I didn't realize that you have a walk out... Still best to have a "sump" which is just a hole where the water can collect... I've always just used a 5 gallon drywall bucket and set the top at the same level at the grade stakes so when the floor gets poured it's a clean hole... That way, should you get a leak all ya' gotta do is take a floor squeegee and, waa laa... It done...

Also, seein' as the basement of this structure is like a big very tight cereal bowl then should you get a leak then the water ain't goin' anywhere...

Poor beardedbruce bought an old school house in New York with flooded basement... Not too sure if he got it pumped out as yet but I gave him some ideas on preventing it from occurring in the future...

B~