Gage height of annual peak values may be qualified using the following codes:

Code	Description
1	The gage height was affected by backwater.
2	The gage height was not the maximum for the year.
3	The gage height was at different site and/or datum.
4	The gage height was below minimum recordable elevation.
5	The gage height is an estimate.
6	The gage height datum changed during this year.
blank	No remark.

Notes:

• If gage height code 2 is given, then a date and data entries should be made for the maximum annual gage height.