Prepping the Camper - FLOOD......

My husband decided to start prepping the camper since it was such a nice day.  Not sure exactly what he did as I wasn't around, but he needed to add water to the camper or something??  Since it was his first time, he set it up and then started to work on the yard doing things.  He didn't realize how quickly it would fill because when he went back to the camper, it was flooded!!!  Not too bad, it was cleaned up by the time I returned home....good thing!!  Everything was dry and he learned his first big lesson of the season.