Originally Posted by STL Ponds and Waterfalls
I see the lightbulb finally came on.
I didn't even think about the weight of the water helping displace any underliner water.
The house is a good 100-150 feet from the pond.
Tad, do you think I should cover the liner with a soil or gravel?
I am assuming that this pond is at least 2 years old.
This is the plan that I would follow:
1. The obvious draining and temporary housing of the fish.
2. After pond is drained, I would remove, at least, the top 6-8 inches of soil/muck from the existing bottom and save.
3. Make any desired modifications to pond depth, shape or form (shelves, shallow areas for planting, etc.).
4. Install underlayment (Yea, I would use underlayment) and liner.
5. Backfill with previously saved soil/muck spread evenly.
6. Refill pond. Allow to sit for at least 2 -3 days before re-introducing the fish.
7. Encourage the HO to add some aquatic plantings.
The main item here is reusing the existing Benthic layer which is already populated with the bacteria and other benthic micro- and macro-organisms to establish the Nitrogen cycle and Food chain/web. Although some organism mortality is unavoidable, recolonization will be rapid due to the presence of eggs, spores, cysts, etc.