According to the Hilsenhoff Biotic Index,
the water quality in both these sites is very, very poor!
Wait a minute—what index is this?
The Hilsenhoff Biotic Index, or HBI, measures the health of a stream on
a scale from 1 to 10. A value of 1 suggests the presence of a macroinvertebrate
community that is very sensitive to pollution, meaning that the water
quality is excellent. A value of 10 suggests the opposite. Let me have
a look at your data, Ms. DeRama.
I’m shocked, absolutely shocked that such a polluted stream is flowing
unchecked through Yellowstone National Park! It’s enough to make