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Ms. Chin's Class: Experiment Page
Does Vegetation Help Prevent Runoff?
Purpose: To find out how much vegetation is needed to help prevent runoff.
Hypothesis: Vegetation absorbs the water and helps prevent runoff.
Experimental Design:
- Get six trays
- Tray one has no sponges
- Cover the bottom 1/4 of tray two with sponges
- Cover the bottom 1/2 of tray three with sponges
- Cover the bottom 3/4 of tray four with sponges
- Cover the bottom 7/8 of tray five with sponges
- Cover the entire bottom of tray six with sponges
- Pour dirt into all the trays
- Pour water into all the trays until the dirt gets wet enough to make "mud-pies"
- Observe and record the changes of all six trays absorbing the water
Observation:
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Tray
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Number
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Amount of Vegetation Amount of Runoff (fraction of a gallon)
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1
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None
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1/4
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2
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1/4
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5/16
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3
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1/2
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3/8
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4
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3/4
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5/16
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5
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7/8
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7/16
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6
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4/4 (All)
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1/2
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Conclusion: The hypothesis was correct because Tray 6 had the entire bottom covered with sponges (vegetation). It did soak more water than the other trays.
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