Installing a Swale
Last Saturday we hosted our first workshop of 2017, featuring Alden Hough of Sky Mountain Permaculture. Alden is a master at creating earthworks, and he spent three hours here at Finch Frolic Garden teaching a class of sixteen people how to install swales correctly. The project was a small pond that overflowed and flooded when heavy rains hit. The soil is heavy clay and therefore the small pond doesn’t percolate. It is kept filled by the well, and its overflow feeds the bog and the big pond. Right now the little pond is full of native Pacific chorus frog tadpoles, which will evolve into small frogs that will go out into the landscape and eat bugs the rest of the year. He created a urbanite (cement chunks) spillway into a twenty-foot swale. The class learned what a bunyip was and how to use the water level, and how to use a laser level. The swale will hold about 300 gallons of water that would have overflowed into another area, spread and sink the water.
The swale was measured and marked on contour. Bermuda grass was pulled from it and set into trash cans to cook in the sun and hopefully be destroyed. The swale was then dug by hand. Old wood – branches, logs, boards and old posts – were laid below the swale, and covered by the dirt. This hugelkultur will absorb seeping water, aerate and enrich the soil, and provide food and water over time for the trees downhill.More dirt was needed to cover the wood so we emptied the first rain catchment basin on the property of silt and hauled it down the hill. This was a lot of heavy work, and several of our attendees worked extremely hard with the wheelbarrows. Miranda and I have a lot of experience doing this heavy work, and we are glad that this swale project also emptied this basin.
Our wonderful workshop attendees worked very hard in the heat. The end result was a swale of beauty. By creating level swales dug on contour, you can see how right it looks. It hasn’t been dug deeper into the ground at one end to force the swale to be level. If you measure on contour your swale can be of any size, and it will collect, passify, spread and sink rainwater into the landscape. Earthworks are the best way to hold water, and are imperative to reestablishing water tables, keeping wells running, keeping trees alive and maintaining springs and streams. A little earthworks will make a huge difference.
What needs to be done now is to create a dedicated overflow from the swale into the main pond. As this area receives a lot of foot traffic, we’ll also need to haul more silt to make the raised walkway more gradual and blended with the paths around. Once the tadpoles have grown and left the pond, we can drain it and use that silt. Two projects in one.
Prior to the project Miranda carefully removed a lot of healthy creeping red fescue from the work site. After the swale and spillway were dug she replanted some of it. Native yarrow will also be planted to help hold the swale.
A huge thanks to the many people who came to learn and work on site. No matter how many movies you watch or books you read, having hands-on experience makes the education click. And an extra huge thanks to Alden Hough for his expertise and hard work. Please visit Sky Mountain Permaculture in Escondido for more classes – earth bag dome building included – coming up there.
Our next Finch Frolic Garden workshop will be in April: April 22, 2pm – 4pm: The Many Benefits of Trees: Care, Nurturing and Pruning . Roger Boddaert, the Tree Man of Fallbrook and professional landscaper who planned the original garden that would evolve into Finch Frolic Garden, will talk about trees. So many trees are dying due to the drought, and we need to replace them to help shade and cool the earth and hold onto moisture. But what to plant, where and how to care for them? Roger will take you through tree care based on fifty years of experience in landscaping. Visit https://www.southernpalmetto.com/services/ and get all the details.
Go forth and dig swales!