point to point microwave link sounds like the bottom part of the fresnel zone was scraping the water - bad engineering design from the outset, tides or no tides

point to point microwave link sounds like the bottom part of the fresnel zone was scraping the water - bad engineering design from the outset, tides or no tides. Not a good idea to do unless you have absolutely no economical way of getting one or both ends of the link higher.