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© Boardworks Ltd 2001 In pairs discuss what this diagram shows.

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Presentation on theme: "© Boardworks Ltd 2001 In pairs discuss what this diagram shows."— Presentation transcript:

1 © Boardworks Ltd 2001 In pairs discuss what this diagram shows

2 The Drainage Basin System

3 © Boardworks Ltd 2001 Objectives A*- Identify drainage basin factors from an OS map and explain how they affect inputs, outputs and increase/reduce transfers. A- Identify drainage basin factors from an OS map and explain how they affect inputs, outputs and transfers. B- Identify drainage basin factors from an OS map and suggest how they affect inputs, outputs or transfers.

4

5 The Drainage Basin

6 river evapotranspiration precipitation throughflow surface runoff groundwater flow water table interception percolation infiltration

7 Drainage Basin System Sorting task inputs stores and flows outputs precipitation interception surface runoff surface water storage soil water storage groundwater storage infiltration river runoff evaporation transpiration groundwater flow throughflow percolation

8 Drainage Basin System inputsstores and flowsoutputs precipitationinterception surface runoff surface water storage soil water storage groundwater storage infiltration river runoff evaporation transpiration groundwater flow throughflow percolation

9 Match the drainage basin terms to the correct definitions! Water seeps into the ground Water flows horizontally through the soil into the river Water flows horizontally over the land into the river Water flows vertically through the soil and rocks Water turns from water droplets into water vapour Water vapour is released through the stomata (pores) in the leaves Water flows horizontally through the rock into the river Water is stored on leaves and branches of vegetation interception surface runoff infiltration evaporation transpiration groundwater flow throughflow percolation Water is stored on leaves and branches of vegetation Water flows horizontally over the land into the river Water flows horizontally through the rock into the river Water turns from water droplets into water vapour Water seeps into the ground Water flows horizontally through the soil into the river Water vapour is released through the stomata (pores) in the leaves Water flows vertically through the soil and rocks

10 Match the drainage basin terms to the correct definitions! Water seeps into the ground Water flows horizontally through the soil into the river Water flows horizontally over the land into the river Water flows vertically through the soil and rocks Water turns from water droplets into water vapour Water vapour is released through the stomata (pores) in the leaves Water flows horizontally through the rock into the river Water is stored on leaves and branches of vegetation interception surface runoff infiltration evaporation transpiration groundwater flow throughflow percolation Water is stored on leaves and branches of vegetation Water flows horizontally over the land into the river Water flows horizontally through the rock into the river Water turns from water droplets into water vapour Water seeps into the ground Water flows horizontally through the soil into the river Water vapour is released through the stomata (pores) in the leaves Water flows vertically through the soil and rocks

11 Drainage Density (number of streams): the more the streams the more the river run off

12 Relief: the steeper the slope the more surface run off

13 Soil: the deeper the soil the more the infiltration

14 Natural Vegetation: the more the vegetation, the greater the interception ForestMoor land

15 Land Use: the more urban, the more the surface run off. The more rural, the more ground water storage

16 The OS map task: On the map extract of Penrith, find the Drainage Basins comprised between grid squares: 4520 to 4820 (bottom) and 4523 to 4823 (top) Prepare a short presentation of where your group identify a range of factors (stream density, relief, soil, vegetation, land use etc....) and explain how they affect inputs, outputs and flows. Remember you must use map evidence to support your points: 6 figure grid references Contour lines with commnent on gradient (steep or gentle) Map symbols Scale (how long is a feature on the map in metres or km)

17 Trees reduce how much water reaches the channel? trees intercept the rain evapotranspiration reduces the amount of water that reaches the river water is taken through the roots and so less enters the river


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