River & Stream Systems: Flooding Hazard Limit - …

1 20021 technical Guide - River and Stream Systems: Flooding Hazard LimitOntario Ministry of Natural ResourcesTechnical GuideRiver & Stream Systems: Flooding Hazard LimitOntario Ministry of Natural ResourcesWater Resources Section300 W ater Street, 5th Floor, South Tower, Box 7000 Peterborough, Ontario K9J 8M5 20022 technical Guide - River and Stream Systems: Flooding Hazard LimitOntario Ministry of Natural ResourcesContentsA: 8 Acknowledgement .. 7B: POLICIES AND PERFORMANCE STANDARDS1. 102. PROVINCIAL NATURAL Hazard Natural Hazard Policies .. Provincial Interests - Flooding hazards .. Flood Standards for River Systems .. Flood Hazard limits for Lakes < 100 sq. km.. Official Plan Flooding Hazard Limit Policies .. One Zone ConceDpt.

2 Two Zone Concept .. Special Policy Area Concept .. Access and Floodproofing .. Safety .. 143. DEFINITIONS OF THE Flooding Hazard Introduction .. Selecting the Flood Standards .. Historical Storms .. Return Period Floods .. 164. SPECIAL FLOOD Hazard Flood Hazard Standards Downstream of aControl Structure .. Dams .. Dykes and Flood Walls .. Bridges and Culverts .. Confluence of Lakes, Rivers and Streams .. Confluence of Rivers .. Floodproofing of Buildings .. StormWater Management Ponds5. DESIGN STANDARDS FOR DAMS ..186. DESIGN STANDARDS FOR 19C: HYDROLOGIC AND HYDRAULIC PROCEDURES1. General .. Floods Based on Exceedance Probability of Occurrence .. Flood Produced by a Specified Meteorological Event.

3 Observed Floods .. 202. DATA Streamflow Records .. Historical Floods .. Specified Meteorological Event .. Stage-Discharge Relationships .. Hydraulic Coefficients .. Elevations of High Water Marks .. Aerial Photographs .. Cross-Section .. Regulated Flows .. and Physiographic Data .. Levels .. 233. FLOOD Flood Frequency Analysis .. Runoff Simulation From a Specified Meteorologic Event . 264. HYDRAULIC Type of Flow .. Cross-Sections .. Critical Depth .. Velocity Distribution .. Roughness .. Use of High Water Marks .. Plotting Routines .. Bridge Losses .. Culvert Losses .. Channel Flow .. Factors .. 29D: FLOW COMPUTATION DATA REQUIREMENTS1. RAINFALL Introduction .. Historical Storms.

4 Return Period Storms .. Probable Maximum Rainfall .. Snowmelt and Winter Precipitation .. 442. SOIL 493. LAND 50 20023 technical Guide - River and Stream Systems: Flooding Hazard LimitOntario Ministry of Natural ResourcesE: METHODS OF COMPUTING FLOOD FLOWS1. 512. HYDROLOGIC Types of Hydrologic Models .. Computational Procedures Used in Models .. Recommended Model Selection .. Model Calibration .. 59F: WATER LEVEL COMPUTATIONS - OPEN WATER1. 612. BACKWATER 613. FLOOD 614. CHOOSING A HYDRAULIC MODELLING 625. RESERVOIR 646. EFFECT OF LAKES AND 647. WATERWAY CROSSINGS AND 658. MODEL 659. TESTING AND 66G: WATER LEVEL COMPUTATIONS - ICE JAMS1. 672. ICE JAM 693. SUMMARY OF ICE JAM COMPUTATION 744.

5 STAGE-FREQUENCY OF ICE JAM FLOOD Historically Based Estimates .. Deterministic Estimates .. Annual Flood Stage Probability Distribution .. 795. PROCEDURE FOR ESTIMATING THE FREQUENCYOF ICE-EFFECT 796. DATA COLLECTION FOR ICE-EFFECT 817. 82H: technical REPORT AND DOCUMENTATION1. technical 83I: IMPLEMENTATION OF FLOOD PLAIN POLICIES AND MAPPINGJ: SURVEYS AND MAPPING Under review 20025 technical Guide - River and Stream Systems: Flooding Hazard LimitOntario Ministry of Natural ResourcesAPPENDICESAPPENDIX 1 BIBLIOGRAPHYAPPENDIX 2 GLOSSARYAPPENDIX 3 APPLICATION TO CHANGE THE FLOOD STANDARD WITHIN A WATERSHEDAPPENDIX 4 APPLICATION OF THE TWO ZONE CONCEPTFACTORS TO BE CONSIDEREDAPPENDIX 5 SPECIAL POLICY AREAS, FACTORS TO BE CONSIDEREDAND PROCEDURES FOR APPROVALAPPENDIX 6 FLOODPROOFING 20026 technical Guide - River and Stream Systems.

6 Flooding Hazard LimitOntario Ministry of Natural ResourcesImagesLIST OF TABLESNATURAL Hazard POLICIES AND STANDARDSTABLE B-1 DESIGN RETURN PERIOD IN YEARS (T)FOR DIFFERENT DESIGN LIFE AND RISK VALUESTABLE B-2 DESIGN FLOOD CRITERIA FOR ONTARIO DAMSTABLE B-3 DESIGN FLOOD FOR ROAD CROSSINGSFLOW COMPUTATION DATA REQUIREMENTSTABLE D-1 COMPARISON OF STORMS USED FORFLOOD PLAIN AND PROBABLE MAXIMUMPRECIPITATION COMPUTATIONTABLE D-2 HURRICANE HAZEL RAINFALL DEPTHSTABLE D-3 HURRICANE HAZEL - AREAL REDUCTIONTABLE D-4 TIMMINS - RAINFALL DEPTHSTABLE D-5 TIMMINS - AREAL REDUCTIONTABLE D-6 RAINFALL DISTRIBUTIONS (PERCENT)TABLE D-7 ONTARIO VALUES FOR PARAMETER a (minutes)TABLE D-8 AES SNOWMELT EQUATIONSTABLE D-8 ONTARIO SOIL SURVEYSMETHODS OF COMPUTING FLOOD FLOWSTABLE E-1 ALTERNATIVE METHODS OF FLOOD AND WATER.

7 LEVEL CALCULATIONSTABLE E-2 COMPUTATION OF DIFFERENT CRITERIA FLOODSTABLE E-3 SUMMARY OF 100 YEAR PRIMARY AND SECONDARYFLOOD PEAK COMPUTATIONTABLE E-4 LIST OF HYDROLOGIC MODELSTABLE E-5 HYDROLOGIC MODEL SELECTION MATRIXWATER LEVEL COMPUTATIONS - OPEN WATERTABLE F-1 HYDRAULIC MODEL SELECTION MATRIXLIST OF FIGURESNATURAL Hazard POLICIES AND STANDARDSFIGURE B-1 FLOOD Hazard CRITERIA ZONES OF ONTARIOFIGURE B-2 ONE ZONE FLOODPLAIN CONCEPTFIGURE B-3 TWO-ZONE FLOODWAY-FLOOD FRINGE CONCEPTFIGURE B-4 SELECTION OF FLOOD STANDARDS AT CONFLUENCEOF LAKES, RIVERS AND STREAMSFLOW COMPUTATION DATA REQUIREMENTSFIGURE D-1 DESIGN STORM SELECTIONFIGURE D-2 HURRICANE HAZEL STORM HYETOGRAPH ANDDIMENSIONLESS DISTRIBUTIONFIGURE D-3 HURRICANE HAZEL AREAL REDUCTIONFIGURE D-4 TIMMINS STORM HYETOGRAPH ANDDIMENSIONLESS DISTRIBUTIONFIGURE D-5A 24 HOUR DURATION MEAN ANNUALEXTREME RAINFALLFIGURE D-5B 24 HOUR RAINFALL STANDARD DEVIATIONFIGURE D-6 AREAL REDUCTION CURVESFIGURE D-712 HOUR STORM DISTRIBUTIONFIGURE D-81 HOUR URBAN DESIGN STORMFIGURE D-9 GENERALIZED PROBABLE MAXIMUMPRECIPITATION, ALL ONTARIOFIGURE D-10 100 YEAR SNOWPACK WATER EQUIVALENT MAPPINGWATER LEVEL COMPUTATIONS - ICE JAMSFIGURE G-1 SCHEMATIC ILLUSTRATION OF AN EQUILIBRIUM ICE JAMFIGURE G-2 DIMENSIONLESS DEPTH VERSUS DIMENSIONLESS.

8 DISCHARGE: River ICE JAMS IN EQUILIBRIUMFIGURE G-3 FREEZE UP AND BREAK UP STAGES VERSUSDISCHARGES; THAMES River AT THAMESVILLE ONTARIOFIGURE G-4 PROBABILITY DISTRIBUTION OF ANNUAL MAXIMUMICE-EFFECT STAGE AND OPEN WATER STAGEFIGURE G-5 COMPARISON OF SYNTHESIZED AND MEASURED ICERELATED STAGE PROBABILITY DISTRIBUTIONSFIGURE G-6 PROCEDURE FOR ESTIMATING THE FREQUENCY OFBREAK UP ICE JAM STAGES 20027 technical Guide - River and Stream Systems: Flooding Hazard LimitOntario Ministry of Natural ResourcesAcknowledgementsThe technical Guide, River and Stream Systems; Flooding Hazard Limit updates the 1986 Flood Plain Management inOntario technical Guidelines, Ontario Ministry of Natural Resources (OMNR) and supports the Natural Hazard Policiesof the Provincial Policy Statement of the Planning Act.

9 Ivan Lorant of Dillon Consulting Ltd. updated the TechnicalGuide, River and Stream Systems; Flooding Hazard Limit , under the direction and guidance provided by a steeringcommittee of OMNR Water Resources staff of the Lands and Waters Branch, including:Ala Boyd (Chair)Pearl McKeenLes PatakyDon GreerJohn DingRon McGirrThe original 1986 Flood Plain Management in Ontario technical Guidelines were prepared by the Conservation Au-thorities and Water Management Branch, Ministry of Natural Resources, under the supervision of Sardesai. Theprincipal writer was Ivan Lorant, , Chief Water Resources Engineer, Dillon Ltd. Guidance during prepara-tion of the guidelines was provided by a steering committee comprised of:Ivan Lorant (Chairman) Dillon SardesaiOntario Ministry of Natural DingOntario Ministry of Natural ResourcesH.

10 WalshOntario Ministry of Natural ResourcesDr. A. SmithConservation AuthorityC. MatherConservation AuthorityR. WigleMacLaren & Associates the preparation of the guidelines and during subsequent review, input was also received from a number ofindividuals and agencies including provincial ministries, conservation authorities, Consulting Engineers of Ontario andvarious specialists, particularly:Dr. E. WattDr. P. WisnerDr. T. DickinsonProctor & Redfern Ltd. (Mr. A, Perks)A. Robinson & Associates Ltd. (Mr. A. Robinson)Mr. S. BaltaosDr. L. GerardDr. N. KouwenMr. D. CalkinsParagon Engineering Ltd. (Mr. J. Gorrie) Kirchhefer Ltd. (Mr. S. Kirchhefer).All contributions, present and past are gratefully information concerning the Natural hazards Policies or the technical Guide, River and Stream Systems; FloodingHazard Limit , please contact the Water Resources Section of the Lands and Waters Branch, Ministry of Natural Re-sources, in Peterborough, Ontario at (705) 755-1222.