I finally figured it out, thanks to your advice, snrub. I put a 90 degree fitting on the bottom end, and it has been gushing like an artesian well ever since. Unfortunately all I could afford was 2" PVC, so it is slow going. When you figure in the rain, well, you get the picture. Now that I have the system figured out (on attempt 11 or 12), I just need about 7 rainless days to finally get it drained.

�That boy, I say, that boy's about as sharp as a bowling ball�