Mike Jay wrote:If it's 9' from the gutter (inlet of pipe) to the ground and 3' back up to the top of the distant tank, the water level in the "U" of the pipe in a perfect world is right at the top of the tank. Assuming that tank is 6' high, that gives a modest amount of pressure from the standing water in the piping.
Mike Jay wrote:I guess I'm still confused. How much is leaking out? I'm imagining a slow leak... So when it's raining and the "U" is really flowing it leaks 1% or less. Or is it more than that and it's making a muddy mess?
Are you thinking of putting a pump at the downhill end of the "U" to pump water up into the tank? My guess is that you could arrange for a large sprinkler pump to push that water up into the tank for you. But plumbing it and getting it to come on and off on a float could be a challenge.
If I understand the situation, it seems like fixing the leak is the real solution, a pump would be an expensive band-aid.
But I could be totally misunderstanding...
Mike Jay wrote:Ok, so when you dig out a leak, how is the pipe/coupling actually leaking? Is the coupling breaking? Or is it that the glue joint between the coupling and pipe is letting water squeak out?
Sorry for the silly question, but are you using the correct primer and glue for the plastic? There are a number of different pvc glues and primers depending on the exact type of piping.
If the glue and primer are done properly, I think the plastic should break before the glue fails.
Sorry, I know you are interested in a pump but I'm still stuck on figuring out the root cause of the issue.
Wayne, I think the leaks are only happening under the full force of rainwater coursing through the system. When it's not raining the "U" doesn't leak. At least that's how I'm reading it.
wayne fajkus wrote:I dont see any method that would not leave the "u" full of water cause at somepoint the pump will push air. Air wont push the water up the "u", it will fall back down.
It seems that pumping would require an inner flexible pipe inside your pipe. The pump could be above ground. Like water falls in a barrel, sump pump pumps that through the old pipe (via inner pipe) into the main tank.
wayne fajkus wrote:A sump pump will handle the volume and has a float switch to prevent dry runs. The downside is it won't clear all the water from the sump tank barrel. That 1/2" of water left behind will algae up, breed mosquitos, collect ick. Next rain event will put all that in the cistern. You would still need to run a smaller flexible hose into old pipe. Once the tank is full, will water still flow out of the cistern and into the cavity between outer and inner pipe? You never answered if you had an overflow built in. Where does it go?
There are companies that can inner sleeve the existing pipe. Not sure how it works. I found it one time when doing an exhaustive search on an inground pool with collapsing pipes.i ended up digging it up instead. Never pursued it.
I understand your angst. When you start understanding the other problems your solution may create, i cant help but think to fix the problem, not work around the problem. The rubber flex joint. Or when you do dig and repair dump sand in the hole instead of clay since it is stable. Either allow it to move without deteriorating the joint, or do something to prevent the movement.
Its easy for me to say that. I am here, you are there. Lol
Hunteric Thomas wrote:
Yes, it is from the pressure of the 6' high U. Also, this is schedule 40 PVC in clay soil that likes to swell. It only leaks during a good rainfall when it is exposed to the full pressure on the pipe.