downspout mystery

[John Arnold]

What the...?!

30756

[Raymond Wand]

Eight minutes and thirty-five minutes into video (8:35)
Rainwater Collection: Installation - YouTube (http://www.youtube.com/watch?v=ObFeXm4i0NU)

First flush system for rain water collection system. Except as in your picture indicates an incomplete system.

[Mark Reinmiller]

I have seen similar setups in Lower Gwynedd. On-site storm water collection and overflow pipes in case the pit or tank is full.

[John Arnold]

Thanks to both of you!