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Parameter Code Definition

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Parameter Code Group Name Parameter Name/Description Epa equivalence Result Statistical Basis Result Time Basis Result Weight Basis Result Particle Size Basis Result Sample Fraction Result Temperature Basis CASRN SRSName Parameter Unit
00004 Physical Stream width, feet Agree Instream features, est. stream width ft
00010 Physical Temperature, water, degrees Celsius Agree Temperature, water deg C
00011 Physical Temperature, water, degrees Fahrenheit Agree Temperature, water, deg F deg F
00012 Physical Evaporation temperature, 48 inch pan, degrees Celsius Agree deg C
00013 Physical Evaporation temperature, 24 inch pan, degrees Celsius Agree deg C
00014 Physical Wet bulb temperature, degrees Celsius Agree Temperature, wet bulb deg C
00020 Physical Temperature, air, degrees Celsius Agree Temperature, air, deg C deg C
00021 Physical Temperature, air, degrees Fahrenheit Agree Temperature, air, deg F deg F
00025 Physical Barometric pressure, millimeters of mercury Agree Barometric pressure mm/Hg
00030 Physical Incident solar radiation intensity, calories per square centimeter per day Agree Solar irradiation, local cal/cm2/d
00031 Physical Incident light remaining at depth, percent Agree Light attenuation at measurement depth %
00032 Physical Cloud cover, percent Agree Cloud cover (percent) %
00034 Physical Depth to 1 percent of surface light, feet Agree Light attenuation, depth at 99% ft
00035 Physical Wind speed, miles per hour Agree Wind velocity mph
00036 Physical Wind direction, degrees clockwise from true north Agree Wind direction Deg
00045 Physical Precipitation, total, inches Agree Total Precipitation in
00046 Physical Precipitation, total, inches per week Agree Total Precipitation in/week
00047 Physical Total partial pressure of dissolved gases, water, unfiltered, millimeters of mercury Agree Dissolved Partial pressure of dissolved gases mm/Hg
00048 Physical Total partial pressure of dissolved gases, water, unfiltered, percent of saturation Agree Dissolved Partial pressure of dissolved gases %
00049 Physical Surface area, square miles Agree mi2
00050 Physical Evaporation total, inches per day Agree Evaporation inches/day
00051 Physical Surface area, square feet Agree ft2
00052 Physical Relative humidity, percent Agree Relative humidity %
00053 Physical Surface area, acres Agree ac
00055 Physical Stream velocity, feet per second Agree Stream velocity ft/sec
00056 Physical Flow rate of well, gallons per day Not checked gal/day
00058 Physical Flow rate of well, gallons per minute Not agree gal/min
00059 Physical Flow rate, instantaneous, gallons per minute Agree Flow rate, instantaneous gal/min
00060 Physical Discharge, cubic feet per second Not checked Mean 1 Day Stream flow, mean. daily ft3/s
00061 Physical Discharge, instantaneous, cubic feet per second Agree Stream flow, instantaneous ft3/s
00062 Physical Elevation of reservoir water surface above datum, feet Agree ft
00064 Physical Mean depth of stream, feet Agree Mean Depth ft
00065 Physical Gage height, feet Agree Height, gage ft
00067 Physical Tide stage, code Agree Tide stage code
00070 Physical Turbidity, water, unfiltered, Jackson Turbidity Units Agree Total Turbidity JTU
00072 Physical Stream stage, meters Agree Stream stage m
00074 Physical Light transmission, 1 meter path length, water, unfiltered, percent Agree Total %
00075 Physical Turbidity, water, unfiltered, Hellige turbidimeter, milligrams per liter as silicon dioxide Agree Total Turbidity, hellige mg/l SiO2
00076 Physical Turbidity, water, unfiltered, nephelometric turbidity units Not agree Total Turbidity NTU
00077 Physical Transparency, water, in situ, Secchi disc, inches Agree Water transparency, Secchi disc in
00078 Physical Transparency, water, in situ, Secchi disc, meters Agree Water transparency, Secchi disc m
00080 Physical Color, water, filtered, platinum cobalt units Agree Dissolved Color PCU
00081 Physical Apparent color, water, unfiltered, platinum-cobalt units Agree Total Apparent color PCU
00085 Physical Odor at room temperature, threshold odor number Agree Odor threshold number TON
00086 Physical Odor at 60 degrees Celsius, threshold odor number Agree 60 deg C Odor threshold number TON
00090 Physical Oxidation reduction potential, reference electrode not specified, millivolts Agree Oxidation reduction potential (ORP) mV
00094 Physical Specific conductance, water, unfiltered, field, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
00095 Physical Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
00096 Physical Salinity, water, unfiltered, milligrams per milliliter at 25 degrees Celsius Agree Total 25 deg C Salinity mg/mL @25C
00117 Physical Precipitation, duration of storm event, minutes Agree Precipitation event duration minutes
00118 Physical Precipitation, cumulative at given time, location 6, inches Agree Precipitation in
00119 Physical Precipitation, cumulative at given time, location 5, inches Agree Precipitation in
00120 Physical Precipitation, cumulative at given time, location 4, inches Agree Precipitation in
00121 Physical Precipitation, cumulative at given time, location 3, inches Agree Precipitation in
00122 Physical Precipitation, cumulative at given time, location 2, inches Agree Precipitation in
00123 Physical Precipitation, cumulative at given time, location 1, inches Agree Precipitation in
00124 Physical Precipitation, intensity at given time, location 6, inches per hour Agree Precipitation in/hr
00125 Physical Precipitation, intensity at given time, location 5, inches per hour Agree Precipitation in/hr
00126 Physical Precipitation, intensity at given time, location 4, inches per hour Agree Precipitation in/hr
00127 Physical Precipitation, intensity at given time, location 3, inches per hour Agree Precipitation in/hr
00128 Physical Precipitation, intensity at given time, location 2, inches per hour Agree Precipitation in/hr
00129 Physical Precipitation, intensity at given time, location 1, inches per hour Agree Precipitation in/hr
00164 Physical Flow, gallons per batch Agree Flow, gallons per batch gal/batch
00193 Physical Precipitation total for defined period, inches Agree Total Precipitation in
00196 Physical Wind run, miles Agree mi
00197 Physical Evaporation, accumulated, inches Agree Evaporation in
00198 Physical Depth to 10 percent of surface light, feet Agree ft
00199 Physical Depth to 50 percent of surface light, feet Agree Light attenuation, depth at 50% ft
00200 Physical Incident light intensity, 400-700 nanometers, microeinsteins per square meter per second Agree uE/m2/sec
00201 Physical Incident light, daily total, 400-700 nanometers, microeinsteins per square meter Agree Daily Total uEinst/m2
00294 Physical Chemical oxygen demand, soluble, dry atmospheric deposition, milligrams per kilogram Not checked Chemical oxygen demand mg/kg
00296 Physical Chemical oxygen demand, insoluble, dry atmospheric deposition, milligrams per kilogram Not checked Chemical oxygen demand mg/kg
00297 Physical Chemical oxygen demand, total, dry atmospheric deposition, milligrams per kilogram Not checked Total Chemical oxygen demand mg/kg
00302 Physical Immediate oxygen demand, water, unfiltered, 20 degrees Celsius, milligrams per liter Not checked Total 20 deg C mg/l
00310 Physical Biochemical oxygen demand, water, unfiltered, 5 days at 20 degrees Celsius, milligrams per liter Not checked 5 Day Total 20 deg C Biochemical oxygen demand, standard conditions mg/l
00315 Physical Biochemical oxygen demand, water, unfiltered, 7 days at 20 degrees Celsius, milligrams per liter Not checked 7 Day Total 20 deg C Biochemical oxygen demand, non-standard conditions mg/l
00319 Physical Ultimate biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, milligrams per liter Not checked Ultimate Total 20 deg C BOD, ultimate mg/l
00320 Physical Ultimate carbonaceous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, milligrams per liter Not checked Ultimate Total 20 deg C Carbonaceous biochemical oxygen demand, non-standard conditions mg/l
00321 Physical Ultimate nitrogenous biochemical oxygen demand, water, unfiltered, milligrams per liter Not checked Ultimate Total Nitrogenous biochemical oxygen demand mg/l
00324 Physical Biochemical oxygen demand, water, unfiltered, 20 days at 20 degrees Celsius, milligrams per liter Not checked 20 Day Total 20 deg C Biochemical oxygen demand, non-standard conditions mg/l
00325 Physical Deoxygenation constant (k1 to base e), biochemical oxygen demand, 20 degrees Celsius, water, unfiltered, per day Not checked Total 20 deg C per day
00330 Physical Reoxygenation constant (k2 to base e), water, unfiltered, per day Not checked Total per day
00335 Physical Chemical oxygen demand, low level, water, unfiltered, milligrams per liter Not checked Total Chemical oxygen demand, (low level) mg/l
00339 Physical Chemical oxygen demand, bed sediment, total, dry weight, milligrams per kilogram Not checked Dry Bed Sediment Chemical oxygen demand mg/kg
00340 Physical Chemical oxygen demand, high level, water, unfiltered, milligrams per liter Not checked Total Chemical oxygen demand, (high level) mg/l
00349 Physical Biochemical oxygen demand, water, unfiltered, 30 days at 20 degrees Celsius, milligrams per liter Not checked 30 Day Total 20 deg C Biochemical oxygen demand, non-standard conditions mg/l
00359 Physical Biochemical oxygen demand, water, filtered, 5 days at 20 degrees Celsius, milligrams per liter Agree 5 Day Dissolved 20 deg C BOD, filtered, 5 day, 20 deg C mg/l
00367 Physical Chemical oxygen demand, low level, water, filtered, milligrams per liter Not checked Dissolved Chemical oxygen demand, (low level) mg/l
00400 Physical pH, water, unfiltered, field, standard units Agree Total pH std units
00401 Physical Cations minus anions, water, milliequivalents Agree Cations-Anions meq
00402 Physical Specific conductance, non-temperature corrected, water, unfiltered, microsiemens per centimeter Agree Total Specific conductance uS/cm
00403 Physical pH, water, unfiltered, laboratory, standard units Agree Total pH, lab std units
00408 Physical pH, water, filtered, laboratory, standard units Not checked Dissolved std units
00434 Physical pH adjusted to 25 degrees Celsius, water, laboratory, standard units Not checked 25 deg C std units
00480 Physical Salinity, water, unfiltered, parts per thousand Not checked Total Salinity ppth
00495 Physical Moisture content, fraction of dry weight, percent Not checked Dry Moisture content %
00500 Physical Total solids dried at 105 degrees Celsius, water, unfiltered, milligrams per liter Not checked Total 105 deg C Total solids mg/l
00505 Physical Loss on ignition of total solids, water, unfiltered, milligrams per liter Not checked Total Total volatile solids mg/l
00510 Physical Total solids remaining after ignition, water, unfiltered, milligrams per liter Not checked Total Total fixed solids mg/l
00515 Physical Dissolved solids dried at 105 degrees Celsius, water, filtered, milligrams per liter Not checked Dissolved 105 deg C Total dissolved solids mg/l
00520 Physical Loss on ignition of dissolved solids, water, filtered, milligrams per liter Not checked Dissolved Volatile dissolved solids mg/l
00525 Physical Dissolved solids remaining after ignition, water, filtered, milligrams per liter Not checked Dissolved Fixed dissolved solids mg/l
00530 Physical Suspended solids, water, unfiltered, milligrams per liter Not checked Non-filterable Total suspended solids mg/l
00535 Physical Loss on ignition of suspended solids, water, unfiltered, milligrams per liter Not checked Non-filterable Volatile Suspended Solids mg/l
00540 Physical Suspended solids remaining after ignition, water, unfiltered, milligrams per liter Not checked Fixed suspended solids mg/l
00545 Physical Settleable solids, water, unfiltered, milligrams per liter Not checked Settleable Settleable solids mg/l
00548 Physical Non-settleable solids remaining after ignition, milligrams per liter Not checked mg/l
00549 Physical Loss on ignition of non-settleable solids, milligrams per liter Not checked Non-settleable mg/l
00898 Physical Carbonate hardness, water, filtered, milligrams per liter as calcium carbonate USGS use and no use by EPA Dissolved Hardness, carbonate mg/l CaCO3
00900 Physical Hardness, water, milligrams per liter as calcium carbonate Agree Total hardness -- SDWA NPDWR mg/l CaCO3
00901 Physical Carbonate hardness, water, unfiltered, milligrams per liter as calcium carbonate Not checked Total Hardness, carbonate mg/l CaCO3
00902 Physical Noncarbonate hardness, water, unfiltered, field, milligrams per liter as calcium carbonate Not checked Total Hardness, non-carbonate mg/l CaCO3
00903 Physical Noncarbonate hardness, water, unfiltered, lab, milligrams per liter as calcium carbonate Not checked Total Hardness, non-carbonate mg/l CaCO3
00904 Physical Noncarbonate hardness, water, filtered, field, milligrams per liter as calcium carbonate Not checked Dissolved Hardness, non-carbonate mg/l CaCO3
00905 Physical Noncarbonate hardness, water, filtered, lab, milligrams per liter as calcium carbonate Not checked Dissolved Hardness, non-carbonate mg/l CaCO3
00906 Physical Hardness, water, filtered, calculated, milligrams per liter as calcium carbonate USGS use and no use by EPA Dissolved Total hardness -- SDWA NPDWR mg/l CaCO3
00907 Physical Hardness, water, unfiltered, calculated, milligrams per liter as calcium carbonate USGS use and no use by EPA Total Total hardness -- SDWA NPDWR mg/l CaCO3
00908 Physical Hardness, water, filtered, measured, milligrams per liter as calcium carbonate USGS use and no use by EPA Dissolved Total hardness -- SDWA NPDWR mg/l CaCO3
00909 Physical Hardness, water, unfiltered, measured, milligrams per liter as calcium carbonate USGS use and no use by EPA Total Total hardness -- SDWA NPDWR mg/l CaCO3
01305 Physical Suds or foam, severity, code Not checked Detergent, severity code
01310 Physical Gas bubbles, severity, code Not checked Gas bubble severity code
01315 Physical Floating sludge, severity, code Not checked Floating sludge, severity code
01320 Physical Floating garbage, severity, code Not checked Trash, Debris, Floatables code
01325 Physical Floating algae mats, severity, code Not checked Algae, floating mats (severity) code
01330 Physical Odor, atmospheric, severity, code Not checked Odor, atmospheric code
01335 Physical Sewage solids, fresh floating, severity, code Not checked code
01345 Physical Floating debris, severity, code Not checked Floating debris, severity code
01350 Physical Turbidity, severity, code Not checked Turbidity severity code
01351 Physical Streamflow, severity, code Not checked Flow, severity code
01355 Physical Ice cover, floating or solid, severity, code Not checked Ice cover, floating or solid code
30205 Physical Temperature, wood (fire potential), degrees Fahrenheit Agree deg F
30206 Physical Temperature, wood (fire potential), degrees Celsius Agree deg C
30207 Physical Gage height, above datum, meters Agree Gage height m
30208 Physical Discharge, cubic meters per second Agree Mean 1 Day m3/sec
30209 Physical Discharge, instantaneous, cubic meters per second Agree Stream flow, instantaneous m3/sec
30210 Physical Depth to water level, below land surface datum (LSD), meters Agree Depth, from ground surface to well water level m
30211 Physical Elevation above NGVD 1929, meters Agree m
30212 Physical Stage, sonic range determination, feet Agree ft
30213 Physical Stage, sonic range determination, meters Agree m
30214 Physical Pressure, relative, manometer tank, count Agree count
30267 Physical Illumination, lumens per square foot Agree lm/ft2
30334 Physical Surface area, suspended sediment, square meters per gram Agree Suspended Surface area m2/g
32290 Physical Fluorescence transmission (transparency to fluorescence) at 700 nm, percent Not checked %
32291 Physical UV fluorescence, water, in situ, single band, 370 nm excitation, 460 nm emission, relative fluorescence units (RFU) Not checked RFU
32292 Physical UV fluorescence, water, in situ, single band, 270 nm excitation, 340 nm emission, relative fluorescence units (RFU) Not checked RFU
32293 Physical UV fluorescence, water, in situ, single band, 370 nm excitation, 470 nm emission, relative fluorescence units (RFU) Not checked RFU
32294 Physical UV fluorescence, water, in situ, single band, 370 nm excitation, 520 nm emission, relative fluorescence units (RFU) Not checked RFU
32295 Physical Dissolved organic matter fluorescence (fDOM), water, in situ, micrograms per liter as quinine sulfate equivalents (QSE) Not checked Dissolved Colored dissolved organic matter (CDOM) ug/l QSE
32296 Physical Absorbance at 280 nm, water, filtered, absorbance units per centimeter Not checked Dissolved AU/cm
32297 Physical Absorbance at 370 nm, water, filtered, absorbance units per centimeter Not checked Dissolved AU/cm
32298 Physical Absorbance at 412 nm, water, filtered, absorbance units per centimeter Not checked Dissolved AU/cm
32299 Physical Absorbance at 440 nm, water, filtered, absorbance units per centimeter Not checked Dissolved AU/cm
32300 Physical Absorption spectral slope (Sag), wavelengths 275 to 295 nm, unitless Not checked Dissolved None
32301 Physical Absorption spectral slope (Sag), wavelengths 290 to 350 nm, unitless Not checked Dissolved None
32302 Physical Absorption spectral slope (Sag), wavelengths 350 to 400 nm, unitless Not checked Dissolved None
32303 Physical Absorption spectral slope, wavelengths 412 to 676 nm, unitless Not checked Dissolved None
32304 Physical Fluorescence, water, filtered, excitation at 260 nm, emission at 450 nm, Raman units (RU) Not checked Dissolved RU
32305 Physical Fluorescence, water, filtered, excitation at 275 nm, emission at 304 nm, Raman units (RU) Not checked Dissolved RU
32306 Physical Fluorescence, water, filtered, excitation at 340 nm, emission at 440 nm, micrograms per liter of quinine sulfate equivalents (QSE) Not checked Dissolved ug/l QSE
32307 Physical Fluorescence, water, filtered, excitation at 390 nm, emission at 510 nm, Raman units (RU) Not checked Dissolved RU
32308 Physical Fluorescence, water, filtered, excitation at 370 nm, emission at 460 nm, micrograms per liter of quinine sulfate equivalents (QSE) Not checked Dissolved ug/l QSE
32309 Physical Fluorescence, water, filtered, excitation at 300 nm, emission at 390 nm, Raman units (RU) Not checked Dissolved RU
32310 Physical Fluorescence, water, filtered, excitation at 280 nm, emission at 370 nm, Raman units (RU) Not checked Dissolved RU
32311 Physical Fluorescence, water, filtered, excitation at 275 nm, emission at 340 nm, Raman units (RU) Not checked Dissolved RU
32312 Physical Fluorescence Index - ratio of emission intensities which characterizes the slope of the emission curve at an excitation of 370 nm Not checked Dissolved None
32313 Physical Humification Index - calculated by dividing the fluorescence intensity in the 435-480 nm region by the total intensities in the 300-345 and 435-480 nm regions Not checked Dissolved None
32315 Physical Chlorophyll fluorescence (fChl), water, in situ, relative fluorescence units (RFU) Not checked Total 479-61-8 Chlorophyll a RFU
32316 Physical Chlorophyll fluorescence (fChl), water, in situ, micrograms per liter as chlorophyll Not checked Total 479-61-8 Chlorophyll a ug/l
32319 Physical Phycocyanin fluorescence (fPC), water, in situ, micrograms per liter as phycocyanin Not checked Total ug/l
32321 Physical Phycocyanin fluorescence (fPC), water, in situ, relative fluorescence units (RFU) Not checked Total RFU
32322 Physical Dissolved organic matter fluorescence (fDOM), water, in situ, relative fluorescence units (RFU) Not checked Total Colored dissolved organic matter (CDOM) RFU
32323 Physical Phycoerythrin fluorescence (fPE), water, in situ, relative fluorescence units (RFU) Not checked Total RFU
32327 Physical Absorbance at 254 nm, water, in situ, absorbance units Not checked Total UV 254 -- SDWA NPDWR AU
32328 Physical Absorbance at 350 nm, water, in situ, absorbance units Not checked Total AU
32332 Physical Fluorescence, water, filtered, excitation at 340 nm, emission at 440 nm, Raman units (RU) Not checked Dissolved RU
32333 Physical Fluorescence, water, filtered, excitation at 370 nm, emission at 460 nm, Raman units (RU) Not checked Dissolved RU
34777 Physical Exposed bedrock in streambed (fraction of the streambed that is exposed bedrock), percent Agree %
45001 Physical Precipitation, number of days since 0.25 to 0.5 inch precipitation event Agree days
45002 Physical Precipitation, number of days since 0.5 to 1.0 inch precipitation event Agree days
45003 Physical Precipitation, number of days since greater than 1.0 inch precipitation event Agree days
46253 Physical pH, 1 to 1 soil/water mixture, standard units Agree pH, in soil std units
46311 Physical Moisture content, soil, dry weight, percent Agree Dry Total Moisture content %
46514 Physical Solar radiation, upward intensity, calories per square centimeter per minute Agree cal/cm2/mn
46515 Physical Solar radiation, downward intensity, calories per square centimeter per minute Agree cal/cm2/mn
46516 Physical Solar radiation, net, calories per square centimeter per minute Agree cal/cm2/mn
46529 Physical Precipitation, inches Agree Precipitation in
49282 Physical Moisture content, bed sediment smaller than 2 millimeters, wet sieved (native water), field, recoverable, dry weight, percent Not agree Dry < 2 mm Bed Sediment Moisture content %
49491 Physical Moisture content, biota, whole organism, recoverable, wet weight, percent Not agree Wet Recoverable Moisture content %
49701 Physical Transparency, water, in situ, Secchi disc, feet Agree Water transparency, Secchi disc ft
49982 Physical Bulk density, soil, dry, grams per cubic centimeter Not checked Dry Total g/cm3
49983 Physical Mineral density, soil, grams per cubic centimeter Not checked Total g/cm3
49984 Physical Rubbed fiber content, soil, percent Not checked Total %
49985 Physical Marsh level movement, vertical, meters Not checked m
49986 Physical Degree of decomposition, soil, code Not checked Total code
50011 Physical Temperature, vent gas, volcanic, degrees Celsius Agree deg C
50012 Physical Compaction, aquifer system, feet Not checked ft
50013 Physical Compaction, soil, feet Not checked Total ft
50042 Physical Discharge, gallons per minute Agree gal/min
50047 Physical Flow, maximum during 24 hour period, million gallons per day Agree Maximum 24 Hour Flow, maximum during 24-hour period mgd
50048 Physical Flow, minimum during 24 hour period, million gallons per day Agree Minimum 24 Hour mgd
50050 Physical Flow, in conduit or through a treatment plant, million gallons per day Agree Flow, in conduit or treatment plant mgd
50051 Physical Flow rate, instantaneous, million gallons per day Agree Flow rate, instantaneous mgd
50052 Physical Flow total during composite period, thousands of gallons Agree Total Kgal
50054 Physical Storm water overflow volume, millions of gallons Agree Mgal
50086 Physical Settleable solids, water, unfiltered, milliliters per liter per hour Agree Settleable Settleable solids mL/L/hr
50624 Physical Absorbance, 254 nm, water, filtered, absorbance units per centimeter Not agree Dissolved UV 254 -- SDWA NPDWR units/cm
51331 Physical Solids, smaller than 2 mm, wet sieved, dry weight, percent of wet weight Not checked Wet < 2 mm %
51332 Physical Solids, smaller than 0.063 mm, wet sieved, dry weight, percent of wet weight Not checked Wet < 0.063 mm %
51333 Physical Solids, between 0.063 and 0.250 mm, wet sieved, dry weight, percent of wet weight Not checked Wet 0.063-0.25 mm %
51334 Physical Solids, between 0.250 mm and 1 mm, wet sieved, dry weight, percent of wet weight Not checked Wet 0.25-1.0 mm %
51335 Physical Loss on ignition, solids smaller than 2 mm, wet sieved, percent Not checked < 2 mm %
51336 Physical Loss on ignition, solids smaller than 0.063 mm, wet sieved, percent Not checked < 0.063 mm %
51337 Physical Loss on ignition, solids between 0.063 and 0.250 mm, wet sieved, percent Not checked 0.063-0.25 mm %
51338 Physical Loss on ignition, solids between 0.250 mm and 1 mm, wet sieved, percent Not checked 0.25-1.0 mm %
51339 Physical Bulk density, solids smaller than 2 mm, wet sieved, grams per cubic centimeter Not checked < 2 mm g/cm3
51340 Physical Bulk density, solids smaller than 0.063 mm, wet sieved, grams per cubic centimeter Not checked < 0.063 mm g/cm3
51341 Physical Bulk density, solids between 0.063 and 0.250 mm, wet sieved, grams per cubic centimeter Not checked 0.063-0.25 mm g/cm3
51342 Physical Bulk density, solids between 0.250 mm and 1 mm, wet sieved, grams per cubic centimeter Not checked 0.25-1.0 mm g/cm3
51343 Physical Porosity, solids smaller than 2 mm, wet sieved, fraction Not checked < 2 mm fraction
51344 Physical Porosity, solids smaller than 0.063 mm, wet sieved, fraction Not checked < 0.063 mm fraction
51345 Physical Porosity, solids between 0.063 and 0.250 mm, wet sieved, fraction Not checked 0.063-0.25 mm fraction
51346 Physical Porosity, solids between 0.250 mm and 1 mm, wet sieved, fraction Not checked 0.25-1.0 mm fraction
52723 Physical Solids, percent smaller than 0.00038 millimeters Not checked <.00038mm %
52724 Physical Solids, percent smaller than 0.0006 millimeters Not checked <0.0006mm %
52725 Physical Solids, percent smaller than 0.0007 millimeters Not checked <0.0007mm %
52726 Physical Solids, percent smaller than 0.0008 millimeters Not checked <0.0008mm %
52727 Physical Solids, percent smaller than 0.0012 millimeters Not checked <0.0012mm %
52728 Physical Solids, percent smaller than 0.0014 millimeters Not checked <0.0014mm %
52729 Physical Solids, percent smaller than 0.0016 millimeters Not checked <0.0016mm %
52730 Physical Solids, percent smaller than 0.0023 millimeters Not checked <0.0023mm %
52731 Physical Solids, percent smaller than 0.0028 millimeters Not checked <0.0028mm %
52732 Physical Solids, percent smaller than 0.0033 millimeters Not checked <0.0033mm %
52733 Physical Solids, percent smaller than 0.005 millimeters Not checked <0.005 mm %
52734 Physical Solids, percent smaller than 0.006 millimeters Not checked <0.006 mm %
52735 Physical Solids, percent smaller than 0.007 millimeters Not checked <0.007 mm %
52736 Physical Solids, percent smaller than 0.009 millimeters Not checked <0.009 mm %
52737 Physical Solids, percent smaller than 0.011 millimeters Not checked <0.011 mm %
52738 Physical Solids, percent smaller than 0.013 millimeters Not checked <0.013 mm %
52739 Physical Solids, percent smaller than 0.019 millimeters Not checked <0.019 mm %
52740 Physical Solids, percent smaller than 0.022 millimeters Not checked <0.022 mm %
52741 Physical Solids, percent smaller than 0.026 millimeters Not checked <0.026 mm %
52742 Physical Solids, percent smaller than 0.037 millimeters Not checked <0.037 mm %
52743 Physical Solids, percent smaller than 0.044 millimeters Not checked <0.044 mm %
52744 Physical Solids, percent smaller than 0.053 millimeters Not checked <0.053 mm %
52745 Physical Solids, percent smaller than 0.074 millimeters Not checked <0.074 mm %
52746 Physical Solids, percent smaller than 0.088 millimeters Not checked <0.088 mm %
52747 Physical Solids, percent smaller than 0.105 millimeters Not checked <0.105 mm %
52748 Physical Solids, percent smaller than 0.149 millimeters Not checked <0.149 mm %
52749 Physical Solids, percent smaller than 0.177 millimeters Not checked <0.177 mm %
52750 Physical Solids, percent smaller than 0.210 millimeters Not checked <0.210 mm %
52751 Physical Solids, percent smaller than 0.297 millimeters Not checked <0.297 mm %
52752 Physical Solids, percent smaller than 0.354 millimeters Not checked <0.354 mm %
52753 Physical Solids, percent smaller than 0.420 millimeters Not checked <0.420 mm %
52754 Physical Solids, percent smaller than 0.595 millimeters Not checked <0.595 mm %
52755 Physical Solids, percent smaller than 0.707 millimeters Not checked <0.707 mm %
52756 Physical Solids, percent smaller than 0.841 millimeters Not checked <0.841 mm %
52757 Physical Solids, percent smaller than 1.189 millimeters Not checked <1.189 mm %
52758 Physical Solids, percent smaller than 1.414 millimeters Not checked <1.414 mm %
52759 Physical Solids, percent smaller than 1.682 millimeters Not checked <1.682 mm %
52887 Physical Air-equilibrated pH, water, unfiltered, purged, standard units Not checked Total std units
52901 Physical Fluorescence, water, filtered, excitation at 340 nm, emission at 440 nm, Raman units (RU) Not checked Dissolved RU
52902 Physical Fluorescence, water, filtered, excitation at 370 nm, emission at 460 nm, Raman units (RU) Not checked Dissolved RU
53048 Physical Transparency, water, unfiltered, field, measured using a Secchi tube, centimeters Not checked Total cm
53049 Physical Transparency, water, unfiltered, field, measured using a Secchi tube, inches Not checked Total in
61028 Physical Turbidity, water, unfiltered, field, nephelometric turbidity units Agree Total Turbidity NTU
61032 Physical Carbonaceous biochemical oxygen demand, water, filtered, nitrogen inhibited, 20 days at 20 degrees Celsius, milligrams per liter Agree 20 Day Dissolved 20 deg C Carbonaceous biochemical oxygen demand, non-standard conditions mg/l
61168 Physical Carbonaceous biochemical oxygen demand, water, unfiltered, nitrogen inhibited, 20 days at 20 degrees Celsius, milligrams per liter Agree 20 Day Total 20 deg C Carbonaceous biochemical oxygen demand, non-standard conditions mg/l
61726 Physical Absorbance, UV, organic constituents, 280 nm, 1 cm path length, water, filtered, absorbance units per centimeter Agree Dissolved units/cm
61727 Physical Wind gust speed, air, knots Agree knots
61728 Physical Wind gust speed, air, miles per hour Agree mph
61729 Physical Wind gust direction, air, degrees clockwise from true north Agree Deg
61920 Physical Temperature, bed sediment, degrees Celsius Not checked Bed Sediment deg C
62600 Physical Water level elevation above NGVD 1929, corrected for barometric pressure, feet USGS use and no use by EPA ft
62601 Physical Water level elevation above NGVD 1929, inclined (non-vertical) well, feet USGS use and no use by EPA ft
62602 Physical Barometric pressure, corrected to sea level, inches of mercury USGS use and no use by EPA Barometric pressure in/Hg
62603 Physical Barometric pressure, uncorrected, inches of mercury USGS use and no use by EPA Barometric pressure in/Hg
62604 Physical Barometric pressure, corrected to sea level, inches of water USGS use and no use by EPA Barometric pressure in/H2O
62605 Physical Barometric pressure, uncorrected, inches of water USGS use and no use by EPA Barometric pressure in/H2O
62606 Physical Barometric pressure, corrected to sea level, kilopascals USGS use and no use by EPA Barometric pressure kPa
62607 Physical Barometric pressure, uncorrected, kilopascals USGS use and no use by EPA Barometric pressure kPa
62608 Physical Total solar radiation (direct + diffuse radiation on a horizontal surface), watts per square meter USGS use and no use by EPA Total W/m2
62609 Physical Net solar radiation, watts per square meter USGS use and no use by EPA W/m2
62610 Physical Groundwater level above NGVD 1929, feet USGS use and no use by EPA ft
62611 Physical Groundwater level above NAVD 1988, feet USGS use and no use by EPA ft
62612 Physical Groundwater level above NGVD 1929, meters USGS use and no use by EPA m
62613 Physical Groundwater level above NAVD 1988, meters USGS use and no use by EPA m
62614 Physical Lake or reservoir water surface elevation above NGVD 1929, feet USGS use and no use by EPA ft
62615 Physical Lake or reservoir water surface elevation above NAVD 1988, feet USGS use and no use by EPA ft
62616 Physical Lake or reservoir water surface elevation above NGVD 1929, meters USGS use and no use by EPA m
62617 Physical Lake or reservoir water surface elevation above NAVD 1988, meters USGS use and no use by EPA m
62618 Physical Lake or reservoir stage, above datum, meters USGS use and no use by EPA m
62619 Physical Estuary or ocean water surface elevation above NGVD 1929, feet USGS use and no use by EPA ft
62620 Physical Estuary or ocean water surface elevation above NAVD 1988, feet USGS use and no use by EPA ft
62621 Physical Estuary or ocean water surface elevation above NGVD 1929, meters USGS use and no use by EPA m
62622 Physical Estuary or ocean water surface elevation above NAVD 1988, meters USGS use and no use by EPA m
62623 Physical Tide stage, above datum, feet USGS use and no use by EPA Tide stage ft
62624 Physical Tide stage, above datum, meters USGS use and no use by EPA Tide stage m
62625 Physical Wind speed, meters per second USGS use and no use by EPA Wind velocity m/sec
62846 Physical Temperature, soil, degrees Fahrenheit USGS use and no use by EPA deg F
62856 Physical Discharge, peak for storm event, cubic feet per second USGS use and no use by EPA Maximum 1 Day ft3/s
62923 Physical Solids, percent smaller than 0.0005 millimeters USGS use and no use by EPA < 0.0005 mm %
62924 Physical Solids, percent smaller than 0.001 millimeters USGS use and no use by EPA < 0.001 mm %
62925 Physical Solids, percent smaller than 0.002 millimeters USGS use and no use by EPA < 0.002 mm %
62926 Physical Solids, percent smaller than 0.004 millimeters USGS use and no use by EPA < 0.004 mm %
62927 Physical Solids, percent smaller than 0.008 millimeters USGS use and no use by EPA < 0.008 mm %
62928 Physical Solids, percent smaller than 0.016 millimeters USGS use and no use by EPA < 0.016 mm %
62929 Physical Solids, percent smaller than 0.031 millimeters USGS use and no use by EPA < 0.031 mm %
62930 Physical Solids, percent smaller than 0.05 millimeters USGS use and no use by EPA < 0.05 mm %
62931 Physical Solids, percent smaller than 0.0625 millimeters USGS use and no use by EPA < 0.0625 mm %
62932 Physical Solids, percent smaller than 0.1 millimeters USGS use and no use by EPA < 0.1 mm %
62933 Physical Solids, percent smaller than 0.125 millimeters USGS use and no use by EPA < 0.125 mm %
62934 Physical Solids, percent smaller than 0.25 millimeters USGS use and no use by EPA < 0.25 mm %
62935 Physical Solids, percent smaller than 0.5 millimeters USGS use and no use by EPA < 0.5 mm %
62936 Physical Solids, percent smaller than 1 millimeters USGS use and no use by EPA < 1 mm %
62937 Physical Solids, percent smaller than 2 millimeters USGS use and no use by EPA < 2 mm %
62938 Physical Solids, percent smaller than 4 millimeters USGS use and no use by EPA < 4 mm %
62939 Physical Solids, percent smaller than 8 millimeters USGS use and no use by EPA < 8 mm %
62940 Physical Solids, percent smaller than 16 millimeters USGS use and no use by EPA < 16 mm %
62941 Physical Solids, percent smaller than 32 millimeters USGS use and no use by EPA < 32 mm %
62942 Physical Solids, percent smaller than 64 millimeters USGS use and no use by EPA < 64 mm %
62943 Physical Solids, percent smaller than 128 millimeters USGS use and no use by EPA < 128 mm %
62947 Physical Bulk density, solids, grams per cubic centimeter USGS use and no use by EPA g/cm3
62948 Physical Moisture content, solids, gravimetric, dry weight, grams of water per gram of dry solids USGS use and no use by EPA Dry Moisture content g H2O/g
62949 Physical Moisture content, solids, volumetric, percent of total volume USGS use and no use by EPA Total Moisture content %
62966 Physical Temperature, plant surface, degrees Celsius USGS use and no use by EPA deg C
62967 Physical Soil-heat flux, watts per square meter USGS use and no use by EPA W/m2
62968 Physical Latent-heat flux, watts per square meter USGS use and no use by EPA W/m2
62969 Physical Sensible-heat flux, watts per square meter USGS use and no use by EPA W/m2
62970 Physical Water vapor pressure, megapascals USGS use and no use by EPA Vapor MPa
63001 Physical Oxidation reduction potential, raw emf, reference electrode not specified, millivolts USGS use and no use by EPA Oxidation reduction potential (ORP) mV
63002 Physical Oxidation reduction potential, relative to the standard hydrogen electrode (SHE), millivolts USGS use and no use by EPA Oxidation reduction potential (ORP) mV
63158 Physical Stream water level elevation above NGVD 1929, in feet USGS use and no use by EPA ft
63159 Physical Stream water level elevation above NGVD 1929, in meters USGS use and no use by EPA m
63160 Physical Stream water level elevation above NAVD 1988, in feet USGS use and no use by EPA ft
63161 Physical Stream water level elevation above NAVD 1988, in meters USGS use and no use by EPA m
63675 Physical Turbidity, water, unfiltered, broad band light source (400-680 nm), detection angle 90 +-30 degrees to incident light, nephelometric turbidity units (NTU) USGS use and no use by EPA Total Turbidity NTU
63676 Physical Turbidity, water, unfiltered, broad band light source (400-680 nm), detectors at multiple angles including 90 +-30 degrees, ratiometric correction, NTRU USGS use and no use by EPA Total NTRU
63677 Physical Backscatter turbidity, water, unfiltered, broad band light source (400-680 nm), detection angle 0-45 degrees to incident light, backscatter units (BU) USGS use and no use by EPA Total BU
63678 Physical Attenuation turbidity, water, unfiltered, broad band light source (400-680 nm), detection angle 180 degrees to incident light, attenuation units (AU) USGS use and no use by EPA Total AU
63679 Physical Turbidity, water, unfiltered, broad band light source (400-680 nm), multiple beam, detectors at multiple angles including 90 degrees, NTMU USGS use and no use by EPA Total NTMU
63680 Physical Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU) USGS use and no use by EPA Total Turbidity FNU
63681 Physical Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detectors at multiple angles including 90 +-2.5 degrees, ratiometric correction, FNRU USGS use and no use by EPA Total FNRU
63682 Physical Turbidity, water, unfiltered, monochrome near infra-red LED light source, 780-900 nm, detection angle 0-45 degrees to incident light (backscatter), FBU USGS use and no use by EPA Total FBU
63683 Physical Turbidity, water, unfiltered, monochrome near infra-red LED light source, 780-900 nm, detection angle 180 degrees to incident light (attenuation), FAU USGS use and no use by EPA Total FAU
63684 Physical Turbidity, water, unfiltered, monochrome near infra-red LED light source, 780-900 nm, multiple beam, detectors at multiple angles including 90 degrees, FNMU USGS use and no use by EPA Total FNMU
63740 Physical Loss on ignition, solids, percent USGS use and no use by EPA %
64094 Physical Fluorescence at 650-700 nm as a fraction of incident light at 470 nm, measured in situ, percent USGS use and no use by EPA %
64466 Physical Total suspended particles (TSP) in air, micrograms per cubic meter USGS use and no use by EPA Suspended ug/m3
65225 Physical Transparency, water, unfiltered, transparency tube, centimeters USGS use and no use by EPA Total Water transparency, tube with disk cm
65237 Physical Oxygen-consumption rate, bed sediment, milligrams of oxygen per gram of sediment (dry weight) per hour USGS use and no use by EPA Dry Bed Sediment mg O2/g/hr
66700 Physical Absorbance, UV, organic constituents, 412 nm, 1 cm path length, water, filtered, units per centimeter USGS use and no use by EPA Dissolved AU/cm
66702 Physical Chemical oxygen demand, solids, total, dry weight, milligrams per liter USGS use and no use by EPA Dry Total Chemical oxygen demand mg/l
68921 Physical pH, soil, in deionized water, standard units USGS use and no use by EPA pH std units
68922 Physical pH, soil, in 0.01 M calcium chloride, standard units USGS use and no use by EPA pH std units
68923 Physical Loss on ignition, soil, dry, heated to 450C, percent USGS use and no use by EPA Dry 450 deg C %
70224 Physical Wave height, nearshore, feet Not checked Wave height ft
70227 Physical Direction of stream flow, magnetic azimuth, degrees Agree Deg
70292 Physical Suspended solids, evaporation by vacuum desiccation at room temperature, water, milligrams per liter Not checked Dry Suspended Room temp mg/l
70293 Physical Suspended solids, dried at 105 degrees Celsius, water, milligrams per liter Not checked Dry Suspended 105 deg C Total suspended solids mg/l
70299 Physical Suspended solids dried at 110 degrees Celsius, water, unfiltered, milligrams per liter Not agree Suspended 110 deg C Total suspended solids mg/l
70300 Physical Dissolved solids dried at 180 degrees Celsius, water, filtered, milligrams per liter Not checked Dissolved 180 deg C Total dissolved solids mg/l
70301 Physical Dissolved solids, water, filtered, sum of constituents, milligrams per liter Not checked Dissolved Total dissolved solids mg/l
70302 Physical Dissolved solids, water, short tons per day Not checked Dissolved Total dissolved solids tons/day
70303 Physical Dissolved solids, water, filtered, short tons per acre-foot Not checked Dissolved Total dissolved solids tons/ac ft
70305 Physical Salinity, water, grams per liter Agree Dissolved Salinity g/l
70310 Physical pH, bed sediment, standard units Agree Bed Sediment pH std units
70320 Physical Moisture content, fraction of wet weight, percent Agree Wet Moisture content %
70348 Physical Settleable solids, water, unfiltered, milliliters per liter Agree Settleable Settleable solids ml/l
70349 Physical Non-settleable solids, water, unfiltered, milliliters per liter Not checked Non-settleable Non-settleable solids ml/l
70516 Physical Color, absorbance at 400 nm, water, filtered, absorbance units per centimeter USGS use and no use by EPA Dissolved Color AU/cm
70971 Physical Light attenuation coefficient, alphas per meter Agree alpha/m
71820 Physical Density of water sample, unfiltered, grams per milliliter at 20 degrees Celsius Not checked Total 20 deg C Density of water at 20 deg C g/mL @ 20C
71835 Physical Oxygen consumed, water, filtered, milligrams per liter Agree Dissolved mg/l
71840 Physical Oxygen consumed, water, unfiltered, milligrams per liter Agree Total mg/l
71860 Physical Sodium carbonate, residual, water, unfiltered, milligrams per liter as calcium carbonate Not checked Total 497-19-8 Sodium carbonate mg/l CaCO3
72001 Physical Depth of hole, feet below land surface datum Agree Depth ft
72002 Physical Depth to top of water-bearing zone, feet Agree ft
72003 Physical Depth to bottom of water-bearing zone, feet Agree ft
72008 Physical Depth of well, feet below land surface datum Agree Depth ft
72010 Physical Fluid resistivity, ohm-meter(s) Agree ohm-meters
72012 Physical Temperature, specific gravity measurement, degrees Celsius Agree deg C
72013 Physical Specific gravity Agree Specific gravity None
72014 Physical Temperature, resistivity measurement, degrees Celsius Agree deg C
72015 Physical Depth to top of sample interval, feet below land surface datum Agree ft
72016 Physical Depth to bottom of sample interval, feet below land surface datum Agree ft
72019 Physical Depth to water level, feet below land surface Agree Depth to water level below land surface ft
72020 Physical Elevation above NGVD 1929, feet Not checked ft
72021 Physical Reservoir storage, cubic feet per second-days Agree Mean 1 Day Reservoir storage cfs-days
72022 Physical Reservoir storage, million gallons Agree Reservoir storage Mgal
72024 Physical Pond storage, gallons Agree gal
72025 Physical Depth of reservoir, feet Agree Depth of pond or reservoir in feet ft
72040 Physical Drawdown observed, feet Agree ft
72106 Physical Elevation of sample, feet Agree ft
72122 Physical Discharge, median for storm event, cubic feet per second USGS use and no use by EPA Median 1 Day ft3/s
72123 Physical Discharge, mean for storm event, cubic feet per second USGS use and no use by EPA Mean 1 Day ft3/s
72124 Physical Net radiation (net solar + net long wave radiation), watts per square meter USGS use and no use by EPA W/m2
72125 Physical Atmospheric water vapor pressure, calculated, kilopascals USGS use and no use by EPA Vapor kPa
72127 Physical Atmospheric saturated water vapor pressure, calculated, kilopascals USGS use and no use by EPA Vapor kPa
72128 Physical Potential latent heat flux, calculated by Penman method, watts per square meter USGS use and no use by EPA W/m2
72129 Physical Potential evapotranspiration (PET), calculated by Priestley-Taylor method, millimeters per hour USGS use and no use by EPA mm/hr
72130 Physical Potential evapotranspiration (PET), calculated by Penman method, millimeters per hour USGS use and no use by EPA mm/hr
72131 Physical Precipitation, millimeters per hour USGS use and no use by EPA Precipitation mm/hr
72132 Physical Soil heat flux at soil surface, calculated, watts per square meter USGS use and no use by EPA W/m2
72133 Physical Soil water matric potential, negative bars USGS use and no use by EPA neg bar
72134 Physical Change in heat flux density between 8 centimeter soil depth and the surface, calculated, watts per square meter USGS use and no use by EPA W/m2
72135 Physical Evapotranspiration total, inches per day USGS use and no use by EPA Total inches/day
72136 Physical Hydrostatic head difference, groundwater minus surface water, millimeters USGS use and no use by EPA mm
72137 Physical Discharge, tidally filtered, cubic feet per second USGS use and no use by EPA Mean 1 Day Dissolved ft3/s
72138 Physical Discharge, tidally filtered, cubic meters per second USGS use and no use by EPA Mean 1 Day Dissolved m3/sec
72139 Physical Discharge, tidally filtered, gallons per minute USGS use and no use by EPA Dissolved gal/min
72149 Physical Stream velocity, meters per second USGS use and no use by EPA Stream velocity m/sec
72150 Physical Groundwater level relative to Mean Sea Level (MSL), feet USGS use and no use by EPA ft
72151 Physical Water column pressure, pounds per square inch USGS use and no use by EPA psi
72159 Physical Evapotranspiration, millimeters per day USGS use and no use by EPA mm/d
72164 Physical Barometric pressure (BP), uncorrected, feet of water USGS use and no use by EPA ft of H2O
72167 Physical Matric potential or pressure head, centimeters USGS use and no use by EPA cm
72168 Physical Stream velocity, tidally filtered, feet per second USGS use and no use by EPA ft/sec
72169 Physical Stream velocity, tidally filtered, meters per second USGS use and no use by EPA m/s
72170 Physical Stage, tidally filtered, above datum, feet USGS use and no use by EPA ft
72171 Physical Stage, tidally filtered, above datum, meters USGS use and no use by EPA meters
72172 Physical Wave height, Fourier transformation, feet Not checked ft
72173 Physical Wave period, Fourier transformation, seconds Not checked seconds
72174 Physical Longwave radiation, upward intensity, watts per square meter Not checked W/m2
72175 Physical Longwave radiation, downward intensity, watts per square meter Not checked W/m2
72177 Physical Groundwater discharge, centimeters per day Not checked cm/d
72178 Physical Water depth, water surface to bottom, meters Not checked meters
72179 Physical Shortwave solar radiation, watts per square meter Not checked W/m2
72180 Physical Evapotranspiration, inches Not checked inches
72181 Physical Moisture content, soil, volumetric, fraction of total volume Not checked number
72182 Physical Atmospheric water vapor density, grams per cubic meter Not checked g/m3
72183 Physical Inflow, gallons per day Not checked gal/day
72184 Physical Visible radiation (average flux density), microeinsteins per second per square meter Not checked uE/m2/sec
72185 Physical Shortwave radiation, upward intensity, watts per square meter Not checked W/m2
72186 Physical Shortwave radiation, downward intensity, watts per square meter Not checked W/m2
72187 Physical Transparency, water, in situ, Secchi disc observed with viewscope, inches Not checked in
72188 Physical Turbidity, water, unfiltered, field, broad band light source (400-680 nm), detectors at multiple angles including 90 +-30 degrees, ratiometric correction, nephelometric Not checked NTRU
72189 Physical Snow depth, meters Not checked Depth, snow cover m
72190 Physical Velocity at point in stream, meters per second Not checked m/sec
72192 Physical Precipitation, cumulative, inches Not checked Precipitation in
72193 Physical Net radiation (net solar + net long wave radiation), upward intensity, watts per square meter Not checked W/m2
72194 Physical Precipitation, cumulative, millimeters Not checked Precipitation mm
72198 Physical Snow depth, feet Not checked ft
72199 Physical Water depth, water surface to bottom, feet Not checked Depth of water column ft
72200 Physical Evaporation per recording interval, millimeters Not checked mm
72201 Physical Net incident shortwave radiation, watts per square meter Not checked W/m2
72202 Physical Net emitted longwave radiation, watts per square meter Not checked W/m2
72204 Physical Barometric pressure (BP), uncorrected, pounds per square inch Not checked psi
72205 Physical Bulk electrical conductance, soil, decisiemens per meter Not checked Total dS/m
72206 Physical Sublimation from snowpack per recording interval, millimeters Not checked mm
72207 Physical Albedo (ratio of reflected to total incoming solar radiation), ratio Not checked None
72208 Physical Turbidity, water, unfiltered, mid-depth of water column, broad band light source (400-680 nm), detection angle 90 +-30 degrees to incident light, nephelometric turbidity Not checked Total NTU
72209 Physical Turbidity, water, unfiltered, mid-depth of water column, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units Not checked Total Turbidity FNU
72211 Physical Density of water sample, deionized and deaired, at specific gravity test-temperature, grams per cubic centimeter Not checked Total g/cm3
72212 Physical Porosity, soil or solids, fraction Not checked None
72213 Physical Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detector angles at 90 +-2.5 degrees and 0-45 degrees, ratiometric, FBRU Not checked Total FBRU
72214 Physical Lake or reservoir elevation above International Great Lakes Datum (IGLD), feet Not checked ft
72215 Physical Lake or reservoir elevation above International Great Lakes Datum (IGLD), meters Not checked m
72216 Physical Location of salt front in river miles upstream from mouth, miles Not checked mi
72223 Physical Soil water matric potential, bars Not checked bar
72224 Physical Extinction reference absorbance, absorbance units per centimeter Not checked AU/cm
72225 Physical Extinction measurement absorbance, absorbance units per centimeter Not checked AU/cm
72226 Physical Groundwater level above American Samoa Datum of 1962 (retired in 2001), feet Not checked ft
72227 Physical Groundwater level above American Samoa Vertical Datum of 2002, feet Not checked ft
72228 Physical Groundwater level above Guam Vertical Datum of 1963 (retired in 2003), feet Not checked ft
72229 Physical Groundwater level above Guam Vertical Datum of 2004, feet Not checked ft
72230 Physical Groundwater level above Local Hawaiian Datum, feet Not checked ft
72231 Physical Groundwater level above Northern Marianas Vertical Datum of 2003, feet Not checked ft
72232 Physical Groundwater level above Puerto Rico Datum of 2002, feet Not checked ft
72241 Physical Absolute pressure from unvented pressure transducer, millimeters of mercury Not checked mm/Hg
72242 Physical Tree sap flow, grams of sap per hour Not checked g/hr
72243 Physical Discharge, cubic feet per day Not checked ft3/day
72250 Physical Marsh mat (floating vegetation) elevation above NAVD 1988, feet Not checked ft
72251 Physical Water level above marsh, feet Not checked ft
72252 Physical Solar radiation (average flux density on a horizontal surface during measurement interval), kilowatts per square meter Not checked kW/m2
72253 Physical Soil temperature, degrees Celsius Not checked deg C
72263 Physical Density of water sample, unfiltered, in grams per cubic centimeter at 20 degrees Celsius Not checked Total 20 deg C g/cm3
72264 Physical Lake or reservoir elevation above New York State Barge Canal Datum (NYBCD), feet Not checked ft
72265 Physical Lake or reservoir elevation above New York State Barge Canal Datum (NYBCD), meters Not checked m
72266 Physical Refractive index of fluid (real value) for laser diffraction diameter measurement Not checked None
72267 Physical Refractive index of sample material (real value part) for laser diffraction diameter measurement Not checked None
72268 Physical Refractive index of sample material (imaginary value part) for laser diffraction diameter measurement Not checked None
72269 Physical Wind gust speed, air, meters per second Not checked m/sec
72270 Physical Volume of water, total during measurement interval, liters Not checked l
72272 Physical Discharge, cumulative, acre-feet Not checked ac-ft
72274 Physical Scour hole bottom elevation above NGVD 1929, feet Not checked ft
72275 Physical Lake or reservoir elevation above United States Bureau of Reclamation Klamath Basin (USBRKB) Datum, feet Not checked ft
72276 Physical Tidal water level, NOS-averaged, distance from measuring point to water surface, feet Not checked ft
72279 Physical Tidal elevation, NOS-averaged, NAVD88, feet Not checked ft
72284 Physical Mean wave height, meters Not checked m
72285 Physical Mean wave period, seconds Not checked seconds
72286 Physical Significant wave height, meters Not checked m
72287 Physical Significant wave period, seconds Not checked seconds
72288 Physical Maximum wave height, meters Not checked m
72289 Physical Mean wave direction, degrees Not checked Deg
72290 Physical Peak wave direction, degrees Not checked Deg
72291 Physical Precipitation, intensity at given time, inches per minute Not checked in/min
72292 Physical Water level elevation above NAVD 1988, corrected for barometric pressure, feet Not checked ft
72293 Physical Water level elevation above gage datum, corrected for barometric pressure, feet Not checked ft
72294 Physical Mean water velocity for discharge computation, miles per hour Not checked mph
72321 Physical Stream velocity, miles per hour Not checked mph
72322 Physical Surface velocity at point in stream, feet per second Not checked ft/sec
72323 Physical Surface velocity at point in stream, meters per second Not checked m/sec
72324 Physical Radar amplitude, dimensionless Not checked none
72325 Physical Radar signal to noise quality assurance parameter, decibels Not checked dB
72326 Physical Opposite direction content quality assurance parameter, percent Not checked %
74019 Physical Flashpoint of potentially organically contaminated water, degrees Fahrenheit Not checked deg F
74072 Physical Flow rate, liters per second Agree l/sec
74082 Physical Streamflow, daily, acre-feet Agree Daily ac-ft
74207 Physical Moisture content, soil, volumetric, percent of total volume Agree Total Moisture content %
75969 Physical Barometric pressure, not corrected to sea level, millibars Agree Barometric pressure mbar
80082 Physical Carbonaceous biochemical oxygen demand, water, unfiltered, 5 days at 20 degrees Celsius, milligrams per liter Not checked 5 Day Total 20 deg C Carbonaceous biochemical oxygen demand, standard conditions mg/l
80083 Physical Carbonaceous biochemical oxygen demand, water, unfiltered, 7 days at 20 degrees Celsius, milligrams per liter Not checked 7 Day Total 20 deg C Carbonaceous biochemical oxygen demand, non-standard conditions mg/l
80087 Physical Carbonaceous biochemical oxygen demand, water, unfiltered, 20 days at 20 degrees Celsius, milligrams per liter Not checked 20 Day Total 20 deg C Carbonaceous biochemical oxygen demand, non-standard conditions mg/l
80110 Physical Specific gravity at 4 degrees Celsius, water, unfiltered, ratio Agree Total 4 deg C None
81026 Physical Water content of snow, inches Agree Water content of snow in
81027 Physical Temperature, soil, degrees Celsius Agree Total Temperature, soil deg C
81029 Physical Temperature, snow, degrees Celsius Agree deg C
81356 Physical Cation exchange capacity, milliequivalents per 100 grams Agree Cation exchange capacity meq/100 g
81380 Physical Discharge velocity, meters per second Agree Velocity-discharge m/sec
81381 Physical Discharge duration, minutes Agree minutes
81395 Physical Storm water flow, million gallons per day Agree Storm water flow mgd
81798 Physical Precipitation event, inches per composite Agree Precipitation in
81903 Physical Depth to bottom at sample location, feet Agree Depth ft
81904 Physical Velocity at point in stream, feet per second Agree Velocity - stream ft/sec
81912 Physical Open pressure, pounds per square inch Agree psi
81914 Physical Initial flowing pressure, pounds per square inch Agree psi
81915 Physical Final flowing pressure, pounds per square inch Agree psi
81916 Physical Pressure at bottom of hole, pounds per square inch Agree psi
81917 Physical Temperature at bottom of hole, degrees Fahrenheit Agree deg F
82015 Physical Mean depth of lake, feet Agree Mean Depth ft
82016 Physical Maximum depth of lake, feet Agree Maximum Depth ft
82047 Physical Depth to top of sampling interval, meters Agree m
82048 Physical Depth to bottom of sampling interval, meters Agree m
82049 Physical Deoxygenation constant (k1 to base 10), carbonaceous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, per day Not checked Total 20 deg C 20C/day
82050 Physical Reoxygenation constant (k2 to base 10), carbonaceous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, per day Not checked Total 20 deg C 20C/day
82079 Physical Turbidity, water, unfiltered, laboratory, nephelometric turbidity units Agree Total Turbidity NTU
82127 Physical Wind speed, knots Agree Wind velocity knots
82130 Physical Ice thickness, feet Agree Ice thickness ft
82131 Physical Ice thickness, meters Agree Ice thickness m
82132 Physical Deoxygenation constant (k1 to base e), nitrogenous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, per day Not checked Total 20 deg C 20C/day
82133 Physical Deoxygenation constant (k1 to base e), carbonaceous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, per day Not checked Total 20 deg C 20C/day
82134 Physical Deoxygenation constant (k1 to base 10), nitrogenous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, per day Not checked Total 20 deg C 20C/day
82135 Physical Reaction lag time, carbonaceous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, days Not checked Total 20 deg C days
82136 Physical Reaction lag time, nitrogenous biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, days Not checked Total 20 deg C days
82137 Physical Reaction lag time, biochemical oxygen demand, water, unfiltered, 20 degrees Celsius, days Not checked Total 20 deg C days
82259 Physical Street debris smaller than 0.031 millimeters, sieve diameter, percent Agree < 0.031 mm %
82260 Physical Street debris smaller than 0.0625, millimeters, sieve diameter, percent Agree < 0.0625 mm %
82261 Physical Street debris smaller than 0.125 millimeters, sieve diameter, percent Agree < 0.125 mm %
82262 Physical Street debris smaller than 0.25 millimeters, sieve diameter, percent Agree < 0.25 mm %
82263 Physical Street debris smaller than 0.5 millimeters, sieve diameter, percent Agree < 0.5 mm %
82264 Physical Street debris smaller than 1 millimeter, sieve diameter, percent Agree < 1 mm %
82265 Physical Street debris smaller than 2 millimeters, sieve diameter, percent Agree < 2 mm %
82266 Physical Street debris smaller than 4 millimeters, sieve diameter, percent Agree < 4 mm %
82285 Physical Rate of dry deposition, milligrams per square meter per day Agree mg/m2/day
82286 Physical Solids in rainfall, dry weight, milligrams per liter Agree Dry mg/l
82300 Physical Snow depth, inches Agree Depth, snow cover in
82363 Physical Dry deposition, milligrams per square meter Agree mg/m2
82371 Physical Precipitation within 3 days before sample collection, inches Agree 3 Day Precipitation in
82372 Physical Precipitation within 14 days before sample collection, inches Agree 14 Day Precipitation in
82375 Physical Solids, total, accumulation rate, dry weight, grams per square meter per day Agree Dry Total Total solids g/m2/day
82379 Physical Street solids load removed by sweeping, pounds per curb-mile Agree lb/curb-mi
82380 Physical Street solids total dry weight, pounds per curb-mile Agree Dry Total lb/curb-mi
82381 Physical Precipitation total, inches per storm Agree Total Precipitation in
82463 Physical Total solids dried at 105 degrees Celsius, dry atmospheric deposition, milligrams per kilogram Not checked Total 105 deg C Total solids mg/kg
82464 Physical Insoluble solids dried at 105 degrees Celsius, dry atmospheric deposition, milligrams per kilogram Not checked 105 deg C mg/kg
82465 Physical Soluble solids dried at 105 degrees Celsius, dry atmospheric deposition, milligrams per kilogram Not checked 105 deg C mg/kg
82466 Physical Total solids, dry atmospheric deposition, sum of constituents, milligrams per kilogram Agree Total Total solids mg/kg
82467 Physical Insoluble solids, dry atmospheric deposition, sum of constituents, milligrams per kilogram Agree mg/kg
82468 Physical Soluble solids, dry atmospheric deposition, sum of constituents, milligrams per kilogram Agree mg/kg
82550 Physical Osmotic pressure, water, unfiltered, milliosmoles per kilogram Agree Total Osmotic pressure mosm/kg
82583 Physical pH, soil, standard units Agree Total pH std units
82903 Physical Depth to bottom from water surface, at sampling location, meters Agree Depth m
82923 Physical Atmospheric deposition type, wet, code Agree code
83104 Physical pH, wet atmospheric deposition, unfiltered, calculated, standard units Agree Total pH std units
83106 Physical pH, wet atmospheric deposition, unfiltered, field, standard units Agree Total pH std units
83107 Physical pH, wet atmospheric deposition, unfiltered, lab, standard units Agree Total pH std units
83150 Physical Specific conductance, wet atmospheric deposition, filtered, calculated, microsiemens per centimeter at 25 degrees Celsius Agree Dissolved 25 deg C Specific conductance uS/cm @25C
83151 Physical Specific conductance, wet atmospheric deposition, unfiltered, calculated, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
83153 Physical Specific conductance, wet atmospheric deposition, filtered, field, microsiemens per centimeter at 25 degrees Celsius Agree Dissolved 25 deg C Specific conductance uS/cm @25C
83154 Physical Specific conductance, wet atmospheric deposition, unfiltered, field, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
83155 Physical Specific conductance, wet atmospheric deposition, filtered, laboratory, microsiemens per centimeter at 25 degrees Celsius Agree Dissolved 25 deg C Specific conductance uS/cm @25C
83156 Physical Specific conductance, wet atmospheric deposition, unfiltered, laboratory, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
83177 Physical Atmospheric deposition, wet, liters Agree Atmospheric deposition, wet fall l
83205 Physical Atmospheric deposition type, bulk, code Agree code
83386 Physical pH, bulk atmospheric deposition, unfiltered, calculated, standard units Agree Total pH std units
83388 Physical pH, bulk atmospheric deposition, unfiltered, field, standard units Agree Total pH std units
83389 Physical pH, bulk atmospheric deposition, unfiltered, laboratory, standard units Agree Total pH std units
83432 Physical Specific conductance, bulk atmospheric deposition, filtered, calculated, microsiemens per centimeter at 25 degrees Celsius Agree Dissolved 25 deg C Specific conductance uS/cm @25C
83433 Physical Specific conductance, bulk atmospheric deposition, unfiltered, calculated, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
83435 Physical Specific conductance, bulk atmospheric deposition, filtered, field, microsiemens per centimeter at 25 degrees Celsius Agree Dissolved 25 deg C Specific conductance uS/cm @25C
83436 Physical Specific conductance, bulk atmospheric deposition, unfiltered, field, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
83437 Physical Specific conductance, bulk atmospheric deposition, filtered, laboratory, microsiemens per centimeter at 25 degrees Celsius Agree Dissolved 25 deg C Specific conductance uS/cm @25C
83438 Physical Specific conductance, bulk atmospheric deposition, unfiltered, laboratory, microsiemens per centimeter at 25 degrees Celsius Agree Total 25 deg C Specific conductance uS/cm @25C
83459 Physical Atmospheric deposition, bulk, liters Agree Total l
84179 Physical Ignitability, bed sediment, dry, yes or no, code Not checked code
84180 Physical Soil horizon (U.S. Dept. of Agriculture Soil Conservation Service, Soil Survey Manual, 1993), code Not checked code
85310 Physical Depth of lake, maximum, meters Not checked Maximum Depth m
85311 Physical Depth of lake, mean, meters Not checked Mean Depth m
85328 Physical Depth to 1 percent of surface light, meters Not checked Light attenuation, depth at 99% m
85540 Physical Air, water, dissolved, volume percent of dissolved gases Agree Dissolved 132259-10-0 %
85541 Physical Inert gases, water, dissolved, volume percent of dissolved gases Agree Dissolved Inert gases %
85555 Physical Gas/water ratio, cubic feet per barrel Agree ft3/barrel
85557 Physical Temperature, low saturation, degrees Celsius Agree deg C
85558 Physical Temperature, high saturation, degrees Celsius Agree deg C
85559 Physical Pressure, low saturation, pounds per square inch Agree psi
85560 Physical Pressure, high saturation, pounds per square inch Agree psi
85583 Physical Temperature, intragravel water, degrees Celsius Agree Temperature, water deg C
85588 Physical Gross heating value of dissolved hydrocarbons, dry, calculated, British thermal units per cubic foot at 60 degrees Fahrenheit and 14.73 pounds per square inch absolute Not checked Btu/ft3
85599 Physical Rainfall, total for defined period, centimeters Not checked Total cm/sample
85822 Physical Moisture content, biota, tissue, wet weight, percent of total weight Agree Wet Total Moisture content %
90010 Physical Temperature, area-weighted-average, degrees Celsius USGS use and no use by EPA deg C
90034 Physical Depth to 1 percent of surface light, cross section average, feet USGS use and no use by EPA ft
90077 Physical Transparency, water, in situ, Secchi disc, cross section average, inches USGS use and no use by EPA Water transparency, Secchi disc in
90094 Physical Specific conductance, water, unfiltered, area weighted average, microsiemens per centimeter at 25 degrees Celsius USGS use and no use by EPA Total 25 deg C Specific conductance uS/cm @25C
90095 Physical Specific conductance, water, unfiltered, laboratory, microsiemens per centimeter at 25 degrees Celsius USGS use and no use by EPA Total 25 deg C Specific conductance uS/cm @25C
90096 Physical Specific conductance, water, filtered, laboratory, microsiemens per centimeter at 25 degrees Celsius Not checked Dissolved Specific conductance uS/cm @25C
90198 Physical Depth to 10 percent surface light, cross section average, feet USGS use and no use by EPA ft
90199 Physical Depth to 50 percent surface light, cross section average, feet USGS use and no use by EPA Light attenuation, depth at 50% ft
90200 Physical Incident light intensity, 400-700 nanometers, cross-sectional average, microeinsteins per square meter per second USGS use and no use by EPA uE/m2/sec
90400 Physical pH, water, area weighted average, standard units USGS use and no use by EPA pH std units
90860 Physical Salinity, water, unfiltered, practical salinity units at 25 degrees Celsius USGS use and no use by EPA Total 25 deg C Salinity PSS
90862 Physical Salinity, water, unfiltered, Practical Salinity Scale Not checked Total Salinity PSS
91011 Physical Solids settleable in 15 minutes, water, unfiltered, milliliters per liter USGS use and no use by EPA 15 Minutes Settleable Settleable solids ml/l
91016 Physical Biochemical oxygen demand, water, unfiltered, 5 days at 20 degrees Celsius, short tons per day USGS use and no use by EPA 5 Day Total 20 deg C Biochemical oxygen demand, standard conditions tons/day
91017 Physical Suspended solids dried at 110 degrees Celsius, water, unfiltered, short tons per day USGS use and no use by EPA Suspended 110 deg C Total suspended solids tons/day
91055 Physical Suspended solids dried at 105 degrees Celsius, water, unfiltered, short tons per day USGS use and no use by EPA Suspended 105 deg C Total suspended solids tons/day
91056 Physical Loss on ignition of suspended solids, water, unfiltered, short tons per day USGS use and no use by EPA Suspended Volatile Suspended Solids tons/day
91146 Physical Pump rate, gallons per minute Not checked gal/min
91155 Physical Moisture content, bed sediment smaller than 63 microns, wet sieved (native water), recoverable, dry weight, percent Not checked Dry < 0.063 Bed Sediment %
91156 Physical Moisture content, bed sediment, dry weight, percent Not checked Dry Bed Sediment %
95202 Physical Phycocyanin fluorescence (fPC), water, in situ, cells per milliliter USGS use and no use by EPA #/ml
95902 Physical Noncarbonate hardness, water, milligrams per liter as calcium carbonate USGS use and no use by EPA Hardness, non-carbonate mg/l CaCO3
99019 Physical Water level, depth below land surface, meters USGS use and no use by EPA Depth, from ground surface to well water level m
99020 Physical Elevation above NGVD 1929, meters USGS use and no use by EPA m
99060 Physical Discharge, cubic meters per second USGS use and no use by EPA Mean 1 Day m3/sec
99061 Physical Discharge, instantaneous, cubic meters per second USGS use and no use by EPA Stream flow, instantaneous m3/sec
99064 Physical Water surface elevation difference between two locations, feet Not checked ft
99065 Physical Gage height, above datum, meters USGS use and no use by EPA Gage height m
99066 Physical Hyporheic flux of water from groundwater to surface water, milliliters per square centimeter per day USGS use and no use by EPA ml/cm2/day
99067 Physical Difference between observed and predicted water surface elevation, feet Not checked ft
99227 Physical Primary water level, Aquatrak, distance from measuring point to water surface, meters USGS use and no use by EPA m
99231 Physical Electrical resistance, ohms USGS use and no use by EPA ohms
99232 Physical Volumetric soil moisture content period, for internal control of sensor, milliseconds USGS use and no use by EPA ms
99243 Physical Distance to snow surface from sensor, centimeters Not checked cm
99401 Physical Dissolved solids, water, filtered, estimated by regression equation, milligrams per liter USGS use and no use by EPA Dissolved Total dissolved solids mg/l
99402 Physical Suspended solids, water, unfiltered, estimated by regression equation, milligrams per liter USGS use and no use by EPA Suspended Total suspended solids mg/l
99403 Physical Total solids, water, unfiltered, estimated by regression equation, milligrams per liter USGS use and no use by EPA Total Total solids mg/l
99433 Physical Dissolved solids, water, filtered, lake-volume weighted, milligrams per liter Not checked Dissolved mg/l
99434 Physical Dissolved solids, in entire lake, short tons Not checked Dissolved tons
99772 Physical Precipitation, millimeters USGS use and no use by EPA Precipitation mm
99872 Physical Turbidity, water, unfiltered, laboratory, Hach 2100AN, nephelometric turbidity units USGS use and no use by EPA Total Turbidity NTU
99974 Physical Specific conductance, 1 meter below water surface, microsiemens per centimeter at 25 degrees Celsius USGS use and no use by EPA 25 deg C Specific conductance uS/cm @25C
99975 Physical pH, 1 meter below water surface, standard units USGS use and no use by EPA pH std units
99976 Physical Temperature, 1 meter below water surface, degrees Celsius USGS use and no use by EPA Temperature, water deg C
99978 Physical Specific conductance, water, 1 meter above bottom, microsiemens per centimeter at 25 degrees Celsius USGS use and no use by EPA 25 deg C Specific conductance uS/cm @25C
99979 Physical pH, water, 1 meter above bottom, standard units USGS use and no use by EPA pH std units
99980 Physical Temperature, water, 1 meter above bottom, degrees Celsius USGS use and no use by EPA Temperature, water deg C
99982 Physical Specific conductance, water, mid-depth of water column, microsiemens per centimeter at 25 degrees Celsius USGS use and no use by EPA 25 deg C Specific conductance uS/cm @25C
99983 Physical pH, water, mid-depth of water column, standard units USGS use and no use by EPA pH std units
99984 Physical Temperature, water, mid-depth of water column, degrees Celsius USGS use and no use by EPA Temperature, water deg C
99986 Physical Solar radiation (average flux density on a horizontal surface during measurement interval), watts per square meter USGS use and no use by EPA Solar irradiation, local W/m2
99987 Physical Solar radiation (total flux density on a horizontal surface during measurement interval), megajoules per square meter USGS use and no use by EPA Total MJ/m2
99988 Physical Photosynthetically active radiation (average flux density on a horizontal surface during measurement interval), micromoles of photons per square meter per second USGS use and no use by EPA Light, photosynthetic active radiation (PAR) umol/m2/s
99989 Physical Photosynthetically active radiation (total flux density on a horizontal surface during measurement interval), millimoles of photons per square meter USGS use and no use by EPA Total mmol/m2
99997 Physical Photosynthetically active radiation (PAR) in water at the 1% light level, micromoles of photons per square meter per second USGS use and no use by EPA umol/m2/s