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Commission discusses stormwater manual changes: crossings, variance criteria and a 6–12 month revision window
Summary
Commissioners, Metro Water staff and legal counsel discussed planned changes to the stormwater manual and code language, including studying the 1,000-foot crossing rule for greenways, clarifying variance criteria for pre-existing development and a likely 6–12 month timeframe tied to the MS4 permit reissuance for larger revisions.
Stormwater commissioners and Metro Water staff spent substantial time discussing possible edits to the stormwater manual and code language, with three recurring themes: the 1,000-foot crossing rule for stream buffers, variance criteria for pre-existing development, and the timing and process for manual revisions.
Staff said the 1,000-foot crossing spacing was originally drafted to limit vehicular crossings and reduce disturbances that let pollution reach streams; staff noted the standard does not clearly distinguish pedestrian versus vehicular crossings and that the commission has flagged the policy for study. Commissioners and staff agreed the manual should clarify whether the limit applies to pedestrian greenways and whether some greenway crossings should be approvable at staff level rather than by a variance.
Commissioner discussion also focused on variance criteria, specifically the “exceptional hardship” standard. One commissioner proposed a narrow carve-out modeled on the existing exception for National Register properties: where structures predate buffer rules, the commission could adopt a narrowly tailored path that still requires a finding that overall stormwater quality will be improved. Staff and Metro Legal said they would review any suggested language and work with legal counsel on drafting options.
Staff outlined the change-management timeline: smaller manual edits that do not significantly affect development could be routed through the mayor’s office and implemented more quickly; larger changes that affect the development community would follow the formal manual revision process and public review. Metro staff estimated a 6‑ to 12‑month window to pursue a broader revision tied to reissuance of the city’s MPDES MS4 permit, though they said the final scope is not yet determined.
Stormwater staff urged commissioners to submit concrete examples of unclear or recurring cases (for instance, repeated greenway crossing variances) to Rebecca Pryce so staff can prioritize changes to Table 6.3 and other provisions. Staff repeatedly cautioned that FEMA, state and federal requirements and unintended regulatory interactions complicate any rewrite and that careful drafting is required to avoid creating downstream problems.
Commissioners agreed to provide targeted suggestions and flagged the pre-existing-structure issue as an item to pursue with staff and legal counsel.
