In our permaculture design for our land from 2017, we included a little pond, about 11 by 12 feet round. Every so often, I would dig in it a bit, and find a place to put that soil. Finding a spot for what is dug up is actually a major issue in digging a pond. Some of the topsoil made its way into what is now a bed for blueberries. But mostly, I didn’t have the energy to take on another big project.
However, this spring I felt a burst of energy each time I went into the yard, and I felt the future pond calling to me! So I read once again Robert Pavlis’s book Building Natural Ponds, and made a list of everything I would need. I talked it over with Margy. The biggest expense is buying a pond liner, recommended 45 mil EPDM rubber. For our size pond, with the deepest part 3 feet deep, we’d need a 20 by 20 foot liner. (Formula: width plus 2x depth plus 2 feet for edge, times length plus 2x depth plus 2 feet.) Other needs include old carpet strips to lay over the ground under the liner, to protect against roots and rocks–and we’ve got bittersweet roots, so this might be essential. It will need lots of stones to line the planting shelves and the edges, and then a number of pond plants, to serve to clean the water, and of course to look beautiful. This kind of natural pond does not have any mechanical filters–just plants. So 1/2 to 1/3 of the pond is made up of planting “shelves” that are only about 8-12 inches deep.
Why include a pond? One reason is that it brings more water into the landscape. For some sites, ponds are a way to store water, but that won’t be as big a need for our site. We have rain barrels for that. We can use water from the rain barrels to fill the pond, and refill as needed. For us, a pond will mostly be for wildlife, like frogs and birds. We are told that if you build it, the frogs will come. And for us, another reason is to be able to look at the beauty of the water and water plants, when we are sitting in the yard. What a good reminder of the sacredness of water.
The biggest amount of work to make the pond is the digging. But we finally figured out a place to put the dirt. In the back corner of our yard, some former resident dumped a pile of concrete and metal demolition junk. We’d thought about trying to haul it away, but that would be a huge job, and cost money to take away. Most years, it has been covered with wild raspberries that don’t bear any fruit because it is too shady. This spring, I pulled out much of the raspberries and some invasives, and got a good look at the junk underneath. Concrete, metal, demolition debris.
So this is where we will put the sandy under-soil I dig from the pond. Then I’ll put cardboard over the resulting mound (to rein in the invasives), put down some compost and other soil on top of the cardboard, and then plant some shade loving plants on the mound. Another project.
A few days ago, I started an overflow spillway, an area on the edge of the pond that is 4 inches lower, so if the pond gets too full, the water has a place to go. I figured out, from the book, that it didn’t have to go very far, maybe 8 feet away or so, where the water could sink into our sandy soil. Then, the last few days, I have been slowly digging out the first layer, to the depth of the planting shelves. Here is how much I was able to finish by today.
I shovel out the dirt into a wheelbarrow, using a level to try to keep the pond surface level–which will be important–then I bring that dirt over to the demolition pile, and dump it there. It doesn’t actually look like that much, but I hauled away several wheelbarrows full just in the last couple days. I don’t know what the former residents did with this part of the yard, but it seems like there are some ashes and charcoal buried in the future pond, along with a very rusty sandy soil. Oh, and here is what the junk corner looks like now.
So, yesterday, I ordered a pond liner. I was able to find a liner, with an underlayer, for $438. I also posted on “buy nothing” and “freecycle” pages requesting old carpet strips. I’ll keep you updated. This is going to happen!