This last week at our farm has been intense. It’s been all about the swales.
On Monday, after a few phone calls and a lot of planning, we booked in an 8 tonne excavator to help us dig out the swales I’d been busy marking out on the block. Our friend S has his excavator licence so he was happy, no keen, to dig out the swales.
Tuesday morning saw us all up at the crack of dawn to meet the excavator that was arriving at 8am. When it arrived at 10:30 we (less the kids who were at school by then) were keen to get started, so that’s what we did.
We knew we had rocks through our pasture but never did we expect so many big rocks to be just under the grass. Pebbles the size of your fist to monsters the size of a human. Some were closer to the surface than others, but we have dug and dug and eventually, at around 5:30pm today, we overcame!
ALL the swales are complete!
The swales are all running on contour. This means that as water flows downhill (or trickles as our slope is very shallow), the water will run into a swale. Each one runs for as long a distance as we could make it run, some half way across the block before heading back up to the northern boundary. If water was to fall on the north-eastern corner of the property it would enter into a small swale which, when full , will overflow over a carefully placed spillway that guides it into the next swale. That one will then fill, before it overflows into the next, and so on, until it reaches the south western corner of the farm. Each swale will stay full when it overflows, as will the dams, keeping a lot of water to rehydrate the soil.
For those that don’t know swales, imagine those squiggly lines from a contour map, all about 1.5m wide, 20-30cm deep and all puddles!
In the future we hope to enlarge our current dam a little and install 2 others, each connected into a swale. This means when the dam fills it back-floods along the swale. If the swale captures water it will trickle (it’s designed to be flat) into the dam. Basically, any water entering into our farm will have a very long journey before it exits. From the north-east corner, our highest point, across the entire farm several times before exiting at the south-western corner into the swale drain along the roadside.
The reason I refer to carnage is due to the appearance. To most eyes we have butchered and ruined 20 acres of great pasture. To us, we are beginning to develop a truly sustainable farm.