The CRP can ruin your runoff. When 200 acres of farm land here in west Tx was taken out of cotton and put into CRP 20 years ago the 16 acre tank went dry and stayed that way. Land is now out of CRP and the tank is half full and stocked.
I was on the property when the pond was being constructed and after it was finished. I seriously doubt that SetterGuy will have a big difference in water runoff going to his pond if he puts that field into CRP. I think the CRP might even help mitigate the sediment that runs into the pond from that field.
BINGO... this CRP holds soils, reduces runoff speed by slowing it down, yes, but when it slows down, sediment falls out and what does come on through is less likely to be "hot" nutrient water. The entire original purpose of CRP was to control erosion when it was the "soil bank" program.
That's also what the WRE program is for around wetlands...keep the water, stop the siltation problem-it works very well.