How difficult is it to dig a ditch

[fitz19d]

Or actually more like a small retention pond or whatever else one would suggest. Can maybe get my dads kybota out here, or else rent. Or break down and pay if it's more complicated than I thought. From our home inspection, I knew this would need to be addressed. Couldnt go out, so not sure if there's someplace good to drain to, so I'm assuming some kind of retention. (Maybe would hold enough water to become a 2nd pond and maybe put to some kind of good use? Summertime fish farming?

But trying to decide on what kind of price to ask on a concession for it.