Yes, the stream is the northern line of the property. I've lost more than 10' of land to storm water drainage. But that's another project in itself.
The southern end of the property borders a national road that is probably 15' or more above average stream level. Flood waters have come from both the east (river) and the west (storm water drains), but they will always drain to the NE corner of my property.
I was thinking of putting a concrete form utility floor sink in the NE corner of the basement, where a drain could help move things along. But I also like the floor = door sill solution. I may rock both, unless having a drain from indoors to out would present a problem. I'd rather not drain it to sewer, but recognize code may prevent a direct drain.