Water changes and filtration on 2000+ gallon above ground pond

[Wabbabe]

I am planning on building in a few months or sooner a 2000+ gallons above ground pond. It would be outside in backyard.

The picture provided is what its going to roughly look like. (Although changes and whatnot to size, considering the fish and their needs.)


Considering this placement of outside and such, how should filtration, water changes go about happening? I do plan to only have 4-5 fish max, as to allow territories and comfort. What kind of filter would be best? Would making a sump somewhere be better or is there another way?

 

[Wabbabe]

thebiggerthebetter How do you do water changes on your 4500? If you don’t mind explaining.

 

[duanes]

If you do a sump, add a port to pump old water to the yard or drain.
In that ways water changes are a breeze by just turning a valve, and watering the yard or plants gets another use.
I always sent old water change water from my ponds (and tanks) to my garden thru semi-permanent PVC plumbing..

https://hosting.photobucket.com/albums/i97/dstuer/2384/garden/.highres/125_zps4841f139.jpg?width=320&height=320&fit=bounds

 

[Wabbabe]

If you do a sump, add a port to pump old water to the yard or drain.
In that ways water changes are a breeze by just turning a valve, and watering the yard or plants gets another use.
I always sent old water change water from my ponds (and tanks) to my garden thru semi-permanent PVC plumbing..

https://hosting.photobucket.com/albums/i97/dstuer/2384/garden/.highres/125_zps4841f139.jpg?width=320&height=320&fit=bounds

Thanks for the info