Low Impact Development and Stormwater Management in Pennsylvania
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Transcript of Low Impact Development and Stormwater Management in Pennsylvania
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 11
Low Impact Development and Low Impact Development and Stormwater Management in Stormwater Management in
PennsylvaniaPennsylvania
Robert G. Traver, Ph.D., PE Robert G. Traver, Ph.D., PE Department of Civil and Environmental EngineeringDepartment of Civil and Environmental EngineeringDirector, Villanova Urban Stormwater PartnershipDirector, Villanova Urban Stormwater Partnership
II. Stormwater Management in PennsylvaniaII. Stormwater Management in Pennsylvania
Low Impact Development and Stormwater Management in Pennsylvania
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OutlineOutline
DefinitionsDefinitions Pa Stormwater Management Pa Stormwater Management
HistoryHistory Why the Change? Why the Change? Current Pa Stormwater Current Pa Stormwater
Requirements. Requirements.
Low Impact Development and Stormwater Management in Pennsylvania
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Development and the Hydrologic CycleDevelopment and the Hydrologic Cycle
Thanks to MDE
Original from MDE
Low Impact Development and Stormwater Management in Pennsylvania
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Definitions: Objectives of SWMDefinitions: Objectives of SWM Protecting Life & lessening Public Health & Safety RiskProtecting Life & lessening Public Health & Safety Risk Reducing Risk of Monetary Damage to Private / Public Reducing Risk of Monetary Damage to Private / Public
PropertyProperty Minimize disruption of Community AffairsMinimize disruption of Community Affairs Protecting Quality of Surface and GroundwaterProtecting Quality of Surface and Groundwater Enhancement of the Quality of Life in Urban AreasEnhancement of the Quality of Life in Urban Areas
– ASCE Stormwater Manual of PracticeASCE Stormwater Manual of Practice
Low Impact Development and Stormwater Management in Pennsylvania
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ASCE Code of EthicsASCE Code of Ethics– Engineers shall hold paramount the safety, Engineers shall hold paramount the safety,
health, and welfare of the public and shall strive health, and welfare of the public and shall strive to comply with the principles of to comply with the principles of sustainable sustainable developmentdevelopment in the performance of their in the performance of their professional duties – (ASCE 2002)professional duties – (ASCE 2002)
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Definitions - FloodingDefinitions - Flooding
Natural - every 2 years out of channel….Natural - every 2 years out of channel…. Multiple CausesMultiple Causes
– Rains too hardRains too hard– drainage system inadequatedrainage system inadequate– urbanization increases volume / riskurbanization increases volume / risk
opposite… drought?opposite… drought?
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““Risk” - DefinitionRisk” - Definition
Return Period (T)Return Period (T)– Rainfall event equaled or exceeded over a yearRainfall event equaled or exceeded over a year– T = 1/P x 100 2 year storm ~ 50% (P)T = 1/P x 100 2 year storm ~ 50% (P)– 100 ~~~~~~ 1%100 ~~~~~~ 1%
Risk = 1-(1-P)^nRisk = 1-(1-P)^n
Low Impact Development and Stormwater Management in Pennsylvania
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Definitions - Floodplain & Stormwater Definitions - Floodplain & Stormwater ManagementManagement
Distinction Between - Large vs. Small Sites?Distinction Between - Large vs. Small Sites?– Both Required by Regulation Both Required by Regulation
Degree? Agency?Degree? Agency?– Floodplain – RiverFloodplain – River– Stormwater - WatershedStormwater - Watershed– Stormwater - Growing Quality OrientationStormwater - Growing Quality Orientation– Flood Plain - Protection –higher priorityFlood Plain - Protection –higher priority
SimilaritiesSimilarities– Life & SafetyLife & Safety– Public Interest Intense - but brief & InfrequentPublic Interest Intense - but brief & Infrequent– Coming together!Coming together!
Similar structural / nonstructural measuresSimilar structural / nonstructural measures Similar Design Tools - same methods, different orientationSimilar Design Tools - same methods, different orientation Same SystemSame System
Low Impact Development and Stormwater Management in Pennsylvania
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Pa SWM - Historically Based on……..Pa SWM - Historically Based on……..
Groundwater Rich Concern over Peak Flows / Flooding (property damage)
Channel Stability (Cost) “Drainage” Pics from MDE (except as noted)
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1978 – PA ACT 1671978 – PA ACT 167
Peak Flows Limited to Peak Flows Limited to Preconstruction LevelsPreconstruction Levels
All Points Leaving SiteAll Points Leaving Site Municipal ImplementationMunicipal Implementation
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1978 - FOCUS1978 - FOCUS
Peak FlowsPeak Flows Large Storms (100 Yr?)Large Storms (100 Yr?) Individual SitesIndividual Sites
– ““downstream property downstream property line”line”
– Detention BasinsDetention Basins
Low Impact Development and Stormwater Management in Pennsylvania
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From old Design Manual
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Storm HydrographStorm Hydrograph
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1978 - RESULTS1978 - RESULTS Flow Collected and Flow Collected and
ConcentratedConcentrated Detention BasinsDetention Basins
– BIGBIG– Bottom of SiteBottom of Site
Traver 1978
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1978 - Results1978 - ResultsPost
PreTime
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Post w/ SWM basin
Lost InfiltrationIncreased Channel Erosion
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ASCE Journal of HydraulicsASCE Journal of Hydraulics
Nov 1979 – “Downstream Effects of Stormwater Nov 1979 – “Downstream Effects of Stormwater Management Basins” – Richard McCuenManagement Basins” – Richard McCuen– It is recognized that the urbanization process is responsible for It is recognized that the urbanization process is responsible for
increases in both runoff flow rates and sediment volumes…. The increases in both runoff flow rates and sediment volumes…. The question that has led to much consideration is: Are SWM Basins question that has led to much consideration is: Are SWM Basins effectively meeting the intent of stormwater management?”effectively meeting the intent of stormwater management?”
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 1818
1983 - ACT 167 REVISED!1983 - ACT 167 REVISED! Enabled Watershed PlanningEnabled Watershed Planning
– plans revised every five yearsplans revised every five years– considers existing trouble areasconsiders existing trouble areas– usually developed by countyusually developed by county
Peak FlowsPeak Flows– limited to preconstruction levelslimited to preconstruction levels– limited by effect on Watershedlimited by effect on Watershed
Municipal Implementation Municipal Implementation
Low Impact Development and Stormwater Management in Pennsylvania
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1983 - FOCUS1983 - FOCUS
Peak Flows Peak Flows 2 ~ 100 Year Storms2 ~ 100 Year Storms Watershed Drainage SystemWatershed Drainage System
– Release RateRelease Rate
Low Impact Development and Stormwater Management in Pennsylvania
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1983 - RESULTS1983 - RESULTS Flow Collected and ConcentratedFlow Collected and Concentrated Bigger Detention BasinsBigger Detention Basins
– 2 ~ 100 year storms2 ~ 100 year storms– Release Rate ~ Watershed LocationRelease Rate ~ Watershed Location
OwnedOwned– Homeowners AssociationsHomeowners Associations– MunicipalMunicipal
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IssuesIssues
Low Impact Development and Stormwater Management in Pennsylvania
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Act 167 StatusAct 167 Status Dec 1999 - PaDEP Dec 1999 - PaDEP
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Low Impact Development and Stormwater Management in Pennsylvania
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Low Impact Development and Stormwater Management in Pennsylvania
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EPA Region III WebsiteEPA Region III Website
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ASCE Journal of HydraulicsASCE Journal of Hydraulics April 1980 – “Stormwater Detention in Developing April 1980 – “Stormwater Detention in Developing
Watersheds” – C Amandes, P. BedientWatersheds” – C Amandes, P. Bedient– Urban Stormwater runoff has become the major source of stream Urban Stormwater runoff has become the major source of stream
pollution in many urban areas as point source effluents have been pollution in many urban areas as point source effluents have been largely controlled through improved treatment.largely controlled through improved treatment.
July 1988 – “Multicriterion Stormwater Management July 1988 – “Multicriterion Stormwater Management Methods” – R. McCuen & G. MoglenMethods” – R. McCuen & G. Moglen– Both theory and experience indicate that, while detention basins Both theory and experience indicate that, while detention basins
designed to control peak discharge are effective in controlling the designed to control peak discharge are effective in controlling the peak rates, the basins are ineffective in in controlling the peak rates, the basins are ineffective in in controlling the degradatation of erodible channels downstream of the basin.degradatation of erodible channels downstream of the basin.
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Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 2727
What do we design for?What do we design for?
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1948-2001intervals - .25"
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The “old” way- directly connectedThe “old” way- directly connected
Roof
DrivewayStreet
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• Infiltration -- Decreased• Baseflow -- Decreased• Groundwater Recharge -- Decreased• Runoff Quality -- Decreased• Stream Bank Erosion -- Increased
•Runoff •Speed -- Increased•Peak Flows -- Increased•Volume -- Increased•No Chance to Infiltrate•No Pollutant Filtration
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 2929
Pa Comprehensive Stormwater PolicyPa Comprehensive Stormwater Policy Protect and maintain stream uses/water quality;Protect and maintain stream uses/water quality; Protect, maintain and sustain water quantity; and Protect, maintain and sustain water quantity; and Integrate federal stormwater management Integrate federal stormwater management
requirements. “requirements. “NPDES – II”” Best Management Practice (BMP) approach to Best Management Practice (BMP) approach to
stormwater management that emphasizes stormwater management that emphasizes groundwater recharge and the reduction of groundwater recharge and the reduction of impacts from discharges to surface water.impacts from discharges to surface water.
PaDEP Aug 2002
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3030
Comprehensive Stormwater Comprehensive Stormwater Management ProgramManagement Program
Pa SW Mgt SymposiumPa SW Mgt Symposium
Villanova UniversityVillanova University
October 16,2003October 16,2003
Durla Lathia, P.E.Durla Lathia, P.E.
Bureau of Watershed ManagementBureau of Watershed Management
Pa DEPPa DEP
The following slides are excerpts from a presentation Durla Lathia
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3131
DEP’s Initiative For Public Input DEP’s Initiative For Public Input for for New DirectionsNew Directions
15 Water Forums held in 200115 Water Forums held in 2001 Public Identified Stormwater Public Identified Stormwater
Management as a Consistent Issue, and Management as a Consistent Issue, and Wanted a Comprehensive Wanted a Comprehensive Implementation of Various Water Implementation of Various Water Management ProgramsManagement Programs
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3232
“…..to improve and sustain ground and surface water quality and quantity ……
Pennsylvania’s Comprehensive Stormwater Management Policy
GOAL:
September 2002
www.dep.state.pa.usDirect Link to “Stormwater”
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3333
Under what authority was the policy issued?Comprehensive SW Policy
Antidegradation Requirements
Section 93.4a
• Existing In-Stream Water Uses and the Level of Water Quality Necessary to Protect the Existing Uses Shall Be Maintained and Protected
•The Water Quality of High Quality & Exceptional Value Waters Shall Be
Maintained & Protected
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3434
Implementation GoalsImplementation Goals To successfully implement the To successfully implement the
Comprehensive Stormwater Comprehensive Stormwater Management Policy the goals Management Policy the goals must:must:
Be reasonably attainableBe reasonably attainable Target and prioritize major obstaclesTarget and prioritize major obstacles Be effectively implemented utilizing Be effectively implemented utilizing
existing resourcesexisting resources
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3535
Comprehensive Stormwater Comprehensive Stormwater Management ApproachManagement Approach
Integration of Planning, Technical and Integration of Planning, Technical and Regulatory Programs Regulatory Programs
Financial Incentives Financial Incentives Provide Necessary Technical Tools and Provide Necessary Technical Tools and
Support – BMP Tech ManualSupport – BMP Tech Manual
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3636
COMPREHENSIVESW
POLICY
Special Protection
Waters
NPDESConstruction
Permits
NPDESPhase II
MS4 Permits
ACT 167PlanningProgram
PaDEP Presentation – Pa SWM Symposium Oct 2003
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Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3737
NPDES Construction PermitsNPDES Construction Permits PPermits require protection of uses ermits require protection of uses
and maintenance of water qualityand maintenance of water quality– E/S Control Plan to minimize pollutants from E/S Control Plan to minimize pollutants from
earth disturbance activities. earth disturbance activities. – PPost ost CConstruction onstruction SSW W MMgt. Plangt. Plan
Permits now emphasize requirement for Permits now emphasize requirement for PCSM PlansPCSM Plans Identification, Assurance for Operation and Identification, Assurance for Operation and
Maintenance of BMPsMaintenance of BMPs
– Preparedness, Prevention, Contingency PlanPreparedness, Prevention, Contingency Plan
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3838
PCSM PLANS
Must Accompany Permit Application
Identifiy BMP’s
BMP’s MUST be Designed and Constructed in accordance with:
DEP Approved Act 167 SW Plan with Water Quality Requirements, if a Plan Exist,
Existing MS4 Municipal Ordinance, IF No Act 167 SW Plan,
A 2-Year - 24 Hour Runoff Volume Difference Management(Post - Pre Development Conditions), If neither Act 167 nor MS4 Municipal Ordinance exists.
A Long Term Maintenance of BMP’s is Required
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 3939
Act 167 Stormwater Planning ProgramAct 167 Stormwater Planning Program
Incorporates hydrologic and hydraulic Incorporates hydrologic and hydraulic Evaluation of a Watershed for Existing and Evaluation of a Watershed for Existing and Future Land Use Scenario Future Land Use Scenario
Requires County and Municipal participation Requires County and Municipal participation Considers Existing Local Regulatory ProgramsConsiders Existing Local Regulatory Programs Recommends Control of Stormwater Runoff Recommends Control of Stormwater Runoff
from Development Activitiesfrom Development Activities A Recommended Model Ordinance A Recommended Model Ordinance
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4040
NPDES Phase II MS4 ProgramNPDES Phase II MS4 Program ““MMunicipal unicipal SSeparate eparate SStorm torm SSewer ewer SSystem (MS4)”ystem (MS4)”
20 Urbanized Areas20 Urbanized Areas 929 municipalities, 30 counties, 14 potential municipalities, plus 929 municipalities, 30 counties, 14 potential municipalities, plus
state and federal institutions (PADOT, PTC, prisons, universities) state and federal institutions (PADOT, PTC, prisons, universities)
Permit Requires Implementation of Permit Requires Implementation of 6 Minimum Control Measures6 Minimum Control Measures– Public EducationPublic Education– Public Participation & InvolvementPublic Participation & Involvement– Illicit DischargesIllicit Discharges– ConstructionConstruction– Post-constructionPost-construction– Pollution Prevention/Good HousekeepingPollution Prevention/Good Housekeeping
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4141
NPDES II-MS4 PermitNPDES II-MS4 Permit For General Permits, MS4s have Two For General Permits, MS4s have Two
options:options:– Follow DEP “Follow DEP “SW MGT. PROTOCOLSW MGT. PROTOCOL””
““Pre-approved” Tasks Pre-approved” Tasks Relaxed deadlines for Multi-municipal Efforts, Relaxed deadlines for Multi-municipal Efforts,
Working on Watershed Based ApproachWorking on Watershed Based Approach Funding Opportunity, if Funding Opportunity, if Act 167 Planning is Act 167 Planning is
Involved Involved OrOr
– Develop own programDevelop own program Must get DEP approvalMust get DEP approval No fundingNo funding
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4242
Expanded Scope of Act 167 ProgramExpanded Scope of Act 167 Program
In addition to the requirements of the Section In addition to the requirements of the Section 5(b) of the Act, 5(b) of the Act, ALLALL Minimum Control Minimum Control Measures of the NPDES MS4 Permit Measures of the NPDES MS4 Permit requirements may be included in a SW Plan, if requirements may be included in a SW Plan, if Counties and Municipalities wish to do soCounties and Municipalities wish to do so
FundingFunding is also included for the expanded is also included for the expanded scope scope
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4343
Act 167 SW Management
Planning
Rate & Volume Control
Water Quality
NPDESMS4
Permit
Special Protection
Waters
InfiltrationGroundwater
Recharge
Tailored Municipal
Ordinances
NPDESConstruction
Permit
Financial Assistance
Technical Assistance
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4444
How Does Act 167 SW Planning How Does Act 167 SW Planning Implement Comp SW Policy???Implement Comp SW Policy???
Recommend Measures and Techniques to Recommend Measures and Techniques to Address Stormwater Runoff Impact with a Address Stormwater Runoff Impact with a Goal to Mimic Pre-Development Goal to Mimic Pre-Development Conditions after Development is Conditions after Development is Completed.Completed.
Control Standards for Quantity, Control Standards for Quantity, Quality,Groundwater Recharge and Quality,Groundwater Recharge and Stream ProtectionStream Protection
NPDES Regulatory Components IncludedNPDES Regulatory Components Included
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4545
Act 167 SW Planning StatusAct 167 SW Planning Status
85 Plans approved for 47 counties85 Plans approved for 47 counties Plans approved after Aug. 2001 contain WQ Plans approved after Aug. 2001 contain WQ
ComponentsComponents 777 Municipalities to enact and implement 777 Municipalities to enact and implement
ordinancesordinances 42 additional Plans currently under way (42 additional Plans currently under way (23 23
Counties, 603 Municipalities): All Plans have WQ ComponentsCounties, 603 Municipalities): All Plans have WQ Components
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4646
STORMWATER ORDINANCESTORMWATER ORDINANCE
MS4 Ordinance(MS4 Ordinance(available on DEP Websiteavailable on DEP Website) )
A General SW Ordinance which includes A General SW Ordinance which includes all the components of Stormwater all the components of Stormwater Management. Counties include this Management. Counties include this ordinance in their SW Plans, subject to ordinance in their SW Plans, subject to watershed specific modifications. watershed specific modifications. Municipalities, not part of a SW Plan, are Municipalities, not part of a SW Plan, are encouraged to consider adoption encouraged to consider adoption
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4747
Pa BMP Technical ManualPa BMP Technical Manual
Tech Manual to Provide Computational Tech Manual to Provide Computational Procedures and Specifications- Procedures and Specifications- It will NOT Be a It will NOT Be a Regulatory HandbookRegulatory Handbook
18 Month Project18 Month Project Consultant Has Been SelectedConsultant Has Been Selected Oversight Committee Members AppointedOversight Committee Members Appointed First Oversight Committee Meeting Held on First Oversight Committee Meeting Held on
October 10, 2003October 10, 2003 DEP Contacts: Dennis Stum/Ken ReisingerDEP Contacts: Dennis Stum/Ken Reisinger
PaDEP Presentation – Pa SWM Symposium Oct 2003
Low Impact Development and Stormwater Management in Pennsylvania
Villanova Urban Stormwater Partnership – www.villanova.edu/VUSP II II 4848
Stormwater ManagementStormwater ManagementHow Can We Help How Can We Help ????
Central OfficeCentral Office
Regional OfficesRegional Offices
WWW.DEP.STATE.PA.US
Direct Link to Direct Link to “Stormwater”“Stormwater”
PaDEP Presentation – Pa SWM Symposium Oct 2003