1

Performance-Driven Stormwater Programs

Lake Tahoe Example Chad Praul, Peter Kraatz & Jeremy Sokulsky

APPROACH

2

Incentives

Financial

Informational

Regulatory

Behavior =

Decisions & Actions

Environmental

Outcomes

Register

Set Expectations

Once per lifetime of infrastructure

Inspect Actual Conditions

Annually

URBAN STORMWATER CREDITING PROCESS & TOOLS

Cre

dit

s

KEY PRINCIPLES

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Share the Theory of Change Select Metrics & Credit

Success

Structure Reporting &

Adaptation

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Understand the “Why”

SHARE THEORY OF CHANGE

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Motivate Effective Action

Select Metrics & Credit Success

0

500

1000

1500

2000

2500

2016 2021 2026 *** 2076

# o

f C

red

its

Year

Placer County Milestones

• Aspirational but achievable targets motivate action

• Focus on metrics with quantity & quality

Clarity Challenge

Standard

Attainment

• Interim milestones address long timeframe issues

NON-MS4 SOURCE TRACKING METRICS

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Acres of Disturbed Area Restored or

Enhanced

Miles of Roads Created

Miles of Roads Inspected & Maintained

Parcels With Stormwater Retrofits

Linear Feet of Stream Channel

Restored or Enhanced

Lake Clarity Credits

POLLUTANT LOAD REDUCTION MODEL

(PLRM)

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MODEL STRUCTURE MODEL STAGES

WHAT IS BEING MODELED?

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FOR URBAN RUNOFF

IN KINGS BEACH, PLACER COUNTY

EXAMPLE – TREATMENT BMP

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Stay Relevant , Learn Fast & Use Tools

STRUCTURE REPORTING & ADAPTATION

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Annual

Reports

Credit

Accounting

Platform

TMDL Online

Interface

Rapid

Assessment

Methods

CREDIT ACCOUNTING PLATFORM

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http://www.tahoeroadram.com/cap/Login/login.php

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Rapid Assessment Methods (RAMs) Tahoe Road RAM www.tahoeroadram.com

Tahoe BMP RAM www.tahoebmpram.com

Secchi Depth

Performance Metric Sediment load reduced

0

5

10

15

20

2010 2011 2012 2013

What do we want? What are we doing about it? How are we doing?

Urban sediment source control Clarity loss is slowing

Outcome Metric

Restore lake clarity

(Beneficial Use: non-contact recreation)

ANNUAL REPORT DOCUMENT

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TMDL Online Interface https://www.enviroaccounting.com/TahoeTMDL/Program/Home

Quickly and cost-effectively create

and customize a website

Stakeholder engagement point

Report accomplishments

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• Link modeling assumptions

to observable metrics

• Respect & focus practitioner

judgement

• Metrics need quantity and

quality aspects