Pursuant to Section 66483 of the Subdivision Map Act, the drainage fees set out in said Local Area Drainage Fee Map adopted by action of the Board of Supervisors shall be paid for subdivisions within the PLD areas established herein.
The drainage fee shall be the lesser of the following:
(a) The product of the gross area of the subdivision in acres and the fee rate (dollars per acre) for the particular local drainage area as set forth in the Local Drainage Area Fee Map. If the proposed subdivision lies within two or more local drainage areas, the drainage fee shall be the sum of the product of the acreage within each Local Drainage Area and the fee for each area; or
(b) In the case of residential subdivision only, the product of the fee rate and the number of approved dwelling units within the subdivision.