Well, if I am looking at that correctly, and I understand it's purpose, it is so the hydrants do not need to be shoveled out. I would have many concerns.
If there is a lot of packed snow around the hydrant there may be a freezing problem when the hydrant is needed.
If the hydrant is buried, only the large discharge is available and the other outlets are not. The large discharge is typically used when a pumper attaches to the hydrant with a short piece (15 feet) of soft suction hose to pump increased pressure/volume to other pumpers located closer to the fire.
The two side outlets are usually used when a pumper drops a line (hose) on the way in to a fire scene and that pumper might drop 300 to 500 or more feet of line before they get to the fire scene. That supply is crucial because most pumpers carry 500 to 1000 gallons of water and that can run out pretty quickly. Then you are relying on a secondary supply, such as the hydrant.
So, in my experience it looks good but in real life it may have a very limited use.
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