Figs. Tables Flood Duration - Latest News · Tables Flood Duration Peak Flow Start # of emp freq emp freq emp freq Type Duration (days) Magnitude (cms) Season occur. 1 or more ...

Tables

Flood Duration Peak Flow Start # of emp freq emp freq emp freq Type

Duration (days)

Magnitude (cms) Season occur. 1 or more 2 or more 3 or more

S1 short < 7 small to med < 100 All seasons 278 0.91 0.72 0.54

S2 short < 7 large 100-400 Fall to Early Spring 31 0.29 0.03 0.00

M1 medium 7-20 small to med < 100 Winter to Late

Spring 42 0.33 0.09 0.01

M2 medium 7-20 large 100-400 Winter 44 0.36 0.07 0.02

M3 medium 7-20 very large > 400 Fall to Winter 5 0.05 0.00 0.00

L1 long 21-70 small to med < 100 Early Spring 20 0.18 0.02 0.00

L2 long 21-70 large 100-400 Winter to Early Spring 31 0.28 0.04 0.00

L3 long 21-70 very large > 400 Winter 12 0.11 0.01 0.00

V2 very long > 70 large 100-400 Winter to Early Spring 10 0.10 0.00 0.00

V3 very long > 70 very large > 400 Winter to Early Spring 6 0.06 0.00 0.00

2 or 3 large-very large > 100 139 0.66 0.47 0.22

3 very large > 400 23 0.21 0.02 0.00

L or V long-very long > 20 79 0.58 0.22 0.00

V very long >70 16 0.16 0.00 0.00

ALL 479 0.94 0.88 0.83

Table 1. Nine flood types of the Cosumnes River and each respective duration, magnitude, timing, and empirical frequency in any given year.

Figs. Page 1

Draft MS submitted to San Francisco Estuary & Watershed Science

Water Year Type

# of occurrences empirical frequency

WYT-1 32 0.33 WYT-2 15 0.15 WYT-3 10 0.10 WYT-4 20 0.20 WYT-5 7 0.07 WYT-6 5 0.05 WYT-7 4 0.04 WYT-8 5 0.05

Table 2. Water Year Types with number of occurrences and empirical frequency based on 98-year streamflow record.

Figs. Page 2


Figures

Figure 1. Cosumnes River Watershed showing locations of Cosumnes River Preserve (CRP) Floodplain and Michigan Bar gage.

0

100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

1400

1500

1600

1700

1800

Flo

w (

cms)

01/1

908

01/1

910

01/1

912

01/1

914

01/1

916

01/1

918

01/1

920

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922

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924

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926

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928

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930

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932

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01/1

938

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940

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956

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962

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01/1

970

01/1

972

01/1

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01/1

976

01/1

978

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982

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984

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990

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992

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994

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996

01/1

998

01/2

000

01/2

002

01/2

004

Date

Figure 2. Hydrograph of daily discharge data of Cosumnes River at Michigan Bar (WY1908-2005)

Michigan Bar Gage CRP Floodplain

0 50 10025 km

Figs. Page 3


Duration vs Magnitude vs Timing

10

100

1000

10000

1 10 100 1000

Flood Duration (days)

Pea

k D

aily

Flo

w (

cms)

Fall Winter Early Spring Late Spring

S1

S2

M1

M2

M3

L1

L2

L3

V2

V3

Figure 3. Plot of 479 events on Cosumnes River at Michigan Bar (WY1908-2005) separated into nine flood types. Fall = OCT, NOV; Winter = DEC, JAN, FEB; Early Spring = MAR, APR; Late Spring = MAY, JUN

Figs. Page 4


Mo

nth

ly V

olu

me

(m^3

)

0

1e+8

2e+8

3e+8

4e+8

5e+8

6e+8

1-OCT 2-NOV 3-DEC 4-JAN 5-FEB 6-MAR 7-APR 8-MAY 9-JUN

Water Year Month

Figure 4. Monthly water volumes for 98-year streamflow record for Cosumnes River at Michigan Bar.

Pea

k D

aily

Flo

w (

cms)

100

80

60

50

40

30

1000

800

600

500

400

300

200


Water Year Month

Figure 5. Peak daily flow versus starting month with box plots for all 479 flood events.

Figs. Page 5


Flo

od

Du

rati

on

(d

ays)

1

108

6

4

3

2

10080

60

40

30

20


Water Year Month

Figure 6. Flood duration versus starting month with box plots for all 479 flood events.

250

500

750

1000

1250

# o

f o

ccu

rren

ces


Figure 7. Frequency distribution of days of flooding per water year month

Figs. Page 6


Figure 8. Average hydrographs representing each flood type.

Type S1

010203040506070

0 2 4 6

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)

MeanQ MeanQ+SD MeanQ-SD

Type S2

0

50

100

150

200

0 2 4 6

Day of Flood

Mea

n D

aily

D

isch

arge

(cm

s)


Type M1

010203040506070

0 5 10 15 20

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)


Type M2

0

50

100

150

200

0 5 10 15 20

Day of Flood

Mea

n D

aily

D

isch

arge

(cm

s)


Type M3

0

200

400

600

800

0 5 10 15 20

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)


Type L1

010203040506070

0 20 40 60

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)


Type L2

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50

100

150

200

0 20 40 60

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)


Type L3

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200

400

600

800

0 20 40 60

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)


Type V2

0

50

100

150

200

0 50 100 150

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)


Type V3

0100200300400500600700800

0 50 100 150

Day of Flood

Mea

n D

aily

D

isch

arg

e (c

ms)


Figs. Page 7


Figure 9. Flood type statistics (flood type code, # of occurrences, mean # of peaks, mean start date (WY fraction and date), mean flood duration, mean peak flow, mean average flow, mean storm volume

Figs. Page 8


Figure 10. Hierarchical clustering of similar water years and general descriptions of each water year type.

WYT-5

WYT-7

WYT-3

WYT-4

WYT-8

WYT-2

WYT-6

WYT-1

WYT-2

WYT-6

WYT-1

WYT-3

WYT-4

WYT-8

WYT-5

WYT-7

driest water year type, S1 dominant but no other flood types usu. present

large floods (L3 dominant) in early part of year but dry in later part of year

relatively dry year, S1 and S2 dominant with a few M1, M2, L1, L2 events

latest center of mass, L1 dominant with several S1, M1, M2 events present

M2 and L2 dominant with several M1 events present

wettest water year type, V3 dominant, relatively late center of mass

M3 dominant in early part of year with several V2 and V3 events present

V2 dominant with several L3 events present, relatively late center of mass

Figs. Page 9


tota

l an

nu

al w

ater

vo

lum

e (k

m^3

)

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

WYT-1 WYT-2 WYT-3 WYT-4 WYT-5 WYT-6 WYT-7 WYT-8

Water Year Type

Figure 11. Total annual water volume (km^3) for each water year type.

cen

ter

of

mas

s (W

Y d

ay)

110

120

130

140

150

160

170

180

190

200

210

WYT-1 WYT-2 WYT-3 WYT-4 WYT-5 WYT-6 WYT-7 WYT-8

Water Year Type

Figure 12. Day of water year that corresponds with the center of flow mass for each water year type.

Figs. Page 10


Figure 13. Average annual hydrographs for each water year type.

WYT-1

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)

mean mean+SDmean-SD center of mass

WYT-2

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)


WYT-3

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)


WYT-4

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)


WYT-5

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)


WYT-6

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)


WYT-7

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)


WYT-8

050

100150200250300350400

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Day of Water Year

Str

eam

flo

w (

cms)


Figs. Page 11


Figs. Tables Flood Duration - Latest News · Tables Flood Duration Peak Flow Start # of emp freq emp freq emp freq Type Duration (days) Magnitude (cms) Season occur. 1 or more ...

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