Pond Boss Forums INTRO Questions & Observations Best depth ratio for a small pond?

In a little more than a week, I should be hiring a contractor to dig me a pond. Depending on the digging conditions and how far my budget last, I am hoping to dig a 1 1/2 acre pond. I pretty much have an idea and a plan in mind, but I am unsure of the various depths ratios I should dig. I do not want weeds to take over the pond, but I do want some shallow areas for the fish to breed. I am thinking about having a shallow area of 3-4 feet and the deepest area 8 feet. I am also planning to add a couple mounds and trenches. Here are my questions. How much of the pond should be 8 feet and how much should be 3-4 feet deep or what is a good ratio between the deep areas and the shallow areas? Secondly, will the bigger bass hang out in the deeper water or do they prefer the shallow areas?