The applicant shall submit a hydraulic capacity report that includes drainage calculations and a narrative to demonstrate that the proposed stream crossing has sufficient hydraulic capacity to meet the applicable design standard with any application for:

1. (a) A new tier 3 or tier 4 stream crossing for which an alternative design is being submitted pursuant to Env-Wt 904.10; or
2. (b) A replacement tier 3 or tier 4 stream crossing for which the existing stream crossing cannot accommodate the design storm flow.

Source. #12809, eff 12-15-19