City of Morgan Hill Water System Master Plan 2017

June 2017

5-1

City of Morgan Hill

Water System Master Plan

2017

City of Morgan Hill

5.0

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

5.2 FUTURE DOMESTIC WATER DEMANDS

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.

5.3 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