HomeMy WebLinkAbout1980-03-04; City Council; 5775-1; Water Master Plan for NE of City of CarlsbadCITY OF CARLSBAD
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AGENDA BILL NO. 5775 - Supplement #1 _ Dept. Hd.^X
DATE: March 4, 1980 _ C. Atty.V/$g
DEPARTMENT: Utilities & Maintenance _ C. Mgr.
Subiect- ACCEPTING WATER MASTER PLAN FOR THE NORTH-EAST QUADRANT OF THE
CITY OF CARLSBAD
Statement of the Matter
Council approved an agreement with Woodside/Kubota & Associates on March 6, 1979
for the development of a WAter Master Plan for the north-east quadrant of the
City. The work under this agreement has been completed and the Water Master Plan
report is submitted herewith. This report completes the work under CIP Project 3067
and funds in the amount of $5,500.00 are available in Fund 51-244-3970 to pay for
this work.
EXHIBITS
A. Report entitled, "Master Plan for Public Water System for the North-east
Quadrant Water Service Area" City of Carlsbad, June, 1979. , v/, ,
RECOMMENDATION
If Council concurs, it should accept the report by minute motion and authorize
staff to pay charges relating to this project.
Council Action:
3-4-80 Council accepted the report and authorized staff to pay charges relating to
the project.
MASTER PLAN FOR PUBLIC WATER SYSTEM
FOR THE
NORTHEAST QUADRANT WATER SERVICE AREA
CITY OF CARLSBAD
JUNE, 1979
WOODSIDE/KUBOTA & ASSOCIATES, INC.
CARLSBAD, CALIFORNIA
MASTER PLAN
CITY OF CARLSBAD
C7902 NORTHEAST QUADRANT
I. INTRODUCTION
The Northeast quadrant water service area for the City of
Carlsbad is an undeveloped section of land bordered on the North
and East by the City of Oceanside, bordered on the South mainly by the
Carlsbad Municipal Water District and bordered on the West by
El Camino Real. At the present time there are no planned develop-
ments in the vacant areas of the Northeast Quadrant. On February 1,
1978, the Carlsbad Municipal Water District (CMWD) adopted a Master
Plan for Improvement District No. 3, North and East of El Camino
Real, by adoption of Resolution No. 369. This plan outlined the
major water facilities to the South of the Northeast study area and
proposed a general layout for Lake Calaveras Hills, a planned com-
munity development of approximately 800 acres. The plan indicates
the general means of distributing the water from the Tri-Agency
Pipeline (TAP) now being completed, into the area. This TAP line
will provide high pressure water into this area and will assist in
eliminating the need of pumping at numerous locations. On March 19,
1979, the City of Carlsbad authorized the firm of Woodside/Kubota
& Associates, Inc.,to proceed to study the Northeast Quadrant and
develop a water master plan for the City water service area East
of El Camino Real and North of Tamarack Avenue. The study was to
include storage facilities, major transmission and distribution
lines and analyze the existing system and provide recommendations
for future improvements to provide integration of the study area in
the City system and facilities to receive water from major trans-
mission works of the CMWD. The study area encompasses approximately
450 acres and has one proposed arterial street, that of Marron Road,
which will traverse the area from East to West. Contacts with City
Staff indicate that there have been no alignments set or no develop-
ments proposed that would set this alignment. The only proposed
development that would have any effect on the study area is that of
the Lake Calaveras Hills for which preliminary plans indicate
treated wastewater effluent storage ponds being proposed in the low
lying areas of their land lying in the southerly part of the study
area. Also it is very timely to coordinate the water system for
the Northeast Quadrant with that of the plan for Lake Calaveras
Hills, the new Master Plan for the Carlsbad Municipal Water District,
as well as identifying emergency connections with the City of Oceanside,
This will all assist in coordinating the overall water needs and
systems and assist in the future phasing of necessary facilities
to provide an adequate water service to all of the Northeast Carlsbad
area.
We acknowledge the generous assistance and cooperation of the
Planning Department of the City of Carlsbad which provided all of
the input for land use zoning and population projections; the Fire
Department for their review of the fire flow needs; the City's Water
Department staff for their valuable assistance in updating maps,
water use data, fire flow test data and running pressure tests as
needed. Rick Engineering-Carlsbad Office, Consulting Engineer for
Lake Calaveras Hills, provided technical data, base maps and the
latest proposed plans for this area.
-2-
II. SCOPE AND PROCESS OF STUDY
The limits of the study are as shown on the "Master Plan for
Public Water System - Northeast Quadrant, City of Carlsbad Water
Service Area", marked "Exhibit A", an attachment to this report.
This area, in general, consists of those lands lying between the
City limits of Oceanside on the North and East, El Camino Real on
the West and the Tanglewood residential development on the South-
west. The topography of the area is mainly the valley of Buena
Vista Creek extending to the mesas to the South. The total area
that is under consideration is approximately 450 acres, but the
study reviews considerable added areas to the South and West to
coordinate existing and proposed water systems. Land elevations
range from elevations of 20 feet to over 300 feet.
The land use and population in the area was obtained from the
City of Carlsbad's Land Use Plan,. Population was calculated using
the maximum allowable density for each particular area. The oper-
ating pressures within the study area were reviewed and compared
with existing and future sources of water and storage. California
Department of Public Health guidelines allow a minimum pressure of
40 psi and a maximum working pressure of 125 psi. The minimum
pressure may be as low as 20 psi under fire flow conditions.
The hydraulic parameters upon which the study is based are
consumption data based on records and previous studies within the
area of 150 gallons of consumption per capita per day for residential
use. The maximum daily consumption per capita is twice the average
daily consumption of 150 gallons or 300 gallons per capita per day.
The peak hour demand was estimated to be twice the maximum daily
consumption or 600 gallons per capita per day. Pipe sizes were cal-
culated using the maximum day plus fire flow or peak hour demand,
whichever is greater.
Water consumption for commercial and institutional (schools)
areas was assigned an annual factor of 2.8 acre feet per acre and
open spaces 3.9. Special consideration was given to large open
space areas as these areas would not be totally watered and peak
flows would not coincide with peak hour flows.
The estimated fire flows were determined with the guidance of
the Fire Marshal of the City of Carlsbad utilizing current insurance
underwriter's requirements based on predictions of the type of con-
struction that will be used in the area. The subject fire flows
are summarized in Table I of this report.
Water main sizes weredetermined using a maximum velocity
within the pipelines of approximately eight 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 was
greater. Maximum pressure has been set for 125 psi at static
conditions.
-3-
III. LAND USE
The study area consists of lands that are within the City of
Carlsbad. 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
"B" in the Appendix of this report. In addition to this Land Use
Plan, there are various recorded subdivision maps and the Master
Plan for Lake Calaveras Hills to the South of the study area. Where
available this detailed information was used to make the study more
definitive and precise.
The population was estimated on the basis of an average of 3.5
persons per dwelling unit for RLM zones and 3.0 persons per unit
in RM zones. The 3.5 persons per dwelling unit is the factor in
general use for low density residential (less than 8 dwelling units
per acre). For those areas where there was no information other
than the Land Use Plans, 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 persons per
dwelling unit factor, the ultimate population for the study area
is estimated to be 6,470 people. Table II is a summary of the
projected population and land use.
-4-
IV. EXISTING FACILITIES
The principal arterial pipelines for the study area are the
Carlsbad Municipal Water District facilities to the South near "B"
Reservoir, and the 10-inch lines in El Camino Real extending North
to the pressure reducing station north of Hosp Way and the City 10"
line in El Camino Real extending from the pressure reducing station
to Marron Road and a 10" line in Marron Road from El Camino Real
to Avenida de Anita. Oceanside has lines to the North and East
that should be connected to the Carlsbad system for emergency pur-
poses. There is an existing Oceanside connection in El Camino Real
at Highway 78 through a 16-inch two-way flow meter. A future con-
nection should be made with the existing 8-inch Oceanside line in
College Boulevard just East of the East boundary of the study area.
These lines are shown on Exhibit "A" an attachment to this report.
-5-
V. PROPOSED ARTERIAL WATER SYSTEM
Eighty-four percent of the study area is in the lower pressure
Zone 3 (0-160 foot elevation) of the City of Carlsbad Water System,
the 16 percent remaining includes about 3 percent in the higher
pressure Zone 1(215 to 353 foot elevation) and 13 percent in the
medium pressure Zone 2 (110 to 230 foot elevation). All of these
higher zones are adjacent to the Carlsbad Municipal Water District
service area where other areas are or will be served by Carlsbad
Municipal Water District. It is impractical for the City of Carlsbad
to serve the higher zone and this should be incorporated in the
service area for CMWD. For the medium Zone 2 area it is possible
to serve it from the adjacent CMWD zone or to incorporate a portion
of it into the City's system depending on which alternate of the
storage is utilized. The Developer of Calavera Lake Estates has
requested that all their area be served by CMWD. The Zone 3 area
adjacent and westerly of the study area is served from the existing
CMWD 10-inch line in El Camino Real and several lines from the Elm
Reservoir. The pressure in this area is maintained at a hydraulic
gradiant of approximately 283 +_ feet in the 10-inch line and the base
elevation of the Elm Reservoir is 254.8 feet. If a new reservoir
is placed at an elevation of 283 or higher it could ride on the
existing system and provide the necessary fire flow and peak hour
storage required for the area. Due to the configuration of the study
area and the projected population,one arterial line in the proposed
Marron Road would provide the necessary water main for the area.
This line could connect to the existing 10-inch line in Marron Road
just westerly of Avenida De Anita to the West and could have an
emergency connection to the Oceanside 8-inch line on the East in
College Boulevard. Its main water source would come from the area
of the existing "B" Reservoir in the CMWD system, a 14-inch line will
meet the minimum requirements of maximum day and 2,500 gallons per
minute fire flow which is the highest projected fire flow required
in the study area for the RM Zone. This system could also provide
added fire flow to the West of the study area.
Higher pressure flows for the City's higher pressure zones
would be obtained through a proposed 14-inch line extending from
the end of the TAP line in the neighborhood of the existing CMWD
"B" line, to the "B" Reservoir, extending westerly in the proposed
extension of Elm Avenue to Santa Clara Way (See Exhibit "A").
This line was proposed in the recent Master Plan for the Carlsbad
Municipal Water District and could feed directly into the Carlsbad
Zone 1 area, now served by pumps from the Ellery Reservoir. Pressure
in this line would have to be reduced from the pressure in the TAP
line to suit the needs of the City. It would be desirable to establish
this pressure with a pressure reducing station at the end of the TAP
line and then run the entire line at the appropriate pressure of
approximately a 480 foot hydraulic grade line. The 14-inch line
-6-
could extend on to Ellery Reservoir or can connect to the existing
system arid a smaller line extend to Ellery. This would backfeed
the existing system.
If added flow is required for areas to the West of Monroe
Street, consideration should be given to enlarging the proposed line
in Marron Road to a 16-inch line which would allow approximately
4,000 gallons per minute to flow to the point of the end of the
existing 10-inch line in Marron Road, besides serving the maximum
day needs at the study area. Existing and proposed lines to the
West would transport this additional flow to the Plaza area.
Additional lines would be required to convey added water West of
Monroe Street.
A review was made of the required flows for the area West of
El Camino Real in Pressure Zone 3, based on total development and
a 6,000 gallon per minute fire flow for the Plaza Camino Real
Shopping Center. This review also considered the proposed 12-inch
line down future Monroe Street a/id the added 10-inch loop lines
within the Plaza. There is ample pressure for the area, but pre-
sently there is a lack of fire flow storage in the Elm Reservoir
and the velocity in several lines would exceed twelve feet per
second.
Theinstallation of a 14-inch line in Marron Road for the
Northeast Study Area would eliminate both of these problem areas
if ample storage is added and added lines are placed as shown on
Exhibit "A".
One suggestion would be the addition of another 10-inch line
from Marron Road to the Plaza 10-inch loop somewhere West of the
existing 12-inch line from Elm Reservoir. The placement of a 10-
inch line from Marron Road at the East end of the existing 10-inch
line to Haymar Drive would provide added capacity to the Plaza
as well as the Von's area, plus serve new development. A parallel-
ing 8-inch line in Marron Road West of El Camino Real would upgrade
the weak link in the system.
-7-
VI. STORAGE REQUIREMENTS
All of the CMWD water transmission mains serving the study
area have been designed on the basis of supplying maximum day
requirements and therefore it is mandatory that storage be provided
to take care of the peak hour and fire flow requirements. The peak
hour requirement for storage is approximately 30 percent of the
maximum 24 hours and for the total study area this would require
660,000 gallons. Fire flow for the area would require 2,500 gallons
per minute for two hours or approximately 300,000 gallons, giving
a total storage requirement of a little under 1 million gallons for
just the study area. If additional storage for the City of Carlsbad
is required, it would be appropriate to add those requirements to
the 1 million gallons. If the fire flow for the Plaza Camino Real
Shopping Center is set at 6,000 gallons per minute for a duration of
six hours the storage requirement is 2.16 million gallons.
Reviewing the Pressure Zone
East of Crest Drive and adjacent
utilizing the required flows for
fol1owi ng resul ts:
3 area North of the Elm Reservoir
to the Northeast study area and
ultimate development we find the
1. Ultimate population
2. Maximum daily flow
3. Peak hour flow
4. Fi re f1ow
5. Fire flow storage
6. Storage for peak hour
TOTAL STORAGE REQUIRED
Existing Elm Reservoir
Storage Needed
6,470
3,030 gallons per minute
5,754 gallons per minute
6,000 gallons per minute
(6,000 gallons per minute for
6 hours) = 2.16 million gallons
30% of 3,030 gallons per minute
for 24 hours) =1.31
3.47 million gallons
1.50 million gallons
1.97 million gallons
Some storage may be available from the 5 million-gallon Ellery
Reservoir, but a determination would have to be made on the storage
needs of other areas of the City, which is beyond the scope of this
report. The fire flows to the Plaza Camino Real Shopping Center can
be considered along with the fire flows to the Northeast area so the
2.16 million gallons can be utilized as the fire flow storage for
both areas. This results in a total storage requirement of approxi-
mately 2.5 million gallons for ultimate development of the two areas,
less any storage at Ellery Reservoir that can be allocated to this
Pressure Zone 3 area.
-8-
There are two possible methods of providing storage, the first
would be the construction of a separate tank by the City of Carlsbad
at a working elevation of approximately 300 feet. It would be
located on the point northerly of the existing "B" reservoir noted
as site "A" on Exhibit "A", and would be capable of floating on
the system serving the lower Zone 3. The second method would be to
include the storage in with the proposed five million gallons in the
CMWD. This would have an elevation of the existing "B" tank of
approximately the 446 foot elevation, then a 14-inch line would need
to be constructed from the reservoir to the North to tie into the
proposed arterial system. This combined storage would be more eco-
nomical in that a five or six million gallon resevoir is approximately
25 percent cheaper per gallon to build than a single one-million
gallon reservoir. This combined reservoir would be at a higher ele-
vation and would require a pressure reducing station at approximately
the 160 foot elevation. A separate reservoir would also require a
pressure reducing station. By combining storage for CMWD and the
City of Carlsbad at one location-it would be easy to provide additional
emergency or fire flow into numerous areas as required. The proposed
CMWD system will be flexible to allow flows from storage to different
pressure zones and areas. Another point of consideration would be
the phasing of needs in the different areas. If the Northeast area
is not developed for a considerable number of years then the City
cannot rely on increased flows into other areas until this system
is constructed. They must also consider the timing of any reservoir
storage to be constructed by CMWD. Whenever additional storage is
necessary by either agency it will be vitally important that each
review their storage needs and thoroughly investigate the joint
project aspect of a storage reservoir. With a joint reservoir it
would also be feasible for the City of Carlsbad to provide service
to portions of Pressure Zone 2 from the joint use reservoir and then
provide flows downstream through pressure reducing stations.
-9-
TABLE I
FIRE FLOW REQUIREMENTS
LAND USE
DWELLING UNITS
PER ACRE
1.
2.
3.
4.
5.
6.
7.
RL - Low Density
RLM - Low Medium Density
RM - Medium Density
RMH - Medium High Density
Commercial - Residential
Shopping Center
Commercial - Industrial
Regional Shopping Center
School s
(0-1.5 )
m ( 0-4 )
( 4-10 )
( 10-20 )
FIRE FLOW
1500 - 1750
1750
2500
3000
3000 - 4000
4000 - 6000
3000
NOTE: Fire Flow Recommendations from City of Carlsbad
Fire Department
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