I would think typical slope is 4:1, just my opinion. I did 3:1 and find that pretty slick when it's wet in our clay area. Actually, I'm 150 ft across and 18 ft deep, in some fantastic Cameron Texas clay. In S Texas, deeper is better if your recharge is only runoff. Our droughts and hot summers can eat up the water pretty fast.
Where's South Central Texas?, anywhere near Cameron?. I see the clay in the picture, red clay, must be closer to Houston?.
Overtons fish hatchery near Jewit can help you with some good starters.
That dozer looks familiar, it's not Ted and his brother doing this job, is it?.
Pray for rain, you got allot to fill, good luck.
