Thanks for the thoughts, etc. Here is a followup for some of the thoughts/comments in case anyone is still monitoring this thread.
I'm not too concerned about water standing in the pipe or needing to be full before draining. The images below show a small slit at the bottom of the elbow. This allows any standing water to empty out in to the pea-rock I'll put below it as a sink. (This is a special 4" elbow designed to fit the cap, not a standard 4" PVC elbow.)
Also, with an 8" drop in 15', the water will drain out of there pretty well. The one in my backyard has a 33' run and only a 6" drop and it works very well. After a hard soaking rain, the elbow is completely empty in a few hours.
Re: the sump pump backing up... one dare not bet against Mother Nature so I continue with caution. The frost around here doesn't let go until April/May. The ground above should be thawed before the pump starts working. It only needs to pump for a few weeks during the spring wet season. (My basement is only 3.5' in the ground.)
I think that a separate 2" line all the way out into the yard might be a better way to go. I should be able to bury it along side the 4" when I'm putting that in. I think an extra check valve is a good idea.
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