The best way to build ponds and then fill them is by restructuring the flow of water so it runs along the key-line and finds its way to the pond slowly.
Ripping the ground up actually will not do what you want in the end (loose soil that is friable) as well as planting things like winter cereal rye, winter barley, winter wheat and yellow, red, crimson clovers.
Allowing these to grow to maturity will not only loosen the soil, they will also add
carbon and nitrogen to it, making the process far less work and without the dangers of erosion.
when the tall,
straw producing cereals have headed out, press them down so the clovers can take over and add nitrogen, when those are fully grown, turn the whole lot under and plant food crop plants.
Soil building is something that takes time, just like restoring land does. When you want to restore land start with managing the water and the last thing to do is build the soil.
Trees are a good second step.
For the purpose of restoring the land, the quick and dirty (easy) methods are not usually the best methods.
I have seen many people go this route only to find out they have locked themselves into a system very similar to "Big Ag" techniques.
Try a few small areas and then decide which way you want to restore the land.
Redhawk