I have a problem with rainwater flooding a sunken paved patio. I would like to install a drain at the lowest point and run a pipe to a nearby gulley which has a kitchen waste running into it. Firstly, is this acceptable and, secondly, how to I connect to the gulley underground? The alternative expensive solution would be to raise the whole patio and slope it into three gulleys which exist at the back of the house (something which the original builder should have done). Any helpful suggestions welcome.