachusetts Regional Stormwater Coalition
Construction Management Practices Construction activities can
contribute sediment to surface water bodies, provide the
opportunity for spills from equipment to occur and for nuisance
dust to be generated. Best management practices can reduce the
potential for these issues to occur. NPDES Construction General
Permit vs. Local Construction Requirements
Slide 17
Central Massachusetts Regional Stormwater Coalition
Construction Management Practices Small Site SWPPP Preventing
sediment transport is the primary goal of a SWPPP. Development: *
Owner, Designer Contractor Considerations: * Existing Site
Conditions * Limit and Stabilize Site Disturbances * Keep Runoff
Velocities Low * Protect Disturbed Areas * Retain Sediment Onsite *
Include an Operation, Inspection and Maintenance Plan. Complete a
site walk with all parties prior to construction. GatorGuard
Environmental Products
Slide 18
Central Massachusetts Regional Stormwater Coalition Site
Staging 1.Minimize Disturbance 2.Avoid Steep Slopes and Excessive
Grading 3.Stockpile Stabilization 4.Using Vegetation for
Stabilization 5.Dust Prevention
Slide 19
Central Massachusetts Regional Stormwater Coalition Equipment
and Waste Management 1.Cleaning Vehicles Leaving the Site 2.Fueling
Operations 3.Construction Waste Management Photo: Hong Kong
EPD
Slide 20
Central Massachusetts Regional Stormwater Coalition Roles of
Professionals in a Residential Project
Slide 21
Central Massachusetts Regional Stormwater Coalition Integrating
LID into Site Design