When you open the lid the water will run freely into(and out of) the trough.
You need to shut off the pipe above the trough when filling the reservoirs.
What kind of waterers are you using now....and how many birds do you have?
You'll need a shut off valve for when you refill the reservoirs above.
Could work, put it somewhere that won't be catastrophic if it overflows.
How far from the house will all the pipe have to run?
How many birds do you have?
Does it freeze where you are?