Based on the description I have a hunch the CG in question might be Old Mill Stream CG next to Dutch Wonderland.   We stayed there many years ago (back in the pop-up days.....).  Had a nice stay but we had heavy rain the final night and awoke to find the creek rising quickly.   If this is indeed the CG in question then this is nothing new to them.  While I understand them trying to protect their revenue, all they will earn in the long run is ill will if they continue to refuse refunds to those who can't get in to their site due to a recurring and KNOWN problem.