The city reserves the right at any time to shut off the water in the mains in case of accident or emergency, or for the purpose of making connections, alterations or repairs, and the Director of Public Services shall make reasonable effort to notify all consumers within the district to be shut off at least one hour previous to the shutting off, except in case of accident or emergency, in which case the water shall be shut off without notice.
(`90 Code, § 20-8)