Jersey Water Works Green Infrastructure Training at NJ Society of Municipal Engineers 9/14/16...

Jersey Water Works Green Infrastructure Training New Jersey Society of Municipal Engineers

September 14, 2016

Jennifer Gonzalez, City of HobokenGreen Infrastructure Subcommittee Co-Chair

Panel

• Jeremiah Bergstrom, Rutgers University

• Russ Dudley, Tetra Tech• Rodman Ritchie, AKRF• Jennifer Gonzalez, City of

Hoboken• Kandyce Perry, New Jersey Future• Louise Wilson, New Jersey Future

3:30 PM Adjourn

AgendaPart 11:00 PM Welcome1:10 PM What is green infrastructure and why does it matter?1:40 PM Green vs. Grey: Case Study Discussion2:35 PM Green Infrastructure Survey

Part 22:55 PM The Path Forward: Tools and Options for Towns3:10 PM Lessons from Hoboken3:25 PM Raffle

2:45 PM Break

Introducing

Shared Goals

Collaborative Structure

Best Practices

Green Infrastruc

ture

Municipal Outreach Finance

Community

Engagement

Committees

CSO Network

GI Committee Purpose

The Green Infrastructure subcommittee works to promote

and advance construction of green infrastructure projects in CSO

communities and across the state.

GI Committee Goals & Subgoals

Work Plan Action Items VolunteersAction 1: Sustainable Jersey Actions

Chris Obropta, Jen Gonzalez, Maureen Krudner, Jennifer Duckworth, Maria Watt

Action 2: Green Infrastructure in Parks

Dan Van Abs, Chris Sturm

Action 3: Green Infrastructure Monitoring Database

Nick Tufaro, Heather Fenyck, Maria Watt

Action 4: Green Streets Rob Pirani, Jen Gonzalez, Jennifer Duckworth, Maureen Krudner, David Antonio

Action 5: Green Infrastructure in Construction/Development

Kandyce Perry, Louise Wilson

Action 6: Citizen’s Handbook for Green Infrastructure

Ashwani Vasishth , Tim Van Epp

Why are we here?

Become a member today!www.jerseywaterworks.org

Sign up for the Jersey Water Works Newsletter!

Part II:

Part I

The What, Where, Why and How of Green Infrastructure

Introduction to Green Infrastructure

www.water.rutgers.edu

Jeremiah Bergstrom, LLA, [email protected]

Christopher C. Obropta, Ph.D., [email protected]

September 14, 2016

http://www.water.rutgers.edu/

mailto:[email protected]


Water Resources Program

NJDEP Definition

"Green Infrastructure" means methods of stormwater management that reduce wet weather/stormwater volume, flow, or changes the characteristics of the flow into combined or separate sanitary or storm sewers, or surface waters, by allowing the stormwater to infiltrate, to be treated by vegetation or by soils; or to be stored for reuse. Green infrastructure includes, but is not limited to, pervious paving, bioretention basins, vegetated swales, and cisterns.


US EPA DefinitionGreen infrastructure is a cost-effective, resilient approach to managing wet weather impacts that provides many community benefits. While single-purpose gray stormwater infrastructure—conventional piped drainage and water treatment systems—is designed to move urban stormwater away from the built environment, green infrastructure reduces and treats stormwater at its source while delivering environmental, social, and economic benefits.


What is Green Infrastructure?

…an approach to stormwater management that is cost-effective, sustainable, and environmentally friendly Green Infrastructure projects:

• capture • filter • absorb • reuse

stormwater to help restore the natural water cycle.


How does Green Infrastructure work?

Green Infrastructure practices use soil and vegetation to recycle stormwater runoff through infiltration and evapotranspiration.


A Brief History of Stormwater Management


1st Attempt at Stormwater ManagementCapture all runoff, pipe it, and send it directly to the river . . .prior to mid 1970’s


2nd Iteration of Stormwater ManagementCapture runoff, detain it, release it slowly to the river…mid 1970’s to 2004

− Detain peak flow during large storm events for 18 hours (residential) or 36 hours (commercial)

− Reduce downstream flooding during major storms− Use concrete low flow channels to minimize erosion, reduce standing

water, quickly discharge low flows− Does not manage runoff from smaller storms allowing stormwater to

pass through the system − Directly discharges stormwater runoff to nearby stream, waterway, or

municipal storm sewer system (at a controlled/managed rate)


3rd Generation of Stormwater Management• Reduce stormwater runoff

volume

• Reduce peak flows and flooding

…and….

• Maintain infiltration and groundwater recharge

• Reduce pollution discharged to local waterways

abc Action News, August 27, 2012


2004 NJ Stormwater RegulationsMunicipal “Phase II” NJPDES Stormwater Permitting Rules (N.J.A.C. 7:14a)

Stormwater Management Rules (N.J.A.C. 7:8)

• Municipalities and large public complexes must obtain NJPDES permits for their storm sewer system

• Permittees must develop, implement, and enforce a stormwater program that protects water quality

• Permittees must prepare and implement a Stormwater Pollution Prevention Plan (SPPP):

• Municipal stormwater management plan

• stormwater control ordinance• public education program

• Sets forth stormwater management goals for new development:

• Reduce flood damage• Reduce soil erosion• Protect public safety through

proper design and operation of stormwater management basins

• Minimize increases in peak runoff

• Maintain groundwater recharge• Protect water quality

• Sets forth the required components of regional and municipal stormwater management plans


Current Stormwater Management Approach

• Use nonstructural management strategies

• Protect communities from increases in stormwater volume and peak flows as a result of new development

• Maintain groundwater recharge

• Protect waterways from pollution carried in stormwater runoff

NJ.com, August 28, 2011


2015 CSO Individual Permits• Under this permit action, the permittee will be required to evaluate a

broader range of control alternatives… The control alternatives shall include: green infrastructure, increased storage in the collection system, STP expansion/storage, I/I reduction, sewer separation, discharge treatment and bypass of secondary treatment at the STP.

• The permit requires the permittee to consider at least the following: Green infrastructure which allows for stormwater management close to its source, providing both water quality treatment and some volume control. The volume that is retained onsite and kept out of the sewer system can help delay expensive gray infrastructure maintenance and upgrades. Some examples of green infrastructure measures include, but are not limited to, pervious pavements, street bump-outs, rain gardens, and tree trenches.


Why Green infrastructure?• Remediates flooding• Improve water quality• Reduces combined sewer

overflows• Cost-effective• Small-scale systems that

capture runoff near its source• Mimic and help restore the

natural hydrologic cycle • Enhances aesthetics • Cleans the air• Reduces heat island effect


GREEN INFRASTRUCTURE TECHNOLOGIES


Green Infrastructure Systems:

• Vegetative Systems• Bioretention Systems/Rain Gardens • Stormwater Planters

• Harvesting Systems• Cistern/Rain Barrel• Downspout Planter Boxes

• Storage Systems• Street Trees/Stormwater Tree Pits• Pervious Pavement


Difference between the types of systems:• Vegetative Systems: focus on reducing water quality impacts. These systems

are typically located close to the sources of runoff and can manage the smaller storms of several inches. The main treatment mechanisms are infiltration, filtration, and evapotranspiration.

• Harvesting Systems: focus on the conservation, capture, storage, and reuse of rainwater. These systems are located close to residential and commercial buildings.

• Storage Systems: provide storage of stormwater, quantity control, and infiltrate stormwater runoff. These systems are typically located close to runoff sources within residential, commercial, and industrial landscapes. The main treatment mechanism is reducing peak flows of stormwater by storing it before it enters the sewer system.


Bioretention Systems/Rain Gardens

Vegetative System

Landscaped, shallow depression that captures, filters, and infiltrates stormwater runoff.


Bioretention Systems / Rain GardensHow it works: These systems capture, filter, and infiltrate stormwater runoff using soils and plant material. They are designed to capture the first few inches of rainfall from rooftops, parking areas, and streets.

Benefits: Removes nonpoint source pollutants from stormwater runoff while recharging groundwater

Restore/“mimic” predevelopment site hydrology• Infiltration• Evapotranspiration

Improve water quality• Sedimentation, filtration, & plant uptake• Microbial Activity

Add aesthetic value• Plant selection

Vegetative System


Bioretention System/Rain Garden


Bioretention Systems / Rain Gardens

Vegetative System


Vegetative SystemRain garden at Catto School in Camden, NJ


Vegetative SystemRain garden installation at Ferry Avenue Library in Camden, NJ


Stormwater Planters

Vegetative System

Vegetated structures that are built into the sidewalk to intercept stormwater runoff from the roadway or sidewalk.


Stormwater PlantersHow it works: • It is a structural bioretention system that is installed in a

sidewalk• Contains a layer of stone that is topped with bioretention

media and plants or trees • Captures stormwater runoff from the roadway and sidewalk• Once the system fills up, runoff flows back into the street or

into an overflow drain which connects to the sewer system

Benefits: • Allows water to infiltrate into the ground

Vegetative System


Stormwater Planter


Stormwater Planters

Vegetative System

Typically, 4 feet wide by 20 feet long


Vegetative SystemStormwater Planter at the Brimm School in Camden, NJ


Vegetative System

Stormwater Planters at Community Garden in Camden, NJ


Cisterns/ Rain Barrels

Vegetative System

These systems capture rainwater, mainly from rooftops, in cisterns or rain barrels. The water can then be used for water garden, washing vehicles, or for other non-potable uses.


Cistern/ Rain BarrelHow it works: • Capture, diversion, and storage of rainwater

Benefits: • Eliminates need for complex and costly

distribution systems • Provides additional water source• Landscape irrigation• Reduces flow to stormwater drains• Reduces non-point source pollution• Delays expansion of existing water treatment

plants• Reduces consumers’ utility bills

Harvesting System


Rainwater Harvesting


Cistern at the Neighborhood Center in Camden, NJ

Harvesting System


Cistern at St. Bartholomew’s Church in Camden, NJ

Harvesting System


Harvesting System

Cistern at Front Street Community Garden in Camden, NJ


Downspout Planters

Harvesting System

Wooden or concrete boxes with plants installed at the base of the downspout that provide an opportunity to beneficially reuse rooftop runoff.


Downspout Planter: Harvesting System

How it works: • Constructed boxes placed against buildings• Contains stone/gravel topped with sandy compost

mixture and plants• Designed with underdrain and overflows• Disconnects downspouts

Benefits: • Aesthetics• Provide some rainfall storage

Harvesting System


Downspout Planter


Design Parameters for Downspout Planters:

• Planter box must be adequately reinforced to hold soil, stone, and plants

• Limited capacity for stormwater retention – mostly infiltration

• Soil infiltration rate is 5.0 inches per hour• Underdrains are installed to drain the water

after the storm event


Downspout Planter: Harvesting System

Harvesting System


Downspout Planter Boxes at Acelero Learning Center in Camden, NJ Harvesting System


Downspout Planter Boxes at Davis School in Camden, NJ

Harvesting System


Stormwater Tree Pits/Street Trees

Storage System

Pre-manufactured concrete boxes or enhanced tree pits that contain a special soil mix and are planted with a tree or shrub. They filter stormwater runoff and provide limited storage capacity.


Stormwater Tree Pits/Street TreesHow it works:• Pervious concrete is installed to act as an additional storage

system to increase the stormwater capacity treated by the system.

• Systems with low infiltration rates due to soil composition are often designed with an underdrain system to discharge the water.

• This system is often designed with conventional asphalt in areas of high traffic to prevent any damage to the system.

Benefits: • Improved aesthetics• Healthier trees• Reduced heat island effect

Storage System


Stormwater Tree Pit/Street Trees


Stormwater Tree Pits/Street Trees

Storage System


Pervious Pavements

Storage System

These surfaces include pervious concrete, porous asphalt, interlocking concrete pavers, and grid pavers. These materials allow water to quickly pass through the material into an underlying layered system of stone that holds the water, allowing it to infiltrate into the underlying uncompacted soil.


Pervious PavementHow it works: • Underlying stone reservoir• Porous asphalt and pervious concrete are manufactured without

"fine" materials to allow infiltration• Grass pavers are concrete interlocking blocks with open areas• Ideal application for porous pavement is to treat a low traffic or

overflow parking areaBenefits: • Manage stormwater runoff, minimize site disturbance, promote

groundwater recharge• Low life cycle costs, alternative to costly traditional stormwater

management methods• Contaminant removal as water moves through layers of system• Allows runoff to flow through the surface to an underlying storage

layerStorage System


Pervious Pavement

Storage System


Storage System

Porous Pavement (Asphalt) at Yorkship School in Camden, NJ


Storage System

Porous Pavement (Concrete) at Wiggins School in Camden, NJ


Green Infrastructure Manual for New Jerseyhttp://water.rutgers.edu/GreenInfrastructureGuidanceManual.html

http://water.rutgers.edu/GreenInfrastructureGuidanceManual.html

QUESTIONS?

Jeremiah Bergstrom, LLA, [email protected]

Christopher C. Obropta, Ph.D., [email protected]

www.water.rutgers.edu



http://www.water.rutgers.edu/

Green Infrastructure Implementation

68

Right of Way and Parcel-based GI

69

Gray vs. Green - Streets

Photo Credit: EPA

Green and Complete Streets• A green and complete street is

designed to mange a street’s stormwater runoff by using green infrastructure, and provide safe and accessible routes for all users.

Photo: Portland, OR. Credit: Kevin Robert Perry

Why Should Streets be Green?

49%

29%

17%

5%

Land Area by Use in New York City

Building & Parking Lots

Streets

Parks & Open Space

Vacant Land

16%

17%

57%

6% 3%

Land Area by Use for a Residential Development

in Olympia, WA

Roof

Street

Lawn

Parking/ Driveways

Sidewalk

All Transportation Surface = 26%(Impervious Surface Reduction Study. Olympia, WA, 1995) (PlaNYC Sustainable Stormwater Management Plan, 2008)

Typical suburban street

Convey stormwater into buried conveyance

systems

Capture surface runoff into a landscaped area.

Complete and green suburban street

Maplewood, MN (EPA)“Anywhere, USA” (EPA)

73

Green Street Techniques• Bioretention• Bioswales• Permeable Pavements• Tree Boxes

74

Benefits of Green Streets• Reduction of stormwater• Enhanced safety• Improved water quality• Reduce heat island effect• Community livability• Catalyst for redevelopment

75

Identifying Green Streets Sites• New streets!• Look for opportunities

Curb lane

Tree Planting

Excess Width

Current Complete Green Streets

Street Right of Way

Image : Nebraska Avenue, Washington, DC. Credit: DDOT

Sidewalks

Image : San Francisco, CA. Credit: EPA

Image : Kansas City, MO. Credit: BNIM Architects

Intersections

Medians

Portland, OR (EPA)

Washington, DC (EPA)

Portland, OR (Kevin Robert Perry)

80

Alleys

Credit: Philadelphia Water Department

83

Parcel-based Techniques• Bioretention/Rain Gardens• Permeable Pavement• Cisterns• Infiltration Basins• Wetlands• Green Roofs• Urban Agriculture

Infiltration Basins

84

Wetlands

85

Image: Constructed Wetland Credit: NJDEP

Image: Submerged Gravel Wetland Credit: University of New Hampshire

Green Roofs

86

Credit: Wetland Studies and Solutions, Inc.

Urban Agriculture

87

Image: Rooftop Farm at Brooklyn Navy Yard Credit: Brooklyn Grange

89

Benefits of Parcel-based GI• Reduction of stormwater• Improved water quality• Reduce heat island effect• Community livability• Catalyst for redevelopment

Regional Project Screening and Prioritization: OverviewIdentifying Parcel-based GI Sites

• Ownership = Public• Distance to Storm Drain

less than 500 ft• Some portion of the site

has slope < 10 percent• Not located in river bed

and in conveyance channels

S Mona B

lvd

E 120th St

Mona B

lvd

Los Angeles River WatershedPotential Centralized BMPs

Mona Park

NAD_1983_StatePlane_California_V_FIPS_0405_FeetMap produced 05-19-2011 - E. Moreno

LegendRoads

Stormwater Main

Path for Ingress\Egress

Area of Geotechnical Investigation

0 120 24060Feet

Flow Direction±

Glen Avenue

Drain System

Screening Criteria

• Green infrastructure on public parcels

• Green infrastructure on private residential parcels

• Green infrastructure resulting from redevelopment

Parcel-based Siting

93

Multi-Use, Multi-Benefit

94

GREEN STREETLID AND

REGIONALNONSTRUCTUR

AL

Street-Scale Green Street Opportunity and Drainage Area

Data

Combined Green Infrastructure Approach

Conceptual Designs and Renderings

• General Maintenance:– Pruning– Mulching– Irrigating

97

Maintenance Considerations

• Intermediate Maintenance:– Remove clogging layer & top 3 inches of media to

increase surface ponding volume

98


• Permeable Pavement Maintenance:– Street Sweeping– Weed removal

99


GREEN STORMWATER INFRASTRUCTURE (GSI) CASE STUDIES

Rod Ritchie, AKRF September 14, 2016

Aramingo Business Improvement District

The BID is a business association/shopping district Economic Development & Job Creation Sanitation and Security Services

BID covers an area of roughly 70 acres Highly impervious Highly constrained Unmanaged

stormwater Unwelcoming

environment

Developed Stormwater Mitigation Scenarios

GSI Master Planning Project Identified opportunities and constraints through desktop

assessment and field inspections Interactive Design Sessions to evaluate and rank

alternatives• Regional GSI systems• 2 Public ROW Scenarios• Smaller GSI systems on private property

Cost for Public GSI

Developed cost estimates for design scenarios Scenario 1 - public only $7.71 per sf Scenario 1 – public & private $7.62 per sf Scenario 2 – public only $$5.62 per sf Scenario 2 – public & private $5.16 per sf

American Street GSI Planning Study

14-Block Underdeveloped industrial corridor Extended Study Area Proposing GSI to stimulate transformation Over-widened right-of-way and underdeveloped area

creates opportunity

Design Approach

Manage 1” of public and private runoff Multi-objective

Maintain multiple uses – pedestrian, truck traffic, bicycles, public space

Preserve industrial character Enhance economic development potential Maintain

community connections – schools, green space, trails

Design low maintenance systems

Enhance safety

Opportunities and Constraints

Industrial – Commercial Vacant – Small

residential pockets Pedestrian – Institutional

– Residential Property value gradient

American Street Design

Developed typical layouts and renderings Curbside bioretention areas Curbless design to allow direct

sheet flow Modular low-maintenance forebays Slow-release irrigation trenches Access ports for private customers

Major Strategies for Wider Study Area

Vacant Lots Development/Redevelopment Partnerships School/Park Retrofits Sidewalk Bioretention

American Street Summary

Corridor only 55 greened acres $300 - $400k per

greened acre Total Cost is $16.5 –

22M Vacant Lots

43 Greened Acres $100 - $300k per

greened acre Total Cost is $4.3 –

12.9M

Schools and Parks 36 Greened Acres $100 - $300k per greened

acre Total Cost is $3.6 – 10.8M

Sidewalk Bioretention 70 Greened Acres $300 - $400k per greened

acre Total Cost is $21 – 28M

Private Property Scenarios

Looked at 4 individual properties

ShopRite

5 acre site 97% Impervious Existing Charges

are $2,000 per month

ShopRite GSI Concept

Could manage 4.2 acres of IA Project cost is $460,000 ($110k/acre or $2.51/sf) SMIP Grant would cover $420,000 Cost to ShopRite is $40,000 Annual savings is $17,000 Break even is roughly 2 years Could combine GSI with re-paving project to reduce

project cost

Summary

GSI Improvements will provide city-wide benefits and benefits to local property owners Stormwater charge reductions for business owners Will attract more visitors to the corridor Could explore public/private partnerships to reduce

implementation costs Recommend developing public/private cost sharing

policy Cost share Long-term O&M Financing options

Newman Paper Company – Philadelphia, PA


40-acre paper recycling facility located on the North Delaware Riverfront

Uses large quantities of potable water in paper making process 72.7 million gallons per

year Total PWD Charges

$824,400 for water, sewer and stormwater


Achieve reductions in both stormwater and potable water charges

Collect water from 265,000 sf (6.08 acres) of roof area into holding tanks

Capture of 4.8 million gallons per year or approximately 7% of process use

Process is a volume reducing practice due to evaporative losses

Captured stormwater consumed by process within 72 hours

Newman Paper – Summary

Project cost = $500,000 ($1.68/square foot)

Total stormwater credits = $26,500/year

Potable water charge savings = $15,600/year

SMIP grant of $370,000 ($1.39/square foot)

Newman contribution of $130,000 ($0.49/square foot)

Cash flow break even period of less than 5 years

Questions?

Text ‘njfuture’to 55498

Green Infrastructure Survey for Developers and Design Professionals

https://goo.gl/forms/97jD0KoalJbfVyKW2

Part II:

Part II

What can municipalities do to make green infrastructure happen?

The Path Forward: Tools and Options for Towns

Mainstreaming Green Infrastructure in Your Town

Options and Tools:

Municipal Plans

Ordinances

Incentives

Processes

Plans• Green Infrastructure Plan

– Includes projects that can become a mitigation plan.

• Master Plan– Guiding Principles– Conservation element– Circulation element– Land Use element

• Stormwater Plan• Capital Plan (roads, parks,

muni facilities/DPW, schools)• Large-scale Land Use Plans

– Redevelopment Plans– Affordable Housing Plan

Planning Principles• Protect Natural Resources

– Trees– Open Space– Stream corridors

• Promote Compact Development and Infill

• Complete Streets / Green Streets

• Efficient Parking• Green Infrastructure

Stormwater Provisions

OrdinancesStormwater Ordinance

Require volume retention for 1.25”, 2-hour design storm

Allow waivers only if mitigation requirements are met (you need a mitigation plan w/ specific projects or a “fee in lieu”)

Emphasize the “green” in GI. Go for benefits beyond holding volume – e.g., street trees and pocket parks for economic and public health benefits.

OrdinancesLand Use Ordinance

CurbingParkingStreetscapeIncentives –

e.g., FAR, impervious cover reduction

Incentives

• Signal: This is what we want.

• Expedited review• Credits for Certain GI

Practices– Green Roofs– Pervious Pavements– Trees– “Disconnected” Impervious

• Other Incentives– Increased FAR

Walk the Talk: Processes

• Encourage sketch plan and early meeting – informal

• Offer green review, with clear guidance and support

• Provide information about options, practices, greatest impact.

• Checklists for all. Minimize guesswork.

Walk the Talk: Education and Training

• Public Works – key players

• Planning Board, EC, ZBA• All municipal and public

projects maximize GI (schools, parks, streets, etc.)

• Staff training• Municipal maintenance

practices

Walk the Talk: Municipal Projects

• Capital Plan – GI in every project• Achieve 100% retention and

demonstrate various practices:– Infiltration (porous pavement– Capture and re-use (cisterns at

muni facilities, use water for vehicle washing, irrigation, etc.)

– Uptake by plants / Evapotranspiration

• One high visibility GI project• Interpretive signage – show & tell

Make Life Easier: Public Education and Acceptance

• Public Understanding of GI and Stormwater

• Embrace of different landscape aesthetics (less lawn, more plants)

• Benefits:– Urban heat island reduction /

energy savings– Better air quality– Higher property values– Increased foot traffic in downtowns– Human health (physical and

mental health)– Habitat – pollinators, songbirds,

amphibians

Resources

• Rutgers!– GI Guidance Manual for NJ– Presentation: “Ideas and Resources

for Implementing GI In Your Community”

– Fact sheets galore• EPA

– Modeling Tools– Cost-Benefit Resources page– Green Infrastructure Wizard:

“GI-Wiz”– Funding Sources

• Delta Institute’s Green Infrastructure Toolkit for Property Owners and Municipalities: Green Infrastructure Designs: Scalable Solutions to Local Challenges

Thank you!Louise Wilson

Green Infrastructure [email protected]

609-393-0008 ext. 109


Lessons Learned from HobokenNew Jersey Society of Municipal EngineersJennifer Gonzalez, Principal PlannerCity of Hoboken

Green Infrastructure Strategic Plan


Rainwater Harvesting

Code §136-2

Legalized use of rain barrels in 2011 Rain barrels were previously considered a

nuisance Any container maintained for the short-term

collection of rainwater must have a properly fitting lid, be access-resistant to insects and rodents and must be maintained in good working order at all times and must be kept in a clean and sanitary way

City Hall

Green Roofs

Code §196-28

Incentivized use of green roofs in 2015 Green roofs are encouraged wherever

possible (especially on roofs with surface area of ≥ 5,000 SF)

If a green roof is provided on at least 50% of the roof surface, the remainder may be utilized for a roof deck

Rooftop gardens are considered a green roof and may cover up to 90% of a roof's surface area

14th & Park Street

Site Plan Review

Code §196-34

City requires the submission of a stormwater management plan with development applications, “setting forth the proposed method of controlling and managing stormwater on the site,” but:

Code does not specify methods for controlling and managing stormwater

Code does not require or encourage green infrastructure as a method

Planning Board routinely requests that applicants:

Increase the on-site stormwater detention beyond that required by NHSA (often successful in achieving double the required capacity )

Use green infrastructure for stormwater management (specifically green roofs and rain gardens)

Proposed Amendment to Stormwater Management Plan

Code §166

Current Stormwater Management Plan was adopted in 2007

Only applies to major development projects (≥ 1 acre disturbance) in the MS4 area

Purpose of the proposed amendment is to supplement the Stormwater Management Plan, tie in the Green Infrastructure Strategic Plan

Sets broad stormwater design and performance standards to address erosion control, groundwater recharge, stormwater retention, runoff quantity and runoff quality

Applies to new development, redevelopment and disturbance ≥3,000 SF across the entire City

Ensures that individual property owners are not limited in how they fulfill regulatory requirements

Fosters innovation

Proposed Amendment to Stormwater Management Ordinance

Code §166

Requires using nonstructural BMPs or green infrastructure to the maximum extent practicable before using structural BMPs

If applicant contends that nonstructural BMPs or green infrastructure are infeasible, applicant bears the burden of proving infeasibility

Requires an O&M plan for stormwater management BMPs

References, and supersedes, latest NHSA Technical Requirements for Stormwater Management:

Focuses on controlling runoff volume, not runoff rate

Different Quantity Volume method of calculation

Does not distinguish an application based on sanitary sewerage flows

Like NHSA, gives credit for removal of 25% impervious cover

Green Infrastructure in Capital Projects

Southwest Park

Northwest Park

First Street

Washington Street

City Hall


Rebuild by Design – Hudson River

Jennifer Gonzalez AICP, ENV

SPPrincipal PlannerCity of [email protected]

Thank you!

www.hobokennj.govhttps://www.facebook.com/hoboken https://twitter.com/cityofhoboken https://www.instagram.com/hobokennj https://vimeo.com/hobokennj https://www.flickr.com/photos/hoboken



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