How are stormwater monthly charges calculated?

Stormwater rates are based on your Equivalent Residential Units (ERU). Each residential unit, (apartment, duplex, townhouse) is considered 1 ERU. Non-Residential property rates are charged based on the following calculation:

ERU = Lot Area÷2500 × Development Intensity Factor (DIF)

DIF is based on the type of use and is specified in the Oregon City Municipal Code 13.16.

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1. How are stormwater monthly charges calculated?
2. What types of projects will the stormwater rate increases include?