wrote:

I wonder why you didn't leave it deep?

Because water lilies don't grow in deeper water very well. We have
about a dozen water lilies. Also, I can use wadders in cold weather
when I am sinking the pots for the winter or putting the pots back out
for the summer.

My largest and most prolific lilies grow in 48" of water.

My pond varies from 2.5 to 4 foot deep. The original pool before I
filled in the deep end varied from 2.5 to 8 feet deep. So you see why I
had to fill in the deep end.
--
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA