City of Morgan Hill Water System Master Plan 2017

redeveloped using InfoWater, a GIS-based hydraulic model also by Innovyze. The model has an intuitive graphical interface and is directly integrated with ESRI’s ArcGIS (GIS).

ES.8 PRESSURE EVALUATION The calibrated hydraulic model was used for evaluating the system pressures throughout the distribution system during peak hour demand, maximum day demands, and maximum day demands in conjunction with fire flows. Criteria for pressure and fire flows were also summarized in the System Performance and Design Criteria chapter. Since the hydraulic model was calibrated for extended period simulations, the analysis duration was established at 24 hours for analysis. The hydraulic model indicates that the City’s existing distribution system performed reasonably well during the pressure evaluation, with few exceptions noted in the Evaluation and Proposed Improvements chapter. ES.9 SUPPLY AND STORAGE EVALUATION Existing and future supply requirements were identified for the City, which is required to be able to meet the maximum day demand of the existing system with firm groundwater well capacity. Based on the City’s existing groundwater well firm capacity, the City is capable of meeting the existing maximum day demand; based on the anticipated future growth, the City will be required to construct two new wells by the buildout of the General Plan. Existing storage requirements were identified for each existing pressure zone and included the operation, fire, and emergency storage components. The total City-wide required storage for existing domestic water demands is calculated at 8.7 MG. Future storage requirements were identified based on the anticipated future growth, in each existing and future pressure zone, and will require an additional 3.3 MG of operational and emergency storage capacity. ES.10 CAPITAL IMPROVEMENT PROGRAM The Capital Improvement Program costs for the projects identified in this master plan for mitigating existing system deficiencies and for serving anticipated future growth throughout the City are summarized on Table ES.3 and are graphically represented on Figure ES.3 . The estimated construction costs include the baseline costs plus 30 percent contingency allowance to account for unforeseen events and unknown field conditions. Capital improvement costs include the estimated construction costs plus 30 percent project-related costs (engineering design, project administration, construction management and inspection, and legal costs). The costs in this Water System Master Plan were benchmarked using a 20-City national average Engineering News Record (ENR) Construction Cost Index (CCI) of 10,532, reflecting a date of January 2017. In total, the CIP includes approximately 9.8 miles of pipeline improvements, two new wells, five new storage reservoirs, two new booster stations, a new pressure reducing valve station, as well as other plan updates and currently planned projects, with a project cost totaling over $48.4 million dollars.

June 2017

ES-8

City of Morgan Hill Water System Master Plan