ALBERT

Note: Contents: 1 Global Distribution of Lakes / M. MEYBECK. - 1 Introduction. - 2 Background Material and Approaches to Global Lake Census. - 2.1 Data Used. - 2.2 Approaches to Global Lake Census. - 3 General Laws of Lake Distribution. - 3.1 Lake Density . - 3.2 Limnic Ratio. - 4 Distribution of Lakes of Tectonic Origin. - 5 Lakes of Glacial Origin. - 5.1 Lake Densities. - 5.2 Global Deglaciated Area. - 5.3 Total Number of Glacial Lakes. - 6 Fluvial Lakes. - 7 Global Distribution of Crater Lakes. - 8 Global Distribution of Saline Lakes. - 8.1 Coastal Lagoons. - 8.2 Salinized Lakes due to Evaporation. - 9 Global Lake Distribution. - 9.1 Extrapolation Approach. - 9.2 Lake Type Approach. - 9.3 Climatic Typology Approach. - 9.4 Lake Distribution in Endorheic Areas. - 9.5 Global Dissolved Salt Distribution in Lakes. - 10 Major Changes in Global Lake Distribution in the Geological Past. - 10.1 Lake Ages. - 10.2 Historical Changes. - 10.3 Postglacial Changes. - 11 Discussion and Conclusions. - References. - 2 Hydrological Processes and the Water Budget of Lakes / T. C. WINTER. - 1 Introduction. - 2 Hydrological System with Regard to Lakes. - 2.1 Interaction of Lakes with Atmospheric Water. - 2.2 Interaction of Lakes with Surface Water. - 2.3 Interaction of Lakes with Subsurface Water. - 2.4 Change in Lake Volume. - 3 Summary. - References. - 3 Hydrological and Thermal Response of Lakes to Climate: Description and Modeling / S. W. HOSTETLER. - 1 Introduction. - 2 Hydrological Response. - 3 The Hydrological Budget. - 4 Hydrological Models. - 5 Thermal Response. - 5.1 Energy Budget and Energy Budget Models. - 5.2 Models and Modeling. - 6 Use of Models to Link Lakes with Climate Change. - 7 Input Data Sets. - 8 Sample Applications. - 9 Summary. - References. - 4 Mixing Mechanisms in Lakes / D. M. IMBODEN and A. WÜEST. - 1 Transport and Mixing. - 2 Lakes as Physical Systems. - 3 Fluid Dynamics: Mathematical Description of Advection and Diffusion. - 3.1 Equations of Fluid Motion. - 3.2 Turbulence, Reynolds' Stress, and Eddy Diffusion. - 3.3 Vertical Momentum Equation. - 3.4 Nonlocal Diffusion and Transilient Mixing. - 4 Density and Stability of Water Column. - 4.1 Equation of State of Water. - 4.2 Potential Temperature and Local Vertical Stability. - 5 Energy Fluxes: Driving Forces Behind Transport and Mixing. - 5.1 Thermal Energy. - 5.2 Potential Energy. - 5.3 Kinetic Energy. - 5.4 Turbulent Kinetic Energy Balance in Stratified Water. - 5.5 Internal Turbulent Energy Fluxes: Turbulence Cascade. - 6 Mixing Processes in Lakes. - 6.1 Waves and Mixing. - 6.2 Mixing in the Surface Layer. - 6.3 Diapycnal Mixing. - 6.4 Boundary Mixing. - 6.5 Double Diffusion. - 6.6 Isopycnal Mixing. - 7 Mixing and Its Ecological Relevance. - 7.1 Time Scales of Mixing. - 7.2 Reactive Species and Patchiness. - 7.3 Mixing and Growth: The Search for an Ecological Steering Factor. - References. - 5 Stable Isotopes of Fresh and Saline Lakes / J. R. GAT. - 1 Introduction. - 1.1 Isotope Separatio During Evaporation. - 2 Small-Area Lakes. - 2.1 Seasonal and Annual Changes. - 2.2 Deep Freshwater Lakes. - 2.3 Transient Surface-Water Bodies. - 3 Interactive and Feedback Systems. - 3.1 Network of Surface-Water Bodies. - 3.2 Recycling of Reevaporated Moisture into the Atmosphere. - 3.3 Large Lakes. - 3.4 Large-Area Lakes with Restricted Circulation. - 4 Saline Lakes. - 4.1 Isotope Hydrology of Large Salt Lakes. - 4.2 Ephemeral Salt Lakes and Sabkhas. - 5 Isotopie Paleolimnology. - 6 Conclusions: From Lakes to Oceans. - References. - 6 Exchange of Chemicals Between the Atmosphere and Lakes / P. VLAHOS, D. MACKAY, S. J. EISENREICH, and KC. HORNBUCKLE. - 1 Introduction. - 2 Air-Water Partitioning Equilibria. - 3 Diffusion Between Water and Air. - 4 Volatilization and Absorption: Double-Resistance Approach. - 5 Factors Affecting Mass-Transfer Coefficients. - 6 Partitioning of Chemical to Paniculate Matter in Air and Water. - 6.1 Air. - 6.2 Water. - 7 Atmospheric Deposition Processes. - 7.1 Dry Deposition. - 7.2 Wet Deposition. - 8 Specimen Calculation. - 8.1 Step 1: Physicochemical Properties. - 8.2 Step 2: Mass-Transfer Coefficients. - 8.3 Step 3: Sorption in Air and Water. - 8.4 Step 4: Equilibrium Status. - 8.5 Step 5: Volatilization and Deposition Rates. - 9 Role of Air-Water Exchange in Lake Mass Balances. - 10 Case Studies. - 10.1 Mass Balance on Siskiwit Lake, Isle Royale. - 10.2 Mass Balance on Lake Superior. - 10.3 Air-Water Exchange in Green Bay, Lake Michigan. - 10.4 Air-Water Exchange in Lake Superior. - 11 Conclusions. - References. - 7 Atmospheric Depositions: Impact of Acids on Lakes / W. STUMM and J. SCHNOOR. - Abstract. - 1 Introduction: Anthropogenic Generation of Acidity. - 1.1 Genesis of Acid Precipitation. - 2 Acidity and Alkalinity: Neutralizing Capacities. - 2.1 Transfer of Acidity (or Alkalinity) from Pollution Through the Atmosphere to Ecosystems. - 3 Acidification of Aquatic and Terrestrial Ecosystems. - 3.1 Disturbance of H+ Balance from Temporal or Spatial Decoupling of the Production and Mineralization of the Biomass. - 3.2 In Situ H+ Ion Neutralization in Lakes. - 3.3 Krug and Frink Revisited. - 4 Brønsted Acids and Lewis Acids: Pollution by Heavy Metals, as Influenced by Acidity. - 4.1 Cycling of Metals. - 4.2 Pb in Soils. - 5 Impact of Acidity on Ecology in Watersheds. - 5.1 Soils. - 5.2 Lakes. - 5.3 Nitrogen Saturation of Forests. - 6 Critical Loads. - 6.1 Critical Load Maps. - 6.2 Models for Critical Load Evaluation. - 7 Case Studies. - 7.1 Chemical Weathering of Crystalline Rocks in the Catchment Area of Acidic Ticino Lakes, Switzerland. - 7.2 Watershed Manipulation Project at Bear Brooks, Maine. - 8 Summary. - References. - 8 Redox-Driven Cycling of Trace Elements in Lakes / J. HAMILTON-TAYLOR and W. DAVISON. - 1 Introduction. - 2 Major Biogeochemical Cycles and Pathways. - 3 Iron and Manganese. - 3.1 Transformations and Cycling. - 3.2 Iron and Manganese Compounds as Carrier Phases. - 4 Sediment-Water Interface. - 4.1 Diffusive Flux from Sediments. - 4.2 Evidence of Little or No Diffusive Efflux from Sediments. - 4.3 Transient Remobilization. - 4.4 Diffusive Flux into Sediments. - 5 Pathways Involving Redox Reactions Directly: Case Studies. - 5.1 Arsenic. - 5.2 Chromium. - 5.3 239,240Pu. - 5.4 Selenium 6 Pathways Involving Redox Reactions Indirectly: Case Studies. - 6.1 137Cs. - 6.2 Stable Pb, 210Pb, and 210Po. - 6.3 Zinc. - 7 Summary and Conclusions. - References. - 9 Comparative Geochemistry of Marine Saline Lakes / F. T. MACKENZIE, S. VINK, R. WOLLAST, and L. CHOU. - 1 Introduction. - 2 General Characteristics of Marine Saline Lakes. - 3 Comparative Sediment-Pore-Water Reactions. - 3.1 Mangrove Lake, Bermuda. - 3.2 Solar Lake, Sinai. - 4 Conclusions. - References. - 10 Organic Matter Accumulation Records in Lake Sediments / P. A. MEYERS and R. ISHIWATARI. - 1 Introduction. - 1.1 Significance of Organic Matter in Lake Sediments. - 1.2 Origins of Organic Matter to Lake Sediments. - 1.3 Alterations of Organic Matter During Deposition. - 1.4 Similarities and Differences Between Organic Matter in Sediments of Lakes and Oceans. - 1.5 Dating of Lake-Sediment Records. - 2 Indicators of Sources and Alterations of Total Organic Matter in Lake Sediments. - 2.1 Source Information Preserved in C/N Ratios of Sedimentary Organic Matter. - 2.2 Source Information from Carbon-Stable Isotopic Compositions. - 2.3 Source Information from Nitrogen-Stable Isotopic Compositions. - 3 Origin and Alterations of Humic Substances. - 4 Sources and Alterations of Lipid Biomarkers. - 4.1 Alteration of Lipids During Deposition. - 4.2 Changes in Sources vs Selective Diagenesis. - 4.3 Effects of Sediment Grain Size on Geolipid Compositions. - 4.4 Source Records of Alkanes in Lake Sediments. - 4.5 Preserv

Note: Contents Julian A. Dowdeswell and James D. Scourse: Preface --- Julian A. Dowdeswell and James D. Scourse: On the description and modelling of glacimarine sediments and sedimentation / Geological Society, London, Special Publications, 53:1-13, doi:10.1144/GSL.SP.1990.053.01.01 --- G. S. Boulton: Sedimentary and sea level changes during glacial cycles and their control on glacimarine facies architecture / Geological Society, London, Special Publications, 53:15-52, doi:10.1144/GSL.SP.1990.053.01.02 --- Ross D. Powell: Glacimarine processes at grounding-line fans and their growth to ice-contact deltas / Geological Society, London, Special Publications, 53:53-73, doi:10.1144/GSL.SP.1990.053.01.03 --- Ellen A. Cowan and Ross D. Powell: Suspended sediment transport and deposition of cyclically interlaminated sediment in a temperate glacial fjord, Alaska, U.S.A. / Geological Society, London, Special Publications, 53:75-89, doi:10.1144/GSL.SP.1990.053.01.04 --- Eugene W. Domack: Laminated terrigenous sediments from the Antarctic Peninsula: the role of subglacial and marine processes / Geological Society, London, Special Publications, 53:91-103, doi:10.1144/GSL.SP.1990.053.01.05 --- Robert Gilbert: Rafting in glacimarine environments / Geological Society, London, Special Publications, 53:105-120, doi:10.1144/GSL.SP.1990.053.01.06 --- Julian A. Dowdeswell and Tavi Murray: Modelling rates of sedimentation from icebergs / Geological Society, London, Special Publications, 53:121-137, doi:10.1144/GSL.SP.1990.053.01.07 --- Paul R. Carlson, Terry R. Bruns, and Michael A. Fisher: Development of slope valleys in the glacimarine environment of a complex subduction zone, Northern Gulf of Alaska / Geological Society, London, Special Publications, 53:139-153, doi:10.1144/GSL.SP.1990.053.01.08 --- Alec E. Aitken: Fossilization potential of Arctic fjord and continental shelf benthic macrofaunas / Geological Society, London, Special Publications, 53:155-176, doi:10.1144/GSL.SP.1990.053.01.09 --- James P. M. Syvitski, K. William G. LeBlanc, and R. E. Cranston: The flux and preservation of organic carbon in Baffin Island fjords / Geological Society, London, Special Publications, 53:177-199, doi:10.1144/GSL.SP.1990.053.01.10 --- Ian J. Fairchild and Baruch Spiro: Carbonate minerals in glacial sediments: geochemical clues to palaeoenvironment / Geological Society, London, Special Publications, 53:201-216, doi:10.1144/GSL.SP.1990.053.01.11 --- C. M. T. Woodworth-Lynas and J. Y. Guigné: Iceberg scours in the geological record: examples from glacial Lake Agassiz / Geological Society, London, Special Publications, 53:217-233, doi:10.1144/GSL.SP.1990.053.01.12 --- Jens Bischof, Joachim Koch, Michaela Kubisch, Robert F. Spielhagen, and Jörn Thiede: Nordic Seas surface ice drift reconstructions: evidence from ice rafted coal fragments during oxygen isotope stage 6 / Geological Society, London, Special Publications, 53:235-251, doi:10.1144/GSL.SP.1990.053.01.13 --- Anders Solheim, Lars Russwurm, Anders Elverhøi, and Mona Nyland Berg: Glacial geomorphic features in the northern Barents Sea: direct evidence for grounded ice and implications for the pattern of deglaciation and late glacial sedimentation / Geological Society, London, Special Publications, 53:253-268, doi:10.1144/GSL.SP.1990.053.01.14 --- Tore O. Vorren, Erland Lebesbye, and Kjell B. Larsen: Geometry and genesis of the glacigenic sediments in the southern Barents Sea / Geological Society, London, Special Publications, 53:269-288, doi:10.1144/GSL.SP.1990.053.01.15 --- D. Huddart and J. D. Peacock: Early Holocene morainal bank sedimentology and marine ecology, Skjoldungebrae gorge, North Scoresby Land, East Greenland / Geological Society, London, Special Publications, 53:289-305, doi:10.1144/GSL.SP.1990.053.01.16 --- Rodney L. Stevens: Proximal and distal glacimarine deposits in southwestern Sweden: contrasts in sedimentation / Geological Society, London, Special Publications, 53:307-316, doi:10.1144/GSL.SP.1990.053.01.17 --- A. R. Lord: The Pleistocene—Holocene transition in Southwestern Sweden and the recognition of deglaciation effects in adjacent seas / Geological Society, London, Special Publications, 53:317-328, doi:10.1144/GSL.SP.1990.053.01.18 --- J. D. Scourse, W. E. N. Austin, R. M. Bateman, J. A. Catt, C. D. R. Evans, J. E. Robinson, and J. R. Young: Sedimentology and micropalaeontology of glacimarine sediments from the Central and Southwestern Celtic Sea / Geological Society, London, Special Publications, 53:329-347, doi:10.1144/GSL.SP.1990.053.01.19 --- M. S. Stoker: Glacially-influenced sedimentation on the Hebridean slope, northwestern United Kingdom continental margin / Geological Society, London, Special Publications, 53:349-362, doi:10.1144/GSL.SP.1990.053.01.20 --- Carolyn H. Eyles and Martin B. Lagoe: Sedimentation patterns and facies geometries on a temperate glacially-influenced continental shelf: the Yakataga Formation, Middleton Island, Alaska / Geological Society, London, Special Publications, 53:363-386, doi:10.1144/GSL.SP.1990.053.01.21 --- A. C. M. Moncrieff and M. J. Hambrey: Marginal-marine glacial sedimentation in the late Precambrian succession of East Greenland / Geological Society, London, Special Publications, 53:387-410, doi:10.1144/GSL.SP.1990.053.01.22

Note: TABLE OF CONTENTS FOREWORD PREFACE LIST OF FIGURES LIST OF TABLES 1. NORTHERN HYDROLOGY: AN OVERVIEW 1.1. Introduction 1.2. Definition of "North" 1.2.1. Physical North 1.2.1.1. Polar Circles 1.2.1.2. Temperature 1.2.1.3. Snow/Ice Covers 1.2.1.4. Frozen Ground 1.2.1.5. Vegetation 1.2.1.6. Run-Off Direction 1.2.1.7. Composite Definition 1.2.1.8. Guideline Definition 1.3. Natural Landscape, Climate and Hydrology 1.3.1. General Landscape 1.3.2. Hydroclimatic Characteristics 1.3 .2.1. Precipitation/Snowcover 1.3.2.2. Drainage/Run-Off 1.3.2.3. Surface Storage 1.3.2.4. Permafrost 1.3.2.5. Ground Water 1.3.2.6. Evaporation/Evapotranspiration 1.3.2.7. Freshwater Ice Cover 1.3.2.8. Data-Collection Networks 1.4. Hydrological Classifications 1.4.1. Church (1974) Classification 1.4.1.1. Arctic-Nival 1.4.1.2. Subarctic-Nival 1.4.1.3. Proglacial 1.4.1.4. Muskeg 1.4.2. Network Classification 1.5. Development and Water Use 1.5.1. Historical Resource Development 1.5.2. Present Resources 1.5.2.1. Hydro-Power 1.5.2.2. Diversions 1.5.2.3. Mining 1.5.2.4. Oil and Gas 1.6. Evolving Issues 1.6.1. Northem Pollution 1.6.2. Global Change Effects 1.6.2.1. Precipitation/Snow/Glaciers 1.6.2.2. Floating Ice 1.6.2.3. Permafrost 1.6.2.4. Other 1.6.3. Monitoring Global Change 1.7. Reflections 2. SNOW HYDROLOGY 2.1. Introduction 2.1.1. Basic Processes 2.1.1.1. Atmospheric Processes 2.1.1.2. Snowcover Formation 2.1.1.3. Snowmelt Run-Off Processes 2.1.1.4. Snowcover Chemistry 2.1.2. Geographical Variations 2.1.2.1. Snowfall 2.1.2.2. Snowcover 2.1.2.3. Nival Streamflow Regimes 2.1.3. Relationship to Other Hydrological Variables 2.2. Historical Background 2.2.1. Snowfall 2.2.2. Snowcover Properties 2.2.3. Snowmelt Run-Off 2.3. Current Research 2.3.1. Blowing Snow 2.3.2. Meltwater Infiltration 2.3.3. Water Flux Through Cold Snowcovers 2.3.4. Remote Sensing 2.3.5. Snow Chemistry 2.3.6. Snow/Ground Interface Temperature 2.3.7. Snow Radiative Properties 2.4. Future Research Needs 2.4.1. Snowfall 2.4.2. Snowcover 2.4.3. Snowmelt 2.4.4. Snowmelt Run-Off 2.4.5. Removal of Solutes from Melting Snowcovers 3. PERMAFROST HYDROLOGY 3.1. Introduction 3.2. Historical Background 3.2.1. Streamflow Studies 3.2.2. Water-Balance Studies 3.2.3. Hillslope Hydrological Studies 3.2.4. Studies of Lake and Wetland Hydrology 3.3. Recent Trends 3.4. Current Research 3 .4.1. Coupling Snowmelt, Infiltration and Soil Moisture 3.4.2. Hydrological Modelling 3.5. Future Research Needs 3.5.1. Regional Hydrology 3.5.2. Climatic Change and Permafrost Hydrology 3.5.2.1. Application of Spatial Analogues 3.5.2.2. Application of Climatic Variability Analogues 3.5.2.3. Use of Simulation Models 4. GROUND-WATER HYDROLOGY 4.1. Introduction 4.1.1. Permafrost 4.1.2. Properties of Frozen Ground and Permafrost 4.1.2.1. Ice and Water Contents 4.1.2.2. Hydraulic Conductivity 4.1.3. Effects on Water Chemistry 4.1.3.1. Low Temperatures 4.1.3.2. Permafrost 4.2. Aquifers in Permafrost Areas 4.2.1. Position Relative to Permafrost 4.2.2. Suprapermafrost Aquifers 4.2.2.1. Subtype I Aquifers 4.2.2.2. Subtype II and III Aquifers 4.2.2.3. Chemical composition of suprapermafrost water 4.2.3. Intrapermafrost Aquifers 4.2.3.1. Open Taliks 4.2.3.2. Lateral Taliks 4.2.3.3. Isolated Taliks 4.2.3.4. Chemical Composition of Intrapermafrost Water 4.2.4. Subpermafrost Aquifers 4.2.4.1. Unconsolidated Deposits 4.2.4.2. Sedimentary Bedrock 4.2.4.3. Karst 4.2.4.4. Igneous and Metamorphic Terrain 4.2.4.5. Chemical Composition of Subpermafrost Water 4.3. Ground-Water Hydrology 4.3.1. Comparison with Non-Permafrost Areas 4.3.2. Infiltration and Ground-Water Recharge 4.3.3. Lateral Movement of Ground Water 4.3.4. Discharge of Ground Water 4.3.4.1. Springs 4.3.4.2. Base Flow 4.3.4.3. Icings 4.3.4.4. Ground-Water Discharge Rates from Icing Volumes 4.3.4.5. Chemical Composition of Icings and Meltwater 4.3.5. Importance of Ground Water 4.3.5.1. Fisheries 4.3.5.2. Vegetation 4.3.5.3. Water Supply 4.3.5.4. Recreation and Space Heating 4.4. Historical Background 4.4.1. Pre-1970 Situation 4.4.2. Recent Advances 4.4.3. Agencies Involved in Recent Research 4.4.4. Incentives for Recent Research 4.5. Current Research 4.6. Future Research Needs 4.6.1. Major Unknowns 4.6.2. Subjects Requiring Research 4.6.3. Future Incentives for Ground-Water Research 4.6.4. Major Impediments 5. HYDROLOGY OF FLOATING ICE 5.1. Introduction 5.2. Ice Processes on Rivers and Lakes: an Overview 5.3. Historical Background 5.3.1. Floods and High Stages 5.3.2. Low Flow 5.3.3. Flow Duration 5.3.4. Flow Measurement 5.4. Current Research 5.4.1. Ice Jams, Break-Up and Freeze-Up 5.4.2. Low Flows 5.4.3. Flow Duration 5.4.4. Flow Measurement 5.5. Future Research Needs 5.5.1. Ice Jams, Break-Up and Freeze-Up 5.5.2. Low Flows 5.5.3. Continuous Simulation 5.5.4. Flow Measurement 5.6. New Research Approaches 5.7. Conclusion 5.8. Acknowledgements 6. GLACIER HYDROLOGY 6.1. Introduction 6.2. Glacier Hydrology: an Overview 6.2.1. Run-Off 6.2.2. Local Variability in Climatic Inputs 6.2.3. Regional Variability 6.2.4. Temporal Variability in Climatic Inputs 6.2.5. Glacier Outburst Floods 6.2.6. Distribution and Characteristics of Canadian Glaciers 6.3. Process and Regional Examples 6.3.1. Typical Run-off Components from a Glacierized Catchment 6.3.2. Western Cordilleran Example - Peyto Glacier 6.3.3.1. Basin Description 6.3.3.2. Meteorological Inputs and Snow-Line Movement 6.3.3.3. Internal Hydrology of the Glacier 6.3.3.4. Specific Yield within the Basin 6.3.3.5. The Resultant Hydrographs 6.3.3.6. Detailed Interrelationship (1970/74) 6.3.4. High-Arctic Example - White Glacier 6.4. A History of Glacier Hydrology Studies 6.4.1. Studies in the Western Cordillera 6.4.2. The Arctic lslands 6.4.3. Studies in the Yukon 6.4.4. Studies in Labrador 6.4.5. The International Hydrological Decade 6.4.6. International Hydrological Programme 6.5. The Main Achievements of Hydrology Studies in Glacierized Basins 6.5.1. Basic Description of Resources 6.5.2. Achievements in Glacier Mass Balance 6.5.3. Achievements in Glacier-Run-Off Studies 6.5.3.1. Meltwater Generation 6.5.3.2. Glacier Outburst Floods 6.5.3.3. Models of Basin Run-Off 6.5.4. Achievements in Surveying and Remote Sensing 6.6. The Future 7. WATER-QUALITY RESEARCH 7.1. Introduction 7 .2. Historical Background 7.2.1. Activities Prior to 1969 7.2.2. Overview ofN.W.T. Water-Quality Network Data 7.2.3. Mackenzie River Basin 7.2.4. Yukon River Basin 7.2.5. Limnological Research Activities near Resolute, Cornwallis Island and at Saqvaqjuac 7.3. Current Research - Long-Range Atmospheric Transport and Deposition 7.4. Future Research Needs 7.5. Acknowledgements 8. THE REGIONAL ENERGY BALANCE 8.1. Introduction 8.1.1. Basic Processes 8.1.2. Regional Variations 8.1.3. Relationship to Other Hydrological Variables 8.1.4. Importance to the Northern Environment 8.2. Historical Background 8.2.1. Subarctic 8.2.2. Arctic Tundra 8.2.3. Glacierized Basins 8.3. Current Research 8.4. Future Research Needs 9. REGIONAL HYDROLOGY 9.1. Introduction 9.2. Hydrological Regions 9.2.1. Shawinigan Engineering Studies 9.2.2 Acres Consulting Services Ltd 9 .2.2.1. Annual Yield 9.2.2.2. Low Flow 9.2.2.3. Floods 9.2.3. Joint DOE-DIAND Studies 9.2.4. 1985-86 IWD Network Evaluation in Western and Northern Region 9.2.5 The Maekenzie River Basin Flow Model 9.3. River Elements in the Northern Hydrological Cycle 9.3.1. Snowfall Components 9.3.2. Ice Proeesses and Northem Streamflow 9.3.2.1. The Freeze-Up 9.3.2.2. Midwinter Flows 9.3.2.3. Streamflow in the Annual Break-Up 9.4. Northern Streamflow Data Collection 9.5. Conclusions 10. WATER MANAGEMENT NORTH OF 60° 10.1. lntroduction 10.2. Legislative Framework 10.3. Water Boards 10.4. Licensing and Authorization 10.4.1. Lieensing 10.4.2. Authorization 10.5. Enforcement 10.6. Data Collection 10.6.1. Water Quantity 10.6.2. Water Quality 10.6.3. Preeipitation 10.7. Planning 10.7.1. Comprehensive Planning 10.7.2. Integrated Planning 10.8. Major Ma