No rule or regulation in this Chapter contained or hereafter enacted touching the supply of water from the City waterworks to private persons shall be construed as in the nature of a contract in such a sense as to prevent the Council from altering or amending the same or from establishing such additional regulations as may from time to time be found necessary; and the Council reserves the right to make such changes or additions at its discretion. (Ch. 79, 1-1-1922)