BCC was retained by Halley Engineering Contractors, Inc. to replace the proposed C-2 bridge over the Snapper Creek Extension Canal (C-2 canal) with an 18-foot diameter structural plate culvert, as part of an Alternative Technical Concept (ATC) to reduce the construction cost and reduce impact to traffic. As part of this project, BCC developed a HEC-RAS model of the C-2 Canal from NW 12th Street to NW 25th Street. The results of the C-4 Canal Basin XP-SWMM model developed by Miami-Dade County was used to establish the HEC-RAS model boundary flow and stages for the 5-, 10-, 25-, 100- and 500-year design storm events.
The HEC-RAS model was used to establish peak stages with the proposed C-2 bridge and 18-foot culvert to demonstrate to the Florida Turnpike and Miami-Dade County the 18-foot culvert provided the same hydraulic capacity without impacting the C-2 Canal upstream elevations. The modeling results were then used to prepare the design plans and modify the existing South Florida Water Management District (SFWMD) environmental resources permit (ERP), Army Corp of Engineers (ACOE) 404 permit, and Miami-Dade County Class III permit.