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~ .. II .......... I ~ ~ (~ .~ ~ ~ ~ ~ ~ ( ':' \: 2. I. . Hydrographs \'\ " "', (' Skagit River Gage at Concrete Ii 9v 24 Feet or 40 Feet or 30 Feet or 40,000 C.F.S. 147,000 C.F.S. 75,000 C.F.S. ,

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SLIDE 1
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SLIDE 2

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. Hydrographs

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45

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25 ~ 20 25

Skagit River Gage at Concrete

Ii

24 Feet or 40 Feet or 30 Feet or 40,000 C.F.S. 147,000 C.F.S. 75,000 C.F.S.

25 December

26 December

26 December
  • ..........
~ .,...- ... ,., ...... ,.,...

150,000 ,

......
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130,000 i i '

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  • 110,000 I
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90 000 t

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70,000'

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u:: DISCHARGE E

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STAGI! HYpROG~APH

50,000 1

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HYDRO GRAPH I I

26

27

28

25 26 27

28 December December
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SLIDE 3 : c'·

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slide-4
SLIDE 4 /

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Flood Control Responsibilities

NATIONAL WEATHER SERVICE - SEATTLE

Forecasts weather and river conditions

CORPS OF ENGINEERS -- SEATTLE

~ .~
  • • ______
..... ,_" _. _ .• _~.~. _
  • • 0"
... ,
  • ___
..... :za

Monitors weather, river ang re$ervoir$ Provides regulating instructions to dams

PUGET SOUND POWER & LIGHT AND SEATTLE CITY LIGHT

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  • ."._.- ... ___ '~
____ •. :'.~' ~.'.~:,: .. __ ,_ •. _.'._.,_~ ',~_~'~ __ ". "jJ!!Jiitt_, ad t 1 "iL ~ ...
  • ._.L

Maintains flood storage $paGe Operate dams - gate changes

SKAGIT COUNTY PUBLIC WORKS DEPT.

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  • .....
  • .
".,.

Provides 'flood information to the public Coordinates flood emergency activities

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slide-5
SLIDE 5

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Reservoir Regulation Guidelines

for Flood Control

  • Regulate flows forecast ,to exceed 80,000 c.f.l. (32.2 tHt) at Concrete

.

  • Reduce outflow from dame (Ixet"t minimum pow.r flowI)
  • Store floodwater in reservoir
  • Rel
  • e stored water when fltw ~t'

QenC?r,te rec.d

  • Maintain reealiion .t

Coner,te

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slide-6
SLIDE 6

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Ross Lake and Dam'

II.

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Normal Full Pool £

£ ~ ~
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1590

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  • 1585

1580 Flood Minimum Flood Storage Storage Pool Space 10.4 Feet October . November. December.' January February March

1980 1981

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SLIDE 7 ...

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Baker Lake and Upper Baker Dam

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730 725

II!- ..... • .... V" Normal Full Pool A v 'V:.at • ~

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............ .........v ---..
  • ••• • .............. • -- 1

720

J

71& .5

i710

~

Q) 705

~ 700 895

690 October

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  • ,_" •• _____
~_
  • •• ____
  • Flood

Storage Space 16 Feet

_._._ Mhiimum Flood

I

Stera§e POOl ..

~".
  • _.".,.-.. - ~ ........ -I--.-....
  • ~.-
... ~., .

November

I

December January February

1980

1981

,\,; .'.A ;I~ "~, ... '.

March

  • -----.-.... _··_--_
.. _-_ .. _· .. ·--1·------------_· __

·_-------

  • -.-...
  • .~-.-.-
... -"._----<--------- : j

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SLIDE 8 1 ",1."',., .

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.. Skagit River at

I

, Ross Dam

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December 1980 Flood

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50

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en

u.: 40.

d

Natural

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Inflow

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,

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1 ns ex: f ~

10

t

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25

26 27 28 29

30

Time in Days

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( . Skagit River at·'

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. Upper Baker Dam

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" December 1980 Flood

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20

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11 Natural

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25 28 27

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Dam ~UtfIOW

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  • ~-
28

29 30

Time In Days

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slide-10
SLIDE 10

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Skagit River at Concrete

December 1980 Flood .

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':'200" .

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  • ,mZ'''-<-' - ...... upon.

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Flow '. ,e' .,
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38.5 La.

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I-.·~C"'.~,·.~,.~

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Observed Flow ~I\

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cc:: ~-=-
  • .25

28 27

Time In Days

,

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30.81

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slide-11
SLIDE 11

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Skagit River at Mount Vernon

December 1980 Rood

180

.,. ..... - -'- '",........ '_,,-.. - "iii·.m

38 0

r a ¥ + .. -~ __ .,.~ .. \=~.+, .

c4 120

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c 80

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Observed
  • Flow
  • ·
ti:: 40 Q) 0') co (!)

21.7

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25

28

.

21

28 I - 29 30 ' 0"

Time in Cays

  • .......
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,

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. ,.( / ._.-/" J

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slide-12
SLIDE 12
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..

Skagit River at Concrete

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tv - .,."#'" ' ..... '------

En.cts of Reservoir Storage .

: 210·

en

LL: J

180 150

<J

§ 120

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01

I 10

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3() ~ I , ,. ~Observed Flow Natural

rlow

Control

f='t FlOW

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  • --:-

45

40

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30 0

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, 20

.

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  • 1970

1975 1980 .

Water Years

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slide-13
SLIDE 13

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Summary,'>,

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Corps ,eQ,ulat

  • • flowi above 90,000 c.f

.•.. : ~'

.', (32.2 ft.) It Coneret.

  • . . Dam. lncldtfttlw '.,VI
  • •• ftow. below 90,000 c.f.l.

".

e" Oams provldt 'flood domaC)1 reduction'

.:~ .. , ., . '.i ,"

e

But ~am.

COft"ot".Uminafe the possibify of floodino .

to 1'\. ~, . ~'1 ~', .....

~-~-

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