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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
1 HYDROSPHERE1 INTRODUCTION This unit has three components, The Hydrological cycle and its features. Working with hydrographs and Studying rivers.
Flood hydrographsHydrosphere. Flood hydrographs show the effect that precipitation has on the water levels in a river. After a storm the water levels.
A RIVER SYSTEM ACTS LIKE A SYSTEM OF DOWNPIPES AND GUTTERING ON A HOUSE - IT ALLOWS THE MOVEMENT OF RAINWATER INTO THE SEA.
River Hydrographs Why do we use hydrographs?
Construction And Analysis Of Hydrographs. Hydrograph Record of River Discharge over a period of time River Discharge = cross sectional area rivers mean.
FLOOD HYDROGRAPHS FOR GCSE GEOGRAPHY.
River 3- Storm Hydrographs
River Processes and Pressures What are Hydrographs?
Construction And Analysis of Hydrographs ©Microsoft Word clipart Ballakermeen High School.
THE CAUSES OF FLOODING Moo!. Causes of flooding memory game- 1 minute to remember Heavy rain rainfall Snow melt Antecedent rainfall (it has rained before.
The Flood hydrograph A brief explanation-
Construction And Analysis Of Hydrographs Hours from start of rain storm Discharge (m 3 /s) Base flow Through flow Overland.
Factors that affect flood risk…
Construction And Analysis of Hydrographs ©Microsoft Word clipart.
Analysis of Hydrographs
If water can pass through a surface, the surface is permeable.
Groundwater Water found underground in the cracks and spaces in soil, sand and rock. Question: How does water collect underground? Use the terms permeable.
1. Throughflow 2. Channel Flow 3. Surface Runoff 4. Soil Moisture 5. Groundwater a) Water stored in the rocks below ground b) Water moving downhill within.
Nicolson Institute - Geography Department The objectives of this PowerPoint presentation and the accompanying work sheet are to - introduce storm hydrographs.
The passage of water through the Drainage Basin
Storm Hydrographs Yr12IB Drainage Basins.
Ground Water Notes. I like science. Water Table The spaces between the grains are filled with air. The spaces between the grains are filled with water.
The Storm Hydrograph Specification Focus: Factors affecting discharge: the storm hydrograph. Bar and line graphs Learning Outcomes: recognise the regimes.
WJEC (B) GCSE Geography Theme 2 Topic 2 Click to continue Hodder Education Revision Lessons Understanding hydrographs.
How does water underground reach the surface? Freshwater flows underground.
Construction Analysis Hydrographs
Chapter 11 section 1 Water. Water Resources Water is essential to life on Earth. Humans can live for more than month without food, but we can live for.
Storm Hydrographs A hydrograph shows the discharge of a river at a given point over a period of time. The hydrograph is used to show how a particular river.
HYDROGRAPHS: CONSTRUCTION AND ANALYSIS 01/10/2016.
The Water Cycle Water is recycled through the water cycle.
Learning Objectives: To list and explain the causes of flooding by referring to the storm hydrograph and the water budge. What are floods and what causes.
THIS IS With Host... Your Vocabulary Streams & Rivers (2-1) Wetland Environments (2-3) Water Underground (2-5) Groundwater Diagrams.
Unit 4 Climate Part 2 Factors affecting water movement.
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.
Run Off Water. Run off water is a result of water not being able to be absorbed by the surface of the ground. Gravity pulls the run off water along the.
Water Resources Environmental Science Spring 2011.
HYDROSPHERE By the end of the lesson you will be able to: 1.Describe the global hydrological cycle 2.Categorise the elements of the movement of water within.
THE WATER CYCLE EVAPORATION CONDENSATION PRECIPITATION SURFACE RUNOFF INFILTRATION TRANSPIRATION Rain, Snow, Sleet, Hail Water vapor turning to liquid.
Water Underground Chapter 11 section 3. How does water move underground? Like surface water, underground water generally comes from precipitation. Water.
The Structure of the Hydrosphere
Why doesn’t rainwater always infiltrate into the ground? Water soaking into the ground is…
RIVER DRAINAGE BASINS.
Active Reading Workbook pg Turn in. Then open book to page 290.
HYDROLOGICAL CYCLE Freshwater Issues and Conflicts.
Chapter 2 Fresh Water Section 5 Water Underground
NATURAL HAZARDS AND PEOPLE
Factors affecting the movement of water through a Drainage Basin
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