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NWIS Peak Discharge and Gage Height Qualification codes
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 Peak Streamflow-Qualification Codes(peak_cd):
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# 1 ... Discharge is a Maximum Daily Average
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# 2 ... Discharge is an Estimate
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# 3 ... Discharge affected by Dam Failure
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# 4 ... Discharge less than indicated value,
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# which is Minimum Recordable Discharge at this site
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# 5 ... Discharge affected to unknown degree by
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# Regulation or Diversion
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# 6 ... Discharge affected by Regulation or Diversion
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# 7 ... Discharge is an Historic Peak
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# 8 ... Discharge actually greater than indicated value
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# 9 ... Discharge due to Snowmelt, Hurricane,
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# Ice-Jam or Debris Dam breakup
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# A ... Year of occurrence is unknown or not exact
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# B ... Month or Day of occurrence is unknown or not exact
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# C ... All or part of the record affected by Urbanization,
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# Mining, Agricultural changes, Channelization, or other
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# D ... Base Discharge changed during this year
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# E ... Only Annual Maximum Peak available for this year
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#
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# Gage height qualification codes(gage_ht_cd,ag_gage_ht_cd):
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# 1 ... Gage height affected by backwater
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# 2 ... Gage height not the maximum for the year
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# 3 ... Gage height at different site and(or) datum
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# 4 ... Gage height below minimum recordable elevation
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# 5 ... Gage height is an estimate
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# 6 ... Gage datum changed during this year
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