HomeMy WebLinkAboutCC 9 WTR HYDRAULIC SYS 11-04-91AG E uN&z*
CONSENT CALENDAR NO. 9
11-i4-91
OCTOBER 29, 1991 ' `!
WILLIAM HUSTON, CITY MANAGER
PUBLIC WORKS DEPARTMENT/WATER DIVISION
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I U-1,1 t=�: = CITY WATER SYSTEM HYDRAULIC NETWORK ANALYSIS MODEL
RECOMMENDATION:
That the Tustin City Council at its meeting of November 4, 1991, authorize staff to solicit
proposals for the preparation of a computer hydraulic network analysis model of the City's water
system. Funds are currently available in the 1991-92 FY Budget.
BACKGROUND:
The recent Water System Storage Evaluation Study indicated several shortcomings in the City's
water system. The Study cited, among other things, deficiencies in storage capacity, booster
station capacity (between zones and for new storage), groundwater supply, and transmission
mains.
DISCUSSION:
In order to accurately define the above deficiencies it is necessary to conduct a comprehensive
hydraulic analysis model of the existing City pipe network. This analysis will provide
information relative to inadequate main size, high and low water line presisure velocities and
head losses, and flows through various pipes in the system. In addition, the hydraulic model
is a useful tool in determining new transmission mains, well size and locatio0s, and areas of the
City's system which are inadequate in meeting fire flow demands.
The addition of new reservoir storage and booster stations, as recommended by the Study, would
make it necessary to look closely at the size of the existing transmission lines in their proposed
vicinities. Staff is aware that larger pipelines are currently and will be needed in the future to
improve the efficient distribution of water throughout the City's system. The computer model
will confirm the validity of the choices of pipe location and size.
The model will also be capable of analyzing and predicting the interaction (flow and pressure)
between the City's three pressure zones, and the ability or inability to adequately convey water
between them.
Bob Ledendecker
Director of Public Works/City Engineer
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Michael Martin
Water Service Engineer