Brett
Used an existing dam, and only backing up a few feet of water. 2 1' pipes drain to creek first and emergency spillway will drain if they fill...I hope. Note: this was orginally a 1/2a pond we cleaned and enlarged. Used same spillway location as when first built. This area (western Wilson Co.) south of San Antonio has excellent clay to 30'. We did have to pack a small sand spot in old channel.No soil waste. Built a 150x150' pad on hill overlooking. Pad was dug to 10' to get to clay on clay. No drain, 3 Honda pumps.
best of luck.
