Well, everyone was helpful, and I thank you all. I was still going to run the 3/4 Pex, until Terry mentioned the difficulty with keeping up with the inflow. Here in Tennessee we don't just get rain, we get dumps: it just comes through, washes out the streets, then the sun returns. It could do that every day for a week or more.
My wife wants to remove the over-the-ground accordion pipes that run the roof downspouts, so they will have to be draining into this system, too.
So I decided to stay with 1 1/4". I could have it pumped into the waist line of the house, but it's illegal to do. I have to pump it out to the street drain, which means part will go through an area where people will walk. I will use plastic pipe under the porch, but change to galvanized pipe where people will walk on it since I cannot bury it too deep.
Unfortunately, there new problem with the project: the sump. It'll be out in the garden next to the house because it's very difficult to get a hole big enough and deep enough when working under the house. Unfortunately, before we got to the right depth, we hit the water table. The hole is about 1/3 filled and it hasn't rained in a week. When we pumped out the water, it flows back in, and the plastic tub I got at Lowe's eventually started to float - even weighted with two large stones. We assume there will be a time when it'll rain so much, the tub will float even with twice the weight in it (any more would not allow space for the pump). There is cement that hardens under water which we could use, and would use, to seal the hole, but it's very expensive (you'd think that since the ancient Romans used it, it would be only a little more expensive than regular cement). So we'll be going with a flue box sealed at the bottom with vinyl patch and cut holes in it with masonry tools for the input line (which will have to be about 6" below ground level). The outflow can come out of the top.
Ahhhh …. The joys of home ownership!
To: DoIt_Yourself@yahoogroups.com
From: DoIt_Yourself@yahoogroups.com
Date: Sat, 18 Jul 2015 09:55:57 -0700
Subject: Re: [DIY] Re: Pump output line
Never claimed that a sump pump was a "positive displacement" pump....
BTY, repaired my first Graco Monarch 23:1 positive displacement pump
with a 3" air motor in 1965 (50y).....With all this side chatter, I wonder what
Ron has decided to do?....Pumps
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Posted by: Ron Johnson <l0c0l0b0@hotmail.com>
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