I can actually do one better than that, though I haven't gotten around to actually DOING it yet. I've got two different satellite images of the lake, one just as the neighborhood was going up around it. My plan is to print one of these images onto lined graph paper to give me a grid to work with. Then figure a way to calculate the real-world distance represented by one square, and take depth measurements at every intersection... Maybe once it's not so doggone hot!
