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Much betterI doubt the 2" pipe will keep up with anything other than a moderate rain. A thunder storm dumping 7" an hour will overcome a 4" pipe.
Quote from: Flyin6 on February 17, 2017, 09:18:29 PMMuch betterI doubt the 2" pipe will keep up with anything other than a moderate rain. A thunder storm dumping 7" an hour will overcome a 4" pipe. Based on my kin-tuck math, the cross sectional dimension of the typical downspout 3x4 inch is 12 square inches, for a 2 in pvc, it is only 3.1415 sq in. So I'm afraid I would have to agree with Don that it might not keep up. However, if you are going from a 3/4 in hose which only has a cross section of .441 sq in, you are about seven times larger now than before. How did your previous system handle the backlog of water during a good rain?
Or you could add a downspout at the other end of the porch and double your collection rate using more 2 inch pipe. Not having a view of the other end of the porch I don't know if that's practical Sent from my iPhone using Tapatalk
Having a plan for the overflow is a good idea but I think gutters should hold a full load of water if put up correctly. I noticed one storm water was overflowing the sides of the gutters....afterwards I went up there and a tennis ball was covering the drain (kids....sheesh...ha)....the entire length was full to the brim...36'. I pulled the tennis ball and it emptied in a flash. But it should hold the weight. Of course as with anything like this....ymmv!
Just had a thought, the plumbing looks solid which makes me wonder what happens if/when your two inch line is completely full of water heading to your tanks? Do you have an air vent to let out the increasingly pressurized air or is the tank going to have to burp eventually? Not sure what the right way to handle it would be, maybe just not tightening down the threaded fittings at the top of each tank would be enough to let the air hiss out as the water fills it up. Also, for you overflow you could plumb a standard Tee into the section between the two tanks facing up at a small angle, should give enough resistance that the water would still follow gravity into your tanks until they are full and then just over flow from there. It would give you the opportunity to plumb in another pair of tanks there in the future if you wanted also, or just run an over flow line off to another location. Anyway, just a couple of thoughts from a nonprofessional who thinks he knows things.
Had a few nights like that in Mn years ago. Don't miss twisters at all.Can you run a one way valve that will allow the top couple inches to syphon out? Of course if you don't mind them being topped off its not an issue. Maybe a funnel cut to fit the fillers so the venting stays open but crud can't get into the opening you have?
Stewie, what about replacing the 2 elbows right at the tank, with y-pipes. Stand the Y up, have the water enter on the angled side, and then hook a cross pipe from y to y a few inches higher, with a valve on one end for venting and overflow? you could hook a fire hose to the end and run your overflow wherever you want..?.something similar to this:
Are you still around on here stewie? How is this working out for you with all of this rain?