Basin Characteristic Definitions
The names of the basin characteristics given in the StreamStats output for ungaged sites are shown in the second column of the table below, named Characteristic. Shortened labels for the characteristics used by the database are shown in the first column, named Label. The definitions of the basin characteristics are given in third column, named Definition.| Label | Characteristic | Definition | ABEL8K | Drainage_Area_below_8000ft | Drainage Area below 8000ft |
|---|---|---|
| ACARBON | Area_of_Carbonate_Rock | Area underlain by carbonate rock |
| ACHSWAMP | Area_of_Main_Channel_Swamp | Main Channel Swamp |
| ACLAY | Area_of_Lacustrine_Clay_and_Silt | Area underlain by lacustrine clay and silt |
| ACRSDFT | Area_of_Coarse_Stratified_Drift | Area underlain by stratified drift |
| ACRSTILL | Area_of_Coarse_Till | Area underlain by coarse-textured glacial till |
| ACTIVE | Active_station | Station is currently active |
| ADETEN | Area_of_Lake_and_Detention_Basin | Lake and Detention Basin Area |
| ADEVNLCD01 | Developed_area_from_NLCD2001 | Total area of land-use classifications 21-24 from NLCD 2001 |
| ADJCOEFF | Adjustment_Coefficient_From_Page_11 | Coefficient to adjust estimates for percentage of carbonate rock in Western Maryland |
| AFINMOR | Area_of_End_Moraine_Fine_Till | Area underlain by end moraines of fine-textured till |
| AFOREST | Area_of_Forest_Cover | Area covered by forest |
| AG_OF_DA | Ag_Land_Percentage | Agricultural Land in Percentage of Drainage Area (Idaho Logistic Regression Equations SIR 2006-5035 |
| AGLACIER | Area_of_Glaciers | Area covered by glaciers |
| AIMPERV | Area_of_Impervious_Surfaces | Impervious area |
| AIMPNLCD10 | Impervious_Area_from_NLCD2001 | Impervious area determined from NLCD 2001 impervious dataset |
| ALAKE | Area_of_Lakes_and_Ponds | Area of Lakes and Ponds |
| ALIME | Area_of_Limestone | Area underlain by limestone geology |
| ALTIND | Altitude_Index | Altitude Index |
| AMEDTILL | Medium_Till_Area | Area underlain by medium-textured glacial till |
| AMUCK | Area_of_Peat_and_Muck | Area underlain by peat and muck |
| AOS | Average_Maximum_Overland_Slope | Average Maximum Overland Slope |
| AOUTWASH | Area_of_Outwash | Area underlain by outwash |
| APRAV | Mean_April_Temperature | Mean April Temperature |
| ARBEL8K | Area_below_8000_ft | Drainage Area below 8000ft |
| ASOILA | Area_of_Hydrologic_Soil_Type_A | Area underlain by hydrologic soil type A |
| ASOILD | Area_of_Hydrologic_Soil_Type_D | Area underlain by hydrologic soil type D |
| ASTORAGE | Area_of_Storage | Area of Storage (lakes - ponds - and wetlands ) |
| ATILROCK | Area_of_Thin_Till_over_Bedrock | Area underlain by thin glacial till over bedrock |
| AUGAV | Mean_August_Temperature | Mean August Temperature |
| AURBAN | Area_of_Urban_Cover | Area covered by urban land use |
| AVMXSS | Average_Maximum_Soil_Slope | Average Maximum Soil Slope |
| AWETLAND | Area_of_Wetlands | Area of Wetlands |
| AZIMUTH | Azimuth | Decimal degrees from north of a straight line connecting the points 10- and 85-percent of distance along main stream channel |
| BARRENLU92 | Percent_Barren_from_NLCD1992 | Percent Barren from NLCD1992 |
| BASIN | Drainage_Basin_Code | Local code of major drainage basin in which the station is located |
| BASINPERIM | Basin_Perimeter | Perimeter of the drainage basin as defined in SIR 2004-5262 |
| BASLENAH | Basin_Length_ArcHydro_Method | Basin length from outlet to basin divide determined using the method in the ArcHydro Toolset |
| BASSTRMORD | Basin_Stream_Order | Strahler stream order of the main channel at the basin outlet |
| BDF | Basin_Development_Factor | Urbanization index described by Sauer and others (1981) - Also called Urbanization Index in Texas |
| BEGIN_REC | Begin_date_of_record | First day of record |
| BFI | Base_Flow_Index | Proportion of mean annual flow that is from ground water (base flow) from Wahl and Wahl, 1988 |
| BSLDEM10ff | Mean_Basin_Slope_from_10m_DEM_ft_per_ft | Mean basin slope computed from 10 m DEM in feet per foot |
| BSLDEM10M | Mean_Basin_Slope_from_10m_DEM | Mean basin slope computed from 10 m DEM |
| BSLDEM250 | Mean_Basin_Slope_from_250K_DEM | Mean basin slope computed from 1:250K DEM |
| BSLDEM30M | Mean_Basin_Slope_from_30m_DEM | Mean basin slope computed from 30 m DEM |
| BSLOPCM | Mean_Basin_Slope_ft_per_mi | Mean basin slope determined by summing lengths of all contours in basin mulitplying by contour interval and dividing product by drainage area |
| BSLOPD | Mean_Basin_Slope_degrees | Mean basin slope measured in degrees |
| BSLOPGM | Mean_Basin_Slope_ft_per_ft | Mean basin slope determined using the grid-sampling method |
| CARBON | Percent_Carbonate | Percentage of area of carbonate rock |
| CCM | Constant_of_Channel_Maintenance | Constant of channel maintenance computed as drainage area divided by total stream length |
| CELVBLUE | Average_Channel_Elevation | Average of outlet elevation and the elevation at the upstream extent of the mapped stream |
| CELVMEAN | Mean_Main_Channel_Elevation | Mean elevation along the main channel |
| CF | Climate_Factor | Climate factor for area |
| CHANCOND | Average_Channel_Condition | Condition between points 100- 75- 50- and 25-percent along main channel - 2 if entirely paved - 1 if unpaved |
| CHSWAMP | Percent_Main_Channel_Swamp | Percentage of area of main channel swamps |
| CIRC_RATIO | Circularity_Ratio | Circularity Ratio |
| CLENBLUE | Main_Channel_Blue_Line_Length | Length of main channel shown as blue line on a topographic map |
| COASTDIST | Distance_From_Coast_To_Basin_Centroid | Shortest distance from Gulf of Maine line along coast to basin centroid |
| COMPRAT | Compactness_Ratio | A measure of basin shape related to basin perimeter and drainage area |
| CONIF | Percent_Coniferous_Forest | Percentaqe of land surface covered by coniferous forest |
| CONTDA | Contributing_Drainage_Area | Area that contributes flow to a point on a stream |
| CONTROL | Percent_Controlled | Percent of basin controlled by lakes swamps and reservoirs |
| CONTROLLED | Percentage_of_Controlled_Area | Percent of basin controlled by lakes swamps and reservoirs - see WRIR 00 4189 |
| CONVEY | Bank_Full_Channel_Conveyance | Conveyance of main stream channel at bank-full conditions |
| COUNTY | County_Code | County code |
| CRSDFT | Percent_Coarse_Stratified_Drift | Percentage of area of coarse-grained stratified drift |
| CRSTILL | Percent_Coarse_Till | Percentage of area of coarse till |
| CSL10_85 | Stream_Slope_10_and_85_Method | Change in elevation between points 10 and 85 percent of length along main channel to basin divide divided by length between points |
| CSL10_85fm | Stream_Slope_10_and_85_Method_ft_per_mi | Change in elevation between points 10 and 85 percent of length along main channel to basin divide divided by length between points ft per mi |
| CSL1085LFP | Stream_Slope_10_and_85_Longest_Flow_Path | Change in elevation between points 10 and 85 percent of length along the longest flow path determined by a GIS divided by length between the points |
| CSLArc10 | Stream_Slope_ArcHydro_Method_10m_DEM | Stream slope computed using method from ArcHydro Tools and 10 meter DEM |
| CSLBlue | Stream_Slope_Blue_Line_Method | Change in elevation of the longest stream divided by stream length |
| DA1000 | Drainage_Area_Divided_By_1000 | Drainage area divided by 1000 |
| DATUM | Datum_of_Latitude_Longitude | Datum used to determine the site coordinates |
| DAUNREG | Unregulated_Drainage_Area | Unregulated drainage area used in OK regulated equations |
| DECAVPRE | Mean_December_Precipitation | Mean December Precipitation |
| DECAVTMP | Mean_December_Temperature | Mean December Temperature |
| DESMOIN | Des_Moines_Lobe | Area underlain by Des Moines Lobe |
| DETEN | Percent_Lake_and_Detention_Basin | Percentage of area of lakes and detention basins |
| DEVNLCD01 | Percent_developed_from_NLCD2001 | Percentage of land-use categories 21-24 from NLCD 2001 |
| DEVPT_LU92 | Percent_Developed_from_NLCD92 | Percent Developed from NLCD92 |
| DINTNLCD01 | Development_Intensity_from_NLCD2001 | Impervious percentage computed as ((.10*A21+.25*A22+.65*A23+.90*A24)/DA)*100 from NLCD 2001 |
| DIRECT | Directions | Directions |
| DISTANCE | Distance_from_Ungaged_Station | Distance from Ungaged Station |
| DISTRICT | District_Code | Code of the state where the station is located. |
| DMARMAX | Normal_Daily_Max_March_Temp | Normal Daily Maximum March Temperature |
| DRFTPERSTR | Stratified_Drift_per_Stream_Length | Area of stratified drift per unit of stream length |
| DRNAREA | Drainage_Area | Area that drains to a point on a stream |
| DRNFREQ | Drainage_Frequency | Number of first order streams per square mile of drainage area |
| DURREG | Flow_Duration_Region_Code | Flow-Duration Hydrologic Region code |
| DV_OF_DA | Dev_Land_percentage | Developed Land in Percentage of Drainage Area (Idaho Logistic Regression Equations SIR 2006-5035 |
| EFFECTDA | Effective_Drainage_Area | Total drainage area minus area upstream from erosion-control and flood-retention structures |
| EL1200 | Percentage_of_Basin_Above_1200_ft | Percentage of basin at or above 1200 ft elevation |
| EL5000 | Percent_above_5000_ft | Percent of area above 5000 ft |
| EL6000 | Percent_above_6000_ft | Percent of area above 6000 ft |
| EL7500 | Percent_above_7500_ft | Percent of area above 7500 ft |
| ELEV | Mean_Basin_Elevation | Mean Basin Elevation |
| ELEV1000 | Elevation_in_Thousands | Elevation in Thousands |
| ELEVMAX | Maximum_Basin_Elevation | Maximum basin elevation |
| ELONGRATIO | Elongation_Ratio | Elongation Ratio |
| ELV10_85 | Elevation_of_10_and_85_points | Average of channel elevations at points 10- and 85- percent above gage - Equivalent to Altitude Index |
| END_REC | End_date_of_record | Last day of record |
| EVAP | Mean_Annual_Lake_Evaporation | Mean Annual Lake Evaporation |
| EVAPAN | Mean_Annual_Pan_Evaporation | Mean Annual Pan Evaporation |
| FDRATIO | Flow_Duration_Ratio | 20-percent flow duration divided by 90-percent flow duration |
| FEBAVPRE | Mean_February_Precipitation | Mean February Precipitation |
| FEBAVTMP | Mean_February_Temperature | Mean February Temperature |
| FINMOR | Percent_Fine_End_Moraine | Percentage of area of end moraine fine till |
| FIRSTYEAR | First_Year_of_Record | Year in which record was first collected or used for analysis |
| FOREST | Percent_Forest | Percentage of area covered by forest |
| FORESTp1 | Percent_Forest_add_1__ID_ROI_Parm | Percent Forest plus 1 (ID ROI Parm) |
| FORUPLLU92 | Percent_Forested_Upland_from_NLCD1992 | Percent Forested Upland from NLCD1992 |
| FOSTREAM | Number_of_First_Order_Streams | Number of first order streams determined using the Strahler stream ordering system |
| FROST | Mean_February_28_Frost_Depth | Mean frost depth on February 28 |
| GEOFACTVT | Geographic_Factor_for_VT | Northing of the centroid of the drainage basin in the Vermont State Plane coordinate system divided by 100000 then increased by 1 |
| GEOFACTWY | Geographic_Factor_for_WY | Geographic factor for Wyoming from plate 1 of Lohman (1988) |
| GLACIATED | Percent_of_Glaciation | Percentage of basin area that was historically covered by glaciers |
| GLACIER | Percent_Glaciers | Percentage of area of Glaciers |
| GUTTER | Gutter_Length | Length of gutters per square mile of drainage area |
| GWHEAD | Groundwater_Head | Mean - minimum basin elevation |
| HIELONGRAT | Hawaii_Elongation_Ratio | Ratio of (1)diameter of circle with equal area as basin to (2)basin length, as defined in SIR 2004-5262 |
| HIGHEQU | High_Flow_Regression_Equation | Indicates whether the site was used to develop high-flow regression equations |
| HIGHREG | High_Flow_Region_Code | High-Flow Hydrologic Region code |
| HIMARRATE | Hawaii_Mean_Rainfall_Rate | Mean annual rainfall rate determined based on the method described in SIR 2004-5262 |
| HIRAINRATE | Maximum_Weighted_Rainfall_Rate | Maximum Weighted Rainfall Rate |
| HOMDEN2000 | Housing_Density_during_2000 | Housing density from 2000 census data |
| HOMDENCYR | Housing_Density_of_Centroid_Year | Housing density for centroid year of streamflow data collection |
| HOMEDENS | Housing_Density | Average homes per acre in watershed |
| HRBCLTLU92 | Percent_Cult_Herb_Upland_from_NLCD1992 | Percent Cultivated Herbaceous Upland from NLCD1992 |
| HRBNATLU92 | Percent_Nat_Herb_Upland_from_NLCD1992 | Percent Natural Herbaceous Upland from NLCD1992 |
| HUC | Hydrologic_Unit_Number | Hydrologic Unit Number |
| I24H100Y | 24_Hour_100_Year_Precipitation | Maximum 24-hour precipitation that occurs on average once in 100 years |
| I24H10Y | 24_Hour_10_Year_Precipitation | Maximum 24-hour precipitation that occurs on average once in 10 years |
| I24H25Y | 24_Hour_25_Year_Precipitation | Maximum 24-hour precipitation that occurs on average once in 25 years |
| I24H2Y | 24_Hour_2_Year_Precipitation | Maximum 24-hour precipitation that occurs on average once in 2 years - Equivalent to precitation intensity index |
| I24H50Y | 24_Hour_50_Year_Precipitation | Maximum 24-hour precipitation that occurs on average once in 50 years |
| I24MAX | 24_Hour_Maximum_Precipitation | Maximum 24-hour precipitation for period of record |
| I2H2Y | 2_Hour_2_Year_Precipitation | Maximum 2-hour precipitation that occurs on average once in 2 years |
| ILREG1 | Region_1_Indicator__enter_1 | Indicator variable for IL region 1, enter 1 if site is in region 1 else 0 |
| ILREG3 | Region_3_Indicator__enter_1 | Indicator variable for IL region 3, enter 1 if site is in region 3 else 0 |
| ILREG5 | Region_5_Indicator__enter_1 | Indicator variable for IL region 5, enter 1 if site is in region 5 else 0 |
| ILREG6 | Region_6_Indicator__enter_1 | Indicator variable for IL region 6, enter 1 if site is in region 6 else 0 |
| ILREG7 | Region_7_Indicator__enter_1 | Indicator variable for IL region 7, enter 1 if site is in region 7 else 0 |
| IMPERV | Percent_Impervious | Percentage of impervious area |
| IMPNLCD01 | Percent_Impervious_NLCD2001 | Percentage of impervious area determined from NLCD 2001 impervious dataset |
| JANAVTMP | Mean_January_Temperature | Mean January Temperature |
| JANMAXTMP | Mean_Maximum_January_Temperature | Mean Maximum January Temperature |
| JANMINTMP | Mean_Min_January_Temperature | Mean Minimum January Temperature |
| JULYAVEPRE | Mean_July_Precipitation | Mean July Precipitation |
| JULYAVTMP | Mean_July_Temperature | Mean July Temperature |
| JULYMAXTMP | Mean_Max_July_Temperature | Mean Maximum July Temperature |
| JULYMIN | Mean_Minimum_July_Temperature | Mean Minumum July Temperature |
| JUNEAVPRE | Mean_June_Precipitation | Mean June Precipitation |
| JUNEAVTMP | Mean_June_Temperature | Mean June Temperature |
| LAGFACTOR | Lag_Factor | Lag Factor as defined in SIR 2006-5112 |
| LAGTIME | Lagtime | Elapsed time from center of mass of rainfall excess to center of mass of flood hydrograph |
| LAKEAREA | Percent_Lakes_and_Ponds | Percentage of Lakes and Ponds |
| LAKESp1 | Percent_Lakes_add_1__MN_ROI_Parm | Percent Lakes plus 1 (MN ROI Parm) |
| LASTYEAR | Last_Year_of_Record | Year in which record was last collected or used for analysis |
| LAT_CENT | Latitude_of_Basin_Centroid | Latitude of Basin Centroid |
| LAT_GAGE | Latitude | Latitude |
| LAT_NHD | Latitude_on_NHD | Latitude of station location on National Hydrography Dataset |
| LAT_OUT | Latitude_of_Basin_Outlet | Latitude of Basin Outlet |
| LENGTH | Main_Channel_Length | Length along the main channel from the measuring location extended to the basin divide |
| LIME | Percent_Limestone | Percentage of area of limestone geology |
| LNG_GAGE | Longitude | Longitude |
| LOESSDEP | Loess_Depth | Depth of loess deposits |
| LOGDA1000 | Log_Of_Drainage_Area_Divided_By_1000 | Log of drainage area divided by 1000 |
| LOGPREC28 | Log_Of_Mean_Annual_Precip_Divided_By_28 | Log of mean annual precipitation from PRISM divided by 28 |
| LON_NHD | Longitude_on_NHD | Longitude of station location on National Hydrography Dataset |
| LONG_CENT | Longitude_of_Basin_Centroid | Longitude Basin Centroid |
| LONG_OUT | Longitude_of_Basin_Outlet | Longitude of Basin Outlet |
| LOWEQU | Low_Flow_Regression_Equation | Indicates whether the site was used to develop low-flow regression equations |
| LOWREG | Low_Flow_Region_Code | Low-Flow Hydrologic Region code |
| LSTPERM | Least_Permeable_Layer_Permeability | Permeability of least permeable layer |
| LU12 | Sum_of_Land_Use_I_and_II | Index based on the sum of land use types I and II in Portland-Vancouver WA |
| MAPM | Mean_Annual_Precip_Basin_Average | Mean Annual Precip Basin Average |
| MARAVPRE | Mean_March_Precipitation | Mean March Precipitation |
| MARAVTMP | Mean_March_Temperature | Mean March Temperature |
| MAREGION | Massachusetts_Region | Region of Massachusetts 0 for Eastern 1 for Western |
| MARMAXTMP | Mean_Max_March_Temperature | Mean Maximum March Temperature |
| MAYAVPRE | Mean_May_Precipitation | Mean May Precipitation |
| MAYAVTMP | Mean_May_Temperature | Mean May Temperature |
| MCD | MCD_Code | MCD Code |
| MCSP | Main_Channel_Slope_Proportion | Main channel slope proportion computed by Basinsoft as main channel length divided by the square root of the main channel slope |
| MCSRBSFT | Main_Channel_Sinuosity_Ratio | Main-channel sinuosity ratio computed by Basinsoft as main channel length divided by basin length |
| MEDPREC | Median_Annual_Precipitation | Median Annual Precipitation |
| MEDTILL | Percent_Medium_Till | Percentage of area of medium-textured glacial till |
| MINBELEV | Minimum_Basin_Elevation | Minimum basin elevation |
| MIXFOR | Percent_Mixed_Forest | Percentage of land area covered by mixed deciduous and coniferous forest |
| MONREG | Monthly_and_Annual_Region_Code | Monthly and Annual Hydrologic Region code |
| MORTILL | End_Moraines_of_Fine_Textured_Till | Percentage of End Moraines of Fine-Textured Till |
| MSTPERM | Most_Permeable_Layer_Permeability | Permeability of the most permeable layer |
| MUCK | Percent_Peat_and_Muck | Percentage of area of peat and muck |
| MXSNO | Median_Seasonal_Maximum_Snow_Depth | 50th percentile of seasonal maximum snow depth from Northeast Regional Climate Center atlas by Cember and Wilks, 1993 |
| NDAY_REC | Number_of_days_of_record | Number of days of record |
| NDAYSGT0 | Number_of_days_GT_0 | Number of days with flow greater than zero |
| NFSL30 | North_Facing_Slopes_Grt_Than_30_Percent | North-Facing Slopes Greater Than 30 Percent |
| NOVAVPRE | Mean_November_Precipitation | Mean November Precipitation |
| NOVAVTMP | Mean_November_Temperature | Mean November Temperature |
| OCTAVPRE | Mean_October_Precipitation | Mean October Precipitation |
| OCTAVTMP | Mean_October_Temperature | Mean October Temperature |
| OHCLFAC100 | Ohio_Climate_Factor_100_Year | Ohio Climate Factor 100 Year |
| OHCLFAC2 | Ohio_Climate_Factor_2_Year | Ohio Climate Factor 2 Year |
| OHCLFAC25 | Ohio_Climate_Factor_25_Year | Ohio Climate Factor 25 Year |
| OHPHYSSECT | Ohio_Physiographic_Sections | Ohio Physiographic Sections |
| OHREG_CODE | Ohio_Flood_Region_Letter_Code | Ohio Flood Region Letter Code |
| OHREGA | Ohio_Region_A_Indicator_1_if_in_A_else_0 | Ohio Region A Indicator |
| OHREGC | Ohio_Region_C_Indicator_1_if_in_C_else_0 | Ohio Region C Indicator |
| OTHEQU | Other_Regression_Equation | Indicates whether the site was used to develop regression equations for other than high or low flows |
| OUTWASH | Percent_Outwash | Percentage of area of outwash |
| PCLAY | Percent_Lacustrine_Clay_and_Silt | Percentage of lacustrine clay and silt |
| PCTSNDGRV | Percent_Underlain_By_Sand_And_Gravel | Percentage of land surface underlain by sand and gravel deposits |
| PERREC | Period_of_record | Period of record |
| PLCHSWAMP | Percent_Length_of_Main_Channel_Swamps | Percentage of the main channel length that flows through swamps |
| POPDENS | Basin_Population_Density | Basin Population Density |
| PRC1 | Mean_January_Precipitation | Mean January Precipitation |
| PRC4 | Mean_April_Precipitation | Mean April Precipitation |
| PRC8 | Mean_August_Precipitation | Mean August Precipitation |
| PRCWINTER | Mean_Annual_Winter_Precipitation | Mean annual precipitation for December through February |
| PREBC0103 | Jan_to_Mar_Basin_Centroid_Precip | Mean annual precipitation of basin centroid for January 1 to March 15 winter period |
| PREC10to4 | Mean_Oct_to_Apr_Precipitation | Mean precipitation for winter period defined as October to April |
| PRECIP | Mean_Annual_Precipitation | Mean Annual Precipitation |
| PRECIP28 | Mean_Annual_Precipitation_Divided_By_28 | Mean annual precipitation from PRISM divided by 28 |
| PRECIPCENT | Mean_Annual_Precip_at_Basin_Centroid | Mean Annual Precip at Basin Centroid |
| PRECless35 | Mean_Annual_Precip_less_35_LA_ROI_Parm | Mean Annual Precip - 35 (LA ROI Parm) |
| PREG_03_05 | Mar_to_May_Gage_Precipitation | Mean precipitation at gaging station location for March 16 to May 31 spring period |
| PREG_06_10 | Jun_to_Oct_Gage_Precipitation | Mean precipitation at gaging station location for June to October summer period |
| PSFSLp1 | Pct_South_Facing_Slopes_add_1__ID_ROI | Pct. South Facing Slopes plus 1 (ID ROI Parm) |
| PWIN_ME | Dec_to_Feb_Mean_Precipitation | Mean annual precipitation for winter defined for Maine as December to February |
| RCN | Runoff_Curve_Number | Runoff-curve number as defined by NRCS and shown in table 4 of Dillow (1996) |
| RECESS | Recession_Index | Number of days required for streamflow to recede one order of magnitude when hydrograph is plotted on logarithmic scale |
| REGULATE | Regulated | Indicates whether flow at the site is affected by regulations or diversions |
| RELIEF | Relief | Maximum - minimum elevation |
| RELRELF | Relative_Relief | Basin relief divided by basin perimeter |
| REMARKS | Remarks | Remarks |
| ROCKDEP | Depth_to_Rock | Depth to rock |
| ROIREGN | ROI_Region_ID | ID for the radius of Influence region |
| ROTUNDBSFT | Rotundity_of_Basin_from_Basinsoft | Rotundity of basin from Basinsoft computed as 0.785 time shape factor |
| RUGGED | Ruggedness_Number | Ruggedness number computed as stream density times basin relief |
| RUNCOEF | Runoff_Coefficient | Soil runoff coefficient defined in Davis (1975) |
| SANDGRAV | Fraction_Underlain_By_Sand_And_Gravel | Fraction of land surface underlain by sand and gravel deposits |
| SEPAVPRE | Mean_September_Precipitation | Mean September Precipitation |
| SEPAVTMP | Mean_September_Temperature | Mean September Temperature |
| SHAPE | Shape_Factor | Shape Factor for Area |
| SHAPEBSFT | Shape_Factor_from_Basinsoft | Shape factor from Basinsoft computed as basin length divided by basin width |
| SINUOS | Main_Channel_Sinuosity | Main Channel Sinuosity |
| SLENRAT | Slenderness_Ratio | Main channel length - squared - divided by the contributing drainage area |
| SLOP30 | Slopes_Greater_Than_30_Percent | Slopes Greater Than 30 Percent |
| SLOP50 | Slopes_Greater_Than_50_Percent | Slopes Greater Than 50 Percent as percent of drainage area |
| SLOPERAT | Slope_Ratio | Slope ratio computed as main channel slope divided by basin slope |
| SLOPERATIO | Slope_Ratio_NY | Ratio of main channel slope to basin slope as defined in SIR 2006-5112 |
| SN10 | 10_Yr_Max_Mar_15_Snow_Water_Equiv | Maximum March 15 Water Equivalent of Snow Cover at 10-Year Recurrence Interval |
| SN100 | 100_Yr_Max_Mar_15_Snow_Water_Equiv | Maximum March 15 Water Equivalent of Snow Cover at 100-Year Recurrence Interval |
| SN2 | 2_Yr_Max_Mar_15_Snow_Water_Equiv | Maximum March 15 Water Equivalent of Snow Cover at 2-Year Recurrence Interval |
| SN25 | 25_Yr_Max_Mar_15_Snow_Water_Equiv | Maximum March 15 Water Equivalent of Snow Cover at 25-Year Recurrence Interval |
| SN50 | 50_Yr_Max_Mar_15_Snow_Water_Equiv | Maximum March 15 Water Equivalent of Snow Cover at 50-Year Recurrence Interval |
| SNOAPR | April_Mean_Snow_Water_Equiv | Mean Water Equivalent of Snow Cover in April |
| SNOFALL | Mean_Annual_Snowfall | Mean Annual Snowfall |
| SNOMAR | March_Snow_Water_Equivalent | Mean Water Equivalent of Snow Cover in March |
| SNOWATER | Mean_Snow_Water_Equivalent | Water Equivalent of Mean Annual Snowfall |
| SOIL_INF | Soil_Infiltration | Soil infiltration index from NRCS |
| SOILA | Percent_Hydrologic_Soil_Type_A | Percentage of area of Hydrologic Soil Type A |
| SOILD | Percent_Hydrologic_Soil_Type_D | Percentage of area of Hydrologic Soil Type D |
| SOILINDEX | Mean_Basin_Hydrologic_Soils_Index | Mean STATSGO Hydrologic Soils Index (from PL. 2 WRIR 03-4107 for WY) |
| SOILPERM | Average_Soil_Permeability | Average Soil Permeability |
| STAID | Station_ID | Station Identification Number |
| STANAME | Station_Name | Station Name |
| STATE | State_Code | State code |
| STATYPE | Station_type | Station type code |
| STORAGE | Percent_Storage | Percentage of area of storage (lakes ponds reservoirs wetlands) |
| STORAGEp1 | Percent_Storage_add_1__MN_ROI_Parm | Percent Storage plus 1 (MN ROI Parm) |
| STORDELU | Percent_Storage_from_DE_Dataset | Percentage of wetlands and water bodies determined from 2003 Delaware land-use dataset |
| STORNHD | Percent_Storage_from_NHD | Percent storage (wetlands and waterbodies) determined from 1:24K NHD |
| STORNLCD | Percent_Storage_from_NLCD | Percentage of water bodies and wetlands determined from the NLCD |
| STRDEN | Stream_Density | Stream Density |
| STREAM_VAR | Streamflow_Variability_Index | Streamflow variability index as defined in WRIR 02-4068 |
| STRMTOT | Total_Stream_Length | Total length of mapped streams in basin |
| SYNTHET | Code_to_indicate_synthesized_data | Blank if flow data were not synthesized - S if all flows were synthesized - SL if low flows were synthesized - SP if peak flows were synthesized |
| TEMP | Mean_Annual_Temperature | Mean Annual Temperature |
| TEMP_06_10 | Jun_to_Oct_Mean_Basinwide_Temp | Basinwide average temperature for June to October summer period |
| TILROCK | Percent_Thin_Till_over_Bedrock | Percentage of area of thin glacial till over bedrock |
| TIMETOPK | TimeToPeak | TimeToPeak |
| TNCLFACT2 | Tennessee_Climate_Factor_2_Year | 2-Year Climate Factor for Tennessee |
| TNPHYSFAC | Tennessee_Physiographic_Factor | Tenessee physiographic factor, computed as described in WRIR 03-4176, p. 14 |
| TXURBINDEX | Texas_Urbanization_Index | Urbanization index defined in WRIR 82-18 |
| URBAN | Percent_Urban | Percentage of basin with urban development |
| VALLEN | Valley_Length | Valley length measured along general path of floodplane from the outlet to the basin divide |
| VOLCANIC | Percent_Volcanic | Percent of drainage area as surficial volcanic rocks as defined in SIR 2006-5035 |
| WACTCH | Width_Of_Active_Channel | Width of active channel |
| WAT_LU92 | Percent_Water_from_NLCD1992 | Percent Water from NLCD1992 |
| WATCAP | Available_Water_Capacity | Available water capacity of the top 60 inches of soil - determined from STATSGO data |
| WATWET | Percent_Open_Water_&_Herb_Wetland | Percent open water and herbaceous wetland from NLCD |
| WBANKFULL | Width_Of_Bankfull_Channel | Width of channel at bankfull |
| WE_MAR2 | March_water_equivalent_2_year_RI | Water equivalent of snow cover as of the first week in March - 2-year recurrence interval |
| WETLAND | Percent_Wetlands | Percentage of Wetlands |
| WETLNDLU92 | Percent_Wetland_from_NLCD1992 | Percent Wetland from NLCD1992 |
