In this chapter, terms such as “monthly,” “per month,” “any one month” or similar terms regarding a monthly time period mean a thirty-day period with respect to all services except for flat rate service. Accordingly, charges and rates based on metered water consumption and charges and rates with respect to other non-flat rate services are always prorated based on a thirty-day period. Charges and rates with respect to flat rate service, such as the monthly surface water management service charge for single-family residences, are not prorated. For flat rate service, the entire monthly charge is due for each month, regardless of how many days flat rate service is used in a calendar month and regardless of the number of days in a calendar month. (Ord. 3417-14 § 8, 2014.)