As promised, I had a bit of time before heading into the field.
Picture is attached. Sorry, I'm not the artist in the family. The conical cap is 3" over the tip of the pipe. The pipe that I've seen are between 24" to 36". The cap is made of aluminum, which can also be replaceable. The permanent cap was made of stainless steel. For the stainless steel cap, they also install a 1/2" mesh around the cap's bottom to prerevent debris from entering, since the area is heavily occupied by commercial activities. The aluminum cap outlet is more for the smaller downstream stream ponds designed to direct all flow into the underground CDS unit for further sediment, oil, and debris separation before allowing the water to flow into recharge basins about a mile downstream.
Leo
* Knowledge and experience yield wisdom. Sharing wisdom expand the generations with crucial knowledge. Unshared wisdom is worth nothing more than rotting manure.
