Quote:
Originally Posted by VApeople
I have no idea if it harmful to just leave it alone.
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What happens is that the outlet is blocked and so the water backs up and spills out at the joint between the downspout and underground pipe. It defeats the purpose of the underground pipe. You should check the grate every few months, otherwise it is hard to find. I had to use a hose to put water into the joint and it took quite a bit of searching before I found a wet spot in the yard and then found the buried grate.