Originally Posted by oldog/newtrick
How do you see or check the water level in the storage unit?
First, you should know that I'm lazy by nature.
So the more something takes care of itself, the better. That said, here's how the system works.
There is an access cover on one side of the cistern. This gives me access to the submersible water feature pump and associated plumbing. There is also an electronic level sensor (Jandy Levolor). It senses when the water drops to a minimum level (enough to run the water feature, but not enough to irrigate). When the water drops to this level, two things happen. First, the booster pump is de-activated and water supply for irrigation is switched over to city water supply/pressure. Second, a valve opens and keeps the water at that minimum level by refilling with city water, much like the float in a toilet.
Our system turned out to be a bit larger because we had the space, and they had extra boxes. I think it was really because they read the plans wrong and dug the hole too big, but it doesn't really matter.
I haven't worked out all the control details yet. My laziness, and my being an Engineer by training drive me to automate things as much as possible. There will be some logic control on this thing at some point, I just need to figure it out.
Here's a picture of the access panel, and a diagram of the system...
For more information, go to Water Gardens, Water Gardening, Ponds & Backyard Pond Designs
or Rainwater Harvesting Collection Systems | RainXChange
They have a TON of information there.