Sample KNK Board

Know Need to Know
Dead trout and other fish were found floating at the base of the Snake River Dam five miles upstream from the Riverwood water intake.

Preliminary tests revealed no evidence of toxic substances.

The towm council voted to shut down the water plant for three days.

Further analysis of the fish revealed signs of biological trauma, including hemorraging and small bubbles under the skin along the lateral line.

Suspended particles were rules out as a couse of the kill.












If the cause of the fish ksll was water-related, could it be due to something supsended or dissolved in water?

What types of substances can be dissolved or suspended in water?

Which ones are potentially harmful to aquatic life?

What is the cause of the Riverwood emergency?

What are possible emission sources upstream from the dam?

What happens to water as it goes over the dam?

Do any additional substances become dissolved in it?

What is the nature of the bubbles found in the fish?

What substances might harm fish but not humans?

Could the fish have died from a deficiency or overdose of a natually occurring and necessaray substance?

How do we know how pure a sample of water really is? (presence of contaminants that cannot be detected with the unaided senses?)

How much water do we really use?

Where is the earth's water?

Where does our water come from?

From Supplying Our Water Needs, a HELP project by Gary Fryrear, Bill Meder and Shelly Peretz.