It shall be the responsibility of the user to conserve water and prevent waste, to preserve an adequate supply for all users and to prevent soil erosion and damage to sidewalks, curbs and streets. Water used for irrigation shall be applied through approved sprinkling devices. The waste of water through open hose or open faucets, leaky faucets or flush valves, roof sprinkling, or allowing any water to discharge or flow onto or across any sidewalk, street or alley is unlawful.