CC 1999 12-09CITY OF POWAY, CALIFORNIA
MINUTES OF THE CITY COUNCIL
ADJOURNED REGULAR MEETING
DECEMBER 9, 1999
The December 9, 1999, adjourned regular meeting of the City Council of the City
of Poway, was called to order at 6:00 p.m., by Mayor Cafagna at the City Council
Chambers, 13325 Civic Center Drive, Poway, California.
COUNCILMEMBERS PRESENT AT ROLL CALL
Bob Emery, Jay Goldby, Don Higginson, Mickey Cafagna
COUNCILMEMBERS ABSENT AT ROLL CALL
Betty Rexford
STAFF MEMBERS PRESENT
James Bowersox
Penny Riley
Tamara Smith
Niall Fritz
Jim Howell
Deborah Johnson
Javid Siminou
Patti Brindle
Brad Kutzner
Ken Quon
Gary MacPherson
Mike Hubert
Jennifer Johnson
City Manager
Deputy City Manager
Assistant City Attorney
Director of Development Services
Director of Public Services
Director of Redevelopment Services
City Engineer
City Planner
Senior Civil Engineer
Senior Civil Engineer
Safety Services Division Chief
Safety Services Division Chief
Management Analyst
PUBLIC ORAL COMMUNICATIONS
Mayor Cafagna explained the procedure for Public Oral Communications. There was no
one present wishing to speak.
ITEM 1 (1170-10)
INFRASTRUCTURE MASTER PLANS
Mayor Cafagna welcomed those in attendance. City Manager Bowersox provided a brief
introduction on the intent of the workshop.
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Development Services Director Fritz, introduced Senior Civil Engineer Kutzner who made
a verbal presentation covering the following:
STEPS IN THE MASTER PLANNING PROCESS
1. Create map of existing system.
2. Create mathematical model of system.
3. Develop list of user demands, based on land use, to be applied to system.
4. Apply demands to existing system and compare results to known per[ormance of
existing system (calibrate model).
5. Identify future growth (General Plan).
6. Apply model to future needs.
7. Analyze difference between future and existing system.
8. Estimate costs to construct needed facilities.
Kutzner then presented a brief description of each system and some of the
assumptions and parameters being used in the process. All three Master Plans use
Poway's General Plan as the controlling element.
WATER MASTER PLAN
I. Water Demand Uses
"Domestic" use.
Fire flow.
2. Domestic Use
Largest use in total.
15,000 small uses.
Changes with time of day, season of year, weather conditions, etc.
Water Treatment Plan sized at 24 MGD to accommodate these uses.
3. Fire Flow
Highest peak flows.
Generally defines pipe size and reservoir needs.
Varies with building type and activities in building.
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4. Water Demand Use MaD
Not same land use as General Plan.
Represents water demand by land use type.
These demands are applied to model to let us see effect on our water system.
5. Water System
Entire system is gravity fed.
Water is pumped to reservoir, then flows by gravity to users. Reservoir creates
"pressure zones." Elevation difference between reservoir and user - pressure too
large elevation difference = too much pressure.
Sometimes too much elevation difference between reservoir and user - too much
pressure. We install pressure reducing stations to lower pressure.
6. Existing Water System
Works very well (few problems, great delivery).
Modeling (and experience) show few weak pressure areas.
Ultimate system will minimize this, probably not eliminate it.
7. Future Water System
Build on good existing system, continue same level of service to new customers.
Not all areas of City will receive public water. Limited by practical, physical,
economic forces:
Elevation
Distance from existing service.
Density of users.
All affect cost of extending waterline.
Maps were created to ESTIMATE probable service limits. The map shows two
things: open space (generates no demand); and private property beyond practical
service limits.
WASTEWATER MASTER PLAN
I. Sewer Demand Factors
Driven by users needs.
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Residential and commemial fairly predictable, routine.
Industrial is user specific. Model must "average" flow by land use. Often individual
users must do special study to determine effects of their use on public system. May
generate need to increase size of existing system.
Master Plan uses General Plan and conservative flow projections. So far, this has
proven adequate.
2. Sewer System
Gravity system, generally
Four lift stations in City's system Two outlets from Poway: Penasquitos Creek
Outfall and Rancho Bernardo Winery (minor portion).
Gravity drives system into two parts:
- North basin (north of Pomerado Hospital and Poway High School).
- South Basin (south of these same points).
North basin collected at Camino Del Valle Lift Station and pumped back to
gravity lines near Pomerado Hospital to south basin.
Additionally, we have four points where sewer flows from San Diego pass into Poway.
These are metered as they come in and as they leave Poway.
3. Existing System
Works very well.
About to begin the modeling and calibration process.
There are many areas in developed neighborhoods that don't have sewer service now.
4. Future System
For Planning purposes many of the more densely populated areas are being
modeled as needing wastewater service in the future. There is no guarantee this
will happen, but the system is being designed to accommodate this should it occur.
Again, there are limits being assumed to the area which will be served. These are shown
on the map in the agenda packet. Economics will drive the limits.
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STORM WATER MASTER PLAN
I. "Demand Factors"
This term is used very differently in storm drain analysis.
Intensity of land use, the amount of impervious surfaces created under
development, is what is being modeled.
Several nature factors also play a major role in storm water modeling (soil type,
slope, size of stream beds, etc.).
2. Existing System
Currently being compiled.
Mapping shows most, but is still under development.
Maintaining open channels and pipes is a major challenge because they don't carry
clean, predictable water. They carry a lot of debris and sediment and they erode
and move. This is a dynamic system. Every rain storm is different, and the system
has to handle a wide variety of conditions.
3. Future System
The ultimate configuration will be a balance of public health and safety protection
and environmental sensitivity and private property rights.
The current Master Plan utilizes detention basins, natural and man-made channels
to convey storm runoff. The new Master Plan will too.
Since the last Master Plan was done, many changes have occurred. The General
Plan has undergone several revisions. The County's Hydrology manual and Design
Rainfall Events have been increased, many more storm drain facilities have been
installed and much of the developable land has been occupied. Therefore, in the
near future, there won't be wholesale development-driven changes to the storm
water system. Most changes will be led by the City.
4. Implications
What this will mean is that the guidance provided by this Master Plan will assist the
City in making some crucial decisions to handle storm runoff and protecting its
citizens and businesses.
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As always, this will be done to try to achieve the maximum protection for the least
cost practical.
Detention basis location and sizing will be one of the key elements in this process.
The overall goal will be to maintain or improve on the previous planned level of
protection.
We have several currently in place and expect this Master Plan to provide
opportunities for several more.
SUMMARY
This process will give Council and staff great tools to work with as they lead Poway into the
next century with a very good idea of what the infrastructure needs will be.
Staff responded to questions of the Council.
ADJOURNMENT
Mayor Cafagna adjourned the meeting at 6:42 p.m. on motion by Councilmember
Higginson, seconded by Deputy Mayor Emery.
Lor{ Anne Peoples, Cit~ Clerk
City of Poway
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