Folks,
Recently, the TOAG has reviewed some information from the SSWWEP and the City's Stormwater Model Calibration Project, and issued a couple of memos based on their review. I thought that these were important memos from the TOAG that you should be aware of. Two memos are attached and outlined below.
1. The TOAG's response to the Stormwater Model Calibration Tech Memo. Amongst other things, this memo outlines the TOAG's conclusions that:
- The City's stormwater model is an appropriate tool for use in assessing the response of the City’s Storm Sewer System.
- Additional flow in Storm Sewers which is being generated by the FDD program is relatively minor, with most storm sewers experiencing flow increases on the order of 2% or less of the pipe capacity.
- The FDD program has NOT had a significant adverse impact on the Storm Sewer System as a whole.
- There may be a few small, isolated areas where the flows attributable to the FDD program are more significant, and these subareas may warrant further review and analysis.
2. The TOAG's review of the climate change methodology used to evaluate risk for the SSWWEP. Amongst other things, this memo outlines the TOAG's conclusions that:
- The methodology used to assess impacts of climate change seems appropriate and standard.
- The methodology used is relatively standard and is similar to other stormwater assessments that have been conducted.
- The other Wet Weather studies being undertaken by Ann Arbor should similarly acknowledge and recognize the importance of climate change as a factor which affects the City’s infrastructure.
Please review the memos and let us know if you have any questions or comments.
Take care,
Robert
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