HomeMy WebLinkAbout; MASTER PLAN FOR PUBLIC WATER SYSTEM; MASTER PLAN FOR PUBLIC WATER SYSTEM IMPROVEMENT DISTRICTNO 2 - WEST OF EL CAMINO REAL; 1975-02-05WOODSIDK/KUBOTA A ASSOCIATES, INC.
2965RooseveltSt. .P.O. Box 1095'Carlsbad, California 92008 • (714)729-1194 February 5, 1975
Board of Directors
Carlsbad Municipal Water District
6480 El Camino Real
Carlsbad, Calif. 92008
Subject: Master Plan for Public Water System
Improvement District No. 2 -
West of El Camino Real
Gentlemen:
We are pleased to submit herewith our engineering report entitled
"Master Plan for Public Water System - Improvement District No. 2 -
West of El Camino Real". This
of two separate authorizations
Study" and the "Frank H. Ayres
to the initiating of these two
our recommendation, authorized
report for the entire area of
of El Camino Real.
project represents a combined study
, namely the "Poinsettia Avenue Area
& Son Properties Study". Subsequent
separate studies, the Board, upon
the development of one comprehensive
Improvement District No. 2 westerly
Briefly, the report identifies in detail the extensive and substantial
public water system that we envision will be required to match the
needs of the various land uses as set forth in the latest land use
plan adopted by the City of Carlsbad. As expected, there was a sub-
stantial increase in pipeline capacities and reservoir storage re-
quirements over the current operations, which to date have served
well the predominant agricultural activities.
We recommend that the District and all interested parties review this
proposed master plan in detail and we invite any comments, suggestions,
and questions. After thorough review and evaluation the District
should consider the formal adoption, modified as necessary, so that
it will serve as a viable reference as new development activity and
public water system expansion continues.
^-Very truly yours
^ JYK/le
In Oranaa County, Sente Ana
/Jack Y. Kubota, District Engineer
LCarlsbad Municipal Water District
WOODSIOK/KUBOT* « ASSOCIATKS. INC BBB WOOD
IS MASTER PLAN
FOR
PUBLIC WATER SYSTEM
IMPROVEMENT DISTRICT NO. 2 - WEST OF EL CAMINO REAL
INTRODUCTION
The Carlsbad Municipal Water District developed an extensive
arterial water system in 1959 to bring to the area of Improve-
ment District No. 2 its first public water system. Immediately,
the entire area became very attractive to agricultural interests
and irrigated agriculture soon covered the rolling hills and
fertile valleys. Throughout most of the 1960's agriculture
predominated in the sector westerly of El Camino Real but
urbanization commenced in the early 1970's.
In particular, the area of the Poinsettia Avenue interchange
with 1-5 Freeway and the "Schuyler Ranch" has come under new
development so that a detailed evaluation of the public water
system became apparent with the changing land uses and attendant
water system requirements. Likewise, the Frank H. Ayers and
Son properties had been completely "master-planned" for urban
development resulting in the need to study the water system
requirements for that area.
Accordingly, the District authorized two separate engineering
studies to analyze the overall system requirements and the
relationships with other fringe areas. On the basis of detailed
work on the two studies a determination was made that an overall
study for the entire area of I.D. No. 2 westerly of El Camino
Real and southerly of Palomar Airport Road was the most effective
way to pursue the project. It is timely that this project was
authorized and pursued as the recent development activities
has raised a number of issues as to the practical plans for
providing compiete water service to the residences, commerce,
industry, and the public facilities.
With the completion of th'i s study the entire area of I.D. No. 2,
with the exception of a small portion of the Bressi Ranch and the
La Costa North area, has been given a detailed engineering
evaluation for the updating of the master plan of public water
system originally developed and adopted in 1959. It is fortunate
that the District has been able to adhere to the overall goals
of that original master plan and to have the opportunity to
observe closely development trends so that the current updating
of the plans can be effective to accommodate the i mmedi ate
water service requi rements and the projected needs of the
developi ng areas.
WOODSIDK/KUBOTA « ASSOCIATKS, INC.
We acknowledge the generous assistance and cooperation of the
Planning Department of the City of Carlsbad, who provided all
of the input for land use, zoning, and population projection.
In addition, the Fire Department and the Engineering Department
of the City of Carlsbad assisted in the determination of
practical levels of water service demand and development needs.
II. SCOPE AND PROCESS OF STUDY
The limits of the study are as shown on the "Master Plan for
Public Water System - Improvement District No. 2 - West of El
Camino Real" area on the map marked "Exhibit B", an attachment
to this report. This area, in general, consists of those lands
lying between Palomar Airport Road on the north. El Camino Real
on the east, Batiquitos Lagoon on the south, and the Pacific
Ocean on the west. The topography of the area is made up of
mesas penetrated by deep valleys running northerly and southerly
and by lower mesa lands between 1-5 Freeway and the Pacific
Ocean. The total area that is under consideration is approxi-
mately forty-two hundred (4,200) acres and the land elevations
range from sea level to an elevation of 384 feet.
The land use and population in the a rea was determined from the
City of Carlsbad's Land Use Plan. Population was calculated
using the maximum allowable density for each particular area.
The operating pressures within the study a re a were redefined and
new pressure zones proposed. These zones a re set using current
development trends and California Department of Public Health
guidelines. The minimum allowable pressure has been set at
40 psi and a maximum allowable pressure of 125 psi. The minimum
pressure may be as low as 20 psi under fire flow conditions and
the maximum pressure may be higher under low flow or static
conditions.
The hydraulic parameters upon which the study is based are
consumption data based on District records and previous studies
within the District of 170 gallons of cons urnption per capita
per day. The maximum daily consumption per capita was set at
twice the average daily consumption of 170 gallons or 340 gallons
per capita per day. A peak hour demand was estimated to be
twice the maximum daily consumption or 680 gallons per capita.
Pipe sizes we re calculated using the maximum day plus fire flow
or peak hour demand, whichever was greater.
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WOODSIOK/KUBOTA « ASSOCIATES. INC
mt
Water consumption for open spaces, commercial and institutional
(schools) areas was assigned an annual factor of 2.5 acre feet
per acre. Water consumption within industrial areas was
assigned an annual factor of 3.5 acre feet per acre with the
exception of the Palomar Airport Business Park which has a
fixed flow of 2,000 gallons per minute as determined at the time
this industrial subdivision was approved.
The estimated fire flows were determined with the guidance of
the Fire Department of the City of Carlsbad utilizing current
Insurance underwriter's requirements based on a prediction of
the type of construction that will be used in the area. The
subject fire flows are summarized in Table I of this report.
Water main size was determined using a maximum velocity within
the pipelines of 8 feet per second and a minimum pressure of
40 psi, except during fire flow conditions when residual
pressures of 20 psi are allowed. The maximum flow in each of
the pipelines was based on the maximum daily consumption plus
the required fire flows or peak hour demands, whichever is
greater. In addition, the pipelines a re sized so that head
losses due to friction will not result in pressure reductions
below those previously stated. Maximum operating pressure
has been set for 136 psi except in industrial a re as where higher
pressures are allowed. This high pressure represents a maximum
pressure at static conditions and will occur in the 318 zone at
sea level.
III. LAND USE
The study area consists of lands that are within the City of
Carlsbad and lands that are within the County of San Diego.
The City of Carlsbad adopted a Land Use Plan on August 16, 1974
by City Council Resolution No. 3527 and this Land Use Plan
includes all of the area within this study and as shown on
"Exhibit A" of this report. The principal land use designations
of res 1 den ti al, commerc ial, recreational -comme rcial, parks and
schools a re shown on "Exhibit A". In addition to this Land Use
Plan, there are various approved tentative maps and recorded
subdivision maps in the a re a. Where available, this detailed
in format ion was used to make the study more definitive and
preci se.
Those areas that are presently developed and where there are
•mt approved tentative maps and tract maps, the exact densities as
shown on these maps were used in the computation of the popu-
lation for the a re as. The population was estimated on the
basis of an average of 2.9 persons per dwelling unit. The 2.9
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WOODSIDK/KUBOTA A ASSOCIATES. INC-
persons per dwelling unit is the factor the City of Carlsbad
Planning Department currently uses in estimating populations
on a city-wide basis irrespective of the particular type of
development; i.e. condominium, single family residences or
multiple residential structures. For those areas where there
was no Information other than the Land Use Plan, the population
and density estimates were made using the maximum densities as
shown on the plan.
Based upon the Land Use Plan and utilizing the 2.9 persons per
dwelling factor, the ultimate population is estimated to be
58,000 people. Table II is a summary of the projected
population and land use
IV. EXISTING DISTRICT FACILITIES
The District maintains and operates numerous existing pipelines
within the study area. These existing pipelines are shown on
the attached "Exhibit B".
In addition to the pipelines, the District presently has two
above-ground reservoirs that are located at Elevation 384.
These reservoirs a re known as D-1 and D-2, Improvement District
No. 2, These reservoirs have a combined capacity of 2.5 million
gal Ions .
The study area receives its water from a 20" connection to the
27" pipeline in Palomar Airport Road at Its Intersection with
El Camino Real. The 20" pipeline continues southerly in El
Camino Real for approximately 6,300 feet. An 18" pipeline runs
to the west from El Camino Real to the D-Reservoirs. A 12"
pipeline continues south In El Camino Real to La Costa, In
addition to these lines in El Camino Real, there is a 16" pipe-
line that parallels the 20" in El Camino Real from Palomar
Airport Road to the south boundary of the Carlsbad Business
Park. This 16" pipeline will be continued in the future as
shown on "Exhibit B". The above described pipelines bring the
water supply into the area. In addition, the District has
numerous major pipelines that distribute water within the areas
as shown on "Exhibit B".
The study a re a is currently served by two pressure zones. High
pressure water for the area in 664 hydraulic gradient water and
the remaining area is serviced by 384 hydraulic gradient water.
The District operates two Pressure Regulating Stations; the El
Camino Real Pressure Regulating Station and the "D" Reservoir
Pressure Regulating Station.
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' III
• WOODSIDK/KUBOTA A ASSOCIATES. INC •• PROPOSED ARTERIAL WATER SYSTEM
The study area Is currently served by two pressure zones. It
was necessary that the pressure zone definition in the area be
redefined and new pressure zones established that meet current
development trends and State Department of Public Health
guidelines.
The study area was divided into three pressure zones. The
pressure zones are as listed in Table III and the exact areas of
these zones are as shown on "Exhibit B". Zone I is served by
water having a hydraulic gradient of 318 feet and the elevations
within Zone I vary from sea level to an elevation of 120 feet.
Zone II is served by water having a hydraulic gradient of 384
feet and the elevations of the land served by this water is
from 120 feet to 260 feet. Zone I and II are served by the
reservoirs as shown on "Exhibit B". Zone III is served by
hydraulic gradient water of 550 feet and the elevations served
are 260 feet to 384 feet. The areas within this pressure zone
do not have local storage and are dependent upon high pressure
water from the San Diego County Water Authority's aqueduct and
Squires Dam in times of emergency although Squires Dam will not
supply water of the 550 foot gradient. The 550 foot zone could
drop to 475 at the static conditions since the active storage
zone in Squires Dam is Elevations 475-505 feet. These pressure
zones can be varied slightly and accordingly the pressure
reducing stations as shown on "Exhibit B" may be relocated
depending upon the type of grading operations of specific
developments within the various areas.
The El Camino Real Pressure Regulating Station will be relocated
and enlarged in the vicinity of the Intersection of El Camino
Real and Alga Road. The Pressure Regulating Station at D-Reser-
voirs will remain and be enlarged as necessary when additional
storage capacity is constructed. A major pressure reducing
station in this system will be located at Palomar Airport Road
and El Camino Real. This* pressure re due ing station will reduce
pressure in the existing 20" line in El CamIno Real that goes
south from Palomar Airport Road as well as paralleling the 16"
line that has been construe ted on the west side of El Camino
Real. These pressure reducing stations will be constructed with
sustaining features so that they will maintain a minimum upstream
pressure and utilize the maximurn capability of the storage that
is required at the D-Reservoir site.
"Exhibit B", attached to this report, shows the proposed arterial
pipeline system for the study area. Section VI of this re port
entitled "Storage Requirements" will demonstrate that all of the
storage for the area is limited to two sites that are within
2,000 feet of each other. This eliminates the need for duplicate
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WOODSIDK/KUBOTA A ASSOCIATES. INC
pipelines to supply individual reservoirs that could be located
at lower elevations. As a result, economy will be realized
since the necessity of providing two lines in the same area
has been minimized to two locations in the Pressure Zone III.
Pressure Zone III has been kept to a minimum of area to keep
the necessity for double lines and those areas that will not
have local storage to a minimum.
The minimum size and number of arterial mains and loops are
shown on "Exhibit B". The size of the mains and the spacing
of the loops depends entirely on localized demand and fire flows.
Since fire flows are expected to be a minimum of 1,500 gallons
per minute in the residential areas to a maximum of 6,000
gallons per minute in the commercial and industrial areas, the
line size that is proposed for arterial mains is ,12" and the
spacing is at one-half to three-quarters of a mile intervals.
In this way all of the required quantities can be delivered
without excessive veloci ties.
The type of structures that are proposed to be constructed are
unknown, however, we assume there will be normal single family
residential construction and condominiums with no more than
two stories and meeting Fire Department requi rements for the
fire flows listed for each density and land use as shown on
the Land Use Plan. If, in the future, high rise construction
or any other high-density type construction is allowed, the
fire flows and demands may change substantially and pipeline
capacity into those areas would have to be re-evaluated at that
time with respect to the adequacy of the sizing of the pipe and
the supply available. This is also the case within industrial
and commercial areas if high water use industrial and commercial
establishments are allowed and there may be a requirement for
on-site storage or some other means to satisfy peak water demands
as we 11 as possibly their fire flow requi rement due to extremely
1arge structures.
This arterial system will provide for a flow of 2,000 gallons
per minute at the Palomar Airport Road metering station for
supply to the City of Carlsbad service area (Terramar). The
City of Carlsbad's total flow requirement in the Terramar area
has been estimated at 5,000 gallons per minute. The additional
flow requirements to the City of Carlsbad will be handled by
other connections which come from the east in the a re as northerly
of Palomar Airport Road.
The proposed arterial system is a plan for major transmission
facilities only. Each development will be required to build
local distribution mains that are appropriately looped and
meet the design criteria of the District and the Fire Agency
having jurisdiction. The exact location of these major facilities
may be changed to conform with proposed road alignments and
local subdivision streets.
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HHH WOOD: WOODSIOE/KUBOTA A ASSOCIATES. INC
VI . STORAGE REQUIREMENTS
The study area has been divided into three pressure zones as
shown on "Exhibit B". The existing D-Reservoirs have the
capability of serving Zones I and II. Zone III cannot be
supplied by the existing reservo1rs or any new reserve 1rs
that must be constructed. Storage for Zone III must be
provided by construction of storage in another area and the
storage requirements must be Included in studies of the
surrounding area in the future.
The Pressure Zones I and II will be supplied by the existing
D-Reservoirs and additional storage to be constructed in the
future. Zone I and II will have a maximum population of
49,000 people based on the Land Use Plan, The storage require-
ments for this population is a total of 17.0 million gallons
which is equal to one maximum day of water usage.
The District presently has 2.5 million gallons of above ground
storage at the existing D-Reservoir site. This site Is not
large enough to accommodate 17.0 million gallons of total
storage. There is, however, a site approximately 2,000 feet
to the south of the 0-Reservoir site that can accommodate the
District's sto rage requi rements. There are several options
for meeting storage requi rements open to the District, Among
these options are the following:
1. There is sufficient room for the construction of two
additional 1.25 million gallon re servoirs on the
existing site. The additional 12.0 million gallons
will be constructed at the new reservoir site.
2. The District may construct two more 1.25 million gallon
reservoirs at the existing site and construct two
6 million gallon reservoirs at the new site.
3. The District may use the existing 2.5 million gallons
of storage at the "D" site and construct 14.5 million
gallons of sto rage at the new site. The 14.5 million
gallons may be constructed as one reservoir or as a
7 million gallon and 7.5 million gallon reservoir or
other similar combination of sizes totaling 14.5 million
gallons.
4. Construct the entire 17.0 million gallons of storage at
the new proposed site and remove the existing D-1 and
D-2 reservoi rs.
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• HI WOOD!
n
WOODSIDE/KUBOTA A ASSOCIATES, INC
With the exception of Alternate No. 4, the District may phase
the construction of the requi red storage as the area develops.
In the event the total population is less than the maximum
projected, the District will not have to construct the entire
additional 14.5 million gallons of sto rage, if the construction
is phased. A detailed analysis of these options will have to
be made at the time additional storage is requi red.
VII. SUMMARY AND CONCLUSIONS
The original "Master Plan for Public Water System - Improvement
District No. 2" has served well the variety of agricultural acti-
vities and the early stages of urban development. The recent
completion of the Land Use Plan by the City of Carlsbad has
permitted a level of study and analysis so that all of the
public water system facilities can be developed in concert with
the up-to-date planning and zoning. The appraisal of the public
water system requirements based upon today's measure of design
and standards has resulted in a basic arterial water system,
which should adequately serve the area as urban development
set forth in the current Land Use Plan takes place.
Our analysis and evaluation of the adopted Land Use Plan resulted
in a population projection of some 58,000 residents within the
4,200 acre study area. In addition, there is a potential of
commercial, industrial, and vast open spaces and public facili-
ties identified in the Land Use Plan. Taking into account the
projected water demands for these activities and the important
factor of fire flows, detailed engineering analysis has yielded
the various design flow requirements and elevated storage require-
ments for the entire study area.
The proposed Master Plan as set forth in this report is intended
to represent the public water system utilizing to a maximum the
existing pipeline capacities, storage reservoirs and appurtenant
faci1i ti es.
VIII. RECOMMENDATIONS
1. The proposed Master Plan for Public Water System should be
thoroughly reviewed and evaluated by all interested parties
including the various property owners and governmental agencies,
who have a substantial interest in the entire study area.
We will be witnessing a substantial increase in development
activities in the next several years to come, so that it is
important we have continuing participation and input from
all interested parties.
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WOOD
tfHOIHKKIIB
WOODSIDE/KUBOTA A ASSOCIATES, INC
411.
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2. After a suitable period of time of review, the plan should
be formally adopted by the Board of Directors subject to
those modifications as deemed appropriate.
3. The District should consider the integration of the various
master plans for the sectors of Improvement District No. 2,
as well as integration of Improvement District No. 2 with
the entire District water system as a whole. Because of the
interdependence of the various reaches in terms of pipe-
line capacity, pressure regulations and storage require-
ments, it is imperative that there be full continuity within
all reaches of the District. /
4. Inasmuch as land use planning is active and viable, the
District should monitor closely any significant trends for
the modifications of the plan upon which this study is based
Stated another way, a master plan, such as this, should be
reviewed at least every two to three years, based upon the
activities that have occurred.
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HHH WOOD WOOOSIDE/KUBOTA m ASSOCIATES. INC.
•HBIMBBHa
TABLE I
FIRE FLOW REQUIREMENTS
LAND USE
1 . RL - Low Dens 1ty
2. RLM - Low Medium Density
3. RM - Medium Density
4. RMH - Medium High Density
5. Commercial - Residential
Shopping Center
6. Commercial - Industrial
Regional Shopping Center
FIRE FLOW
1500 - 1750 gpm
1750 gpm
2500 gpm
3000 gpm
3000 - 4000 gpm
4000 - 6000 gpm
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HHH WOOD WOODSIDE/KUBOTA A ASSOCIATES. INC
BHoiMBaa*
LAND USE
AREA
IN ACRES
TABLE II
LAND USE SUMMARY
MAXIMUM DENSITY
UNITS/ACRE
TOTAL
UNITS
MAXIMUM
PROJECTED
POPULATION
RL 95 1.5 143 415
RLM 1 ,458 4.0 5.793 16.800
RM 1 ,205 10.0 9,563 27,732
RMH 330 20.0 4,555 13,208
RH 30.0
RRI - - -
RRE - ^ _
RS -
C 23
N 24
TS 7
RC 33
CBD
E 20
J 43
H 68
HC
P
0
PI 399
G 30
V 14
OS 434
NRR 17
TOTAL 4,200 20.054 58,155
NOTE: Population and total
approved developments
units have been adj us ted to Include
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BHH WOODSIDE/KUBOTA A ASSOCIATES, INC
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IMPROVEMENT
WEST OF EL
MASTER
FOR
DI STRICT NO. 2
CAMINO REAL
PLAN
y
?H
PUBLIC WATER SYSTEM
CARLSBAD MUNICIPAL WATER DISTRICT
PREPARED BY:
WOODSIDE -KUBOTA & ASSOC.
'
CONSULTING ENGINEERS
CARLSBAD, CALIFORNIA FEBRUARY 1975
NOTE : CONNECT
ADOPTION BY BOARD OF DIRECTORS: RESOLUTION NO. 342 APRIL 7, 1976
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