HomeMy WebLinkAbout04/11/1995, 2-B - WATER RESOURCES AND WATER PROJECTS CURRENTLY UNDER CONSTRUCTION BY VARIOUS WATER USERS OF THE SALINAS VALLEY DBA Lake Nacimiento Resort
1995 k, v
March 16, 1995
}
John Moss
San Luis Obispo City
Utilities Director
9555 Morro Street
San Luis Obispo, California 93401
Dear Mr. Moss:
Enclosed is a complete copy of my Analysis and Opinions regarding
various water issues, to be discussed during the April 11, 1995,
meeting of City Councils.
Please include complete copies, with exhibits, in all of the
meeting packets for the participating parties.
I am planning to discuss the thoughts and comments I have made in
this writing at the April 11, 1995, meeting.
Sincer ,
Dan Heath
Water World Resorts, Inc.
DH:cf
enclosures
Star Route Box 2770, Bradley, CA 93426 805/238-3256
I t
WATER RESOURCES AND WATER' :PROJECTS
CURRENTLY UNDER CONSIDERATION.
BY
VARIOUS WATER USERS OF
THE SALINAS VALLEY
BY DANHEATH
MARCE lb,, 1995.
2-� =2
The current challenges facing all of the Salinas Basin water users
are regional. Involving both the North and South areas of Monterey
County as well as the North and South areas of San Luis Obispo
County. They cannot realistically be solved by individual areas.
They must be planned and carried out collectively with everyone
involved participating in the planning process, the approval
process, the funding and the ultimate benefit of use.
Today we are faced with very important challenges regarding the
following projects.
1. Raising the Salinas Dam for the primary benefit of increased
water supplies to the City of San Luis Obispo.
2. Building a pipeline from Lake Nacimiento to San Luis Obispo
County to supply 17,500 acre feet of water annually.
3. Improving the yields of Lake Nacimiento and Lake San Antonio
by widening their spillways, raising Nacimiento six to ten
feet, and building a pipeline between the two Reservoirs.
4. Seawater Intrusion Projects which include North Monterey
County well fields, pipelines, sewer reclamation projects and
conservation measures.
All of the projects listed above should be completed as soon as
possible in order to meet all of the current, and some of the
future, needs.
The reliability of several of these projects depends on the
completion of others. I will discuss all of these projects
separately. I believe that the three existing reservoirs, Santa
Margarita, Nacimiento and San Antonio have the ability to meet all
of our immediate needs and many of our future needs in the most
cost effective manner.
We should evaluate and implement justified construction projects
aimed at increasing water supplies. We should also modify past
methods of operation, as required, to increase yields and mitigate
detrimental effects to other down stream users.
1. RAISING THE SALINAS DAM
This project is justified and needed. The oak trees that will be
lost can be replanted. The project can be implemented in a fashion
which guarantees that no detrimental effects will result to down
stream users.
1
Z-5 - 3
During very wet years, such as the current one, vast amounts of
water flow over the top of the Salinas Dam. Certain portions of
that water flows over the top of every aquifer in the Salinas
Valley and ends up in the Monterey Bay. It is foolish to let this
water go to waste when it is so desperately needed for "our"
future. (When I speak of "our" it is all inclusive. "Our" as I
use it here is all of us that depend on the Salinas Valley
Watershed. )
The spillway should be raised and an operational plan should be
implemented that only allows storage during very wet years when it
can be determined via stream gauge monitoring that the additional
water being stored behind the dam would not and could not percolate
into the already saturated Salinas River aquifers. This may mean
that the gates cannot be closed 100% as they currently are during
certain times. But the time has come to raise our methodology of
water management to levels more commensurate with today's demands
and current technology.
2. THE NACIMIENTO SAN LUIS OBISPO COUNTY PIPELINE
This is a very important water project for San Luis Obispo County.
It should be constructed as soon as possible. However, prior to
its construction, other projects must be completed. Without the
prior completion of improvements to the Nacimiento and San Antonio
Reservoirs, as well as changes in their operational methods, this
project will not be reliable when it is needed the most.
Furthermore, if constructed prior to other improvements, the San
Luis Obispo Project will cause millions of dollars in damage to the
tourism industry of Northern San Luis Obispo County because the
cumulative effect of withdrawing an additional 16, 000 acre feet
annually, without increasing the yield, will create lower average
lake levels and cause the Lake to reach minimum pool more
frequently.
In 1992, this project was the subject of a reliability evaluation
conducted by Boyle Engineering for San Luis Obispo County. An
evaluation of that report is attached to this paper as Exhibit A.
I believe the Boyle Report lacks proper support for its conclusion
that Nacimiento would be a 100% reliable water source. San Luis
Obispo County should begin participating in the improvement
projects for the Nacimiento and San Antonio Reservoirs currently in
progress by Monterey County in order to increase reliability.
Without the joint participation of both Counties in the planning
and approval process, and the funding and the ultimate use of the
increased water, these projects may never become reality.
2
3. WIDENING THE NACIMIENTO AND SAN ANTONIO SPILLWAYS
RAISING NACIMIENTO AND CONNECTING THE TWO VIA A TUNNEL.
These projects are mandatory and essential to both guarantee the
reliability of the San Luis Obispo pipeline project and the control
of seawater intrusion into the Northern Salinas Valley. These
projects have the potential to increase the yield of the two
Reservoirs by tens of thousands of acre feet. This year, for
instance, over 50, 000 acre feet of water has been dumped into the
Ocean from Nacimiento and that number could reach 100, 000 acre
feet.
All of this water could have been saved, if the spillway at
Nacimiento was raised and widened, and a tunnel between the two
Lakes was constructed. As of this writing, Lake San Antonio is at
50% capacity with an available storage of 165, 000 acre feet of
water.
As currently operated, when extra water is accumulated during wet
years, Monterey County is over drafting both Reservoirs. That is,
they are taking out more water on average than flows in.
Therefore, when an above average year occurs, such as in 1992, the
total excess supply is depleted within two years and both
Reservoirs wind up at minimum pool.
Nacimiento has reached minimum pool seven out of the last ten
years. San Antonio has reached minimum pool five out of the last
ten years and has not risen above 35% capacity since 1989 until
1995 when it reached 50%.
At March 15, 1995, levels, if 1996 is dry., both Nacimiento and San
Antonio would reach minimum pool by October 1996.
If the San Luis Obispo project was in place, and the Seawater
Intrusion Program was implemented, delivery for both projects could
be in jeopardy eighteen months from today, in spite of record
rains.
A joint effort by both Counties should be undertaken to complete
these projects. Without a joint effort, they will bog down in
concerns about Monterey County taking more water, leaving less for
San Luis Obispo, and the negative impacts to fish and wildlife. As
well as the harm to the tourism industry and concern over up to
50,000 oak trees that could be lost along the shoreline.
With a joint effort the money to build the projects will be more
readily available. The increased yields can be shared by both
Counties. Harm to the tourism industry will be mitigated and
environmental concerns can be mitigated rather than litigated.
3
-z - 5 - 5
4. SALINAS VALLEY SEAWATER INTRUSION PROGRAM.
These programs are like all of the above, they are vitally
important and should be implemented as soon as possible. However,
they too are totally dependent on increased supplies of water
without which they will not work. The only way to increase the
supply is to save more of the water now running into the Ocean.
The only place to practically accomplish this is within the
Nacimiento and San Antonio Reservoirs.
In conclusion, both Counties are desperately seeking solutions to
their water needs and problems. If everyone works together
constructively, we can solve "our" water problems and short falls.
If we do not work together, these programs will not go forward.
They will all fail as they are bogged down in litigation,
environmental red tape and fractional feuding amongst the various
groups.
Great examples of this are already present. During the last three
years, Southern Monterey County citizens and Northern Monterey
County citizens have spent nearly $1,000,000 litigating with each
other over water issues. As a result, nothing positive has
happened.
In San Luis Obispo County the City of San Luis Obispo is reported
to have spent nearly $1,000,000 on the Salinas Dam Project. North
County citizens are against it and have threatened legal action.
As a result, the project appears to be on hold.
It is time for everyone to face up to the fact that water resources
must be, and eventually will be, improved. If we do not do it, our
children and their children will have to, at far greater expense.
All of these projects are important. We should stop finding
excuses to stop them and work on solutions which, when shared
proportionally, will benefit all of us.
Attachments include:
A. Analysis of Boyle Report, by Dan Heath
B. Table 1 - Boyle Report
C. Table 2 - Boyle Report
D. 1957-1994 Nacimiento Storage Graphs
E. 1994 Reservoir Release Schedule
F. Joe Madruga's May 8, 1990, memo regarding Water Availability
for the Year.
G. Excerpt from the Monterey County Basin Management Plan,
regarding Spillway Modifications and Increased Yields
4
z- e)- (O
Boyle Engineering Report
November 7, 1992
Reliability Evaluation
Nacimiento Water Supply Project
This Report concludes that "The Reservoir operations simulated by
a computer model indicate that Nacimiento Reservoir could have
supplied 100% of the San Luis Obispo District's entitlement from
October 1950 through November 1990. " This conclusion is based
entirely on hypothetically developed quantities. Those
hypothetical quantities are not supported by historical data and
lack the proper support to qualify as reliable.
In reaching their conclusion, which had to be positive if they were
to proceed with Phase II and III, etc. , Boyle relied solely on
their simulated computer analysis.
This analysis has, or is, of little value from a practical
standpoint. It uses hypothetical storage amounts and hypothetical
release quantities, neither of which come close to reflecting what
has historically taken place.
As illustrated below in two examples of time frames, there are
large variations between the actual historical reservoir levels and
releases, versus the simulated quantities Boyle relied on to reach
their conclusion.
Comparison Between Actual Historical Data
and Simulated Data.
Beginning Years Storage Annual Releases
in 1,000 ac/ft in 1,000 ac/ft
Year Actual Simulated Actual Simulated
1968 200 242 189 164
1969 36 85 619 434
1970 26 242 134 212
1971 54 158 150 376
1972 36 109 83 122
1973 14 22 168 162
1986 34 40 156 127
1987 226 226 164 151
1988 132 120 183 150
1989 25 22 70 27
1990 11 22 8 12
In order to reach valid conclusions regarding the historical
reliability of Nacimiento as a water supply, historical data must
be given priority over computer model simulations. A good example
1
EXHIBIT A
Z-4 -1
of why the simulation is not reliable is available in the data
relating to water years 1969 through 1978.
The historical data reflects the draining of Nacimiento after the
Floods of 1969. This draining was necessary to repair flood damage
to the dam outlet works. As a result of this draining and the
following dry winters of 1970 through 1972, Nacimiento remained at
an average beginning capacity of 39,000 acre feet.
The Model simulation provides an average beginning capacity of
162, 000 acre feet, 123,000 acre feet over and above the actual
level.
To actually evaluate what would have taken place during the years
1969-1973, the assumption must be made that all releases made by
Monterey County would have been made as they were, regardless of
the fact that San Luis Obispo County had a pipeline installed.
This would have resulted in the following beginning year reservoir
levels.
Year With SLO Pipe Actual Simulated
(In 1,OOOs acre feet)
1969 22 36 85
1970 22 26 242
1971 35 54 158
1972 10 36 109
1973 10 14 22
In addition to the problems with reliability as demonstrated above,
there appears to be problems with certain data collection by
Monterey County which is more than sufficient to cast further doubt
on the reliability of Boyle's conclusions.
For example: The year October 1971 through September 1972, yielded
6.52" of rain. According to Monterey County's Nacimiento Dam
Operations Summary, this rain occurred during one primary storm in
December 1971, which produced a yield of 31,000 acre feet.
Monterey's summary indicates a total inflow to the Reservoir of
61,552 acre feet for the year, of which 12, 123 acre feet supposedly
flowed in between March and September when a total of .39" of rain
fell.
According to Lake capacity graphs compiled by Monterey County,
Nacimiento began at a capacity of 36,000 acre feet and reached its
peak March 1st at a level of 78,000 acre feet, an increase of
42,000 acre feet. Total discharges between December and March 1st,
equaled 1,519 acre feet.
This discrepancy of 20,000 acre feet casts further doubt on both
the reliability of the Reservoir and the reliability of the data
used to determine the reliability.
2
It is also interesting to note that according to Monterey County
the 1971-72 rainfall year was the driest on record between 1951 and
1991. Yet, Monterey County reported that 61,552 acre feet of water
flowed into the Reservoir, although their graphs indicated it was
42,000 acre feet. The two years prior to 1971-72, were also dry
years with an average rain fall of 10.08" . In 1977, when 7.26" of
rain fell, only 13,548 acre feet of water was recorded by Monterey
County as inflow into the Reservoir. The average rainfall for the
two years prior to 1977 was 10.94".
In reviewing the Boyle Report, it is apparent that there are
potential problems with the reliability of base data provided by
Monterey County. There is a long history of dam keepers
accumulating data on the back of envelopes laying in their pick-up
trucks, which sometimes have and sometimes have not been
transcribed into formal data records. As reported by Boyle,
Monterey County was unable to provide anything other than hand
written records for the period of 1986 through 1991.
Further doubt is cast on Boyle's conclusions when you consider that
it is based entirely on a computer model which, in some cases,
predicts beginning reservoir capacities at levels equal to 900% of
actual, such as in 1970, when the actual beginning level was 26,350
acre feet and the model started with 242,853 acre feet.
Perhaps the best example of the erroneous conclusions based on the
simulated model, are demonstrated by reviewing the bottom lines on
Table 1, which is actual historical data, and Table 2, the
simulated data used by Boyle in their report.
Nacimiento Historical Averages Simulated Difference
Beginning Capacity - Acre Feet
116,881 165,305 <48,424>
Average Inflows
202,282 202,682 -0-
Average Releases
195,617 174,969 <20,648>
The average inflow was 202,282 acre feet
The average outflow with
no releases to SLO County 195,617 acre feet
Average Net Available 6,665 acre feet
above what Monterey County
Historically used and released.
3
Z_6
To accurately evaluate the reliability of Nacimiento the following
parameters should be followed:
1. Verify the accuracy of all base data.
2. Use historical data including those years when the Reservoir
was drained for repairs. Issues of dam safety and reservoir
draining cannot be ignored.
3. Begin all years with reservoir levels which reflect the past
years historical beginning point, the historical releases and
the cumulative effect of the additional use by San Luis Obispo
or 17,500 acre feet compounded annually where appropriate.
4. Reevaluate the years 1985 through 1995. During this period,
demand for water had greatly increased in Monterey County and
therefore, when the water was available, more was released
than had been historically prior to 1985. This resulted in
Nacimiento's draining to minimum pool in 7 out of 10 years.
With the San Luis Obispo pipeline in place, the Reservoir will
reach minimum pool more often that it has historically. Whenever
this occurs, San Luis Obispo will be in danger of water
availability short falls, . Although, 12,000 acre feet is available
at the beginning of the year, this assumption is based on the fact
that San Luis Obispo doesn't use it as it will undoubtedly have to
in dry years.
Boyle projects average evaporation rates of 10,448 acre feet with
a minimum average of 4,000 acre feet. These statistics when
combined with recorded historical inflows as low as 13,500 acre
feet, verify that during future droughts which take place over
periods of two to four years, Nacimiento, as currently operated,
would not be reliable. Due to increased demand for water by
Monterey County, Nacimiento is far more likely to be at, or near,
minimum pool at the beginning of future droughts rather than at
higher levels as in the past. When this occurs, only small
portions, if any, of San Luis Obispo's allotment, will be
available.
With all of the above in mind, a new reliability elevation should
be undertaken prior to proceeding with further project planning.
DH:cf
4
2-6-10
TABLE 1
HISTORIC ANNUAL NACIMIENTO RESERVOIR OPERATION SUMMARY
BEGIN OF AVERAGE TOTAL TOTAL TOTAL AVERAGE ELEVATION
YR STORAGE INFLOW PRECIP LAKE EVAP NET EVAP RELEASES
YEAR (ACRE-FT) (ACRE-FT) (INCHES) (INCHES) (INCHES) (ACRE-FT) MIN MAX
1951 N/A 115,625 8.88 49.89 41.01 115,625 N/A N/A
1952 N/A 401,192 16.89 49.89 33.00 401,192 N/A N/A
1953 N/A 151,094 9.61 49.89 40.28 151,094 N/A N/A
1954 N/A 103,712 12.39 49.89 37.50 103,712 N/A N/A
1955 N/A 73,232 12.46 49.89 37.43 73,232 N/A N/A
1956 N/A 321,547 16.39 49.89 33.50 321,547 N/A N/A
1957 N/A 61,916 11.13 49.89 38.76 74,536 N/A N/A
1958 N/A 457,578 29.24 49.89 20.65 234,753 N/A N/A
1959 N/A 96,232 8.10 53.11 45.01 231,518 N/A N/A
1960 N/A 89,180 9.20 51.71 42.51 154,542 N/A N/A
1961 N/A 44,133 9.93 54.48 44.55 35,705 N/A N/A
1962 N/A 255,713 16.30 48.78 32.48 159,702 N/A N/A
1963 N/A 253,627 18.78 42.57 23.79 135,537 N/A N/A
1964 N/A 72,911 9.09 47.64 38.55 214,460 N/A N/A
1965 N/A 194,610 12.62 47.20 34.58 143,974 N/A N/A
1966 185,200 155,123 13.53 51.33 37.80 171,276 725 769
1967 52,600 432,414 26.15 64.74 38.59 280,784 715 799
1968 200,000 38,124 8.00 51.03 43.03 189,310 714 767
1969 36,300 619,208 31.84 46.32 14.48 619,367 704 802
1970 26,350 160,720 9.49 50.40 40.91 133,984 672 750
1971 54,400 143,390 10.67 49.64 38.97 149,552 715 760
1972 36,300 61,552 6.52 55.54 49.02 83,062 691 725
1973 14,050 372,626 24.27 45.59 21.32 168,616 677 792
1974 200,000 278,434 18.44 47.16 28.72 255,001 767 796
1975 200,000 245,884 13.10 48.32 35.22 237,728 760 793
1976 211,200 25,608 8.78 53.82 45.04 178,760 717 768
1977 50,900 13,548 7.26 51.10 43.84 43,968 702 714
1978 11,500 525,231 29.22 48.29 19.07 306,262 672 800
1979 218,800 163,412 16.36 51.73 35.37 183,698 766 790
1980 185,200 395,618 20.93 44.96 24.03 360,036 760 789
1981 215,000 97,831 11.32 52.79 41.47 167,368 750 783
1982 123,450 279,087 15.43 43.39 27.96 139,759 745 799
1983 238,900 674,770 28.04 41.92 13.88 726,011 772 800
1984 218,800 136,449 7.96 52.07 44.11 215,810 744 781
1985 106,300 112,775 9.04 51.37 42.33 179,978 709 759
1986 34,050 345,409 18.68 49.89 31.21 156,229 693 796
1987 226,600 75,691 9.55 49.89 40.34 164,956 751 776
1988 132,800 76,919 13.12 49.89 36.77 183,597 702 752
1989 25,450 47,908 17.95 49.89 31.94 69,789 672 714
1990 10,950 21,628 8.61 49.89 41.28 8,498 672 695
1991 23,800 118,294 14.50 49.89 35.39 95,771 689 746
AVERAGE 116,881 202,682 14.63 49.89 35.26 195,617 718 770
1951-1991
i.
s.
f
11-2-92 12
EXHIBIT B
�,g- 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
O P uAt 0 0 0 n 0 0 0 0 0•O O O O O O O O O O O O O O O O n 0 0 0 0 0 0 0 0 0 Of.CT O M
o n
. .nv m v V M'pa
• N . ^P ' mY � VN1
N A Y
• 25 H . 0 0 0 0 0 0 0 0 m 0 0 0 0 0 0 0 0 0 0^O O O m Y 0 0 0 P^O N.O Y O N 0 0 0 0 0 . V
• O< . V ^A O H M O O^v^N � . n
• J W . ^ M V^ Y N m..1 A Y O Y . e
• WJ . NAPaOO A
CO
• W � ^N^ H O 1!1.O •O
• � • N
o o O O O o o o o Q Q O Q o o Q O Q o o o o O o C;a;C;a;o C;a;Q O Q O Q O Q o o Q
• �a W .
O J
OC W
S NW . Om^�ONV Y.AHNN^.�pNNO.Oq�OP^O nP1�MmmPQO NO P�N.pO tl�q� � �
� 2J . .n^NPAAPNmuYmNNYAJP•O.O mm^YIv
OW . M ^N^^utn MVt^ ^NNNMNMNANNNYm ^NM n1ANNnNNu1 N . v
W< . HVOA.T.pN py V1M^P•OMOMNY.ONNOmOAMY^hA.Om^NN^mmy���11•vpr�
_ Z? . NPNN�{^N ./'1.p QaAtppANYPNMCEOONPNNOYIN mNOnn�N.M�ppNA.O�1D•00• � N
• W YP^�OOPOOVPIV O.OPNONN�PAY—O--- On O-Nm-VHLl1N ANM
Z F
O_ LO
• . AHOPOVA..ppmA-•pNNPMNNANNA•O.00PAmAV1 m.nPMn AOO^nO^
• J • MP•00.ON^q.p V1H^M.T•O.O'•OP O1!•M MN.O.ONVVIMAA M.O V�MAN.OPM . p
F"' _ P�Mm�N^.p.00 O.O M•O pH.VNNmM PA.ON m7?OAM .AY�}{pV 0•--.pONYY^ . V
Q c^^ • . MNHN^NNOMNVAP�vNnr•M NMmmmANaN V1AM P•-•�OmO�THMN . Q
C • • ^ ^ N ^ N ^ N H K N^M^^ n . A
cc
W • �ppaOp ^ ^ .
cc
O • C O.O.OOv�m�Pv�P.OA�AYnMmOM.VrPd��Nv�O1�m�YNOOt^tpp��OttP�A qOq . y�
• O . OPV1O V1NOOm10AMV^� OPm^v1.OPAA A.n O.OVAAONv1.pA OvtP m . yt
O W : N N^--- ----- ----------- ..
—^----NN^NNNN ......
NN^•O^^ . m
• ^
M Q
Lu U) J • O . N 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.O.O.O ry
J W w • _ •o m a
P N
CO CL � • N N ^^ ^aP M
O p nM
Z O!2.K y�1OOOOOyOy1 OOOOOOOyyO1 yyO1 y1OA1 yyO�1OyyO11 yOy�1y{O.'1 O{(11 yOy1O (O1(11O Oy1O1'1OOOyyO11OOyOy11OOOM N
W m • JOJ AI�AAAAAAA�AAA�AAI�AI�AI�I�I�AI�AAAAI�A�tif�AAf�AAAvt A
O <�c -----------------------------------------
N
Q : N N ONMOOOOV.000OOOOONOOMHONtnAO0MmnO 1A VOPOOOOO . N
U< • ^
Z •O m •O .- H.-o ^O vt A.p N •O n A •00
'••� �� ; �� ut m an� nna vtrvn AVq11n � �
w
Q Q : . NV M PNmm ^PN v.OM H1 ; v
N N Yt^
Cl) r.W . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . .
o000000000000000000000000000Qooe000000000 o
Z —J W
Q D = O J
CC W
OU SN . . . . . ...1�NMP^PVA . . . . . ..ONm .. . . . ..--mN^V.O.OPA . .. . . . Y
LL S NW . pYp..m•0��0}}^O1�V-OP^YNN.-^SOA PfT•OHNOYmV�^�d{�V.+YjONAYAV�ON • y�
OW . PHA.p1f1MN�m.00NOPNYNY^^HNP1i1O^NA1/1P Auto Y1N^ -O.O N.O . Vt
• UL[ • p^�-�- ^.-^��M�nM�^��^�����pp�...�p��N��.^t�aA��M���N^m . •N--
• • •P VtN u1 V1 M1nAnO.ONMvO^AOmNryPNNVt rv.O Vt��PP�
co O~ONQ coN P . V
• ' MnmYMmOVf O1l1O C 0 P0- NO^NCO^NJNVPVO'^•O^PM^�OMNV1 . O
• • ./1NYNNA.pmNOMMA^OMYYmOON.OY mm^Nm^AOPy1.-.1 . . . . . . N
• •� `0^OANN_Pyy11N►^A.p ol MVtOOV1Nv.O1DOAVAV•OPP.ON
• = • ^^'-•n��11 �1�•GP YIAMNYu1NmPOm—mmV1 Y1 M 1/1M VIAPY.ON Y1N.pA^m �
• OV1O 1�N.p Vt PmYvt V1APNMH^ OYtOAAVN^N1pPPAAM^VAAYN.-
• ^V^� M v NN ^^V O�-^ MNN Nr'M N•O^^M ^ . N
W . . . . . . • . . . • • . . . . • • . • . • . • . . . . . . . . • • • . . . . • • . .
• < . OOen.OpOOHOPPP0V1VONyAO1APNNVO^VH^OANNAAOVAmNOOvt . O
-----------------------------
• O • HNOONNYNYYV1NPAn.O/I�mYYtON O/�1N V1N n�H.O�mOVNNNN^ . .gyp
C . ^NHV N.pAmPO^NHVvt..ppAmPO^N YVt OAmQO^NMV N.OAmP pO p^ ^
w P P P P P P P P P P P P P P P P P P P P P P P P P P P P a P P P P P P P P P P P P >
r
f
1
6
11-2-92 16
EXHIBIT C Z-g-12
m
M
0 0
O � OD N
II II �
tB
3T
UJ Q Lo � � rn
rn P-
rn � T
M
W
I.M.L CO 13 0 r II II _ 0) LLI
Q
o }
� -LL (�n
4-Jw
�►- W
® O H
0
00 Q
00) 0 c
N CC)
rn CC)
Z Q II II c
m
LU -oo o co
— a
w
v 2 CL C m
0
U
QLO
Z CL
CO
LO LOo LO o Lo
d' C'0 co N N T T
(spuesnogl)
133J-31JO`d Ni 3E)VHO1S d31VM
Z.
EXHIBIT D
RESERVO' -TORAGE IN AC—FT X 1000
J J N L4 CA
O cn O O Ln O Ln O D
II1'^1'I1_ O O O O O O
1 L
__ ll
O
Zt4:�
V!
D
Z
O
^� O
Y.
-� II tz
_.
r n
V r
rn r
z
�. Ti
.V
m
ry
.Y W C/)
O rTl
O_
.6.
.V
AI
.M
I
.C. -
�tl
RESERVO STORAGE IN AC—FT X 1000
N N (A W
p O Cn O cn 0 V
n O O O O 0 O
Kf
rq
Ln rrl
Z
Z
•
•
I
r
- z
� � n
.a
r
� z
� 0
co Cf)
o fTl
Z7
2_g� ►S
RESERVO STORAGE IN AC—FT X 1000
W W
p NO O U10 Ln O U1
n O O O O O O
Z
U)
D
D
. C7
I � -
r
� z
ao I Cf)
p m
LM
al
Z-61 (0
ON THE FOLLOWING PAGE
IS A 1994 RELEASE SCHEDULE
FOR NACIMIENTO AND SAN ANTONIO.
THE TOTAL PLANNED RELEASE WAS
229,010 ACRE FEET,
100% OF WHAT WAS AVAILABLE.
IN PAST YEARS,
SUCH AS 1985, COMBINED
CONSERVATION RELEASES
TOTALED 175,000 ACRE FEET.
Z-6-1-1
EXHIBIT E
Jt1L-21-1594 15:21 FROM EF RESOURCES RGEhICY TO 16052386222 F.01
To; DA,N �kEkn-t .
1p gym: BOE I"�AORu�-a
5Lk8T'% L-p,TE5T Rev sxs€ SCAEDuLE
7-21-94
MONTEREY COUNTY WATER RESOURCES AGENCY
RESERVOIR RELEASE SCHEDULE FOR 1994
DAY AVE NAC SA NAC NAC SA SA
FLOW PLO FLO STORAG ELEV. STORAG ELEV.
(CFS) (CFS) (CFS) (AC-FT) (FT) (AC-FT) (FT)
Apr. 26 1 129,500 747.0 144,000 734.6
19 7 12
June 1 36 128,996 746.8 143,136 734.3
932 427 505
July 4 69 100,814 736.8 109,806 722.4
600 280 320
July 20 85. 91,854 733.1 99,566 718.2
700 425 275
Aug. 1 97 81,654 728.8 92,966 715.3
710 420 290.
Aug. 15 111 69,594 723.6 84,846 711.6
700 415 285 7/76
Sept. 5 132 52,464 714,9 72,876 705.3 - '7D6 7
490 210 280
Nov. 15 203 22.644 689.5 33,116 677.0
225 15 210
Dec. 8 226 21,954 688.6 23,456 666.4
20 12 8
Dec. 31 249 . 21,402 687.9 23,088 665.9
SUBTOTALS: 108,0 J 8 120,912
TOTAL RELEASES: 229:010
MEMORANDUIR FLOOD CONTROL AND N :R CONSERVATION DISTRICT
COUNTY OF MONTEREY
TO: SV Water Advisory Commission DATE: 5-8-90
FROM: Joe Madrugat/1
SUBJECT: Release Schedule from Nacimiento and San Antonio Dams
With the drought situation as critical as it is, we are
concerned with our obligations regarding the release of water from
Nacimiento Dam this year. The District staff wishes to present the
situation to the Commission and asks for your comments and approval
of a recommended release schedule.
As you are aware, in normal years we release as much water
(230,000
m the two dams as we can percolate into the Salinas River
nnel without wasting water to the ocean. This year we have no
er to release from San Antonio Dam. The lake will be some five
t below minimum pool by the end of summer due to evaporation and
inimum required fish release. Lake Nacimiento will have
roximately 3,000 acre-feet available to release. This means the
inas Valley will be limited to about 2x of average water
colation releases this year, or about 3,000 acre-feet out of
,000 acre-feet. In such a dry year as this, we could percolate
acre-feet if we had it.
PROPOSED RELEASE SCHEDULE: Hold the water in Lake Nacimiento
until mid-August, then release at maximum outflow, which is about '
400 cfs. We only have enough water to release for about four days.
We then will reduce the outflow to 10 cfs, which is the minimum
release required by our agreement with Fish & Game.
This release schedule would provide enough water for the flow
in the Salinas River to reach somewhere between King City and
Soledad. The low level outlet works of Nacimiento Dam is not able
to provide a flow higher than 400 cfa at this lake elevation.
Additional releases from San Antonio Dam would be needed for the
Salinas River to reach beyond Soledad.
Our Agreement with San Luis Obispo County requires that we
keep a storage of 22,000 acre-feet in Lake Nacimiento on September
30th. This has been confirmed with County Counsel.
Options to the proposed release schedule include:
--releasing at a slower rate to provide more recharge to the.
upper Salinas Valley, . which has a shallower aquifer and will likely
be impacted more adversely by the drought;
--not releasing at all (other than. the required fish flow of
10 cfs) to keep Nacimiento 3 to 4 feet higher in order to provide
maximum recreation benefits at the lake;
--releasing at a different time than mid-August to either
slightly reduce evaporation losses (earlier releases) or ensure
that we meet our obligation to San Luis Obispo (later release) .
The recommendation of the Water Advisory Commission will be
given to the Board of Supervisors when staff requests the Board's
approval of a release schedule.
EXHIBIT F
a .
Monterey County Water Resources Agency BMP
•
1 1 1
('f M���1J.Ci.•T 4 k I
y ��r�"C Y NYi
r
h+_
d'y�S
G w
� JJ��YYRR y�y11
' L 2GJ
6,M
wl
R� la
fL_1>' YIL y L.
Fes # �♦ ♦+
C-„z-
h r
Fl,
/p
r �
NI 1p
L �
Monterey County Water Resources Agency BMP EIR
Raise and Widen Nacimiento Spillway: The following components will be treated at a
program-level in this EIR; when project-level details are developed,they will be further evaluated
in a subsequent project-level EIR.
Raising: The raising of Nacimiento Dam spillway could provide a potential 19,500 acre-
feet (AF) of additional water for downstream uses (water yield). This component would involve
raising the spillway by approximately 6.5 feet above the existing crest, thereby increasing storage
capacity by 34,000 AF. Nacimiento was originally built with a gross storage capacity of
350,000 AF. This modification would result in an increase in the existing maximum area of
inundation.
Widening: A new flood rule curve at Nacimiento Reservoir required by the Federal Energy
Regulatory Commission (FERC) and the State Division of Safety of Dams (DSOD) reduces the
water conservation yield of the reservoir compared to previous operation. Widening the spillway
so that it could pass a Probable Maximum Flood would remove the mandatory restrictions of the
existing rule curve. If the MCWRA returned to an operation that is similar to what was used in
the past, there would be an increase in the water yield of the reservoir. Also, the existing
110,0000 AF of flood storage could be reduced, decreasing flood protection to downstream
property adjacent to the Salinas River, but increasing the water yield of Nacimiento Dam. If the
flood pool were greatly decreased, the increase in average annual water yield could be
approximately 30,000 to 40,000 AF.
Widen San Antonio Spillway: This component will be treated at a program-level in this EIR;
when project-level details are developed, they will be further evaluated in a subsequent project-
level EIR.
A new flood rule curve at San Antonio Reservoir required by DSOD reduces the water
conservation yield of the reservoir compared to previous operation. Widening the spillway so
that it could pass a Probable Maximum Flood would remove the mandatory restrictions of the
existing rule curve. If the MCWRA returned to an operation that is similar to what was used in
the past, there would be an increase in the water yield of the reservoir. Also,the existing
90,000 AF of flood storage could be reduced, decreasing flood protection to downstream property
adjacent to the Salinas River,but.increasing the water yield of San Antonio Dam. If the flood
pool were greatly decreased, the increase in average annual water yield could be approximately
2,000 to 5,000 AF,
Water Conservation: In addition to the existing conservation programs in the Salinas River
Basin, the BMP will address the development and implementation of agricultural upper pumping
limits and a drought contingency plan. The upper pumping limits would be developed to target
"inefficient water users"by establishing water efficiency goals,consistent with a previous
MCWRA ordinance, and the drought contingency plan would be developed to address the
management of the Salinas Valley's surface and groundwater resources in the driest of years. The
actual implementation of these measures could vary by farm and by hydrologic subarea; the EIR
2. Pb- 21
N.2s076.03.030 (revised) Attachment 3-page 5 November 29, 1994
Fp
hMo.. .:y County Water Resources Agency BMP EL
ill address the range of possible responses and the possible associated environmental effects.
This component will be addressed at a project-level in the BMP EIR- No additional
environmental documentation will be prepared.
Salinas River Well System,Recharge Activities and Pipeline/Distribution System: These
three components represent a capital project and will be addressed at a project-level in the BMP
EIR. The well system, recharge activities and distribution systems would be developed together
as an integrated project. The actual locations of each of the components is still in development
and will be determined in part through the EIR process.
Salinas River Well System: As currently proposed, an average of approximately 50,000 AF of
water per year would be withdrawn from either proposed new wells or Ranney Collectors (or a
combination of both), dispersed along the Salinas River between Greenfield and the Chualar
Bridge. Wells and/or Ranney Collectors along the Salinas River would benefit from releases
from the Nacimiento and San Antonio Reservoirs as well as from natural flood waters of both the
Salinas and Arroyo Seco Rivers. To the extent possible, wells would be located at least 1,000 feet
apart, at least 1,000 feet from the banks of the Salinas River and at least 1,000 feet from an
existing well. It is anticipated that a minimum of 36 and a maximum of 78 wells would be
utilized. This component will be addressed at a project-level in the BMP EIR. No additional
environmental documentation will be prepared.
Recharge Activities: Artificial recharge activities under consideration in the BMP include
percolation ponds near the Salinas River, and percolation ponds and/or injection wells at the
groundwater depression cone area located east of the City of Salinas (or in other areas).
Percolation ponds near the Salinas River are expected to require approximately 600 acres of land.
This would be accomplished by creating up to 50 ponds in the area between Soledad and Chualar,
east of the Salinas River. The recharge ponds would be a approximately 12-acres each. Water
for recharge would be drawn from the Salinas River by the use of Ranney collectors and/or wells.
Up to six Ranney collectors could be developed and most diversions would occur between
December and March. Eastside recharge would probably occur through injection. Water could
be diverted from the Salinas River through wells and Ranney collectors,treated, and injected in
the Eastside or other areas. The locations for injection have not yet been determined. This
component will be addressed at a project-level in the BMP EIR. No additional environmental
documentation will be prepared.
PipelinelDelivery System: Pipeline systems could be developed to convey water from the Ranney
collectors to the recharge areas,from the well system to the service area,and from Ranney
collectors near Spreckles for direct diversion to the Castroville Seawater Intrusion Project(CSIP)
area. If Ranney collectors are used for recharge in the area of the Salinas River Well System,
pipelines would be developed from the Ranney collectors to the recharge areas.
Delivery of water from the proposed Salinas River Well System to the proposed service area
would require another pipeline/delivery system. The potential service areas for existing pumpage
replacement with BMP water have been defined as the agricultural area between Castroville and
N:2s076.03:030 (revised) Attachment 3-page 6 November 29,1994
2 — g' Z2