Asset Management: Integrating Risk into Stormwater Planning€¦ · · 2016-05-12Asset Management: Integrating Risk into Stormwater Planning ACWA May 11, 2016 ... Goals for presentation

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


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


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



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


Voters rejected privatization of Water and Sewer Bureaus

Asset life cycle management

Plan

Design

Construct and

commission

Operate and

monitorMaintain

and repair

Evaluate

performance


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


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.


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


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


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)


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?


Stormwater System Planning

INPUTS

OUTCOMES


Overview

• Portland has three systems for managing stormwater

Stormwater system


OverviewStormwater system assets

300 Miles Streams and

Rivers

Acres Natural Areas, Tree Canopy

10,000Private

Property Facilities


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


How will SWSP work?


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?


ARC

L-SLIDE

NU.FLD

WQ

HAB

SAN

TAXLOTS

STREETS

STREAMS

UTILITIES

HYDROLOGY


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


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


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


• Lost property tax revenue

• Street improvement deferred and more costly.


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;


• Damaged or destroyed structures, roads, infrastructure, streams.

William J. Burns, Kate Mickelson, and Ian P. Madin, Oregon Dept. of Geology & Mineral Industries


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.


• Damage to private and public structures, roads, infrastructure, risk claims


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


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


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)


How will SWSP work?


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?


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


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


Questions

Answers

Documents

Asset Management: Integrating Risk into Stormwater Planning€¦ · · 2016-05-12Asset Management: Integrating Risk into Stormwater Planning ACWA May 11, 2016 ... Goals for presentation