So in addition to the Boardman River watershed above Cass-Hartman-Hammond, the additive watershed below this site will send additional water to South Airport Road.
New 100-year flood flows, using current studies, will indicate what kind of structure would provide a safe design at the Cass-Hartman-Hammond site. Since these new studies will show that there is less water flowing at this site than at South Airport Road, it might even be determined that three smaller culverts or two culverts of a different diameter might provide a safe design.
So if I’m wrong and updated studies by hydrologists and engineers, using the latest research and design criteria, determined that a bridge at the proposed Cass-Hartman-Hammond is necessary, then a bridge would also be needed at South Airport Road.
About the author: Frank Lahde holds a degree in civil engineering and earned a Profesional Engineering License. He was an officer in the U.S. Army Corps of Engineers for more than eight years before resigning his commission as a Major. Most of his working career was with Ford Motor Company. He has lived in Grand Traverse County since 2004. Twice a year for the past five years he has assisted the Boardman River Clean Sweep organization in the removal of river debris. By email: firstname.lastname@example.org.
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