Water Assessment Data Lab
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Transcript of Water Assessment Data Lab
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Water Assessment Data Lab
Assignment # 5
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Land Use
• The first thing you notice when field sampling is the area around your site. What type of land use is going on around it? What condition is it in?
• www.maps.google.com• Which stream do you think is going
to be severely impacted and which will be non- impacted?
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The Data Sheets
• Data courtesy of Watershed Assessment Associates
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Physical Characteristics
• Width, Depth, Current- affect who lives there
• Substrate- particle size of the stream bottom
• Embeddedness- How deeply the rocks are pushed into the stream bed
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Chemical Measurements
• Temp• Conductance- Indicates salts and
ions• DO and %DO-• pH• Salinity
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Biological Attributes
• Canopy• Aquatic Vegetation• Macroinvertebrates • Faunal conditions• Observations- What other things
might you want to note from your sample site?
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Invert counts
• This is what we are going to do for the final lab!
• Genera Richness- Why would this be important?
• EPT- Ephemeroptera, Plecoptera, and Trichoptera (who are highly sensitive to pollution)
EPT= {(E+P+T)/ Total bugs}*100%
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EPT= {(E+P+T)/ Total bugs}*100%
{(11+0+78)/100}*100%= 79%
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SENSITIVE__B__ Caddisflies (except net spinners)__A__ Mayflies_____ Stoneflies_____ Water snipe flies__A__ Riffle beetles__A__ Water pennies_____ Gilled snails
LESS SENSITIVE_____ Dobsonflies_____ Fishflies_____ Common
net spinningCaddisflies
_____ Crane flies_____ Damselflies_____ Dragonflies_____ Alderflies_____ Crayfish_____ Scuds_____ sowbugs_____ Clams_____ Mussels
TOLERANT_____ Aquatic worms_____ Black flies__A__ Midge flies_____ Leeches_____ Lunged snails
__4__ # of letters multiplied by 3 =__12___
____ # of letters multiplied by 2 =_____
__1__ # of letters multiplied by 1 =__1___
Now add the three totals from each column for your stream’s index value. Total index value = ____13______
Water Quality Rating_____ Excellent ( > 22) _____ Good (17-22) __X___ Fair (11-16) _____ Poor ( < 11)
Use letter codes (A = 1-9, B = 10-99,C = 100 or more) to record the numbers of organisms.
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How's the water?
• Put it all together! • Do you think this stream is Severely
impacted, somewhat impacted or non-impacted?
• Now try it on your own with the next 2 and use the questions to walk you through the analysis.
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