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The Flood Event Viewer's High-water Mark Data report creates a FilteredHWMs.csv or FilteredHWMs.json file for the current selected event.  The data dictionary for this event is shown below, and users can downloaded the dictionary here as a CSV file.

FieldDefinition
latitude_ddHorizontal location of HWM in decimal degrees (not location of associated site)
longitude_ddHorizontal location of HWM in decimal degrees (not location of associated site)
latituderepeat of latitude_dd
longituderepeat of longitude_dd
eventNameEvent name
hwmTypeNameType of HWM evience.  See hwm_type_id for current possibilities.
hwmQualityNameFlagging uncertainty of HWM.  See hwm_quality_id for current possibilities.
verticalDatumNameReference datum used to survey elevation of HWM.  See vdatum_id for current possibilities.
verticalMethodNameSurvey method for establishing elevation of HWM.  See vcollect_method_id for current possilities:
approvalMemberUSGS employee responsible for approving this HWM record
markerNameType of marker used to flag the HWM prior to survey.  See marker_id for current possibilities:
horizontalMethodNameMethod used to establish the horizontal location of the HWM (often at time of flagging).  See hcollect_method_id for possible values.
horizontalDatumNameReference datum used to establish the horizontal location of the HWM (often at time of flagging)
flagMemberNameUSGS employee who flagged the HWM
surveyMemberNameUSGS employee who surveyed the HWM elevation
site_noFull site number (including State/County abbreviation and site ID)
siteDescriptionDescription of Site
sitePriorityNameSite deployment priority (used primarily for sensor deployments, not HWM campaigns).  Possibilities include:
Network critical
Secondary development
Desired but not required
networkNamesUSGS groupings of sites (may overlap).  Possibilities include:
Coastal Change Hazards (CCH)
Gulf of Mexico
North Atlantic
Not Defined
SCoRE
South Atlantic
SWaTH
stateNameState abbreviation
countyNameCounty name
siteZoneUSGS water science center zone designation (largely unused)
sitePermHousingIndicates established equipment location
site_latitudeHorizontal location of Site of common water surface (not location of HWM)
site_longitudeHorizontal location of Site of common water surface (not location of HWM)
hwm_idUnique ID assigned to each HWM in the system
waterbodyBody of water most likely associated with the HWM
site_idUnique integer ID assigned to each Site in the system
event_idUnique integer ID assigned to each Event in the system
hwm_type_idHWM type code.  Current possibilities:
1 Mud
2 Debris
3 Clear water
4 Vegetation line
5 Seed line
6 Stain line
7 Melted snow line
8 Present at peak (direct observation)
9 Other (Note in Description box)
hwm_quality_idHWM quality code.  Current possibilities:
1 Excellent: +/- 0.05 ft
2 Good: +/- 0.10 ft
3 Fair: +/- 0.20 ft
4 Poor: +/- 0.40 ft
5 VP: > 0.40 ft
6 Unknown/Historical
hwm_locationdescriptionNarrative of location of HWM at time of flagging
survey_dateDate HWM was surveyed (not date of peak)
elev_ftSurveyed elevation of HWM in feet
vdatum_idCode for reference datum of vertical survey of HWM.  Current Possibilities:
1 local control point
2 NAVD88
3 Above Ground Level
4 NGVD29
6 PRVD02
7 VIVD09
8 International Great Lakes Datum of 1985
vcollect_method_idCode for vertical survey method of HWM.  Current possibilities:
1 Tape measure
2 Level Gun
3 Hand level
4 Other (Note in Description box)
5 Total Station
6 RT-GNSS
7 Static-GNSS
bankLocation of HWM relative to stream as viewed from upstream looking downstream.  Choices: "Left", "Right", or "N/A".
approval_id? unknown ?
marker_idMarker type used to flag the HWM.  Current possibilities:
1 Chalk test
2 Tape
3 Paint
4 Marker
5 Nail
6 Nail and HWM tag
7 Stake
8 Not marked
9 Other (Note in Description box)
10 Chiseled mark
height_above_gndDistance from HWM down to ground surface in feet.  Note: use with care; these values are often estimated or rough measurements that could include tree roots, sloping surfaces, etc. immediately beneath the HWM.
hcollect_method_idMethod used to find horizontal location of HWM.  Possible values:
1 Handheld GPS
2 Static-GNSS
3 Phone/Car GPS
4 Map (digital or paper)
5 Other (Note in Description box)
6 RT-GNSS
peak_summary_idUnique integer id assigned to each Peak.  Peaks can be assigned to a selected location for a selected event.  One or more HWM or sensor reading can be associated with a peak as evidence of that peak.
hwm_notesPrimarily surveyors notes but could be flagging notes as well.
hwm_environmentFlooding caused by Coastal storm or Riverine event.
flag_dateDate HWM was flagged for later surveying (not date of peak)
stillwater1 = HWM was likely caused in tranquil water location
0 = HWM was likely caused by swiftly moving water
hdatum_idCode for reference datum of hoizontal location of HWM.  Current Possibilities:
1 local control point
2 NAD83
3 NAD27
4 WGS84 (from Digital Map)
5 NAD 83( CORS96) epoch 2002
6 NAD 83 (NSRS2007) epoch 2007
7 NAD 83 (2011) epoch 2010
flag_member_idSystem id of USGS employee who flagged the HWM
survey_member_idSystem id of USGS employee who surveyed the HWM
uncertaintyUncertainty of HWM survey, in feet.  Note that total uncertainty is a combination of surveyed uncertainty, flagging uncertainty, and other potential factors.
hwm_uncertaintyUncertainty of HWM flagging, in feet.  If blank, technician did not specified a flagging Quality but not a numeric flagging uncertainty (see hwmQuality_id or hwmQualityName).  Note that total uncertainty is a combination of surveyed uncertainty, flagging uncertainty, and other potential factors.
hwm_labelName given to HWM to distinguish between this and other HWMs at the same location.

Contact tkoenig@usgs.gov for questions or corrections to this page.

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