Drain is a must have. The cheapest/best option I've come across is a tapered 2x6x what ever length drain you want, installed over a 3" drain running to sewer/drywell or daylight. set the 2x6 to desired concrete height. Fasten 2x6 with rebar so it won't move when pouring concrete. Once concrete is poured remove 2x6 and you a nice trench drain with a 3" or 4" outlet in the centre.
There are better drains than this, but by far this will be the cheapest. If you are tying into sewer system don't forget an accessible p-trap along the line.
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