BrianH,

I can't speak much for dam construction but I do some dirtwork in the DFW area and a lot of times we will rent water trucks or water tanks to manually wet our soils down before placing it and compacting it. This may be an option. You can probably rent these items in your area. I don't know all of the rental places around Hico, TX but you may start by talking to the guys at Brett Construction in Hico or RECS Rentals in Glen Rose. Or you may have other water sources that may be cheaper to use.