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lee, go to a builders merchants & see just how cheap you can get some plastic 'aco' style drainage, it comes in 3m lengths & has an integral grid on the top, which would be dead easy to cover in plywood instead..... you'll trip over the groove so many times & wish you never did it..
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oh, i thought you were just running a lowered channel out to the door....
i was on about this stuff...
http://t1.gstatic.com/images?q=tbn:A...EPksC90wcBdaAI
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just remember that the drain pipe will be needing some form of anchorage, or it will float up thru the concrete, and the concret will be quite weak there too.
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what we usually do is saw cut it wider for a start, then rattle some out with a kango then use the saw to cut it further in. you end up with a stepped edge, whic helps support the repair section afterwards.
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just get a cheap sds type thingy from a diy store & when it knackers up , get a new one on warranty, then sell it
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