written by ella sutherland, cambia community
Cambia’s pond today, before the addition of the creek.
There are many reasons to build a pond. Here I’ll talk about all of Cambia’s reasons, the design and function, and how it relates to community.
When we were beginning to build our new common space, ‘the Barn’, we decided to create an earthen floor for the main room. This meant digging up quite a bit of clay to mix with sand and straw. But we also knew we wanted to have a pond. A small pond, for relaxation in the summers, for storing rainwater, for demonstrating the way plants can clean water. So we dug out our clay for the floor in a shady little nook across from the new building. Close enough to easily wheelbarrow over the clay, close enough that the pond would serve as part of the communal yard of the house.
Starting the pond dig, last summer 2016. The clay here was dug to use for the earthen floor of the barn.
Finishing the dig. Removing the last of the clay pile from around the pond.
The pond is about 10 feet in diameter, and three feet deep. It has a ledge all the way around it: one half for sitting, and one half for plants. The water flows in a cycle. Rainwater washes down the metal roof of the barn, flows through a gutter into a smaller pond. This smaller pond is in the sun, with lots of gravel and plants for filtering the water. The water then travels down a ‘creek’, lined with pond liner, gravel, and plants, and finally into the main pond. Fish eat all the mosquito larvae, frogs and toads moved in almost immediately, and birds are loving the new place to drink.
The smaller sunny pond that is filled with rainwater from the barn roof. The creek will connect the two ponds.
The plants provide many functions. They help to clean and filter the water while at the same time providing a beautiful, serene place to relax. The water hyacinths, when they grow larger, will provide shade to the larger pond, keeping it cold in the summer. Their long roots uptake the excess nutrients in the water.
We built a deck around the pond, using the scrap redwood from a deck that Twin Oaks disassembled. The deck is low, so you can sit on the edge and put your feet in the water. We lined the other half of the pond with flat stones that were unwanted at Acorn. This demonstrates the sense of abundance and mutual support between the local FEC communities. Both are a beautiful and essential addition to the pond.
The pond and deck, with the wood-fired hot tub in the background. The solar panel will power the water pump, which will cycle the water. We’re using the bilge pump from our landlocked sailboat house (more about that another time).
In the development of our educational non-profit, we are planning to use the pond to demonstrate to the children and their families who attend our programs the ability of biological systems to clean and filter water. It is a physical, intuitive, and hands-on demonstration of these scientific concepts: aeration, nutrient cycle, photosynthesis, the function of aerobic bacteria, providing habitat for the local fauna, while providing ourselves with a source of clean water.
The next step is to also set up a slow sand filter called a Biosand Filter. This is a filter that uses aerobic bacteria in a barrel of sand and gravel to make the water clean enough to drink. It is used in many countries where access to a well is limited. We built one in California, in the previous community where we lived, because we did not have well water and this filter produced much cleaner water than can be stored in rainwater catchment. It worked well for a number of years.
In hot Virginia summers, it is crucial that we have a cool place to sit and relax. It brings people together, slows us down, and help us to appreciate the beauty of the land we live on and the plants that keep us thriving. Although the creek is not yet finished, we started using the pond almost immediately to cool down when the afternoons are too hot.