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Why do some rivers Flood?Factors making a ‘flashy’ hydrograph
‘Flashy’ and ‘Flat’ Hydrographs
Precipitation intensityTorrential Rain And so? And so ? Precipitation intensity
Precipitation intensityTorrential Rain Ground can’t absorb it fast enough – overland flow Flash Flood Precipitation intensity
Factor 1 – Precipitation intensitySteady Rain And so? And so ? Factor 1 – Precipitation intensity
Factor 1 – Precipitation typesnowfall And so? And so ? snowfall And so? And so ? Factor 1 – Precipitation type
Types of Underlying RockGranite is impermeable And so Types of Underlying Rock
Types of Underlying Rockchalk and most limestones re permeable And so Types of Underlying Rock
Sand is permeable but clay is impermeableAnd so Soils
Soils – saturated / frozenSand and clay if saturated or frozen are impermeable And so Soils – saturated / frozen
Forest much interceptionAnd so Forested
Deforested no interceptionAnd so Deforested
Covers ground in impermeable materialsAnd so Urbanisation
Installs storm drains And so Urbanisation
RIVER DRAINAGE BASINS.
Factors affecting the movement of water through a Drainage Basin
The passage of water through the Drainage Basin
Pick a Number to Reveal the Picture! Continue..
Analysis of Hydrographs
The Flood hydrograph A brief explanation-
Another Important Abiotic Factor
Factors that affect flood risk…
Account for the pattern shown on the storm hydrograph. 8 marks Connection between rainfall and mean daily flow. Connection between rainfall and mean daily.
If water can pass through a surface, the surface is permeable.
The Water Cycle Water is recycled through the water cycle.
WJEC (B) GCSE Geography Theme 2 Topic 2 Click to continue Hodder Education Revision Lessons Understanding hydrographs.
Precipitation Interception Throughfall Stemflow Evaporation Transpiration Evaporation Ocean Lake Ground water Overland flow Return flow Infiltration Redistribution.
Chapter 9: Water Moving Underground More than 97 percent of all water on Earth is in the ocean as salt water. Glaciers – of the little amount of fresh.
Active Reading Workbook pg Turn in. Then open book to page 290.
River 3- Storm Hydrographs
Unit 4 Climate Part 2 Factors affecting water movement.
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