SDC Methodologies
SDC Methodology
The methodology for the SDC fee is intended to promote the objective that future developments system users will contribute an equitable share of the cost of existing facilities and the cost of increasing capacity of new capital projects.
The Transportation System Development Charge (TSDC) Methodology is based on a system-wide cost per trip, where the cost associated with meeting future growth needs are divided by the projected growth. The methodology includes both improvement and reimbursement TSDC components.
Development of the TSDC includes the following basic steps:
- Determine growth in trips
- Determine growth share of system costs
- Calculate the system-wide costs per trip
- Develop the TSDC rate
City Engineer Directive for use of ITE Trip Generation Manual, 11th Edition
The memorandum link below provides policy directive to City staff regarding Transportation SDC Methodology Section 4.2 "Assigned Trip Generation Rates."
The methodology used to calculate the Parks and Recreation System Development Charge (PSDC) is determined by estimating the cost of capacity from future capacity-enhancing projects to serve new development and estimating capacity in the existing Parks system to be used by new development. All parks and facilities types in the Parks system are considered in the basis for the charge.
The PSDC methodology includes the following steps:
- Determine the growth capacity needs
- Determine the PSDC cost basis
- Determine the system-wide unit costs
- Develop the PSDC rate
Please see the Parks and Recreation System Development Charge Methodology for details.
PSDC applies to residential and nonresidential developments.
The SSDC is comprised of an improvement fee and a reimbursement fee, as new development will require the construction of additional system capacity as well as the use of available capacity in the existing system. The per unit cost of additional capacity for the improvement fee is based on the value of the system-wide capacity of the future capacity-enhancing projects divided by the total projected impervious surface area that will be added by new development at build-out in the Urban Growth Boundary.
Please see the Stormwater System Development Charge Methodology for details.
The SSDC applies to residential and nonresidential developments
WSDC Methodology
The Wastewater System Development Charge (WSDC) methodology is based on a combined reimbursement and improvement structure. The reimbursement fee is based on the value of available capacity in the system to serve growth and the improvement fee is based on future facility costs associated with providing growth's additional capacity needs (above what is already available).
The WSDC fee is charged on residential and nonresidential development.
SDC Methodology Review
Rate adjustments occur periodically to review and update each system’s rate structure to ensure equitable cost recovery for the city’s increased capacity needs.
SDC rate adjustments between comprehensive system methodology reviews/updates to account for changes in construction costs and system valuation are based on adopted construction costs index.