I'm planning a pond. The books say 'put in a bottom drain to make cleaning
easier.' The (few) people I've actually spoken to say 'don't put a hole in
your liner - don't need a bottom drain.

I plan for about 1500 gallons, 24-30" depth. Probably no Koi, because I've
heard they generate a lot of waste (and get huge).

What's the feeling on bottom drains?