You are judging a Junior HT. You go to water. Due to thick brush and extremely narrow openings, the only access to the water for gunners and handlers is on the same side of the pond very close together with the wind blowing into your face (headwind).
1. What do you think a duck will do when thrown into the wind?
2. Do you do a flyer and dead bird or would you choose to do two dead birds? And why?
3. Just to complicate matters, both live birds and dead birds are wet. What problems does this cause?
There are numerous variables that come into play.
1. how skilled are your gunners?
2. Do you have wingers to launch flyers and or dead birds? Do you have boats and other equipment available?
3. If the birds are wet, the live birds will float better even if they've been out in the rain. Reusing a wet dead bird is likely a sinking mess the minute it hits the water.
When thrown into a stiff wind, the birds will likely fly pretty well, but controlling where they go will be difficult for most throwers. Using a winger to launch the flyer will get the control needed for better placement and a fresh shot bird will float higher in the water
You can dispatch the live birds just before use and toss them from the shore. These will still float better than soaking wet birds shot earlier in the day.
In all honesty, I would not use the pond you described. If nothing else I would look for a puddle in a field to run the dogs through. (It's raining isn't it?) While putting dogs through a pond is nice, there is no requirement for the dogs to swim in a water series, they only need to get wet. Then I could set marks under conditions appropriate for Junior dogs.
Use the conditions at hand to your advantage.