HomeMy WebLinkAbout1994-09-27; Municipal Water District; 255; San Diego County Water Authority Presentation.
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9127194 San Diego County Water Authority DEPT. HD.
MTG. Presentation on Emergency Storage CITY ATTY ii&
DEPT. CMWD CITY MGR. %&
RECOMMENDED ACTION:
No action is required. This is an informational item only.
ITEM EXPLANATION:
The San Diego County Water Authority is proceeding with its study of alternative sites
as part of the Emergency Storage Project. The purpose of the Emergency Storage
Project is to provide sufficient emergency water storage capacity to the region so that if
there is an interruption in the county’s imported water supply, there will be another
source of water during that time.
The Water Authority is scheduling presentations to update various Boards and City
Councils in order to keep them informed of this issue and provide a forum for questions
and input. The Water Authority has made two prior presentations to Carlsbad’s Board
. g about the Emergency Water Storage Project.
-d u
FISCAL IMPACT:
There is no fiscal impact.
I Emergency
Water Storage I
for San Diego
County
l Ninety percent of San Diego County’s water is imported
from hundreds of miles away?
l A major earthquake could knock our imported water
supply out of service for up to six months?
l Our supply also is threatened by environmental laws
that may restrict water availability and by severe,
prolonged droughts?
l Local reservoirs can’t provide enough water to meet our
needs during such emergencies?
l The emergency water storage shortfall will continue to
grow unless we act now?
Moosa Can
r
on
(68,000 acre- eet) +
reoperated Lake Hodges
(22,100 acre-feet)
l 34O-foot dam and new reservoir in
Moosa Canyon, located in Valley
Center.
. 84-inch pipeline and pump station to
deliver water from reservoir to existing
Authority pipelines.
l &-inch pipeline and pump station
connecting Lake Hodges to existing
Authority pipelines.
l Water would be delivered to most of
county by gravity; two new pump sta-
tions would be needed to pump water
north of Moosa.
l Various private citizens own portions of
Moosa Canyon. The City of San Diego
owns Lake Hodges.
l Advantages: some potential to construct
project in phases to reduce rate
impacts; potential cost benefit of joint
use of Hodges with several member
agencies; storage located at two sites;
reliable and efficient because of eleva-
tion, ability to deliver water by gravity
and minimal pumping.
Olivenhain
Water Storage Project
(18,000 acre-feet ),
reoperated Lake Hodges
(20,000 acre-feet)
and expanded
San Vicente Reservoir
(52,100 acre-feet)
l X20-foot dam and new reservoir at
Olivenhain project site southwest of
Escondido.
l 48-inch pipeline and pump station to
connect Olivenhain project and Lake
Hodges so they can operate as one.
l 60-inch pipeline and pump station to
deliver water from Olivenhain project
to existing Authority pipelines.
l 234-foot San Vicente dam would be
raised 54 feet.
l 72-inch pipeline and pump station to
deliver water from San Vicente to
existing Authority pipelines.
l In general, water would be delivered to
northern areas from Olivenhain/
Hodges (using new pump stations) and
to the south from San Vicente.
. Olivenhain Municipal Water District
owns Olivenhain project site. City of
San Diego owns Lake Hodges and
San Vicente.
l Advantages: greatest potential to
construct project in phases to offset rate
impacts; potential cost benefit of joint
use of facilities with several member
agencies; minimal residential displace-
ment; few environmental impacts;
storage located at two sites; potential
for hydroelectric power development.
Expanded
San Vicente Reservoir
(90,100 acre-feet)
l 2344oot San Vicente dam would be
raised 83 feet.
l M-inch pipeline and pump station to
deliver water from reservoir to existing
Authority pipelines.
l Two more new pump stations would be
needed to move water north in the
aqueduct.
l City of San Diego owns San Vicente.
l Advantages: cost benefit of potential
joint use of facility with City of San
Diego; minimal community impacts; no
residential displacement; few environ-
mental impacts; low overall cost;
moderate potential to construct project
in phases to offset rate impacts.
Expanded
(68,000 acre-feet)
and reoperated
Sari Vicente Reservoir
(22,100 acre-feet)
l 234-foot San Vicente dam would be
raised 65 feet.
l 96-inch pipeline and pump station to
deliver water from reservoir to existing
Authority pipelines.
l Two more new pump stations would
be needed to move water north in the
aqueduct.
l Some existing usable storage capacity in
San Vicente would be redesignated as
emergency storage.
l City of San Diego owns San Vicente.
l Advantages: similar to San Vicente Stand
Alone “A” alternative; additional bene-
fits include somewhat reduced environ-
mental impacts due to lower dam height.
Emer
P
ency Storage
A ternatives
90,lOOAF
R ealizing San Diego County faces
an emergency water storage shortfall,
the Authority established the Emer-
gency Water Storage Project (ESP)
in 1990. From the beginning, the
ESP has had no preferred alternative;
every option has received equal
consideration.
Project staff initially reviewed 57
sites where water could be stored,
either above or below ground, for
emergency use. Criteria such as loca-
tion, elevation and volume and envi-
ronmental, operational and financial
yardsticks were used to narrow the
number of potential sites.
At this point, the Authority decid-
ed to combine the storage sites in
various combinations of storage and
delivery options that would meet the
county’s needs in a cost-effective,
environmentally sensitive fashion.
Some 32 of these systems were
reviewed using more detailed biologi-
cal, archaeological, land use, social,
engineering and economic analyses.
ESP staff used a two-step process
employing a computer-based deci-
sion analysis model to screen and
rank these alternatives. The top 13
systems resulting from this process
were announced in October 1993
and then subjected to further review.
In April 1994, Authority staff
unveiled a list of four systems for a
final, rigorous environmental review.
When combined with existing reser-
voir capacity, each of the systems will
meet the county’s projected emer-
gency storage needs through 2030.
The Authority is presently pre-
paring the required federal environ-
mental impact statement (EIS) and
state environmental impact report
(EIR). The draft EIR/EIS should be
available for public review and com-
ment in late 1994. Public meetings
and workshops will be scheduled
and well publicized.
After the public comment period
concludes, the final EIR/EIS
will be completed and
released before the Auth-
ority’s board of directors
decides which alternative
will be chosen. The Authoriiy
then will seek the governmen-
tal permits required to build
the pro@. (See back page
for timeline.)
SAN ANDREAS
SAN JACINTO
E veryone in San Diego County
would be affected if the facilities car-
rying our imported water were sev-
ered by an earthquake or other dis-
aster. The Authority’s Emergency
Water Storage Project aims to correct
this situation by increasing the
amount of water available within the
county for emergencies.
Construction of additional emer-
gency water storage capacity is nec-
essary because the county’s existing
reservoir system is inadequate. Our
last major reservoir was constructed
in 1953, when the county’s popula-
tion was about one-quarter of what
it is today.
Since almost all of the local
reservoirs were built in the early
20th century, most are not connected
to the imported water pipelines. This
makes it difficult to deliver water
around the county as may prove nec-
essary during an emergency. (None
of the reservoirs are owned or oper-
ated by the Authority.)
Most of the capacity in major
local reservoirs is designated for day-
to-day use and existing emergency
storage, while some is reserved for
flood control. This leaves little room
for additional emergency storage
capacity.
After accounting for mandatory
water rationing that would occur in
an emergency, the Authority calcu-
lates the county is approximately
40,000 acre-feet short today of the
emergency water storage capacity it
would need during a six-month
interruption of the imported water
supply.
The San Diego County
Water Authority is acting
to ensure that we have
enough water to survive
a lengthy interruption
of our imported water
supply without lasting
economic and environ-
mental damage?
l - Final Decision and EIR/EIS Certification
Public participation is an inte-
gral component of the Emergency
Water Storage Project (ESP). The
Authority is actively seeking public
participation in the project well
beyond legal requirements.
The ESP public outreach pro-
gram includes presentations to com-
munity groups, government officials
and media concerning the project.
ESP representatives conducted
approximately 100 briefings in 1993.
The Authority’s outreach pro-
gram is a two-way street. Not only
do Authority representatives inform
people about the storage project;
county residents also let the
Authority know their feelings about
the emergency storage issue.
The public outreach effort led to
the establishment of a V-member
citizen committee representing local
environmental, business, recreation-
al and other interests, including resi-
dents living near the sites where a
reservoir may be built. Committee
members helped the Authority to
establish standards used in the
screening and ranking of 13 emer-
gency storage alternatives.
The Authority has hosted sever-
al community open house meetings
and workshops. In addition, the
project publishes an informational
newsletter that is sent to everyone
on the ESP mailing list.
6 San Diego county w&u mttmify
To request a speaker, get on the project mailing list or get more information,
please call the Emergency Water Storage Project hotline - (619) 457-0993.
C$ Prlnmd 0” mcychd paper
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