UPDATE: spoke to my local NRCS guy and appreciate that advice and he had a lot of good info.

He said without coming to do a field test that what he was looking at for my property I have about a 10 or so acre watershed. However, I know I do get a lot of water I'm capturing coming across.

He gave me some varieties of Bermudagrass seed to use in the area and advised I try to find some hay (bermuda if possible) to cover after I broadcast seed. Spoke to him about the creek and may be a good option, but I'll need to do a water quality test of course.

I've been given a quote on some pond sealer that from my own independent research along with contractor's reference seems like great stuff, but not cheap at all! Totally unexpected cost and most irritating aspect of this whole project.