Transcript of "Explaining floods with hydrographs"
Explaining Floods with River Hydrographs
The Drainage Basin SystemQ1. Make your own version of this diagram in your notebook under the title ‘The Drainage Basin System’. Make sure to leave lots of space for annotations around the sides of the diagram
Q2. In your notes copy the table below and then place each of the listedterms/phrases into the appropriate part of the table: Inputs Stores Transfers Outputs Factors influencing movement of water through the systemInfiltration, percolation, water table/ground water, interception,evapotranspiration, gradient, rock permeability, vegetation, channelflow, ground water flow, surface storage e.g. lakes, precipitation,intensity of precipitation, duration of precipitationQ3. Annotate your diagram (from activity 1) with the terms in the tableabove to demonstrate how water moves through the system:
Physical factors influencing river discharge and floodingQ4.Two people in your group are going to create a list of physicalcharacteristics of drainage basins that will lead to maximum floodingpotentialTwo people in your group are going to create a list of physicalcharacteristics of drainage basins that will lead to minimum floodingpotentialDrainage Basin Very Likely to Flood Drainage Basin very Unlikely to Flood
Human factors affecting river discharge and Q5. In your groups,flooding use this sketch and your own drainage basin diagrams as a stimulus to create a list of as many reasons why Metro Manila experiences worse floods in 2012 than Manila did in 1912 as possible. Think of political, demographic, social, economic and environmental reasons.
Q6. In your groups discuss what the creator of this cartoon is trying tosay about the reasons why Metro Manila experiences such bad floodproblems? Try to create a detailed answer.
The graph below is a river hydrograph. It shows how river discharge (thevolume of water flowing in the river) is influenced by precipitation. Thegraph shows 2 rivers (A and B). Q7. Using the Level at which River discharge table that you river floods created in activity 2 to help you, create a list Rainfall of factors you think could explain the differences between the way rivers A and B respond to precipitation?
Q8. In your notes explain which river is more likely to cause floods
Q9. Write 2 summary paragraphs explaining:a) The reasons why floods happenb) How river hydrographs are used
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