I bought a small sump pump and dangled it off the diving board and it's been running several days now, slowly draining off the water. I've got it suspended well above the mud and leaves so it hasn't clogged up yet. I have to get the debris removed and the sides scrubbed as well as I can before the pool repair people come out and repair the main pump. I didn't want to immediately try to suck mud and leaves through a new pump.
There are also probably several hundred tadpoles still in the deep end and I'd love to rescue some of them. I tried last time with little success.
UPDATE: I was wrong about the big snakes. One was hiding under the leaves when I tried to scoop him up. He made a mad slither down to the water.