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SESSION: RESILIENT INFRASTRUCTURE. A Risk-Based Approach to Resiliency in a Post-Sandy Era. Ayesha Dolasa, P.E., LEEP AP BD+C, Program Manager for BEM Systems, Inc.

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SESSION: RESILIENT INFRASTRUCTURE


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SESSION: RESILIENT INFRASTRUCTURE

A Risk-Based Approach to Resiliency in a Post-Sandy Era

Ayesha Dolasa, P.E., LEEP AP BD+C, Program Manager for BEM Systems, Inc

In the aftermath of Superstorm Sandy, NJ TRANSIT developed a resiliency framework to assess the risk of assets to severe weather impacts. This risk-based approach consists of a semi-quantitative approach to evaluate (i) the criticality of assets based on several criteria and (ii) the vulnerability of assets to impacts such as fluvial flooding, storm surge, high heat, and high wind.

Ayesha Dolasa, P.E., LEEP AP BD+C, is an environmental engineer with 15 years of consulting experience providing environmental services. Post-Sandy, she has been working with NJ TRANSIT to develop a long-term sustainability and resiliency plan. In addition, she has been involved with project to evaluate the effects of sea level rise and develop flood mapping tools. Ms. Dolasa serves as a Program Manager for BEM Systems, Inc., an employee-owned consulting engineering and information management firm providing comprehensive environmental services to federal, state, and local government agencies.

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A Risk-Based Approach to Resiliency in a Post-Sandy Era

_______________________________________________

TRB Resiliency Panel

June 17, 2014

Presented by:

Ayesha Dolasa, PE, LEED AP

sparta mississippi
Sparta Mississippi

What is Resiliency?

“Resiliency is not a single outcome. It is a cradle-to-grave process…

… to meet three high-level performance criteria: efficiency, sustainability, and survivability.”

Volpe (June 2013)

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Developing an approach to determine resiliency by:

  • assessing the risk of assets to severe weather impacts and
  • prioritizing capital spending
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Risk-Based Approach

Federal guidance (FTA, FHWA, Volpe) was used to develop a semi-quantitative risk-based approach

  • Criticality: how important is an asset to the system
  • Vulnerability: the degree to which an asset is susceptible to and unable to cope with a severe weather impact

RISK = CRITICALITY X VULNERABILITY

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Criticality Assessment

  • Enables focus on the most important assets
  • Captures institutional knowledge
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Example Criticality Criteria 1 Total Passengers Serviced/Ridership

  • 3 = number of passengers above 10,000 per day
  • 2 = number of passengers between 4,000 and 10,000 per day
  • 1 = number of passengers below 4,000 per day
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Example Criticality Criteria 2

Time to Repair/Replace

  • 3= Duration is long term – 1 week or more
  • 2 = Duration is medium term – more than 24 hours
  • 1 = Duration is short term – less than 24 hours

Parts not manufactured - replace system

train stop
Train Stop

Asset X scores maximum 75/75

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Vulnerability Assessment

Vulnerability is a function of:

  • Exposure
  • Sensitivity
  • Adaptive Capacity

RISK = CRITICALITY X VULNERABILITY

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Sensitivity: Extent of damage to the asset or negative effect caused by extreme weather

Adaptive Capacity:Ability of the asset to be protected from a severe weather impacts

fema flood maps
FEMA Flood Maps

Vulnerability Score – Asset X

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Lessons Learned

  • Apply a logical risk-based approach to prioritize assets and help decision-makers focus the resiliency investments.
  • Every transportation system is different – not one size fits all.
  • It is important to work with personnel with experience to discuss vulnerabilities and asset importance.
  • All climate predictions, by nature, are uncertain to varying probabilistic degrees.