Digging Swales

I have marked out some sizable swales on my land of two acres. I would like to hire someone with a tractor(not sure of the term) to dig the swales. Can I hire your average trencher or should I seek someone who specializes in permaculture earthworks? I am in Eastern Colorado.

Thank you.

the most acurate mechanical way is an excavator rental with a tilt wrist bucket, next is a plain excavator, after that a bulldozer and lastly a backhoe. It's not that it can't be done with a tractor, it's just your going to take longer, be less accurate and more likely to mix topsoil with subsoil.
You can rent an excavator guy all you have to do is discuss and stress that it's an uncompacted contour berm and he should know what your talking about n start asking why is it uncompacted if it's a contour berm. A trencher is way too narrow and your going to have to chase the dirt, I'm not sure what clips geoff lawton has online for swales but if you'd like i could find some links to that and dam building with geoff just so you can see how the machine works the land when its being built.

Any links would be helpful, I haven't seen a specific link that details the mechanics of digging a swale. Thank you Saybian.

if you go to youtube and search for swale digging click the fourth link to a buncha people chopping at sod. At least on my youtube if you look to the links on your right the top link has allot on harvesting water the permaculture way.