(A) For the purposes stated in §§ 53.10 and 53.11, there is hereby assessed a storm water service charge to each user in the district who contributes directly or indirectly to the storm water system of the district, in an amount defined below.
(B) The DSM hereby establishes that an equivalent residential unit (“ERU”) shall be based upon 3,225 square feet of impervious surface area.
(C) All properties having impervious surface area within the district shall be assigned an ERU, or multiple thereof, with all properties having impervious area assigned at least one ERU excepting contiguous residential properties as defined in this section.
(D) The storm water service charge for one ERU is hereby established at $3.00 per month. The total service charge for a particular property shall be determined by taking the number of ERUs assigned to a particular property and multiplying it by $3.00.
(E) Residential properties. A monthly flat rate charge for storm water service rendered to residential properties shall be charged to each account within the district. All residential properties are assigned one ERU. This flat fee shall apply to all residential properties as defined herein.
(1) Contiguous residential properties having common ownership and sharing a single structure containing four or less dwelling units may be assigned one ERU.
(2) Contiguous residential properties having common ownership, one of which contains a dwelling building, and the remainder of which contain impervious surface area but serve an accessory or incidental use, may be assigned one ERU.
(F) Non-residential properties. The impervious surface area of each non-residential property shall be individually calculated. Non-residential properties shall be assessed a monthly rate for storm water service based upon the total number of ERUs that encompasses the measured impervious surface area on the individual property. The calculation to determine the total number of ERUs for a non-residential property shall be completed by dividing the total square footage of measured impervious surface area for a property by 3,225 square feet. The division shall be calculated to the first decimal place. Total ERUs shall not be less than one for any non-residential property containing measurable surface area.
(G) Only whole ERUs shall be used in determining the assignment of gross ERUs to a property. All rounding necessary to reach the appropriate whole ERU shall be done according to mathematical convention (0 - 0.4 rounded down to the nearest whole ERU; 0.5 - 0.9 rounded up to the nearest whole ERU).
(Ord. 2013-9, passed 11-12-13; Am. Ord. 2014-3, passed 2-10-14)