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June 2017
ES-8
City of Morgan Hill
Water System Master Plan
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.