The amount of water that can infiltrate into the soil is influenced by precipitation
factors and the nature of the soil. The precipitation factors are type of precipitation,
amount, duration and intensity of precipitation. The soil characteristics most
important to infiltration are porosity, permeability and texture of the soil.
2 litre plastic bottle with top cut off
Paper coffee filter
Measuring cup or graduated cylinder
For magic geoforms:
Set up bottle as shown
Place coffee filter in funnel
Fill coffee filter with dry soil
Make sure soil sample is spread evenly
Pour ml of water slowly over soil do not let overflow
Record time it takes for water to be absorbed into soil and begin to drain into bottle
Use measuring cup to determine amount of water that drained through soil and record
Record amount of water retained in soil
Compare your results with another soil sample.
In which soil did the water drain begin to drain most quickly?
Which soil absorbed the most water?
Which soil absorbed the least water?
Which soil would be most helpful in preventing floods? Why?
Which soil would be least helpful in preventing floods? Why?
Printed with permission from Michal L. Le Vasseur, 2001
Infiltration (Adobe PDF document)
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