Hennepin County

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PROJECT QUESTION: Can al alternate shape be provided for this project?

Question:
Can an alternate shape be provided for this project?

Response:
Notes pertaining to a modification in the shape and size of the bridge are identified in Addendum 1 (this information supplements Division SB, specifically section SB-8: PRECAST CONCRETE SECTIONS). These requirements are critical to receiving the watershed permit. This addendum was issued to identify additional hydraulic characteristics for this culvert/bridge.

An alternate shape will need to be supplemented with hydraulic calculations to verify the conditions of the Bassett Creek Watershed Management Commission are met. The shape needs to meet the requirements noted in Addendum 1 for no rise upstream or downstream during the 100-year storm event. The proposed design must meet this requirement, and cannot simply match or exceed the open area of the existing bridge.