Tackle:
Rod: Your standard 9ft 5Wt trout set up will be perfect and is my preferred rod. It can handle bigger flies and still cast reasonably well if the wind picks up (which it does as the dam is rather exposed). A 5Wt can also handle a bigger bass but is not too heavy and the smaller fish still provide you with good fun. Your 10ft Vaal rod will also do perfectly! Most importantly, take a rod that is light and that you feel comfortable casting all day long, trust me you will be doing a lot of long casts (no short-line nymphing here). If you want to have some good fun with the bass, bring a 3wt as well. However, this will seriously hamper you should the wind pick up. I do sometimes carry a second heavier rod with me, just in case the barble or carp make an appearance. In this case I like a 7wt with a floating line, strong enough to pull bigger fish, but not too heavy to carry around or cast for extended periods (slapping for barble).
Reel: Don’t fuss too much about the reel. My preference is large arbors with a smooth drag, no need to worry about backing capacity. Make sure you have spare spools or multiple reels to carry both floating and sinking lines.
Lines: Your bread and butter line is going to be an intermediate line. You can use a Di 3 but I prefer the intermediate as it allows you to control the depth the fly fishes at better. This allows you to fish a fly with a slower retrieve over submerged structure, which the bass often love. Also pack a floating line for the morning and afternoon top-water action and for when the yellows make an appearance.
Leaders: For the intermediate line I prefer a 6-7 ft self-made twisted leader of either 12 or 10 lb maxima ultragreen. This truns the bigger streamers over easier, but you could easily substitute this with a level section of 12 to15lb maxima. To this leader I add a 2ft section of either 10 or 8lb maxima for a total leader length of between 8 to 9 ft. On the floating line, a standard 9ft 2x tapered leader is perfect and 2 to 3ft of 8/10lb maxima tippet can be added for fishing poppers. If the wind is up you can use the 9ft leader without adding tippet to help turn the poppers over better.
Other: I would highly recommend using a stripping basket of sorts when walking the banks and wade fishing. This will just make your life so much easier when moving from spot to spot and will help you cover water quicker and prevent the sinking lines from tangling in weeds or getting damaged on the rocks. If you are walking and wading the banks, I would highly recommend a lightweight comfortable pair of water shoes with soles that are strong enough to walk on the sharp rock banks but still walk long distances (I can highly recommend Columbia’s boat/water running shoe).