The -901 means the data value is missing.
This can happen due to remote gage mechanical malfunction or interrupted data transfers. The -901 value can also be placed in the data set by Water Managements data quality checking programs or the database manager. Our data is checked for specific quality characteristcs automatically every hour and verified manually once a day.

Quality Characteristics Tested:

• Absolute Magnitude

• Duration Magnitude

• Rate of Change

• Constant Value

The -902 number means the data value is invalid.
If the incoming data values fail a quality check, the value sent is replaced by a -902 value. The database manager can then decide to change the value to a -901 (missing value), or replace the bad value with an accurate data value.

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Last Updated on Thursday, June 05, 1997 05:24:25 PM