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2011 Low Impact Development SymposiumImplementation and Evaluation of Green Infrastructure Stormwater Retrofits to Reduce Combined Sewer Overflows at a Public Housing Facility in New York City

Matthew Jones, EI, PhD, Hazen and SawyerJulie Stein, NYCDEPSandeep Mehrotra, PE, Hazen and SawyerWilliam Leo, PE, HDR‐HydroqualRichard Claytor, PE, Horsley Witten GroupMarcus Quigley, PE, GeoSyntec

September  27,  2011

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NYCGreen Infrastructure

Background

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Mayor Bloomberg’s PlaNYC

A comprehensive sustainability plan to create a greener, greater New York, PlaNYC is a roadmap to achieve 10 goals:

Create enough housing for our growing population

Ensure all New Yorkers have parks within a 10‐minute walk

Clean up all contaminated land in New York City

Develop water network back‐up systems

Improve travel times by adding transit capacity for millions

Achieve “State of Good Repair” on our transportation system

Upgrade our energy infrastructure to provide clean energy

Achieve the cleanest air of any big city in America

Reduce global warming emissions by 30%

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Open 90% of our waterways and protect natural areas

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NYC Green Infrastructure Plan

Build cost‐effective grey infrastructure

Optimize the existing wastewater system

Institutionalize adaptive management, model impacts, measure CSOs, and monitor water qualitySustain stakeholder engagement55

Control runoff from 10% of impervious surfaces through green infrastructure and other source controls

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Stormwater Source Control Pilot Study

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Stormwater Pilot StudyObjectives

Develop stormwater pilot designs

Construct and maintain pilots within NYC

Evaluate pilot performance

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Distribution of Stormwater PilotsA Shoelace Park Bioretention

B Bronx River Houses Pilots

C Metropolitan Ave. Blue Roof

D Ridgewood Ave. ETP

E Ridgewood Ave. SSIS

F Eastern Parkway SSIS

G Howard Ave. SSIS

H Blake Ave. ETP

I Union St. ETP

J Union St. SSIS

K Sutter Ave. ETP

L Autumn Ave. ETP

M N&S Conduit Bioretention

N PS 118 Green Roof

O 99th Ave. SSIS

P Far Rockaway Pavement

Q Far Rockaway Bioretention

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Bronx River Houses

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BRH Blue Roof

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BRH Blue Roof

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Orifice Outlet Controls

System Characteristics:•Flexibility

•Size of system•Placement configuration

•Ease of installation•Coarse stone ballast•Retrofit designs•Use existing drains

•Specialized outlet designs•Detention time and flow rate•Minimize clogging

Coarse Stone Ballast(expanded shale)

Geotextile Drainage Layer with Corrugated Plastic

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BRH Blue Roof

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BRH Blue Roof

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BRH Bioretention

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BRH Bioretention Construction

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BRH Bioretention Construction

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BRH Bioretention Construction

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BRH Bioretention Construction

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BRH Bioretention Construction

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BRH Bioretention Construction

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BRH BioretentionApril 2011

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BRH North Parking Lot

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North Parking Lot

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Chamber System

Pre‐Treatment

Diversion Inlet

Outflow Monitoring Manhole

Connection to Combined Sewer

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Stormwater Chambers Construction

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Stormwater Chambers Construction

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BRH South Parking Lot

Replace

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BRH South Parking Lot

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BRH South Parking Lot

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Education Elements

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Stormwater PilotMonitoring Program

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Monitoring Objectives

Storm hydrology and hydraulics

Water quality

Qualitative performance/ maintenance needs

Ancillary benefits

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BRH Blue Roof Monitoring

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BRH Bioretention Monitoring

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Summary

Increases in stormwater source control currently underway

Variety of unique challenges in an ultra-urbanized area

Potential for multiple benefits from stormwater management

Opportunities to provide high level of stormwater management

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Questions?Matthew Jones, EI, PhDHazen and Sawyer, PCmjones@hazenandsawyer.com919‐833‐7152

Sandeep Mehrotra, PEHazen and Sawyer, PCsmehrotra@hazenandsawyer.com212‐777‐8400