Watering donkeys near your property draws more donkeys around the Village and making that many more of them down the hill, where there is no fencing. That donkey warning sign on Waikoloa Rd, just makai of Paniolo is there because donkeys have been sighted in that area for some time. They are down around the Fire Department, too.
Plus providing water to them near your yard is keeping them away from the safe capture point where donkeys are captured and removed from the Village. That is the solution. Let it work.
Please see previous posts on the subject of "water".
Please, pass this word around: don't water the donkeys. The donkeys don't need it and while it might keep them out areas of your yard, it has delayed the WVA's relocation efforts.