EXECUTIVE SUMMARY
The City of West Jordan (City) has completed the 2019 Sanitary Sewer Master Plan Update (Plan). This Plan targeted the following items:
• Data Collection - Incorporate updated survey data for new developments.
• Update Existing Model - Update the InfoSWMM hydraulic model based on new survey data and include current sanitary sewer flows. Create a calibrated model to utilize in the future.
• Evaluate Buildout Scenario - Create a buildout scenario that will identify capacity issues for which the City will need to prepare.
• Capital Improvement Plan (CIP) - Prepare a CIP to be used by City staff for future planning purposes.
Previous master plans studied the sewer trunk lines in arterial roads, groundwater infiltration, and provided survey and model data for the major roads. The 2012 Master Plan provided comprehensive survey and modeling data for each manhole and pipe throughout the City, including individual neighborhoods. This Plan provides an updated existing model that includes the areas that have developed since 2012, an estimate of future growth based on the City's Land Use Plan, and the required sewer capacity to meet the per capita wastewater demand for this growth. The location and size of new pipelines were studied, modeled, and mapped, as were improvements to the existing sewer system under the CIP.
A Geographical Information System (GIS) based computer model (InfoSWMM) was used to evaluate the existing and future pipe collection systems. The computer model incorporates Global Positioning System (GPS) surveyed manhole and pipe elevation data collected by the City for each manhole and pipe in the City's sewer system. The current West Jordan population density from census data, and the current land use map were used to evaluate sewer usage per person for existing residential areas and to project future sewer use in undeveloped areas. Water use records from water meters were used to estimate existing commercial and industrial sewer usage. The existing sewer model was calibrated by comparing observed flows in several locations throughout the City with model output data for each location; model flows calibrated to within +/- 5% of the observed flows.