Like DoDad, when I finally get around to installing my float valve, it would be in my skimmer/pre-filter reservor. When my water level drops, that's where it drops. I have to check the skimmer reservor daily to see if I need to add water to the pond. The skimmer/pre-filter reservor is where my submersible water pump is also, and I can't let the water level drop down to the water pump for obvious reasons.
The only problem I have is running a dripline to the pond. The location of the pond and the closest water faucet is a logistical problem. Foundation, side walks, and the hook up.
Happy ponding,