manitoba’s 2011 flood

Manitoba’s 2011 FloodMark Lee, M.Sc., P.Eng.

Manager, Surface Water ManagementManitoba Conservation and Water Stewardship

January 29th, 2013

Manitoba Water Stewardship

140

67

250 220

210

180145 145

52

400+

30

43

75

22

250

25

1252011 Flood Return Periods


Assiniboine River Dikes


Shellmouth Dam and ReservoirDam• Constructed 1964-1972 by PFRA ($10.8 Million)• 1.3 km wide• 21.3 m high• Spillway – 64 m wide, 170 m long, 16.6 m high• Conduit – 4.6 m in diameter, 204 m long, 6000 cfs capacity

Reservoir• Named “Lake of the Prairies”• 390,000 acre-feet of storage• 72.4 km long• 2.4 km wide


Shellmouth Reservoir Annual Peak Inflows and Outflows

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

22,000

24,000

1971

1973

1975

1977

1979

1981

1983

1985

1987

1989

1991

1993

1995

1997

1999

2001

2003

2005

2007

2009

2011

Peak

Flow

s in

cfs

Shellmouth Reservoir --- Peak Inflows and Outflows

Peak Inflow Peak Outflow


2011 Shellmouth Reservoir OperationSHELLMOUTH RESERVOIR

0

5,000

10,000

15,000

20,000

25,000

2011-04-07 2011-05-05 2011-06-02 2011-06-30

Date

Flow

(cfs

)

1385

1390

1395

1400

1405

1410

1415

Leve

l (ft)

Inflow

Outflow

Land Drainage Level

Water Level

Spillway Crest


0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000M

ar-0

1

Apr-0

1

May

-01

Jun-

01

Jul-0

1

Aug-

01

Sep-

01

Oct

-01

Flow

(cfs

)

2011 Brandon Hydrograph

Observed FlowUnregulated Flow (without Shellmouth)


Major flooding within Brandon floodplain


Portage Diversion• Construction finished in

1970 ($20.5 million)• Two control structures:

– Bascule gates control river flow

– Vertical gates control diversion flow

• Diversion channel is 29 km long from Portage la Prairie to Lake Manitoba

• Diversion design capacity is 25,000 cfs


WinnipegBrandon

Assiniboine R.

Red

R.

Portage

DiversionCapacity: 18,000 cfs

Souris R. Wawanesa

Portage~38,000 cfs

~15,000 cfs

Designcapacity

25,000 cfs

Forecast:54,000 normal weather

56,000 unfavourable weather

Manitoba Water StewardshipCapacity increased to over 34,000 cfs!


WinnipegBrandon

Assiniboine R.

Red

R.

Portage

DiversionCapacity: 18,000 cfs

Souris R. Wawanesa

Portage~38,000 cfs

~15,000 cfs

Design capacity: 25,000 cfs

Increased to ~34,000 cfs

Hoop and Hollerrelease


Serious Decision Making

Release Point

Portage

N

Manitoba Water StewardshipControlled release of Assiniboine River at Hoop and Holler

May 14 – May 20

Manitoba Water StewardshipFloodway Operation


1826 1852 *1997 *2009 1861 *2011 1950 *1979 *1996 *20060

50

100

150

200

250

225,000

165,000163,000

128,000125,000116,000108,000108,000108,00099,000

36.5' 34.5' 34.4' 32.5' 32.2' 31.2' 30.3' 30.3' 30.3' 28.5'

Red River at James Ave.natural peak flow

*Computed Natural Discharge Without Use of Red River Floodway, Portage Diversion, Shellmouth DamComplied by Manitoba Water Stewardship

1826 1852 1950 19791997 2009 20111861 1996 2006

With Red River Floodway in operation


7.08.09.0

10.011.012.013.014.015.016.017.018.019.020.021.022.023.024.025.026.027.028.029.030.031.032.033.0

5-Ap

r6-

Apr

7-Ap

r8-

Apr

9-Ap

r10

-Apr

11-A

pr12

-Apr

13-A

pr14

-Apr

15-A

pr16

-Apr

17-A

pr18

-Apr

19-A

pr20

-Apr

21-A

pr22

-Apr

23-A

pr24

-Apr

25-A

pr26

-Apr

27-A

pr28

-Apr

29-A

pr30

-Apr

1-M

ay2-

May

3-M

ay4-

May

5-M

ay6-

May

7-M

ay8-

May

9-M

ay10

-May

11-M

ay12

-May

13-M

ay14

-May

15-M

ay16

-May

17-M

ay18

-May

19-M

ay20

-May

21-M

ay22

-May

23-M

ay24

-May

25-M

ay26

-May

27-M

ay28

-May

29-M

ay30

-May

31-M

ay1-

Jun

2-Ju

n3-

Jun

4-Ju

n5-

Jun

6-Ju

n7-

Jun

8-Ju

n9-

Jun

10-J

un11

-Jun

ELEV

ATI

ON

(JA

PSD

FEE

T)

NATURAL

RECORDED

River Walkway Level

Note: JAPSD is the James Avenue Pumping Station Datum

River Walkway Level


2011 Winnipeg Water Levels

7.08.09.0

10.011.012.013.014.015.016.017.018.019.020.021.022.023.024.025.026.027.028.029.030.031.032.033.0

5-Ap

r6-

Apr

7-Ap

r8-

Apr

9-Ap

r10

-Apr

11-A

pr12

-Apr

13-A

pr14

-Apr

15-A

pr16

-Apr

17-A

pr18

-Apr

19-A

pr20

-Apr

21-A

pr22

-Apr

23-A

pr24

-Apr

25-A

pr26

-Apr

27-A

pr28

-Apr

29-A

pr30

-Apr

1-M

ay2-

May

3-M

ay4-

May

5-M

ay6-

May

7-M

ay8-

May

9-M

ay10

-May

11-M

ay12

-May

13-M

ay14

-May

15-M

ay16

-May

17-M

ay18

-May

19-M

ay20

-May

21-M

ay22

-May

23-M

ay24

-May

25-M

ay26

-May

27-M

ay28

-May

29-M

ay30

-May

31-M

ay1-

Jun

2-Ju

n3-

Jun

4-Ju

n5-

Jun

6-Ju

n7-

Jun

8-Ju

n9-

Jun

10-J

un11

-Jun

ELEV

ATI

ON

(JA

PSD

FEE

T)

NATURAL

RECORDED

1950

River Walkway Level


River Walkway Level



Benefits of Flood Infrastructure• Since 1970, flood infrastructure has

prevented $40 billion dollars in damage• 2011 flood:

– Flood damages totalled approximately $1 billion

– Without Shellmouth Dam, Portage Diversion, Brandon Dikes, Assiniboine River Dikes, and Red River Floodway, damages are estimated at $6 billion dollars, with $3.7 billion in Winnipeg alone.

Thank You!

Mark Lee, M.Sc., P.Eng.Manager, Surface Water ManagementWater Science and Management BranchConservation and Water StewardshipBox 14, 200 Saulteaux CrescentWinnipeg, Manitoba R3J 3W3 Ph. (204) 945-5606, Fax (204) 945-7419E-mail [email protected]

mailto:[email protected]

manitoba’s 2011 flood

Documents

manitoba water stewardshiphere

manitoba water stewardshipeven

water levels

cfs of flow

assiniboine dikes

peak flow forecast

combined capacity

portage diversionconstruction