The existing system was analyzed using the state recommended 100 gpcd. This was utilized as the current LOS to be consistent with future loading. The existing piping system capacity is generally adequate under these conditions; however, there are a few areas that need relief due to over- capacity or that are approaching capacity. Modeled system capacity for each pipe in the model are presented in Figure 6-1 (See Appendix A for the large-scale figure). The observed deficiencies are as follows:
• 1300 West
- The 1300 West 10-inch pipeline from 8600 South to 8200 South, then south of 9000 South is at capacity, due in large part to infiltration from groundwater into the sewer laterals, pipes, connections, and manholes.
• Grizzly Way
- The 12-inch pipeline in Grizzly Way from Swift Water Way to 7800 South is at capacity because of the large area that has developed upstream of this location.
• Campus View Drive
- The 8-inch and 10-inch diameter pipes in Campus View Drive are at capacity due mainly to the high-density residential development that is in the area.
There are various other isolated short segments of pipes (shown as red in Figure 6-1) throughout the system model that may be experiencing capacity problems or may have invert elevation or pipe size data that needs to be updated. These localized areas need to be investigated further with field monitoring to confirm if they are problem areas.
