About pH:The indicator for acidity or alkalinity is known as the pH value. A pH value of 7 means a substance is neutral. A lower value indicates acidity, and a higher value is a sign of alkalinity. For example, a lemon has a pH of 2.5 while soapy water has a pH of 10.

pH and Water | So, what does pH mean for water? (Source: http://www.ncsu.edu/sciencejunction/)

• 3.5 and below | Unlikely that fish can survive for more than a few hours in this range.
• 3.5-4.0 | Known to be lethal to all salmonids4.0-4.5 | All fish, most frogs and insects are not present.
• 4.5-5.0 | Mayfly and many other insect species are not found. Most fish eggs will not hatch.
• 5.0-5.5 | Bottom-dwelling decomposing bacteria begin to die off. Organic materials accumulate. Plankton begin to disappear.
• 6.0-6.5 | Freshwater shrimp are not present.
• 6.5-8.5 | Optimal for most organisms.
• 8.5-9.0 | Unlikely to be harmful to fish, but indirect effects from chemical changes in the water may occur.
• 9.0-10.5 | Harmful to perch and salmonids if prolonged exposure.
• 10.5-11.0 | Prolonged exposure is lethal to carp and perch.
• 11.0 or above | Lethal to all species of fish.

About the image transformation: Here I am experimenting with copying portions of the bitmaps of both living bodies of water and human bodies into the main image. If the DO readings are high then the slice of image that is copied is wider thus larger (streams with more DO can support larger life forms). As the flow increases and decreases these slices of various images are copied cyclically from left to right (as flow increases) and from right to left (as flow decreases). As temperature increases, the opacity increases of the bitmaps being copied into the main image. However, if the temperature is too high to support life, only red bitmaps are copied. If the pH is too high or too low to sustain life, black bitmaps are copied into the bitmap.