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City of Ann Arbor SSWWEP - Citizens Advisory Committee Coordination — City of Ann Arbor

1.28 -C- Are you taking into account long-term weather forecasts (climate change)?

Posted by Lori Byron on 20 Dec, 2013
Category: Category 1 - SSWWEP Questions and Presentations

Frank Burdick’s Log Number: N/A
Submitted by: April Public meeting, August CAC meeting
Category (1,2,3): 1
Status: Closed
Estimated date to address: N/A

Q. 1.28 April Public meeting – The March 15, 2012 rain in the Lawton area was a very significant event. Are climate change and large rain events going to be considered in your process?

Q. 1.28 CAC August meeting - Are you taking into account long-term weather forecasts (climate change)?
A. Quantifying the impacts of climate change on long-term weather is a very complex technical issue. This item can be addressed by the CAC during the alternatives evaluation phase of the project. For example, the CAC can consider the cost versus the risk of failure (i.e. a larger storm overwhelming the system), where the risk includes an allowance for larger rainfalls as a result of climate change. We are reviewing the most up-to-date rainfall statistics and will consider these when making recommendations.
 
Large rain events produce very valuable data for a study like this and will be evaluated in this process. It is difficult to forecast the impacts of climate change on rainfall patterns. This study does not include a specific task to address climate change as part of the measurement. 
However, there is a phase of the study called “alternatives evaluation” where the project team will gather and evaluate different approaches to manage wet weather flows to the sanitary sewer system. During this alternatives evaluation phase, the project team, together with the Citizens Advisory Committee, will have the opportunity to consider the impacts of climate change when setting the future level of service for the system through the risk-based design approach. This item can be taken up by the Citizens Advisory Committee working with the subject matter experts in the Technical Oversight Advisory Group. 

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