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Underground drainage help


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Grateful if I could rack some brains.

 

I am going to dig a soakaway fed by 2 rainwater down pipes.

 

I’m looking to branch off using a 45degree fitting as shown below.

 

D7D9CBF3-9A15-40EB-8B8F-C7289428547E.thumb.jpeg.f89aaa66c2cb458f18bfb539d6e976d5.jpeg
 

12AF487D-B847-4243-934D-AF497F09A588.thumb.jpeg.69783417bd4f0bb06cb266a67b323afb.jpeg

 

Each down pipe will enter bottle gullies. Is a 15 degree bend a common angle to connect to each gully to give me the fall?
 

My entry points are fixed. Is there another way to achieve what I need that I have overlooked, perhaps running 2 straight pipes in to the soakaway to avoid the branch?

 

Also I ordered some geotextile fabric and explained it was for wrapping soakaway crates and they sent me some Groundtex - essentially weed membrane like this.


7FF8C442-E2C4-4840-ADBC-5E029DDEA4D0.thumb.jpeg.cc68cc066b7b3ea602482357c5db0b31.jpeg

 

Not sure I’m comfortable using that so may buy another roll of proper non woven stuff unless I am worrying too much and should just use it.

 

 

 

 

 

 

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