green redevelopment reduces csos in new haven, gnhwpca

8/13/2019 Green Redevelopment Reduces CSOs in New Haven, GNHWPCA

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IMPROVED GIS SYSTEM - BUDGET MAINTENANCE2OO8 PUBLISH DESIGN CRITERIA MANUAL

IMPROVED INSPECTIONS

INFLOW REDUCTION MAXIMIZINGUSE OF THE CT DEEP CWF LOAN

PROGRAM

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FORMERLY HAD LOOKED TO AN INFRASTRUCTUREINTENSIVE APPROACH TO CSO PLANNING

$580M+ PROGRAM PROMPTED PROACTIVE RETHINKING OFTHE CSO APPROACH

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Authority' s combined sewer system. ,_ .,'':Separate wherever possi ble,

make developers build infras

if a separated system is within

reasonable distance to the site.

R*quire the developer to install infilsystems and/or facilities to detain the Z-year6-hour post development peak flow rate.

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30 individual projects

50 acres of combined sewer area separated

Technologies employed to detain the 2 year 6 hour designstorm (2.05 inches of rain)

Rain water storage tanks ',. GNHWP.A2.YR6'H.URSToRMEVENT'ilBioswales and tree wells ,, i\Water features ,i I \,.\"' ,I

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ln the preceding example, a one,acre site was "effectivelyreduced" to 0.35 acres viagreen redevelopment

It would require disconnectionof 35 homes with roof leadersto achieve the same 0.65 acrereduction in the hydraulicmodel based on theassumptions on the next slide

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TECHNICAL ASSUMPTIONS

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Average lot size is 1/Bth of an acre

Effective area reduction is 15%(ARF 25% to 10%)

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1/8th acre X 15% = 0.019 acres per home

0 65 acres / 0.019 acres per home = 35

Based on recent projects in Hartford, the cost

to disconnect roof leaders from one home is

$25,000.

* BASED ON A PAPER PRESENTED AT NEWEA ANNUAL CONFERENCE INJANUARY 2013


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EQUATIN INFLOW REDUCTTON FROM GREENREfrEVELOPMENT PROJECTS TO ROOF LEADERDISONNECTTON

E HARTFORD

' 50 acres of combined sewer area have beenseparated via green redevelopment projects inNew Haven

* fhis equates to disconnection of 1700 homeswith roof leaders (35 homes/acre X 50 acres=1700 homes)

r, Assuming a cost of $25,000 per home, thisequates to a total cost of $ 42.5 million

TQUATTNG THE COST Or RE$N REDEVELOqMENTPROSECTS TO SEWER SEPAfrATION OT PUSLTC INnLOWs,o{/frcrs'

i S ln the preceding example, a one acre site was"effectively reduced" to 0.35 acres via greenredevelopment

& lt would require separation of 1.3 acres to achievethe same 0.65 acre reduction in the hydraulic modelbased on a reduction in ARF from7l%to25%


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E NEW HAVEN50 acres of combined sewer area have beenseparated via green redevelopment projects

This equates to sewer separation of 65 acres

(1.3 acres/acre X 50 acres = 65 acres)

Assuming a cost of $250,000 per acre* thisequates to a total cost of $16.3 million

*BASED ON RECENT GNHWPCA PROJECTCOSIS

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E PHILADELPHIA

$2,4 B 25 year green infrastructure program

Use green infrastructure to recover 9,654

"green acres"

A "green acre" is 1 inch of rain over an acre

Cost estimate $250,000 per "green acre"*

Ratio acres based on 2.05" vs. 1" of rainu2.05 X 50 acres = 102.5 "green acres"

Total cost $25.6 million-BASED ON A PAPER PRESENTEDAT WEFTEC IN OCTOBER 2013


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EQAATTN TfrE COST 0r GffEE/vfr.EPffVELaPW*NT PRO}YCTS TO WNAT'S SETNGSmffrJ& #ruf#'e CS0 CO{*{M{lltlfffiFS

* NEW YORK CITY,,. Manage the first inch of rain from at least 10% of

impervious surfaces in CSO areas with green

infrastructure elements - 5 year program

Cost estimate $450,000 per acre*(managing > 100/0 of impervious area)

' Ratio acres based on capturing2.05" vs. 1" of rainx2,05 X 50 acres

=102.5 acres

:, Total cost $46.1 million

*BASED ON A PAPER PRESENTED AT WEFTEC IN OCTOBER 2013

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Since 2008, the GNHWPCA has approved 30 greenredevelopment projects which have separated 50acres of combined sewer area

These green redevelopment projects have reducedCSO events by 7 per year and CSO volume by 3.3MG per year

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Disconnecting 1700 homes with roof leaders inHartford at a cost of $42.5 million

Separating 65 acres of combined sewer area inNew Haven at a cost of $16.3 million

Using green infrastructure to recover 102.5 "greenacres" in Philadelphia at a cost of $25.6 million

Using green infrastructure to manage runoff from102.5 acres in NYC at a cost of $46.1 million

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& Questions ???& Contact information

Tom Sgroi - ts$ffiqnffi$e&wf;se*S{ryB ruce Ki rkl an d - Mry&{AgS&Xg.l:W&S&,*qryl

green redevelopment reduces csos in new haven, gnhwpca

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