Quote:
Originally Posted by Topspinmo
Yes there are lots of many man made washouts (rotted drainages pipes which have static pressure form water weight in the pond are man made which saturate underground till it reaches cavity and collapse) that natural sinkholes are scapegoated  all my opinion of course? And I can have an opinion 
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I don't think PVC pipe rots. PVC has been used in Florida since 1975.