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June 2017
4-5
City of Morgan Hill
Water System Master Plan
landscape irrigation, agricultural irrigation, industrial processes, and potable reuse. As part of the
RWFE, infrastructure required to convey recycled water from the South County Regional
Wastewater Authority (SCWRA) Wastewater Treatment Plant (WWTP) in the City of Gilroy to the
potential users was identified.
Based on the results of the RWFE, which included a technical and economic feasibility evaluation,
the City elected to not pursue the development of a recycled water system at this time. However,
the City is continuing to explore options for the purpose of utilizing recycled water within the City.
As opportunities arise, funding sources for implementing a recycled water program should be
evaluated.
4.4 PRESSURE ZONES
The City’s current water system serves land ranging from approximately 320 feet above sea level
to more than 1,100 feet. To adequately provide water in this service area requires the creation of
multiple pressure zones that operate with varying pressures between 45 and greater than 100 psi.
Figure 4.3
shows the boundaries and names for these pressure zones.
The City’s supply, and a majority of the service connections, are located in the Nob Hill and Boys
Ranch pressure zones. Several gate valve interconnections between the Nob Hill and Boys
Ranch pressure zones exist, which allow water to transfer between the zones; under typical
operating conditions these gate valves remain closed.
4.5 WATER DISTRIBUTION PIPELINES
Groundwater is pumped into the City’s distribution system via more than 175 miles of pipeline. As
the City’s sole source of supply is groundwater, which is distributed throughout the domestic water
system, there are no dedicated transmission systems in the City. The pipelines are generally 24-
inches and smaller, and convey water to the consumers’ service connections.
An inventory of existing modeled pipes, extracted from the GIS-based hydraulic model and used
in this analysis, is included in
Table 4.2
. For each pipe diameter, the inventory lists the length in
feet, as well as the total length in units of miles.
4.6 STORAGE RESERVOIRS
Storage reservoirs are typically incorporated in the water system to provide water supply for
operation during periods of high demand, for meeting fire flow requirements, and for other
emergencies, as defined in the City’s planning criteria.
The City’s existing storage reservoirs are summarized in
Table 4.3
, along with their volumes,
construction year and type, height, diameter, bottom elevations, and overflow height and
elevations. These reservoirs are also shown on the hydraulic profile schematic (
Appendix B
),
with the HWL and bottom tank elevations.