High tunnel rain catchment system for natural swimming pond

Check out my cement pond video. I built in 2012. Its 32 ft wide 52 ft long stair stepped to  11ft deep 2 inches of cement covered chain link and chicken wire. It is for swimming fishing and irrigation. Its on the very highest part of my property and have no problem filling in the rainy season with the run off of my high tunnel.I dug a ditch and lined it with plastic and filled with gravel which leads to a 4 inch pipe and then into the pond. Crystal clear water, in my video you can see the bottom at 11 ft. I plan on building a lower pond, probably not concreted to use to circulate and keep the upper (cement pond) at a constant level and the overflo would also act as a skimmer to keep floaty junk out. Swimming is a great way to stay cool on the homestead plus hours of entertainment. I plan on doing a better more in depth video on this in the future plus a lot of other homestead and building vids.
Check it out on youtube
  if this link does not work my channel is william e   the video is called  My cement pond

Wonderful pool! Excellent spot high on the land. Clever move. How did you make the rain run of the high tunnel into the pool?

I dug a ditch and lined it with plastic and filled with gravel which leads to a 4 inch pipe and then into the pond. Don't know how it would work in a dryer climate though but here in mid Missouri it works great.

Of course. Did you make it go under the sheet of the side of the high tunnel or does it work fine with a little space between the two?

I just butted it against the side but could be put under or tacked to the side. I loose a little water that leaks out and soaks into the ground but hasn't been a problem, in a dryer climate it could be though.