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can check the water quality in the reservoir even when parts of the river are frozen.
have to wait until the ice melts in spring to check the quality of the drinking water.
had no way to check water quality before they had under-ice buoys.
use under-ice buoys to prevent water from being delivered to the treatment plant.
The correct answer is: had no way to check water quality before they had under-ice buoys.
Explanation: Under-ice buoys allow for monitoring of water quality even when the surface is frozen, providing a solution to check the drinking water quality throughout winter, rather than waiting for the ice to melt. This technology was developed specifically to address the challenges posed by winter conditions.