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Why do some rivers Flood? Factors making a flashy hydrograph
Flashy and Flat Hydrographs
Precipitation intensity Torrential Rain And so?
Precipitation intensity Torrential Rain Ground cant absorb it fast enough – overland flow Flash Flood
Steady Rain And so? Factor 1 – Precipitation intensity
snowfall And so? Factor 1 – Precipitation type snowfall And so?
Types of Underlying Rock Granite is impermeable And so
Types of Underlying Rock chalk and most limestones re permeable And so
Soils Sand is permeable but clay is impermeable And so
Soils – saturated / frozen Sand and clay if saturated or frozen are impermeable And so
Forested Forest much interception And so
Deforested Deforested no interception And so
Urbanisation Covers ground in impermeable materials And so
Urbanisation Installs storm drains And so
Construction And Analysis of Hydrographs ©Microsoft Word clipart Ollie Bray – Knox Academy, East Lothian.
Natural & Human. The hydrograph – a reminder! Key Fact: Shorter Lag Time + Steeper Rising Limb = Increased Flood Risk.
The passage of water through the Drainage Basin. The Drainage Basin System:
Water, Another Important Abiotic Factor (just like soil)
The Flood hydrograph A brief explanation- By Paul P., Dean M., George W., James S., Chris O.
Factors affecting the movement of water through a Drainage Basin INPUTS and OUTPUTS as shown by the WATER BEDGET Physical FactorsSOIL GEOLOGY VEGETATION.
Who Wants To Be A Millionaire? Rocks and Soils Question 1.
RIVER DRAINAGE BASINS. A RIVER SYSTEM ACTS LIKE A SYSTEM OF DOWNPIPES AND GUTTERING ON A HOUSE - IT ALLOWS THE MOVEMENT OF RAINWATER INTO THE SEA.
Surface Water & Ground Water Karen Lopez & Jennifer Lopez(:
Pick a Number to Reveal the Picture! Continue..
The Water Cycle this is where it all begins. Infiltration ( also called percolation ) only happens when the ground is permeable PermeableImpermeable water.
Soil Forming Factors Biotic and Abiotic factors that control soil development.
Account for the pattern shown on the storm hydrograph. 8 marks Connection between rainfall and mean daily flow. Connection between rainfall and mean daily.
Soil The product of weathering of rocks Soil is made from rocks, minerals (mainly sand and clay), and organic material. Soil forms layers of different.
QPA Review for 3 rd 9 Weeks. Ch.10 Fresh Water 1. What percent of Earth’s water is salty? What percent is fresh?
The Water Cycle. Processes in the Water Cycle The water cycle is made up of 5 processes The water cycle is made up of 5 processes –Evaporation/transpiration-
D ISTRIBUTION OF W ATER ON E ARTH. T HE H YDROSPHERE Hydrosphere: the part of Earth that contains water 97% of Earth’s water is salt water Only 3% is.
The Water Cycle In this presentation you will: explore the stages of the water cycle ClassAct SRS enabled.
Soil Portfolio By Tim Butterfield. What is soil? Soil is the medium in which crops are grown to feed human and other living things. It is also is a loose.
Who Wants To Be A Millionaire? Year 3 Rocks and Soils.
What are the characteristics of rocks? The types of rocks are : Igneous -Igneous rocks are formed from melted rock that has cooled and solidified rocks.
Hazards Atmospheric Tectonic Oceanic. One of the most hazardous races known to man…the French.
FLASH FLOODS By Swetha Vontela. Rules - when caught in flood Get to higher ground immediately Never cross running flood water Be especially careful at.
What causes Flooding? You know what a flood is …. ??? Dont you?? Well, can you identify three ways a flood can be caused??
The streams found in mountains are likely to have formed relatively recently.
When it Rains it Pours Todays Goal: To understand how water is absorbed into the ground. To be able to explain the difference between pervious and impervious.
Chapter 9, Section 2. Groundwater Water that collects in the pores and empty spaces of soil and rocks. Estimated that 14% of freshwater is groundwater.
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