They will become dinner....
Lol, don't get caught! Herons and egrets are protected in most states.
$10,000 fine. Depends on the state.
My personal preference is making duck dinner out of every Canadian goose that is still here in July. But that is another story.
Anything deeper than 18" is usually too deep for the herons to wade in.
Criss crossed stretched out light weight fishing line can be the least visually obtrusive defense.
Motion sensing water sprays are good mostly for cooling down when you forget to turn them off...
Depending on where you live, (suburban, usually) anything deeper than 18" is a 'pool' and needs a fence with a locked gate around it. Some 4' high, some 6' high. All depends on where you live.
Your liner should survive a nuclear attack. But may be vulnerable to nutsedge. :-/
Google nutsedge and above ground pool liners. :-/
Your rubber pond liner should be much more sturdy than a pool liner. :- )
The waterfall liner/splash zone will be the bane of your existence. ;-)
Get that right and you will be golden.
Keep in mind future growth (water cress from the supermarket, among other awesome supermarket weeds) can divert water out of the water fall later on.
Aeration and pond marginals/weed filtration (believe what he said about plants! :- )) will make you very happy.
Looks like yours will get a lot of full sun. A healthy UV unit that keeps killing the algae hourly wouldn't hurt either.
We cheated with our 10' x 10' by only 18" deep bucket.
No waterfall stuck on one end. No drainage nightmares.
"Keep it in the bowl" makes for fewer options but less hair pulling.
We might add 300 to 500 gallons a summer to top it off. Maybe 3 or 4 times a summer depending.
(5 gallon buckets with amquel.)
I will let it fluctuate up to 2" if we are expecting rain later in the week.
Ours is mostly in part shade and we have decent rainfall. (About 45" of rain a year)
We just have a central fountain made up of a cinderblock hiding space/foundation with a lightweight multi tiered flat fountain made of 1' x 1' slate pieces.
A manifold of irrigation tubing off the pump (7 sections?) and a few hidden slivers of slate gave me the ability to make an 'even' water display.
Keep in mind if you want sound the water has to actually 'fall'. Not just slide around the rocks.
A small echo chamber behind the falls also helps.
This is the most underrated and unanticipated concept!
Have yet to read a water garden book that even mentions considering or amplifying sound.
Truly amazing considering the appeal it adds to the water feature.
Those traditional 3 tier circular fountains are the *best* at adding sound for a minimal amount of water.
More and more appreciation for them as the years go by.
Your pond is looking beautiful!