Three options if you wish to drain:
If you have a sand filter, and have a backwash hose, you can do that to drain.
If you don't, but you have a manual vac hose or garden hose (socks over ends to prevent liner damage suggested), submerge it from one end to the other, filling it all with water completely, no air. Then, quickly lift one end over the wall and down to the ground as swiftly as safely possible and like magic, gravity and water pressure will pump pool water onto your lawn wherever you place the end of the hose, safely away from pool footing and base. This is a motor/pumpless way to siphon water from your pool. When you've pumped enough out, just remove hose. Set a timer so you don't drain it below the skimmer basket (or just turn pump off while siphoning.)
Submersible/sump pump. But that requires electric ...so don't do in standing water or rain.