water pump?
Using your boat to dredge can add sand etc to the cooling system where it becomes lodged. As flow through the system is impeded, you can overheat and cause long term problems. My old marina slip was in an area where there was considerable milfoil. Over time, the strainers would clog with chewed up weeds and the engine would overheat. Cleaning the strainers was an easy project, but less fun when it was unexpected and the engine was hot to work on. I have two engines, so I cold get home on one, but no fun and perhaps some $$ if I had to get a tow.
Leaf removal with a rake may not be a problem, but I believe DES frowns on blowing sand and silt around. Certainly don't want to disturb fish breeding/nesting sites.
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