asset management: integrating risk into stormwater planning€¦ · · 2016-05-12asset...
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Environmental Services l Stormwater System Plan Update | May 11, 2016 1
Asset Management: Integrating Risk into Stormwater Planning
ACWAMay 11, 2016
Dawn Uchiyama, Kristen Acock
Environmental Services l Stormwater System Plan Update | May 11, 2016 2
1990OMSI Parking lot retrofit
1993Downspout Disconnection Program
1999First Stormwater Management Manual
1999First commercial ecoroof
City of Portland | Key Milestones
1991Legal Order to control CSOs
1994AFSO that required 96% CSO reduction
1998Steelhead and Coho Salmon listed as Threatened Species
1995Regional Parks Bond Measure
1977Clean Water Act and first stormwater fee
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2000 CleanRiver Plan
2003First Green Street at NE Siskiyou & first partnership with Portland Public Schools
2005Watershed Management Plan
2006Clean River Rewards incentive
2002Demonstration projects for private property
City of Portland | Key Milestones
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2012 Stephens Creek Stormwater System Plan
2009Launched Asset Management Program
2011CSO Program Complete
2007Launched Tabor to the RiverProgram
2008Completed Tryon Headwaters Project
Launched Grey to GreenInitiative
2014Citywide Stormwater SystemRisk Assessment
City of Portland | Key Milestones
Voters rejected privatization of Water and Sewer Bureaus
Asset life cycle management
Plan
Design
Construct and
commission
Operate and
monitorMaintain
and repair
Evaluate
performance
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Infrastructure Asset Management
The goal of infrastructure asset management isto meet a required level of service, in the most cost effective manner, through the management of assets for present and future customers.
-International Infrastructure Management Manual
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Asset Management - Risk
• Risk events are events which may compromise the delivery of the organization's strategic objectives.
• We measure risk by assessing the likelihood and consequence.
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SAN
ITA
RY • CAPACITY
• CONDITION
CO
MB
INED
• CAPACITY
• CONDITION
STO
RM • WATER QUAILITY/
SEDIMENT
• CONVEYANCE
• HYDROLOGY
• EROSION/LANDSLIDES
• FLOODING
• HABITAT
• SANITARY OVERFLOWS
BES System Levels of Service
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Commitment to Asset Management
Implement Projects and
Programs
Maintain, Monitor and Evaluate
Plan and Policy
Development
Risk management framework
Shared language for prioritization
Cycle of continuous improvement
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Goals for presentation
• Share how we’re applying asset management to stormwater, including some of the challenges.
• Levels of Service
• Risk Assessment
• Approach for Recommendations
• Stormwater System Plan (SWSP)
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What is SWSP?
• Citywide stormwater CONTEXT
• Delivers a PLAN
• Provides a FRAMEWORK
• Performs RISK-BASED analysis
How will we do SWSP?
• At multiple SCALES
• By ADAPTING prior approaches
• Following an ITERATIVE process
• INTEGRATING science and data
• Through COLLABORATION
Why are we doing SWSP?
• Ratepayers want TRANSPARENCY
• We want to preserve EQUITY
• There’s a CRITICAL need to address risks
What, Why, How?
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Stormwater System Planning
INPUTS
OUTCOMES
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Overview
• Portland has three systems for managing stormwater
Stormwater system
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OverviewStormwater system assets
300 Miles Streams and
Rivers
Acres Natural Areas, Tree Canopy
10,000Private
Property Facilities
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How will SWSP work?
Capital Improvements
PAWMAP
Project monitoring
Best Available
Data
Programs and Practices
Policy Recommendations
Early Action
Projects
INPUTS
OUTCOMES
DataRecommends
SWMM Feedback
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Strategic Commitments
Stormwater is managed to meet
regulations in a watershed context to
achieve:
Service Categories
What we manage to reduce risk & improve conditions:
Protection of public health and property
and improvement of public safety
Sanitary sewage releases
Erosion and landslide hazards
Localized/nuisance flooding
Groundwater contamination
Protection of biological communities
and improvement of ecological function
Loss of habitat
Contamination of surface water and
sediment
Disruption to hydrologic cycle
Support of community needs Deficiencies that impede community
improvements
WQ
ARC
HAB
HYD
SEW
LAND
FLD
GW
How will SWSP work?
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ARC
L-SLIDE
NU.FLD
WQ
HAB
SAN
TAXLOTS
STREETS
STREAMS
UTILITIES
HYDROLOGY
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Rapid Risk Assessment – Draft Risk RegistryFailure Event Likelihood (Function of:)
ConsequenceDollars based on impact to property, ROW, infrastructure, stream system, tax revenue
Relative score: impact to receiving water
Stream erosion due to increased flows from human-made development
Difference between pre-/post-development runoff; erosive susceptibility of channel
Exposure of sewer infrastructure in channels, damage to structure or road supported by stream bank
Impeded community development due to inadequate or absent storm system
Development/redevelopment potential; lack of stormwater collection and conveyance system.
Lost property tax revenue (reduced development potential), street frontage improvement deferred, street improvements more costly.
Landslide due to inadequate or absent storm system
Landslide susceptibility; lack of stormwater collection and conveyance system.
Damaged or destroyed structures, roads, infrastructure, streams.
Nuisance ponding and/or flooding due to inadequate or absent storm system
High stormwater runoff potential; lack of stormwater collection and conveyance system; topographic depressions; known or reported drainage problems.
Private and public structures, roads, infrastructure damaged, risk claims.
Habitat degradation due to human-made development
Existing conditions: riparian vegetation, wood volume, % artificial bank stabilization, stream erosion, % streams piped, % streams accessible
Degradation of functions in surface waters of varying sensitivities
Contamination of surface and groundwater due to leaking sanitary or combined pipes and on-site septic systems
Sanitary pipe or septic system condition and proximity to stream
Degradation of water quality in surface waters of varying sensitivities
Contamination of surface and groundwater due to human-made development
Land use and associated pollutant load concentrations, runoff coefficient
Degradation of water quality in surface waters of varying sensitivities
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Disruption of the Hydrologic Cycle
• Stream erosion due to increased flows from human-made development
• Likelihood• Increased runoff potential, reduced vegetation in
uplands
• Stream susceptibility – NRCS soil erosion classifications
• Consequence• In dollars
• Exposure of sewer infrastructure in channels, damage to structure or road supported by stream bank
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Deficiencies That Impede Community Development
Impeded community development due to inadequate or absent storm system
• Likelihood• Lack of access to an approvable route of stormwater
conveyance (ARC) e.g. stream, pipe, ditch
• Development/redevelopment potential and street improvements
• Consequence• In dollars
• Lost property tax revenue
• Street improvement deferred and more costly.
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Landslide Risk
Landslide due to inadequate or absent storm system
• Likelihood • DOGAMI landslide susceptibility model based on
soils, geology, and landslide history (March 2016)
• Lack of stormwater collection and conveyance system;
• Consequence• In dollars
• Damaged or destroyed structures, roads, infrastructure, streams.
William J. Burns, Kate Mickelson, and Ian P. Madin, Oregon Dept. of Geology & Mineral Industries
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Localized & Nuisance Flooding
Private property and public safety is impacted by localized and nuisance flooding, i.e. non-riverine flooding from frequent storm events
• Likelihood• High stormwater runoff potential
• Lack of stormwater collection and conveyance system
• Topographic depressions
• Known or reported drainage problems.
• Consequence• In dollars
• Damage to private and public structures, roads, infrastructure, risk claims
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Habitat Degradation
Riparian habitat degradation due to human-made development
• Likelihood based on condition as measured by:• Riparian vegetation cover
• Wood volume
• Artificial bank stabilization
• Stream erosion (source: hydrologic alteration)
• % streams pipe and accessibility
• Consequence• Relative scale (not in dollars)
• Degradation of functions in surface waters of varying sensitivities
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Sanitary Sewage Releases
Leaking sewer pipes and site septic systems may pose water quality risk to water surface and groundwater.
• Likelihood • Sewer pipe condition assessment
• Sewer pipe or septic tank location in proximity to streams
• Data sources including sewer pipe condition assessment data, existing city RDII studies, on going Citywide Sewer Extension Plan and city in-stream E. Coli water quality data.
• Consequences • Relative scale (not in dollars)
• Degradation of water quality in surface waters of varying sensitivities
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Water Quality
Contamination of surface water, groundwater, or sediment due to human-made development
• Likelihood• Representative pollutants of concern: total suspended solids, total copper, PCBs
• Land uses: Heavy and Light Industrial, High Traffic Roadways, Commercial, Residential, Open Space
• Consequence scores were assigned relative to an asset’s susceptibility to pollutants• Relative scale (not in dollars)
• Based on impact to receiving water (e.g., pipe to WWTP vs. stream)
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GIS Analysis
- Where stormwater flows – track risk
- Presence / absence of SW system
Asset Management
- Asset inventory & Conditions assessment
- Risk assessment
- Alternatives evaluation
- Business case
Social
- Equity
- Political interest
How will SWSP work?
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SWSP Planning Process
• Hi-risk priority areas
• City Wide Policy
City Wide Risk Screen
• Concept Design
• Recommendations CIP Operating Non Operating
Basin/District Plans • On the ground
improvements
• Clear design direction set in adequate context
Site Design
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Current schedule
• Rapid Risk Assessment = September 2016• Risk Assessments on all 8 service categories
• Best available data
• GIS tool to evaluate, map and track risk
• Recommendations
• Iterative – future schedule TBD • Regular products, reporting