what i did was put 3 dump truck loads in my lake.i put 2 loads on the north side of the lake and put 1/4 loads in different locations.i cannot tell the difference in one spot vs the other.my gravel starts in about 1 foot or water and goes to about 5 feet.i have noticed the larger bass/bream use the 5 foot section more than the smaller fish.one other thought is i find the 1 foot water holds most of the smaller bream and no bass.