Reference Lists The HYDROML contains many codes that describe an condition and type of item. These codes are contained in reference lists which are contained in the United States Geological Survey's National Water Information System's data base. Listed below are the reference lists with names and definitions of all of the codes used.

Name	HTML Document	Description	XML File Name
Method of Determination of Accuracy	List	A reference list containing codes that describe the methods for determining accuracy (or uncertainty) of a value.	AccuracyCodeList.xml
Adaps Site Type	List	ADAPS site code. Indicates whether the site is slope-affected, index velocity, a structure like a dam, etc.	AdapsSiteTypeList.xml
Acoustic Doppler Current Profiler Frequency	List	A reference list containing codes that describe the frequencies used by a Acoustic Doppler Current Profiler (ADCP) meter used for stream discharge measurements.	AdcpFrequencyList.xml
ADCP Area Computation Method	List	A reference list containing codes that describe the area computation methods for a Acoustic Doppler Current Profiler (ADCP) stream discharge measurement.	AreaComputationMethodList.xml
Stream Base Flow	List	A reference list containing codes that describe if the streamflow is base flow or not.	BaseFlowList.xml
ADCP Bottom Estimate Method	List	A reference list containing codes that describe the methods used for bottom estimate for a Acoustic Doppler Current Profiler (ADCP) stream discharge measurement.	BottomEstimateList.xml
Bottom Mode	List	A reference list containing codes that describe the modes used for bottom tracking for a Acoustic Doppler Current Profiler (ADCP) stream discharge measurement.	BottomModeList.xml
Calibration Type	List	A reference list containing codes that describe whether the monitor reading is for calibration or recalibration.	CalibrationCodeList.xml
Stream Channel Conditions	List	A reference list containing codes that describe the condition of the streamflow control section.	ChannelConditionsList.xml
QW Monitor Check Reading Code	List	A code indicating if the check reading was before or after cleaning or after calibration (final)	CheckReadingCodeList.xml
Specific Conductance Standard Type	List	A reference list containing codes that describe the types of the specific conductance standard, KCl or NaCl used in a conductance sensor calibration.	ConductanceStandardList.xml
Stream Control Cleaning	List	A reference list containing codes that describe whether the streamflow control section was cleaned or not.	ControlCleanedList.xml
Stream Control Conditions	List	A reference list containing codes that describe the condition of the streamflow control section.	ControlConditionsList.xml
Stream Control Description	List	A reference list containing codes that describe the states of the streamflow control section.	ControlDescriptionList.xml
Crest stage gage Insection Read	List	A reference list containing codes that describe if a reading of the crest-stage gage intake was done.	CrestStageGageInspectionReadList.xml
Cross Section Survey Method	List	A reference list containing codes that describe the method of the cross section survey.	CrossSectionSurveyMethodList.xml
Current Meter Location Inspection Performed	List	A reference list containing codes that describe the locations of the velocity meter inspection (office, field, etc.)	CurrentMeterInspectionLocationList.xml
Current Meter Suspension	List	A reference list containing codes that describe the types of velocity meter suspensions.	CurrentMeterSuspensionList.xml
Data Aging Status	List	The reference table containing the codes, names, and descriptions of the valid phases of the data aging process.	DataAgingList.xml
Desiccant Condition	List	A reference list containing codes that describe the conditions of bubble gage desiccant.	DesiccantConditionList.xml
Stream Discharge Measurement Adjustment	List	A reference list containing codes that describe the methods of adjustment for the discharge value.	DischargeMeasurementAdjustmentList.xml
Stream Discharge Measurement Quality	List	A reference list containing codes that describe the valid stream discharge measurement quality qualifiers.	DischargeMeasurementQualityList.xml
Stream Discharge Measurement channel Condition	List	A reference list containing codes that describe the conditions of the stream channel (stable, unstable, even, uneven, etc.)	DischargeMeasurementChannelConditionList.xml
Discharge Measurement Type	List	A reference list containing codes that describe the types of stream discharge measurements (wading, bridge, ice, boat, etc.)	DischargeMeasurementTypeList.xml
Dissolved Oxygen Reading Type	List	A reference list containing codes that describe the types of dissolved oxygen readings, saturated air, saturated water, etc.	DissolvedOxygenReadingList.xml
Drift Check Dissolved Oxygen Reading method Type	List	A reference list containing codes that describe the types of dissolved oxygen readings, saturated air, saturated water, etc.	DriftCheckDOReadingMethodCodeList.xml
DST Period	List	Not Available	DSTPeriodList.xml
Type of Estimated Velocity	List	A reference list containing codes that describe the origins of the estimated velocity.	EstimatedVelocityList.xml
Curve Expansion type	List	A reference list containing codes that describe the valid curve expansion methods.	ExpandList.xml
Gage Measurement Point	List	A reference list containing codes that describe the valid gage measurement points.	GageMeasurementPointCodeList.xml
Relative Location from Gage	List	A reference list containing codes that describe the location of the control, in effect for the discharge measurement, relative to the gage.	GageRelativeLocationList.xml
Manometer Gas System	List	A reference list containing codes that describe the types of gas system.	GasSystemList.xml
Stream Horizontal Flow Distribution	List	A reference list containing codes that describe the horizontal flow distribution in the stream cross-section. That is, whether the flow is evenly or unevenly distributed bank to bank.	HorizontalFlowDistributionList.xml
Intake Hole Condition	List	A reference list containing codes that describe the conditions of the crest-stage gage intake holes.	IntakeHoleConditionList.xml
Intake Serviced	List	A reference list containing codes that describe the types of servicing of a water level intake.	IntakeServicedList.xml
Magnetic Variation Determination Method	List	A reference list containing codes that describe the methods of determining magnetic variation.	MagneticVariationList.xml
Streamflow Measured Discharge Methods	List	A reference list containing codes that describe the methods to measure discharge in a stream	MeasuredDischargeMethodList.xml
ADCP Navigation Method	List	A reference list containing codes that describe the navigation methods for an Acoustic Doppler Current Profiler (ADCP) discharge measurement.	NavigationMethodList.xml
Orifice Serviced	List	A reference list containing codes that describe the types of servicing of a bubbler gage orifice.	OrificeServicedList.xml
QW Monitor Inspection stream stage condition Code	List	A reference list containing codes that describe the conditions of the stage at the time of the QW monitor inspection.	QwMonitorStageConditionList.xml
QW Remark Codes	List	Result remark.	QwRemarkList.xml
Streamflow Stage Methods	List	A reference list containing codes that describe the methods used to sense stream stage.	StageMethodList.xml
Measurement Starting Point	List	A reference list containing codes that describe the types of measurement starting points.	StartPointList.xml
Quality of Stream Mixing	List	A reference list containing codes that describe the quality of the stream mixing.	StreamMixingList.xml
Type of Suspension Weight Used	List	A reference list containing codes that describe the types and sizes of suspension weights.	SuspensionWeightList.xml
Time Datum	List	A reference list containing codes that describe the time datums that are assigned to a date and time.	TimeDatumList.xml
Time Zone	List	Not Available	TimeZoneList.xml
ADCP Top Estimate Method	List	A reference list containing codes that describe the methods used for top estimate.	TopEstimateList.xml
Turbidity Standard Type	List	A reference list containing codes that describe the types of turbidity standard being used, formazin, polymer bead, etc.	TurbidityStandardList.xml
Method of Determining Uncertainty	List	A reference list containing codes that describe the methods of determining uncertainty.	UncertaintyCodeList.xml
Stream Velocity Description	List	A reference list containing codes that describe the vertically flow distribution within the cross-section. That is, whether the vertical distribution of flow within the cross-section is mostly turbulent or smooth.	VelocityDescriptionList.xml
Streamflow Velocity Methods	List	A reference list containing codes that describe the methods used to measure streamflow velocity.	VelocityMethodList.xml
Stream Velocity Observation	List	A reference table for codes that describe the types of velocity observations for a stream discharge measurement.	VelocityObservationList.xml
Vent Hole Condition	List	A reference list containing codes that describe the conditions of the vent holes for a crest-stage gage.	VentHoleConditionList.xml
ADCP Water Mode Setting	List	A reference list containing codes that describe the water mode which is a number used with ADCP's made by RD Instruments to indicate the method used to collect water velocity profiles. The possible values are 1, 5, 8, and 11.	WaterModeList.xml