Safety first.
I'd go along with using the flag if there were swimmers in the water. Also, a swim line is a good idea. You're supposed to have a permit for them but most of the people I know that use them have never botherred. They are expensive if you only use the styrofoam bulbs but I've seen several other materials used like playground balls with netting. One thing that scared me was the propane tanks that used to bob a mile north of the Alton bandstand.
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