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Another version of the ‘warm water freezes before cold water tale.’ If moving water does not freeze, then climbing frozen waterfalls is a waste of time or magic. Did the water fall stop in order to let it freeze? Was it frozen in a waterfall mold and applied by climbing supply con-men?
The fact is that water freezes as a coat upon a cold object, then more water freezes on the cold ice until it all freezes. Either that or rivers never freeze over; yet an industry existed getting ice slabs from rivers to store for later seasons, olympic champions train on frozen rivers, and armies crossed to reach objectives.
Water will not freeze if a heat source keeps it over the freezing temperature, so a device to keep fresh water over 32F or zero C would help. It is less expensive to let water drain from the pipe and apply heat to the storage vessel to keep water from freezing in it. Then the air relief valve and vacuum breaker kept warm by close attachment to the 40F heated tank and covered by an insulated shed can continue to operate without ice preventing their operation. Warmed water flowing back to the lake from the vessel will thaw residual ice from the pipe. Pre-insulated pipe can help in this design.