I have perimeter drain tile surrounding my house which is connected to a drain pipe that daylights down a hill approximately 60 feet or so from my home. Recently I recognized my sump pump was running much more often than normal and especially so after heavy rains. Upon investigating, I discovered water flow out the end of the drain pipe was non-existent and this appeared to have been the case for some time.
I have ruled out clogging or collapse of the 4" plastic drain pipe and my next step is to check the integrity of the connection between the drain tile and drain pipe (where the drain tile "tees" into the drain pipe).
Does it stand to reason that if a portion of my perimeter drain had collapsed or become clogged that some water would still find its way down the drain pipe?
I realize if I discover the connection between the drain tile and drain pipe is intact that the issue must lie within the perimeter drain, but I am struggling to visualize-- short of a catastrophic failure of the perimeter drain on either side of that connection-- why some water would not still making its way down the drain pipe assuming the connection was ok?
I would also appreciate some help understanding how water flows within a perimeter drain and what the net result might be if a portion of the drain tile either collapsed, broke, or became clogged.
Thanks,
--Howie