esshup,
Thank you very much for your response.
I used a CAD digital terrain model to calculate the volumes, so they should be accurate but I will have to do some hand calcs to double check.
I put the lower inside pond slopes at 2:1 so I could have a deeper center with less water volume. I am worried about keeping the pond full and how much I will need to supplement runoff with rural water. I was planning on only compacting the in place material with a excavator's sheepsfoot attachment. I will have to look at redesigning with 3:1 slopes for constructability of the 2nd and 3rd lifts of liner.
I planned on a settling basin to keep silt out of the runoff entering the pond, but hadn't thought of re-suspension. That is good to know. Would you cover the side slopes in pea gravel or sand or just the pond floor? How thick of a layer would be necessary? If it is place on the side slopes, would you compact the rock/sand into the clay? With the additional cost of the rock/sand plus the cost of constructing a clay liner, is a plastic liner a good option?
Thank you for the fish suggestions. I hadn't even thought of putting fish in the wetland cells. Is 6" of water enough for them?
If anybody has any thoughts on wetland filter sizing and rock depth in the filters, I am all ears.
