© Boardworks Ltd 2001

In pairs discuss what this diagram shows

The Drainage Basin System

© Boardworks Ltd 2001

ObjectivesA*- 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.

The Drainage Basin

The Drainage Basin

river

evapotranspiration

precipitation

throughflow

surface runoff

groundwater flowwater table

interception

percolation

infiltration

Drainage Basin System

Sorting taskinputs stores and flows outputs

precipitation

interception

surface runoff

surface water storagesoil water storage

groundwater storage

infiltration

river runoff evaporationtranspiration

groundwater flow

throughflow

percolation

Drainage Basin System

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

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

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

Drainage Density (number of streams): the more the streams the more the river

run off

Relief: the steeper the slope the more surface run off

Soil: the deeper the soil the more the infiltration

Natural Vegetation: the more the vegetation, the greater the

interceptionForest Moor land

Land Use: the more urban, the more the surface run off.

The more rural, the more ground water storage

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 referencesContour lines with commnent on gradient (steep or gentle)Map symbolsScale (how long is a feature on the map in metres or km)

Trees reduce how much water reaches thechannel?

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