Dig a hole with your tractor if you have a low spot. My latest one was 10 x14 in size and it did not hold water so I added a rubber liner from Menards. I agree that a kiddie pool would not get used heavily as the deer seem to slowly adapt to them or a tank. The fact that you have creeks has little to do with them using the waterhole. Waterholes are primarily a social gathering spot in my opinion as NoFo has stated in other threads. Every deer on my property and the neighbors visit my waterholes on a regular basis from my camera evidence. I've seen larger deer numbers this year at the waterhole and I know they aren't all staying on my property.