Not mine, but interesting:
Killington needs to move somewhere around fifteen million gallons of water onto Superstar for the World Cup (based on 200k - 250k gal per acre foot, 5000' trail length, 150' width, 2.5' depth).
In super marginal conditions they can still get at least 3000 gallons per minute onto that trail (60,000 CFM at a 25:1 air to water ratio - this doesn't factor in any low E gun or the fans at the base and assumes the training run soaks up 12000 CFM of their estimated 72,000 available CFM), for a time to completion of 83 hours of runtime. They can move around 10,000 GPM if they get to run wide open, but I doubt they manage to flow everything they have on Superstar. Still, 8000 GPM means they finish in just 31 hours of prime weather.
Note that Superstar is just about all manual and mostly portable land guns - it'll lose production during startup and shutdown and because the guns won't all be tuned just right. It also has to cure and be winched out, the course set, and possibly treated with urea or water injection - all that takes extra time.
But Killington just needs it to go their way, weather-wise, for three or four days of around-the-clock snowmaking ending a handful of days prior to the anticipated start day. Or a week's worth of cold nights with a couple lows around/below 20. However you get to 83 hours.
Credit goes to IceEidelon on Alpine Zone.
