Infrastructure Cost Model
The iMPACS infrastructure cost model was developed during Blueprint as one of many measures to compare growth patterns in the SACOG region. iMPACS estimates needed infrastructure based on development scenarios as modeled in I-PLACE3S. The infrastructure components that are modeled include culinary and secondary water, waste water treatment, dry utilities, roads, and parks.
The outcome of the analysis shows a substantial savings in the cost of providing services such as water, sewer, roads, flood control, drainage, parks, and dry utilities; the region could save $13.8 billion if it built the Preferred Alternative rather than the Base Case over the next 50 years. More than half of this savings would result from having to purchase far less land to mitigate the consumption of agricultural and habitat lands. The remaining savings result from the need for less infrastructure to serve the same number of residents and employees. Converting this result to Equivalent Dwelling Units (1 dwelling = 1 EDU; 2,500 sq. ft. of employment = 1 EDU), there is a cost savings of $18,000/EDU.
SACOG is upgrading the model to account for the costs associated with public services such as fire and police. The analysis capacity will be further enhanced by linking estimates of cost with estimates of revenue to cover those costs annually. A study was conducted by SACOG during the early phases of Blueprint implementation to estimate the revenue the adopted scenario would generate, and how that compared to the base case scenario. The work stemming for that analysis is the foundation for comparing costs with revenue for fiscal impacts analyses. The fiscal impacts analysis will identify any gaps in funding, which can then be addressed through additional revenue sources or a change in infrastructure-generating land use patterns.