Hi, This is my first thread as you will be able to see. Not sure if I should be in Construction or DIY 'cause it is both but... I have researched Koiphen for several years and built my first 1,200 Koi Pond with the help I received. My new project is way too complex for this simple DIY’r. I have attached a picture of my 22,000 gallon pool that is to be converted partially to a koi pond. Also attached is a drawing I have made of the future plans. None of the existing plumbing can be used (leak somewhere). As you can see there is a concrete sidewalk surrounding the pool area and chain link fence. I plan to create the walls and divisions with sand bags and backfill the voids for planting and walking. I will probably have to raise the pond above the pool edge to accommodate an overflow and I also will not be able to have a waste drain. I am thinking I will have to use a trash pump from the settlement chamber.
I am just now working on the drawing and filling sandbags. The finished pond is supposed to be approximately 17 X 12 with a 12 ft stream. I plan to have 2 TPR’s and a No-Niche Skimmer. I will need to know what size piping to use in some areas. Starting from the bottom up… I know I need 2 Bottom drains. My first concern is that, given the space constraints and layout, one of them is about 8 ft further away from the settlement chamber than the other. What is the best way to compensate for that? I wondered if I should make one 3” and one 4” and enlarge the settlement chamber…Or….open for advice.