Start construction soon, need review pond location, digging

[ccna]

Hello, newbie here .

I attach a rough grade plan for a 6x12 with 4' deep + 1' above grade for plumbing installation : can some of your experts please commend and see if I blow anything crazy ? :biggrin:

Pond will be for koi with additional filtering system under the (separate) walkway.

TIA,
ccna

 

[sissy]

how many koi they get big and produce a lot of waste .I have 2 filters and 2 pumps and after 9 years koi are over 2 feet long ,Wish I had known this before I bought them