Enhancing transportation project delivery through watershed characterization
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Enhancing Transportation Project Delivery Through Watershed Characterization. Richard Gersib Watershed Program Manager Washington State Department of Transportation. Robert Bailey wrote:.

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Enhancing Transportation Project Delivery Through Watershed Characterization

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Enhancing transportation project delivery through watershed characterization

Enhancing Transportation Project Delivery Through Watershed Characterization

Richard Gersib

Watershed Program Manager

Washington State Department of Transportation


Robert bailey wrote

Robert Bailey wrote:

“A spider web is analogous to an ecosystem. When the web is disturbed at one spot, other strands of the web are affected because of linkages.”

Disturbance

Source: Ecosystem Geography 1996 Springer-Verlag, New York


Enhancing transportation project delivery through watershed characterization

Increase Environmental Benefit

Reduce Cost

  • Assess project impacts (site)

  • Avoid/minimize impacts (site/landscape)

  • Assess condition of ecological processes (landscape)

  • Maximize benefits by identifying areas capable of matching #1 and #3 (landscape/site)

  • Target sites maximizing long-term environmental benefits (landscape)

  • Tell the story(site/landscape)


Enhancing transportation project delivery through watershed characterization

Mitigate project impacts, first and foremost

Focus on landscape recovery and ecosystem health


Target mitigation for maximum benefits

Target mitigation for maximum benefits

Target landscape, not artificial, storage and treatment

Engineered Flow Control

Example, stormwater detention pond

No benefits beyond water quality/quantity

Restoring Natural Control

Example: wetlands restoration

Many benefits beyond just water quality/quantity


Enhancing transportation project delivery through watershed characterization

Target mitigation where it’s most effective

<5% TIA

100%

5-10% TIA

>20% TIA

Environmental Function

Forested

Rural Residential

Suburban Residential

Urban

10

20

30

40

50

60

Total Impervious Area (TIA, %)


At landscape scales focus on ecological processes

At Landscape Scales,Focus on Ecological Processes

Movement

of Sediment

Movement

of Large Wood

Movement

of Water

Movement

of Nutrients, Bacteria,

Toxicants

Movement

of Heat


Enhancing transportation project delivery through watershed characterization

Characterize Condition of

Target Ecological Processes

Target Key Areas for Recovery

Translate landscape processes back to site functions

Translate site functions to landscape processes

Watershed-scale

Site-scale

=

Assess project impacts

type, area, function

Assess mitigation potential

type, area, function


I 405 north renton study area

I-405 North Renton Study Area


Establish spatial scales for analysis and mitigation

Establish Spatial Scales for Analysis and Mitigation

Interstate 405, North Renton


Establish temporal scales

Establish Temporal Scales

2020 Buildout

Assess multiple temporal scales

Current

Pre-Development


Characterize condition of study area

CharacterizeCondition of Study Area

  • Water

  • Sediment

  • Pollutants

  • Wood

  • Heat

  • Aquatic Integrity

  • Upland Integrity


Develop potential wetland restoration site database

Develop Potential Wetland Restoration Site Database


Develop potential riparian restoration site database

Potential riparian area

Not a potential riparian area

Develop Potential Riparian Restoration Site Database


Develop potential floodplain restoration site database

Develop Potential Floodplain Restoration Site Database

Potential floodplain mitigation area

Not a potential floodplain restoration area


Develop potential stormwater retrofit site database

Develop Potential Stormwater Retrofit Site Database


May creek site locations

May Creek Site Locations


Enhancing transportation project delivery through watershed characterization

“We are confronted by insurmountable [email protected]://www.wsdot.wa.gov/environment/watershed/technical_report.htm


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