I am about to (in the next month or three) start working on the storm water drainage for my house. Currently 3 of the 4 downpipes dump water directly onto the ground, some uphill from the house, and only one of them leads to the gutter on the side of the road. It is my cunning plan to run storm water pipe to this same outlet and feed all of our stormwater into it.
A picture is worth 1000 words, so here it is:
Now, my questions:
1) can anyone see any immediate problems with me doing this?
2) for my underground pipe, what should i use? Bunnings has 90mm and 100mm. The 100mm feels a lot stronger, but usually when talking about storm water people discuss 90mm. Considering how cheap it is I don't mind which I use, but what is the correct choice?
3) I would like the aboveground pipe to be as inconspicuous as possible so I would like to use smaller than 90mm pipe for this. Is it true to say that any pipe that has been painted in exterior UV resistant paint will be safe from the sun?
4) The underground pipe will be underneath an area that has already been concreted over. I intend to cut "slabs" into the concrete to gain access. What is the minimum depth I should aim for running the pipes? The area will only ever have irregular foot traffic (it will end up having a deck over it). It will never see any vehicle traffic.
Any advice would be appreciated.