No, you do not need to drain your pool. In fact, it is way better to keep the pool full so as to save water replacement every spring and the fact that the pool cover will sit higher makes it last longer too. There is a product called an AQUADOR' that covers the skimmer opening much like a Tupperware lid that keeps the water in the pool. It is inexpensive, easy and earth friendly.
they are formed above and below ground
They grow above ground. It is a stem plant.
Below ground
They live above ground.
A Swede grows below ground.
ABOVE
above - sky as below - ground above - airplane as below - subway
Below ground, just like a carrot.
Above the ground
above.
Cabbage grows above ground.
It is formed both- above ground (as extrusive igneous rocks) or below ground (as intrusive igneous rocks).