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Lecture 19

ENVIRSC 1G03 Lecture Notes - Lecture 19: Total Dissolved Solids, Electrical Resistivity And Conductivity, Oxbow Lake


Department
Environmental Science
Course Code
ENVIRSC 1G03
Professor
Maureen Padden
Lecture
19

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ENVIRSC / EARTHSC 1G03
Dr. Padden
Oct. 28, 2016
Lecture 19: Steams II & McMarsh Field Lab
McMarsh Field Lab
Recall: Discharge is the amount of water that passes a point at a given time.
o Discharge Q = w x d x velocity
o m x m x m/s = m3/s
o When measuring, there will always be some degree of uncertainty
This can be somewhat remedied using integration (divide parts of
the stream into smaller and smaller sections)
Measuring Stream Velocity
o Fastest stream velocity will be in the middle of the stream, down a bit from
the top
Least friction from bottom and sides of the river
o Tips to keep in mind:
Point the sensor upstream
Keep the electronics (orange bag) out of the water
Units: m/s
Stream Chemistry
o Measures:
Temperature
Electrical conductivity
Important because it indicates what is dissolved in the water
Converts conductivity to:
o Total dissolved solids (TDS)
Fertilizer runoff (P, K, N)
Healthiest stream has smallest amount of
nutrients
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