Soo...i dug my pond deeper and wider and put underlayment down and then the rubber liner then it rained...alot, and then water got under liner and the bottom of liner floated to the top of the water level....the pond is on a slight hill and i get run off from the neighbors property but this never happened when i had the cheaper type liner that came from Lowes, if you know the type I'm talking about..so, any suggestions of what to do about this? very aggravating ...thanx!