out in the fields i dont think about the thermals. when i get back into the hills you definitely need to pay attention to thermals. Air moves up during the day, falls down the hills at night. Thermals can be quite strong at night.
Indeed, same goes for the water trapper alongside "hills." I trap out of a boat where I can, drag an otter sled where I can't.
In minky locations with sloping bank above, I use a 3" auger to drill a chimney that meets the back end of a small diameter pocket that extends back a ways. Bait gets pinned to the very back end of the pocket, just behind the confluence with the vertical shaft. Drowner cable runs to terminal end in sufficient depth that is shared with another cable to a blind set nearby, but not too close to avoid entanglement.
Pocket cable has two drowner locks on it. First lock is hooked up to a #1 coilspring back in the pocket, as far back as the chain will allow. Second lock connected to a #11 that guards the entrance with chain tight to the lock slid down the cable towards the terminal end, but snugged into the bottom to avoid the 'coon lifting it up.
Cooling night air flows downhill, down the chimney, and out the mouth of the pocket. Often I have two critters at the terminal end from the pocket, both submerged and dispatched. Sometimes three with the blind set connecting.
Sounds like a lot of foo foo rah for this version of the elbow set. Having your drowner cables all prepped and ready to use at the site is advantageous. The proper pocket shovel can dig that narrow tunnel out quickly, providing you have that kind of bank to work with. I use an older Trapper Art's round shovel. And the 3" hole above can be knocked out quickly too. This set can be dug out and waiting prior to your setting it up, if you have that kind of time. In the right situation, this set will be there from one season to the next providing a 'coon doesn't destroy it or flood waters alter the bank.