Can't answer the first question, but I learned how to bass fish in a clear water gravel pit with 15'+ visibility. The fishing is far better at dusk, dawn, and night. Another great condition is rain or wind, the more the better as it limits the amount of light penetration. The biggest bass that I have seen was caught in the middle of a rain storm during the middle of summer. Good lure choices are baits with a lot of action, like swimbaits, 10" ribbon tail worms, jerkbaits, Topwaters, etc. all work well. The bass usually (but not always) are a little deeper than normal because of the amount of light penetration and the weeds grow much deeper, which helps keep the oxygen level up in the deeper areas. Another thing is that you should always keep a sight fishing lure tied on in clear water, at least in gravel pits you can sight fish in fifteen feet of water. I usually use a trd as you can deadstick it in front of there faces till they bite, and it can do just about anything to match the fishes mood.
Anyway, I fished this morning before the storms came in for about five and a half hours. For the first three and a half hours I threw a pop-r at rip rap banks working it very quickly for the active bass because of the approaching storm. It caught 38 bass, most were again just little 13-14 inch bass but it was till fun seeing them blow up on the bait. Only six bass were over fifteen inches.
Then for the remainder of the time I forced myself to put down the pop-r and just use a savage gear line thru trout. I hooked three bass and had five followers. I only landed one nice ~20 inch fish because the drag on my reel decided it couldn't tighten past about three pounds of pressure, so I had to thumb the spool to make up for it. Even with that it was extremely hard to get a good hook set though, so I guess I am going to have to find the cash to get another reel. I have no idea how that could happen, It used to get tighter than that but it is an old reel. I still figured if the drag was going to go it would altogether lock down or be on permanent free spool.