This map allows you to view all attribute ratings that were used for the 2016 EDT Model Analyses. By using the time slider, you can view how the monthly pattern changes for attributes with a temporal component.
Additional layers such as obstructions, land use, and spawning origins have been
included and can be turned on using the control panel on the right.
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Alkalinity, or acid neutralizing capacity (ANC), is measured as milli-equivalents per liter or mg/l of either HCO3 or CaCO3. Alkalinity is broadly correlated with the productive capacity of streams, with respect to both primary production and fish production (Ptolemy 1993). Hard waters apparently tend to be more productive, though reasons for this have not been clearly established (Hynes 1972).
Alkalinity is used in EDT as a measure of stream productivity and in turn, affects 1) the maximum density that can be attained by the end of rearing life stages and 2) resulting species productivity.
Categorical Rating Definitions
0: Very low (average value typically would be 0-5 mg/l)
1: Moderately low (average value typically would be 5-10 mg/l)
2: Moderately high (average value typically would be 10-40 mg/l)
3: High (average value typically would be 40-100 mg/l)
4: High (average value typically would be 100-300 mg/l)
|Natural Chennel Confinement||0.69|
|Artificial Channel Confinement||0.54|
|Flow Peack Change||0.53|