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June 2017
ES-3
City of Morgan Hill
Water System Master Plan
Figure ES.1
displays the planning area showing city limits, the Urban Growth Boundary of the
City and the City’s Sphere of Influence Boundary.
ES.4
SYSTEM PERFORMANCE AND DESIGN CRITERIA
This report documents the City’s performance and design criteria that were used for evaluating
the domestic water system. The system performance and design criteria are used to establish
guidelines for determining future water demands, evaluating existing domestic water facilities, and
for sizing future facilities.
Table ES.1
documents the system performance and design criteria for
the domestic water system. This criterion was used in the capacity evaluation and for sizing
recommended improvements.
ES.5
EXISTING WATER SYSTEM OVERVIEW
The City’s municipal water system consists of 16 active groundwater wells, a total of 10.5 million
gallons in storage, distribution mains, and fire hydrants. The City’s topography is generally flat in
the center of the City with increasing slopes on the east and west; based on this topography, the
water distribution system is comprised of 20 pressure zones, with 12 storage tanks regulating
system operation.
The City’s existing domestic water distribution system is shown in
Figure ES.2
, which displays the
existing system by pipe size. This figure provides a general color coding for the distribution mains,
as well as labeling the existing wells and the storage reservoir.
ES.6
EXISTING AND FUTURE DOMESTIC WATER DEMANDS
The City’s existing average day domestic water demand was documented at 6.4 mgd. Accounting
for losses in the system, the average daily production is 7.2 mgd.
Table ES.2
documents the
future land use categories, and their corresponding domestic water demands. The average day
domestic water demands from existing and future developments is estimated at 9.4 mgd, and
parallels the 2035 water demand projections documented in the 2015 Urban Water Management
Plan. These demands were used in sizing the future infrastructure facilities, including transmission
mains, storage reservoirs, and booster stations. Demands were also used for allocating and
reserving capacities in the existing or proposed facilities.
ES.7
HYDRAULIC MODEL DEVELOPMENT
Hydraulic network analysis has become an effectively powerful tool in many aspects of water
distribution planning, design, operation, management, emergency response planning, system
reliability analysis, fire flow analysis, and water quality evaluations. The City’s hydraulic model
was used to evaluate the capacity adequacy of the existing system and to plan its expansion to
service anticipated future growth. The City’s previous model was developed using Innovyze’s
H2OMAP, which utilizes a GIS interface and uses the effective EPANET hydraulic engine for
processing the hydraulic calculations. As part of this master plan, the hydraulic model was