Canada. Manitoba. S. Topping (Water Resources)

Transcription

1 MANITOBA S PROGRESS TOWARDS LIVING WITH THE RED Steve Topping, P.Eng. LINKING SCIENCE TO WATER POLICY ICEWarm Conference Adelaide, SA November 20 th, 2008 S. Topping (Water Resources)

2 The Hudson Bay Drainage Basin Watershed Sub-Basins 1 3 % o f C a n a d a s

3 The Red Basin Almost 2/3 of s 0.9 million people are located in the Red Valley Winnipeg Population = 850,000 Rural Population = 50, % of Provincial i GDP (excluding Winnipeg) i Agriculture is predominant /- farm operations /- individual homes/businesses

4 Red Basin w (m3/s s) Pe eak Flo 7,000 6, , m3/s m3/s 5, m3/s 3,000 2, ,000 Historic Peak Flows at Winnipeg Little Flooding for 89 years Significant Flooding Begins

5 R ed Flood of the Century Elm Creek Channel Bryson Drain E A Drain Assiniboine La Salle Red Floodway Seine Seine Manning Canal 2,500 sq. km. (1,000 sq. mi.) of valley lands were inundated Created a lake some 80 km (50 miles) long and up to 40 km (25 miles) wide Diversion Norquay Channel D - 20 Drain Tourond Creek Tobacco Creek Graham non Shan Deadhorse Creek Shannon Creek Creek RosenheimDrain Hespeler Creek Drain Ck L. Morris R. Deadhorse Creek Morris Plum R. Red Marsh Roseau Main Rat R. Some 28,000 people evacuated over 8,000 military deployed to help 250 homes destroyed 630 homes flooded 1700 homes needed more protection ti Buffalo Dr.

6 1997 RED RIVER FLOOD

7 International Joint Commission Study Main Conclusions: Flooding is natural. Expect floods even larger than 1997 in future. Risk of failure of Winnipeg s flood protection system is high. Need for comprehensive binational cooperation.

8 International Joint Commission Study Main Recommendations: Promote a culture of flood preparedness in the valley. Improve flood protection for Winnipeg. Develop a comprehensive flood damage reduction plan for whole basin. Improve data networks. Develop digital elevation model for full basin.

9 Flood Protection Agreement $130 M ($65M Fed. + $65M Prov.) Consists of 5 program elements 1. Individual Homes & Businesses 2. Communities 3. City of Winnipeg 4. Environmental Impact Mitigation & Scientific Data 5. Provincial Infrastructure works

10 Program Element 1: Individual Homes & Businesses Financial assistance for individual flood protection (1997 flood level + 2 ft.) for homes & businesses located outside ring-diked communities maximum reimbursement of $60,000 per project - costs in excess of $70, were ineligible could qualify for more than one project (i.e.. Farm & Residence) Acceptable flood proofing methods: Constructing a ring dike around building(s) Raising home or building(s), i.e.. on a earth pad Relocating inside a ring-diked community or outside the flood zone Structural / Assembly dikes

11 I nflood Proofing Methods d i v i d u a l Diking Raising Terracing Retaining Wall Structural Dike

12 Program Element 1: Individual Homes & Businesses Physical anomaly: limitations such as limited lot size or riverbank instability Economic anomaly: where flood proofing exceeds property value - under investigation 60 economic & physical properties Anomalies

13 Program Element 2: Communities protecting & enhancing flood protection infrastructure for rural communities subject to flooding. 90% level of financial assistance for projects 10% local municipal contribution 10 new community projects constructed The 8 existing ring dikes also upgraded

14 Red Program Element 2: Communities Assiniboine Elm Creek Channel Bryson Drain E. Red Floodway Seine La Salle Seine Diversion St. Adolphe Manning 11 - A Drain g Canal Norquay Channel Tobacco Creek Graham Deadhorse Shan non Creek Creek Creek Shannonn Creek D i RosenheimDrain Hespeler Drain Ck Brunkild L. Morris Morris ris R. Morris Deadhorse Creek Rosenort Plum R. Red Letellier Marsh Roseau D - 20 Rat Drain Tourond Creek St. Jean Baptiste Roseau R. Dominion i City Main Existing Community Dikes Buffalo Emerson Dr.

15 Red Program Element 2: Communities New and Expanded Elm Creek Channel Community Dikes Bryson Drain E. Assiniboine La Salle Red Floodway Seine Seine Grande Point South Diversion of Floodway 11 - A Drain Norquay Channel Ste. Agathe D - 20 Drain Manning Canal Niverville Tobacco Creek Graham Shan non Creek Creek Shannon Creek L. Morris Morris Rosenort Lowe Farm R. Red Aubigny side Marsh Rat Tourond Creek R. St. Pierre-Jolys Deadhorse Creek Hespeler Drain Deadhorse Creek Plum R. Roseau RosenheimDrain Rosenfeld Buffalo Ck Gretna Emerson Main Dr. Dominion City

16 Emerson Flood Protection Dike

17 Program Element 3: City of Winnipeg Community Projects to enhance the level of protection and/or integrity of the secondary diking systems within the City of Winnipeg lover 800 properties affected Approximately 500 properties p were addressed on a community or individual flood protection basis

18 City of Winnipeg Secondary Ring Dike Locations 23 sites considered 9 sites short-listed 450 properties outside primary dike

19 Program Element 4: Environmental Impact Mitigation & Scientific Data $5 M allocated to address other public interests in the Red valley - Groundwater protection inventory of existing wells in the flood-prone area seal abandoned wells upgrade/protect wells from surface water flooding - GIS & Topography Data enhance existing databases,topographical information & monitoring networks to enhance flood preparedness collect detailed topographical information to support IJC hydraulic model Web based tool for flood fighters Web based tool for flood fighters cont d...

20 Program Element 4: Environmental Impact Mitigation & Scientific Data - Flood Forecasting Network enhance 43 hydrometric stations within the RR Basin reactivate/add an additional 34 hydrometric stations enhance climatological network to provide additional information for use in flood forecasting - Research on Red Floods 4 year research project to establish the paleo-record of flooding patterns in the Red Valley - Other studies Flood Risk Workshop for the City of Winnipeg Cumulative impact of the enhanced flood control works in the Red valley

21 Lidar Coverage Red and Pembina s

22 Mike-11 Model of Red Valley Model Results for May 4, 1997 Satellite Image Modeled

23 Web-based based GIS Tool

24 Program Element 4: Enhanced Hydrometric Network Environmental Impact Mitigation & Scientific Data Existing Stations Upgraded Stations Reactivated Stations New Stations

25 Program Element 5: Provincial Infrastructure Works Provincial Flood Control Projects Rehabilitated West Dike Extension Red Floodway Rip Rap Red Floodway Gates Portage Diversion & Shellmouth Dam Assiniboine Dikes

26 Designated Flood Area Legislation Amendments All new development is required to meet 1997 plus 2 feet flood protection level Regulation requires two stage permitting (1 st strip foundation, 2 nd main floor) Strict penalties for non-compliance

27 (IJC) International Joint Commission Task Force Flood Protection For The City of Winnipeg Report Report Highlights: Little margin for error for the City during the 1997 Flood 58 vulnerabilities identified for extreme flood events Major vulnerabilities Lack of floodway hydraulic capacity City s internal drainage system Catastrophic failure of flood control infrastructure Flood Magnitude Potential Damages Flood Probability 1997 $ 760 M 37% chance of occurring in next 50 Years 1826 $ 5.8 B 20% chance of occurring in next 50 years

28 Floodway Expansion - Channel Excavation

29 Floodway Expansion - Springhill Ski Hill

30 Floodway Expansion Inlet Control Structure

31 Floodway Expansion Outlet Structure Widening

32 Floodway Expansion Trans Bridge

33 Floodway Expansion West Dike Raising

34 Floodway Expansion - Centerline Drain Inlet

35 Ice Jam Mitigation - Amphibex

36 Concluding Remarks Within the designated flood zone, there is 95% compliance for structures t in the Red Valley. Enhance flood proofing will help facilitate with emergency diking for a flood of greater magnitude than that of To date Floodway Expansion has increased the City of Winnipeg Flood Protection to a 300 year level, 700 year by Better data bases, forecasting tools 100% of the IJC recommendations have or will be met

37 3-D View of 1826 Flood Questions?