John, welcome, on behalf of the club!

What water sources will attract bees, and whether that's something we can influence, is mysterious to me. I've got a little fountain in the front yard, and for my first couple of years of beekeeping, the bees really went for it. I enjoyed that. I like to sit by this fountain, eating or reading. It was nice being surrounded by bees who weren't interested in me one way or the other, just thirsty. Then they quit drinking there. I have no idea why, or what they've found that they like better!

I'll try to roust other members who can contribute more!

One thing I wonder about the pond: Is there any sign that bees are drowning in it? Or do they cling to the sides? One consideration important to many approaches to giving bees water, is ensuring that they don't drown. Their vision won't dependably tell them whether they're about to land in a thin film of water, or something deeper. Many solutions incorporate improvised floats or rafts for the bees to land on. Others use something the bees can get down into as the water dries up, like a shallow dish with marbles in it. Searching will turn up many variations. A fountain or water feature with a thin layer of water running over a surface might help.