Gre reen en Fi Firs rst t Ci City ty-Wide Wide St Stormwa rmwater ter As Asse sessme ssment nt September 26, 2016
At the turn of the 20th century, Pittsburgh embarked on its biggest infrastructure improvement campaign, building sewers, water lines, roads, power lines that created the city we know today.
THE E PROBLE LEM M - We have a STORMW RMWATER ATER MAN ANAG AGEME EMENT NT problem resulting in: Poor Water Quality CSOs/SSOs Illicit Discharges – sewage in storm sewers Surface Flooding Basement Sewage Flooding Sewers that are 80 – > 100 years old Consent Decree and MS4 Requirements We need an AF AFFOR ORDA DABLE LE PLA LAN N to address AL ALL L OF THES ESE E ISSUES UES
Ov Over erfl flow ows | | Fl Flooding ng |Wat ater er Qua uality ty SA SAME ME ROO ROOT CAU AUSE SE Issue 1: Issue 2: Issue 3: CSOs and SSOs Localized Flooding Water Quality Exces essi sive ve Stormwat water er Ove verloa oading ing Our Already ady Stress ssed d Sewer System Sol olut utio ion: n: Inv nvest st in in s stor ormwater water managemen nagement t at the he sur urface ace and nd op optim imiz ize the he sewer system
As the Pittsburgh Region grows, we seek a comprehensive SYSTEMS approach to address all of our community and infrastructure needs with one investment.
The he Cl Clea ean n & G Gre reen en plan an pre rese sent nts s solut so ution ons s th that at ar are: e: Provides a unified, comprehensive, & long term approach toward regulatory compliance More cost effective to address multiple CO COMP MPLIANT NT issues, solving the problem rather than addressing a single symptom. AFFOR ORDABLE ABLE Strategic design for system integration & EN ENGI GINEERED NEERED optimization to increase resiliency BENEFIC EFICIA IAL Maximize triple bottom line – environmental, economic and social benefits REP EPLICABL CABLE Methodology and protocol for implementation across all watersheds
The he Cl Clea ean n & G Gre reen en plan an: AD ADAP APTIVE E PR PROC OCES ESS PLAN N AND IMPLEME PLEMENT EVALU LUATE ATE INVEST ESTIGATE IGATE DESIGN SIGN DEMONSTRA TE TE CS CSO re O reduction ion priva ivate-publi lic sma mall ll-scale le ind indivi ividual l mo monito itoring ing projec jects • • • • baseme ment fl flooding ing partnerships ips projec jects mo monito itoring ing CS CSO O • • eli limi mination ion urban plan lanning ing large demo lar monstration ions reduction ion • • water qu wa quali lity market studies ma ies education ion & tr & traini inings triple iple bo bottom m li line • • • • stream m infl inflow coordina inate wi with integrated wa int watershed assessme ment • • • hazard loc location ion develop lopers manageme ma ment • fi field ld verif ifica ication ion poli licy & & code • • changes changes
The he Cl Clea ean n & G Gre reen en plan an: PROC PR OCES ESS We need to keep rainwater out of the S system. We can be most effective by S focusing efforts on the sheds that F contribute the most to the system. We identified the top 30 sheds and D overlaid other criteria: F RISK LOWER RISK D OPPORTUNITY EASE OF IMPLEMENTING S DEVELOPMENT HIGH ACTIVITY SYNERGIES F MULTIPLE BENEFITS F D FLOOD STREAM INFLOW DEVELOPMENT
The he Cl Clea ean n & G Gre reen en plan an is is EN ENGI GINE NEER ERED ED Identify highest contributing PWSA Stormwater inlets based on total impervious area. Prioritize how we select locations for green infrastructure implementation projects. This approach addresses the city’s stormwater issues with one investment.
The he Cl Clea ean n & G Gre reen en plan an is is EN ENGI GINE NEER ERED ED ESTIMATED 10:1 Loading Ratio
The he Cl Clea ean n & Gr Gree een n Inf nfra rast stru ruct ctur ure e Pl Plan an i is s a a “ St Stor ormw mwat ater er Ov Over erla lay ” to to g gui uide e ou our r fu futu ture re visi sion on. . The purpose of the City-Wide Assessment is to create a “ Green en First ” approach to regulatory compliance that : PEOPLE: increases resiliency and minimizes hazards PLANET: improves our rainwater system functioning PLACE: enhances urban environments PERFORMANCE: stimulates economic growth
PROJECT CT AC ACTION N AR AREAS: AS: A42: Negley Run/Washington Blvd M29: Four Mile Run/Junction Hollow A22: East End/Shadyside Saw Mill Run M42: Streets Run Comprehensive watershed scale solutions with a single investment
A42: WASHINGTON BLVD | NEGLEY RUN SILVER LAKE MELLON PARK
A42: WASHINGTON BLVD | NEGLEY RUN GI WORKFOR FORCE CE TRAINI NING NG AT HIGHL HLAND AND PARK K & THE E VA HOSPIT ITAL AL CAMP MPUS RIVERFRONT NT CONNECT NECTION ION STORMW MWATER ATER | SEDIMENT IMENT | FLOOD D CONTR TROL Leech Farm Road - Before TRANSIT SIT HUB DEPA PAVING VING Leech Farm Road - After
A42: WASHINGTON BLVD | NEGLEY RUN Little Negley Run is a daylighting project that disconnects new development via an open air sewer separation project. Community vetted project as part of the Choice Neighborhood Planning grant. Secured $1.2 Million in design funds in a partnership with Army Corps.
M29: FOUR MILE RUN | JUNCTION HOLLOW PANTHE HER HOLLOW OW LAKE JUNCTIO TION N HOLLOW STREAM DAYLIGHT IGHTING ING ALMONO O SITE
M29: FOUR MILE RUN | JUNCTION HOLLOW This plan addresses flooding at the bottom of the 4 Mile Run watershed that impacts nearby residents and businesses. Stormwater runoff from the Squirrel Hill Neighborhood is reestablished in the historic Panther Hollow stream channel.
M29: FOUR MILE RUN | JUNCTION HOLLOW SCHENL ENLEY EY DRIVE COMP MPLET ETE E STREET ET RETROF OFIT IT PANTHER HOLLOW LAKE RESTOR ORE E PANTHE THER HOLLOW OW STREAM AM RETENTION ENTION BASINS INS AND CONSTR TRUC UCTED ED WETL TLANDS NDS
M29: FOUR MILE RUN | JUNCTION HOLLOW CONSTR TRUC UCTED ED WETL TLANDS NDS REESTABL STABLIS ISH H RIVERFRONT NT RETENTION ENTION BASINS INS AND CONNECT NECTION ION CONSTR TRUC UCTED ED WETL TLANDS NDS DISTR TRIB IBUT UTED ED UNDER ERGROUN OUND STORAGE
A22 SEWERSHED | EAST END FLOODING GARFIELD FRIENDSHIP POLISH HILL BLOOMFIELD OAKLAND SHADYSIDE August 31, 2014 Rain Event: 1.05 ” in 15 Minutes ISSUES: ES: Surface Flooding, Only 11 Basement Sewage Flooding (Backups) Officially Reported 2015 Homeowner Survey Revealed Actual Chronic 136 Basement Backups
A22 SEWERSHED: SHADYSIDE PROJECT
A22 SEWERSHED: MELWOOD PROJECT A2 A22 S 2 SEW EWER ERSH SHED ED
A22 SEWERSHED: GARFIELD PROJECT A2 A22 S 2 SEW EWER ERSH SHED ED
Sa Saw Mi Mill Run un W Wat ater ersh shed ed Pl Plan anni ning ng PR PROC OCES ESS Frequent flooding of Saw Mill Run Watershed has contributed to disinv nvestm stment nt in the watershed communities. Integrated Watershed Management is a water r quali lity ty -based approach to meet all of the federally mandated reductions in sewage overflow and stormwater pollution. Working ing togethe ther r with the 11 other municipal paliti ities es, DEP, ALCOSAN, and Army Corps of Engineers, PWSA is developing projects with the most water quality and community nity ben enef efits ts , regardless of municipal borders. DEP conducted biological sampling and found very few fish and macroinvertebrates, indicating very impaired water quality.
Saw Mi Sa Mill Run un W Wat ater ersh shed ed Pl Plan anni ning ng In AC ACTI TION ON Green en Tree Mt. Oliver ver Pitt ttsb sburg rgh Dormo mont Maximize cost-effective water quality: Baldwi win Brent entwo wood • Collecting water quality data from multiple sampling Mt. Lebanon locations in the stream • Monitoring flow in sewer system and at outfall Whiteh ehall Castle e Demonstration projects selected by water quality • Shannon improvements Bethel • Developing a model (with Army Corps assistance) that Park we will use to identify additional projects to improve water quality.
STREETS RUN: HAYS AREA FLOODING
STREETS RUN: HAYS AREA FLOODING Issue ue: Flooding occurs for a 2-year design storm and larger events meaning over 0.718 ” in 15 minutes. Solut ution ion: Manage 30% contributing area (pervious or impervious) to eliminate flooding and provide a higher level of service for customers. Flooding limits from the August 31, 2014 event
We e so soug ught ht the he mo most st ef effe fective ctive pr proje ojects cts and nd sy syst stems ems that hat wo woul uld d pr provid ovide e com ommu munity nity ben enef efit its ed . in ea n each ch sh shed
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