Exposure Index Methods and Explanation of Summary Table Fields: SacPAS Central Valley Prediction and Assessment of Salmon and other fishes

Exposure Index Methods and Explanation of Summary Table Fields

Exposure graphs and summary tables are based on observed data retrieved from the SacPAS database. Summary tables include statistics for the total date period.

Result Summary Table Fields
Query Parameters
Year	Year as specified in the query.
Location	Location as specified in the query.
River Parameter	River Parameter as specified in the query.
Threshold Value	Threshold Value as specified in the query.
Calculate Exposure	Below Threshold Value: Calculate the percent of days exposed to values below the selected Threshold Value for the selected River Parameter. Above Threshold Value: Calculate the percent of days exposed to values above the selected Threshold Value for the selected River Parameter.
Fill Missing River Data	Yes: Apply simple data interpolation to fill missing data points within the River Parameter dataset. These filled values will be used in calculations for day exposure and averages. No: Use only River Parameter dataset as found in SacPAS.
Observation Period	The Observation Period is defined by the selected Start and End dates and selected Span Calendar Year option. The values specified in the query determine the maximum length of the observation period. Maximum possible length is two calendar years.
Total Number of Days Analyzed	Total number of days during the requested period when observed River Parameter conditions exist at the Location. If River Parameter data is unavailable/missing for any day during the Observation Period, then the days analyzed is less than the number of days possible in the Observation Period.
Average for All Days Analyzed	Average observed condition values during the requested period at the Location. Sum of daily average observed values divided by the Total Number of Days Analyzed.
Average of Threshold Condition Days	Average observed condition values for the days during the requested period when observed River Parameter conditions matched the threshold value conditions at the Location. Sum of daily average observed values matching threshold criteria divided by the Number of Threshold Condition Days.
Number of Threshold Condition Days	Total number of days during the requested period when observed River Parameter conditions matched the threshold value conditions at the Location.
Percent of Days Analyzed matching Threshold Condition	Number of Threshold Condition Days divided by Total Number of Days Analyzed.
Date(s) When River Parameter Crosses Threshold	The dates when the observed value for the River Parameter is equal to the Threshold Value, and dates when the observed value for the River Parameter crosses below or above the Threshold Value.