For single family residential uses, the Stormwater SDC is a set rate. Multi-family and nonresidential uses are charged a fee based on the equivalent residential units (ERU) for the property. ERU are established by multiplying the property's area range number (ARN) by its development intensity factor (DIF). ARN and DIF are identified in Resolution 04-47.
Oregon Revised Statutes (ORS) 223.297 to 223.314 provides "a uniform framework for the imposition of system development charges by governmental units" and establishes "that the charges may be used only for capital improvements." An SDC can be constructed to include one or both of the following components: