The first thing that you will need to consider when undertaking any plumbing and drainage are the regulations issued by your Local Authority or State Department covering these.
If you are altering your existing drainage, or installing a new drainage system you must always inform the local Building Control Department at your local council offices. You will almost certainly need to present detailed plans of the work that you intend to undertake and it will need to be inspected as the work progresses making sure that it complies with local building regulations. If you are simply replacing damaged sections, in most circumstances they do not need to be informed. However, if in any doubt - check it out. A simply phone call should suffice.
To begin with we will take a look at drainage systems.
These can be described as Foul Water systems and Surface Water systems. Foul water is anything that comes from bathrooms, kitchens, utility rooms, car washing areas etc. Waste from these sources must always go to your foul water drain system.