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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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Q: What is the best slope of 100mm diam PVC swer pipe?
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What is the minimum slope for 110 mm diameter underground sewer pipe?

1/8" per foot


How many liters of water in a pipe 100mm dia x10m long?

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.


How much slope from Slope from home to Septic tank?

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.


A drain pipe is to be laid between two points One point is 13 m higher in elevation than the other point The pipe is to slope at an 7.5 degrees with the horizontal Compute the length of the drain pipe?

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


Can you have too much slope on a toilet drain line?

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.