Water is the main enemy of your house. We don't want roofs to leak, concrete blocks to efflouresce, pipes to break, siding to fail or rainwater bumping up against footings or foundations. Buried downspout extenders are definitely more attractive and some runs need to be quite long to find a downgrade, so these caps that pop up when the pipes get full are very handy.

This one is pretty cool too. Click on images for links.

#drainage