City of Morgan Hill Water System Master Plan 2017

2017 City of Morgan Hill

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CHAPTER 5 – DOMESTIC WATER DEMANDS

This chapter summarizes existing domestic water demands, identifies potential recycled water demands, and projects the future domestic water demands.

5.1 EXISTING DOMESTIC WATER DEMANDS

The existing water demands used for this master plan were based on the City’s 2012 water billing consumption records as well as total annual production. The existing water demands in this analysis are adjusted to match the annual production records and account for system losses. The existing demand distribution, by pressure zone, was obtained from the water billing records. Using GIS, each customer account was geocoded to its physical location within its existing pressure zone. The accounts were then sorted by pressure zone and the total demand in each zone was calculated. The City’s existing average day domestic water demand, as extracted from the water billing records, were lower than the total demands listed in the annual production records due to system losses that occurred between the groundwater wells and customer service connections. The total domestic water demands were increased proportionally to 7.2 mgd to reflect the total 2012 production and account for transmission main losses. The existing domestic water demands, for each pressure zone, are summarized on Table 5.1 . Future demands were projected using the unit factors for residential and non-residential land uses and included the developments within the Urban Growth Boundary. Table 5.2 organizes the future land use categories and their corresponding domestic water demands. It should be noted that the existing domestic water demands in Table 5.2 were calculated using the recommended water unit factors, which take into account future water conservation practices, and are intended to represent the water use of the existing users at the buildout of the master plan horizon. The total average day domestic water demands from existing and future developments is calculated at 9.4 mgd. These demands were used in sizing the future infrastructure facilities, including distribution mains, storage reservoirs, and booster stations. Demands were also used for allocating and reserving capacities in the existing or proposed facilities. Table 5.3 summarizes the buildout water demand for each pressure zone. 5.2 FUTURE DOMESTIC WATER DEMANDS

5.3 RECYCLED WATER DEMANDS

In 1977 SCVWD, the City of Gilroy, and Gavilan Water Conservation District embarked on a partnership to construct and operate a recycled water system extending from the South County Regional Wastewater Authority (SCRWA) Wastewater Treatment Plant in southeast Gilroy to

June 2017

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City of Morgan Hill Water System Master Plan