Wow…what a great thread! I am getting ready (hopefully!) to build my first pond in a few weeks but at am a loss of the best way to make it all work according to permaculture principles. My pond will be built by widening a portion of an existing springfed brook in a relatively flat landscape between 2 hills (on either side of brook). The pond will be long (300’) and narrow (100’) with essentially a contour dam all around it. I am going to dig down maybe 20’ at the downstream end and leave the upstream end rather shallow (4’) and lined with rocks. I will use it for general water security but may hope to also stock it with trout once it has “developed”. The footprint will be irregular with lots of edge but likely no islands. I thought about adding some “fingers” to provide shallow habitat for smaller fish but because of the existing topography (ie. hills on either side of brook) it would be tough to do.
I don’t think a monk will work because a) I need to have a good size culvert (12” or more) because of existing peak brook flow and to meet local code (100-year flood), b) my water levels on either side of my downstream dam are only going to be maybe 2’ to 3’ different – at best and c) I live in Canada and I can see those PVC monks getting cracked pretty easily with any amount of ice on the water surface (the brook always flows but it does ice up on the water surface).
Any other design ideas I should be thinking about to help with aeration? To improve fish habitat? As options to a culvert? Thanks