need advice on commercial quality pump(s)

[Pawl]

Hi everyone! Thanks to the admins for hosting this site.

We're beginning work on a project with the following particulars:
30,000 gallon pond
175 ft distance from pond to top of stream course
25 ft vertical drop
goal of 250-300 gpm

Further details:
As I understand it, our total head will be about 42 ft, adding distance to drop. We want submersible pumps, but would be open above ground if need be. We assume two pumps with 2" to 4" lines (suggestions?).
Though it would be nice to have some variability with gpm, however my limited understanding suggests this is not possible with submersible pumps, correct?
This will be in a public venue (in a botanic garden), not that this affects the hardware details. The watercourse will flow about 9-12 hours per day (7 days per week). We welcome several hundred thousand visitors each year and charge no admission (we are a nonprofit that operates by the generosity of donors).
We will have fish (probably trout, possible other fish native to the region) in the pond.
Our goal is [eventually] power this by solar panels (we have plenty of space for however many panels this would require), and would appreciate any thoughts/insights/suggestions on this topic. I say "eventually" since we will likely not have this in place by the time we want to complete the pond and stream and have it open to the public.

I invite your opinions on makes and models of quality pumps that could carry that load and of a grade—commercial?—that we will not have to be replacing them in two years.

Thanks in advance,

Paul

 

[Meyer Jordan]

Quite a large undertaking. I would immediately rule out solar. DC pumps, if even available in this required capacity, would be quite expensive not even thinking about the footprint required for the panel array to power these pumps.

You do not mention any planned filtration. This will absolutely be required in this size pond and must be of exception capacity and efficiency especially if Trout will be housed.

The watercourse may run part time, though not advised, but filtration must be functional 24/7/365.

You may have underestimated your total flow requirements. For maximum water quality levels, a pond should have a turn-over rate of 1.5 - 2 per hour. In your case: 45,000 to 60,000 gph or 375 - 500 gpm per pump. And these pumps are not found at an Ebay price. Expect to pay $4,000 - $6,000 per pump minimum.

 

[sissy]

I have you checked into the solar panel trees .They have them in Cherokee NC and they use them there to run there water features and the gift shops .They turn towards the sun during the day and give a modern twist to the area

 

[Pawl]

Thank you both.

Food for thought.

 

[mgmine]

Check these pumps out they are built like tanks.
https://www.tsurumipumpsales.com/pond-pumps/