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Recent Flooding and Flood Mitigation in Manitoba • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Eugene F

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Recent Flooding and Flood Mitigation in Manitoba • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Eugene F Recent Flooding and Flood Mitigation in Manitoba • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Eugene F. Kozera, P. Eng. Director, Water Control System Management Branch Water Stewardship Saskatchewan R. Souris Winnipeg Red 250,000 Red River: 1826 natural in 200,000 Winnipeg 1997 2 1852 0 2 0 150,000 0 9 1 1 1950 1979 100,000 Flow (cubic Flow(cubic feet per second) 50,000 0 50,000 45,000 Assiniboine River 1882 2011 40,000 at Brandon 35,000 1904 1995 30,000 25,000 1923 1955 1976 20,000 15,000 Flow (cubic Flow (cubic feet per second) 10,000 5,000 0 30,000 Souris River at Westhope 25,000 2011 20,000 1882 15,000 1976 10,000 Flow (cubic Flow (cubic feet per second) 5,000 0 Assiniboine River dikes east of Portage Assiniboine R. dikes 1950 flood Damages: over $700 M 100,000 people evacuated 10,000 homes flooded Winnipeg’s •Built in 1950 and 1951 Primary Dikes •Top of dikes: 4 ft below 1950 peak water level Cost: $4.6 million (Canada, Manitoba, City of Winnipeg) Winnipeg Portage Brandon Portage Winnipeg Portage Brandon Diversion Winnipeg Portage Brandon Assiniboine River River Red Elm Creek Channel River Bryson Drain E. Red Floodway Seine River La 1966 Red River Valley flood Salle Seine River Diversion River St. Adolphe Manning Canal 11 - A Drain Norquay Channel Brunkild D - 20 Drain Tourond Creek Rat Morris R. R. Rosenort Morris L. River River Tobacco Creek Creek Red Graham Morris Creek 1967-72: $5.4 M non Creek Shan River Shannon St. Jean Baptiste Marsh Deadhorse Creek 1980-89: $5.4 M R. Deadhorse Creek Plum Drain River Hespeler Roseau Drain Letellier Dominion Ck Main Rosenheim Dr. City Buffalo Morris Emerson 1997 Red River Valley flood Morris Flood preparation, fighting, damages: $500 M Ste. Agathe Evacuations: 28,000 people Assiniboine River River Red Elm Creek Channel River Bryson Drain E. Red Floodway Seine River La Salle Seine River Diversion River Community flood protection Manning Canal 11 - A Drain Niverville 14 new or expanded Norquay Channel Ste. Agathe D - 20 Drain communities dike Tourond Creek Rat Morris Rosenort Aubigny R. $35.5 M R. Morris L. River River St. Pierre Tobacco Creek Riverside Creek Red Jolys Graham Creek non Creek Shan Lowe Farm River Shannon Marsh Deadhorse Creek R. Deadhorse Creek Rosenfeld Plum Drain River Hespeler Roseau Drain Dominion Ck Main Rosenheim Dr. City Buffalo Gretna Emerson Raising Diking Individual flood protection: 1,750 structures; $59 M Retaining wall Structural dike Winnipeg secondary ring dikes – 23 sites considered – 9 sites short-listed – $10.4 M Existing Stations Enhanced hydrometric network Upgraded Stations Reactivated Stations New Stations Manitoba Floodway Expansion - Channel Excavation $665 M - bridges - Inlet control structure - west dike % of normal soil Moisture at freeze-up 5th wettest September through February May 2011: % of normal precipitation June 19: major rain storm June 2011 Precipitation: % of normal 175 171 165 310 215 324 191 142 172 50,000 45,000 Assiniboine River (330-year) 1882 2011 40,000 at Brandon 35,000 1904 1995 30,000 25,000 1923 1955 1976 20,000 15,000 Flow (cubic Flow (cubic feet per second) 10,000 5,000 0 30,000 Souris River at Westhope 25,000 (213-year) 2011 20,000 1882 15,000 1976 10,000 Flow (cubic Flow (cubic feet per second) 5,000 0 ac - 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000 ft 6,000,000 7,000,000 8,000,000 9,000,000 1,000,000 2,000,000 3,000,000 4,000,000 5,000,000 6,000,000 7,000,000 8,000,000 9,000,000 - - 1961 1962 River Assiniboine the Down Flowing of Water Volume Total 19631961 Assiniboine River Between April and April and River Between Assiniboine 1964 the Down Flowing of Water Volume Total 19651963 19661965 1967 19681967 1969 19701969 1971 Annually and July April Between 19721971 1973 19741973 1976 1975 19761975 1977 19781977 1979 19801979 1981 19821981 1983 19841983 1985 19861985 1987 19881987 1989 19901989 1991 1995 19921991 1993 19941993 1995 19961995 1997 1998 8.3 1999 2011: 2011: 1999 July 2000 2001 2001 M 2002 2003 2004 ac 2005 2006 - 2007 ft 2008 2009 2011 Upper portion of Souris River Basin Gets Slammed cfs Minot, North Dakota Brandon Brandon: major dike raising (earth and super sand bags) Souris Wawanesa Melita Capacity = Design = 25,000 cfs 18,000 cfs 2011: 34,000 cfs Winnipeg Brandon 2011 peak flow near 53,000 Portage Diversion Assiniboine River Dikes – Massive Effort to Reinforce Canadian Armed Forces Called in to Help cfs Portage Diversion: reinforcing drop structures Portage Diversion: raising dikes along channel Capacity = Design = 25,000 cfs 18,000 cfs 2011: 34,000 cfs Winnipeg Brandon Hoop and Holler release: 400 cfs 2011 peak flow near 53,000 Portage Diversion Controlled release at Assiniboine River dikes (at Hoop and Holler) Lake Winnipegosis Waterhen R. Dauphin Lake Whitemud Portage Diversion May 31st: Lake Manitoba at 815.3 ft, and major wind storm Lake Manitoba peaked at 817.15 ft btwn July 12 - 25 (wind eliminated) cfs Peak: 817.15 ft. May 31 Storm cfs Waterhen R. Lake St. Martin Portage Diversion Lake St. Martin Ralls Island diking Saskatchewan R. Carrot River temp dikes Souris Winnipeg Red At height of flooding, 840 municipal and provincial roads closed or affected Total evacuees: 7,165 Local states of emergency: 70 Long flood!! Man. Emergency Coordination Centre was open 103 days (44 in 1997) Flood Mitigation • Individual Flood Protection – $75M in financial assistance • For raising, diking, terracing or moving • Homes, and farm and business buildings: 86%, up to $100,000 project • Cottage: 86%, up to $40,000 project • Lake Manitoba: first $20,000 is 100% grant • 1,600 applications to date • New community flood protection • 2010: 8 feasibility studies • 2011: application deadline is November 30th • Construction: $30M in 90% grants • Converting emergency dikes into permanent dikes • $20M for 17 projects • Communities such as Souris, Melita, Wawanesa, Lake Manitoba Narrows, Peltz Drive/St. Peter’s Road Flood Mitigation • Community diking • Brandon: grant for raising to new design level • Petersfield: grant for construction/raising to new design level • Shellmouth: install gates on the spillway ($8 M) • Portage Diversion: assessment and upgrading ($7.4 M) • Lake St. Martin emergency channel - $100M • Fairford Control Bypass - $60M Lake Dauphin R. Winnipeg Flood Mitigation Continues... Emergency outlet channel Lake St. Martin Emergency Channel from Lake St. Martin Lake Manitoba to Big Buffalo Lake N Fairford R. Fairford Bypass Projected Lake Manitoba water levels Thank You Questions?.
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