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This section provides for the display of annual
peak streamflow values
for both continuous and partial-record gaging stations.
Annual peak flow values are the maximum instantaneous
streamflow values recorded at a particular site for
the entire water year from October 1 to September 30.
A note of caution that the annual peak flow
value may not occur at the same time the maximum
water level occurs due to conditions such as
backwater, tidal fluctuations,
etc.
The following codes are used to indicate special conditions
that affect how the peak streamflow value may be interpreted
| Code |
Meaning |
| 1 | Discharge is a Maximum Daily Average |
| 2 | Discharge is an Estimate |
| 3 | Discharge affected by Dam Failure |
| 4 | Discharge less than indicated value
which is Minimum Recordable Discharge at this site
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| 5 | Discharge affected to unknown degree by Regulation or Diversion |
| 6 | Discharge affected by Regulation or Diversion |
| 7 | Discharge is an Historic Peak |
| 8 | Discharge actually greater than indicated value |
| 9 | Discharge due to Snowmelt, Hurricane, Ice-Jam or Debris Dam breakup |
| A | Year of occurrence is unknown or not exact |
| Bd | Day of occurrence is unknown or not exact |
| Bm | Month of occurrence is unknown or not exact |
| C | All or part of the record affected by Urbanization, Mining, Agricultural changes, Channelization, or other |
| F | Peak supplied by another agency |
| O | Opportunistic value not from systematic data collection |
| R | Revised |
Peak flow data for gaging stations can be selected as follows:
- Start at the peak streamflow search page
- Specify one or more search criteria, such as "Drainage Area".
- The definition of each of these search criteria can be
seen by clicking on the
next to each option.
- Click submit to proceed further with the search.
- The ability to set specifications
according to the selected search criteria is given
on the next page.
- The next step is to decide upon how your results should
be displayed.
- You can select how the results are grouped and
sorted by clicking on the appropriate dot.
- The data period allows for
a specific time frame of data retrieval for the stations
peaks.
- The output format are different computer file
formats which allow for easy input into certain
software packages, such as a spreadsheet.
- Click submit once your specific criteria are set.
- A list of all stations that have peak streamflow values
for the criteria you set are then provided in the
output format you selected.
The following codes are used to indicate special conditions
that affect how the peak gage height value may be interpreted
| Code |
Meaning |
| 1 | Gage height affected by backwater |
| 2 | Gage height not the maximum for the year |
| 3 | Gage height at different site and(or) datum |
| 4 | Gage height below minimum recordable elevation |
| 5 | Gage height is an estimate |
| 6 | Gage datum changed during this year |
| 7 | Debris, mud, or hyper-concentrated flow |
| 8 | Gage height tidally affected |
| Bm | Month of occurrence is unknown or not exact |
| Bd | Day of occurrence is unknown or not exact |
| F | Peak supplied by another agency |
| R | Revised |
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U.S. Department of the Interior |
U.S. Geological Survey