I would really like to get a transit or laser level at some point in time to take quick measurements across a distance and to validate our A-frame, but all the work up to this point has been done with a simple homemade A-frame.
I built it out of cedar 2" x 2" 's so it is lightweight and easy to work with and made the spacing between the legs 1.5m / 5' mainly because this is the width of the front end loader on my Kubota. This will make sense later on
I pick a staring point for the swale, generally near the estimated middle of its path, and start "walking" the A-frame across the land. Every time I take a step with the A-frame, I put a flag in by the A-frame leg.
I move out in both directions until I have my proposed path. This generates a very detailed line across the property, usually with a couple of outliers due to depressions or other disturbances.
I generally "smooth" out these outliers if they are only 1 or 2 flags in length and try to normalize the path while still following the natural layout of the land.
Now the fun part...
I position my
tractor on the up/hill side of the swale, tilt the
bucket at about a 45 degree angle, and line up the cutting edge of my front end loader with the first 2 flags in my path.
I dig in about 1/2 of my bucket depth and gently tilt the bucket to push this soil over onto the berm side.
Then back up and line up the bucket with the edge of your last cut and the next flag in the line. It is magically spaced at a buckets width
Keep up this process until you have the entire swale roughed in.
I generally go back and take a few more cuts at each position to sprinkle some dirt on top of whatever organic matter was growing on top and to make the entrance edge a little more shallow.
That is pretty much it. It took my wife and I about 2 hours to layout, mark, dig, and rake out a 45m / 150' swale. This includes discussing the exit path, carrying rocks in for the overflow, and enjoying the day...
I will post our planting lists next post.