I agree with the clover, ask your local seed and feed store and see which of the white clovers grows best in your area. I will water mine in Aug and maybe Sept if we are in a drought. You have the water to do it from the pond. Clover will also bring in the deer if u like that kind of stuff, which I do. And you can water the seed now or wait till mid Sept to seed before the fall rains.
Tracy