Myron Platte wrote:
Good question! It, of course depends. Generally, however, I would prefer on-contour big swales. They are really good at spreading moisture evenly between the ridges and the valleys, and storing it under the ground. They are a whole-landscape solution. Fishscale swales are more for creating a concentration of moisture at one spot.
R Scott wrote:Larger swales are easier to build and manage…with machines.
There can be minor differences in how long it takes water to infiltrate due to how deep the swale gets into the subsoil and volume vs surface space.
But the biggest question is how you plan to use and manage it afterwards. If you want to mow it with a machine, large swales have advantages but if you plan to scythe or leave it natural then micro swales are great.