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RS2025-1167 - Stormwater Regulations Questions

This discussion topic was requested by Council Member Quin Evans Segall regarding Resolution No. RS2025-1167, a resolution requesting the Metropolitan Department of Water and Sewerage Services make revisions to the Stormwater Management Manual to address stormwater drainage across Nashville and Davidson County by updating the infill tree credit and including multi-family structures as residential infill.

From CM Evans Segall: 

I have sent the following questions to Stormwater in order related to RS2025-1167. I will post the responses from them once they are received. 

The way I understand the code is as follows:

  1. The requirements of 15.64.131 (residential infill) only apply if the requirements of 15.64.110 (all other storm water and grading not otherwise exempt) do not apply.
  2. The statute defines "residential" as one and two family.
  3. Therefore, a 3 unit building would never be considered residential.
  4. If 1 and 2 are correct, then a 3 unit building would never qualify for "residential" infill under 15.64.110 and thus should never be governed by 15.64.131.
    1. Instead, a 3 unit building would always be governed by 15.64.110 (unless it meets one of the other exceptions listed therein).
  5. 15.64.110 requires a grading permit so 3 unit buildings are always required to get grading permits.

Is this understanding incorrect?

15.64.110 also seems stricter than 15.64.131, but please let me know if that is incorrect?

Finally, have we looked at whether we can address the issue of people sort of gaming the system by adding impervious surface post closing? I hear a lot about this, as you might imagine!