Geology Which one might be permeable? Which one would slow down the passage of water the most? Which one would be most likely to flood?
Deforestation – how would this affect movement of water through the system?
Vegetation What processes are shown? How does vegetation affect infiltration? How does vegetation affect the speed of passage of water through the drainage basin? How does vegetation affect the hydrograph shape? A or B?
URBANISATION – removing vegetation and increasing RUN OFF
Industry Can also discharge water Effect on hydrograph? Effect on water quality? Effect on sediment?
TASKS <ul><li>Create a flood hydrograph from the data for River Thaw </li></ul><ul><li>http://www.ngfl-cymru.org.uk/vtc/ngfl/2007-08/geog/hydrology/Flood%20Hydrographs/Activity%203%20-%20Flood%20Hydrograph,%20River%20Thaw.html </li></ul><ul><li>Follow the link above to see what the graph should look like </li></ul><ul><li>Explain the shape of the graph – how is rainfall linked to discharge. </li></ul>
Extra Links <ul><li>http://www.geogonline.org.uk/as_drainage.htm </li></ul><ul><li>http://www.ngfl-cymru.org.uk/vtc/ngfl/2007-08/geog/hydrology/front_%20pages/index_floodhydrograph.html </li></ul>