No drain is okay but you do need so way of gettin' water out of the basement in case of a leak (water supply line, hot water heater, pressure tank, etc...)... See if the boys will dig out for a 5 gallon bucket so when the pour yer floor it will be like a hole next to a wall... That way you can put a sump pump in later and then if you have a leak the water won't stand in yer basement... A lot easier to do it before you pour concrete than after...

B~