Drain for new toilet - Gradient problem

[stepho]

I am considering adding a new toilet approx. 10 mtr from my house.The nearest access to the house drain is via an inspection chamber close to the house.However the top of the new pipe would be only 20cm.from ground,and if i allow for a gradient from this to the new toilet ,i dont have enough dept.Is there anything i can do to solve problem. House pipes are all plastic. :p

[TheRobster]

Have you thought about encasing the pipe in concrete? That's what we normally do for trunk sewers that don't have the necessary cover.

[danensis]

I know the BCOs insist on it, but I've always wondered about the logic of this. Plastic pipes have a degree of flexibility that a length of concrete doesn't possess. If the two halves of the concrete encasing the pipe decide to go their separate ways, isn't there a greater likelihood of them splitting the pipe if it is firmly encased and unable to flex?

I agree that some sort of solid cover is desirable to deter the inevitable over-zealous gardener.

[flowjoe]

Stepho

As available fall is already predetermined building control may allow little if any fall on the new line as plastic pipework is so smooth internally, this will depend on the intended use of the line, number of WCs, sinks etc.

If there is simply not enough fall you will have to rely on a pumped system either a sani-flow type arrangement to the rear of the WC or an external pump chamber to lift the waste into the existing system.

or as a last resort a bucket with a sprinkling of sawdust !

[stepho]

Thank you all for your help.
Im new to this forum technology.
Great i can ask some questions.

[Tony McC]

Danensis - when we encase pipes in concrete, we have to indcorporate movement joints at regular intervals: it's no a single solid mass of concrete.

See Laying Shallow Drainage

[stepho]

Thanks TonyMcC.