Keep the Faucet Open all Night.
Although it may seem wasteful, during freezing nights, leaving a little trickle of hot and cold water running from a sink or bathtub faucet will help keep water flowing through the pipes and prevent them from freezing and breaking. It is something that the plumber in Carlsbad would advise, mainly if your sink or bathtub’s water supply pipes run along an exterior wall and are, therefore, subject to the coldest temperatures. Refrain from letting the sink overflow and cause the flood you were trying to avoid by closing the drain.
It may be possible to turn off the water at the main shutoff and drain the pipes in times of emergency, such as when local water supplies are low, and conservation is necessary.