1. USGS scientists stunning fish with an electrical shock to identify and count species, and measure length and weight. Fish are returned to the stream after they have been identified and measured.
1. USGS scientists stunning fish with an electrical shock
to identify and count species, and measure length and weight. Fish are returned to the stream after they have been identified and measured.
2. Fish being identified, sorted, and put in containers
to be measured and weighed before they are returned to the stream.
3. USGS scientists processing fish for tissue-sample
analysis.
4. USGS scientist is measuring various water-quality
conditions in Holes Creek at
5. USGS scientists identifying and separating
macroinvertebrates collected in a stream.
These organisms are used to determine stream health.
6. USGS scientist collecting rocks covered by algae.
Algae are very sensitive to water chemistry and habitat disturbance, and
they have a long history of being used in water-quality
monitoring.
7. Nuisance algal growth, Rhizoclonium
sp. algae, shown here from the Mad River was visible in many study-unit streams.
8. Stream-habitat
characteristics in an urban area (top) and a highly agricultural basin
(bottom) in the Great and Little Miami River Basins.
Compared to the highly modified and unprotected stream channels in
agricultural areas, channels in established urban areas generally fared
better in terms of stream habitat
9. Drilling of a shallow monitoring well.
Such wells were drilled and installed in urban and agricultural areas
to determine water-quality differences in ground water underlying various
land uses.
10. USGS scientist measuring water level in monitoring well drilled in an urban area.
11. USGS sampling setup used to collect water samples
from shallow monitoring wells installed in urban and agricultural areas.
12. USGS scientist holding an electronic probe used to
measure water temperature, dissolved oxygen, pH, and specific conductance in
ground water prior to collecting sampling.
13. USGS scientist collecting sample in an enclosed
plastic chamber to prevent contamination from outside sources.
14. USGS scientist using special equipment to collect a
water sample that will be analyzed for Radon.
15. Typical straight drainage ditch in an agricultural
area, in Darke County, Ohio
16. Agricultural tiles draining into Painter Creek in Miami County, Ohio
U.S. Department of the Interior, U.S. Geological Survey
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Last update: May, 2004