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	Method for determining accuracy (or uncertainty)	AccuracyCodeList.xml
ADAPS Site Type	List	ADAPS site code. Indicates whether the site is slope-affected, index velocity, a structure like a dam, etc.	AdSiteList.xml
Acoustic Doppler Current Profiler Frequency	List	A reference table for 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 table for 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 table for codes that describe if the streamflow is base flow or not.	BaseFlowList.xml
ADCP Bottom Estimate Method	List	Code indicating method used for bottom estimate	BottomEstimateList.xml
Bottom Mode	List	Mode used for bottom tracking	BottomModeList.xml
Calibration Type	List	Code indicating whether the reading is for calibration or recalibration	CalibrationCodeList.xml
Stream Channel Evenness Types	List	Not Available	ChannelEvennessList.xml
Stream Channel Material Types	List	Not Available	ChannelMaterialList.xml
Stream Channel Stability Types	List	Not Available	ChannelStabilityList.xml
QW Monitor Check Reading Time 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	The type of the specific conductance standard, KCl or NaCl	ConductanceStandardList.xml
Stream Control Cleaning	List	A reference table for codes that describe the whether the streamflow control section was cleaned.	ControlCleanedList.xml
Stream Control Conditions	List	A reference table for codes that describe the condition of the streamflow control section.	ControlConditionsList.xml
Stream Control Description	List	A reference table for codes that describe the state of the streamflow control section.	ControlDescriptionList.xml
Crest stage gage Insection Read	List	A reference table for codes that indicate if a reading of the crest-stage gage intake was done.	CrestStageGageInspectionReadList.xml
Cross Section Survey Method	List	Code indicating the cross section survey method (parameter code 82398)	CrossSectionSurveyMethodList.xml
Current Meter Location Inspection Performed	List	Code indicating the location of the velocity meter inspection (office, field, etc.)	CurrentMeterInspectionLocationList.xml
Current Meter Suspension	List	A reference table for 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	Code indicating the condition of the desiccant	DesiccantConditionList.xml
Stream Discharge Measurement Adjustment	List	Discharge code. The code describing the method of adjustment for the discharge value.	DischargeMeasurementAdjustmentList.xml
Stream Discharge Measurement Quality	List	The reference table containing the codes, names, and descriptions of the valid stream discharge measurement quality qualifiers.	DischargeMeasurementQualityList.xml
Discharge Measurement Type	List	The code identifying a stream discharge measurement type (wading, bridge, ice, boat, etc.)	DischargeMeasurementTypeList.xml
Dissolved Oxygen Reading Type	List	A code indicating the type of dissolved oxygen reading, saturated air, saturated water, etc.	DissolvedOxygenReadingList.xml
DST Period	List	Not Available	DstPeriodList.xml
Equipment Types	List	Not Available	EquipmentCodeList.xml
Type of Estimated Velocity	List	A reference table for codes that describe the origin of the estimated velocity.	EstimatedVelocityList.xml
Gage Measurement Point	List	The reference table containing the codes, names, and descriptions of the valid gage measurement points.gage_mp_cd	GageMeasurementPointCodeList.xml
Relative Location from Gage	List	Code indicating the location of the control in effect for the discharge measurement relative to the gage.	GageRelativeLocationList.xml
Manometer Gas System	List	Code indicating type of gas system	GasSystemList.xml
Stream Horizontal Flow Distribution	List	The code identifying 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	The code indicating the condition of the crest-stage gage intake holes.	IntakeHoleConditionList.xml
Intake Serviced	List	A reference table for codes that describe the type of servicing of a water level intake.	IntakeServicedList.xml
Magnetic Variation Determination Method	List	Code for method of determining magetic variation	MagneticVariationList.xml
Streamflow Measured Discharge Methods	List	null	MeasuredDischargeMethodList.xml
Method	List	null	MethodList.xml
Method Type	List	null	MethodTypeList.xml
ADCP Navigation Method	List	A reference table for codes that describe the navigation method for an Acoustic Doppler Current Profiler (ADCP) discharge measurement.	NavigationMethodList.xml
Orifice Serviced	List	A reference table for codes that describe the type of servicing of a bubbler gage orifice.	OrificeServicedList.xml
QW Monitor Check Reading Time Code	List	Code indicating the condition of the stage at the time of the qw monitor inspection	QwMonitorStageConditionList.xml
QW Remark Codes	List	Not Available	QwRemarkList.xml
Streamflow Stage Methods	List	null	StageMethodList.xml
Measurement Starting Point	List	A reference table for codes that describe the type of starting point	StartPointList.xml
Quality of Stream Mixing	List	Code indicating the quality of the stream mixing	StreamMixingList.xml
Type of Suspension Weight Used	List	The code describing the type and size of suspension weight	SuspensionWeightList.xml
Time Datum	List	Not Available	TimeDatumList.xml
Time Zone	List	Time zone offset. An ANSI SQL/92 time zone offset string. Some examples are '-07:00' (Eastern), '+02:00' (Eastern Europe), and '+03:30' (India).	TimeZoneList.xml
ADCP Top Estimate Method	List	Code indicating method used for top estimate	TopEstimateList.xml
Turbidity Standard Type	List	A code indicating the type of turbidity standard being used, formazin, polymer bead, etc.	TurbidityStandardList.xml
Method of Determining Uncertainty	List	Code indicating the method of determining uncertainty	UncertaintyCodeList.xml
Velocity Distribution	List	Not Available	VelocityDistributionList.xml
Streamflow Velocity Methods	List	null	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 table for codes that describe the condition of the vent holes for a crest-stage gage.	VentHoleConditionList.xml
Vertical Velocity Distribution	List	Not Available	VerticalVelocityDistributionList.xml
Volumetric Units	List	Volumetric Units for SiteVisit Volumetric Measurements	VolumetricUnitsList.xml
ADCP Water Mode	List	The water mode 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
Wiper cleaned and changed codes	List	Not Available	WiperList.xml