building control now advise a fall of 1 in 40 which equates to 25mm per metre, however I belive that 1 in 80 is more than adequate 12.5mm per metre, I think if push came to shove you could get away with 1 in 100, 10 mm per metre,
Steve
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1/8" per foot
The volume of the pipe is [ (pi) x (Radius)2 x (length) ].The radius of the pipe is 50 mm = 0.05 meter.Volume = (pi) (0.05)2 (10) = 0.07854 cubic meter (rounded) = 78.54 litres.That's the volume of the pipe. We have no way of knowing how much watermay be in it. It may be empty, or full of spiders, etc.
The sewage pipe from the home to the tank must drop from the horizontal between 1 in 80 and 1 in 40 to ensure the water and solids stay together in transit.
Here we have a triangle with angle A 7.5deg and opposite side O 13m, and we're looking to find the hypotenuse H which would be the drain pipe. Remember sin A=O/H, so H=O/sinA. H=13/sin7.5= 99.6m
No. If you think about it, upstairs toilets actually drain through the walls and down under the foundation and footings, so you would have a 100% slope there. You can have too little slope, but never too much, since gravity is actually what drains a toilet. Yes you can. Pipes that run vertical are not a problem because friction is not acting on either the solid or the liquid matter. Where a pipe is sloping steeply the water can run away leaving solid matter behind.