Hopefully someone may be able to help - I want to have a wrap around patio/path on the house (see diagram) but if I have the fall from one end to the other i'd end up with a 197.5mm fall at 1:80 which is ridiculous! Can I have the fall in 2 directions? I have added red arrows on the diagram to show the fall direction. Would it be a case of having a ridge (red diagonal line) between the 2 falls?