Sediment Data Portal Guide

Video demonstrations of the portal

Video 1: Purpose and navigation of the portal

Video 2: Instructions for selecting sites and downloading data

Video 3: Information on data downloaded from the portal

Purpose

The USGS sediment data portal ( https://cida.usgs.gov/sediment/) is designed to help users identify, access, and interpret U.S. Geological Survey suspended-sediment and related data. The portal allows users to view the location of sediment sites in the context of various geospatial data layers and provides tools to allow users to select sites of interest. Daily and/or discrete suspended sediment, streamflow, and related data can then be downloaded for the entire country or for user-selected sites.  

Sources of sediment and related data

Data provided on the sediment portal are a culmination of an data recovery and quality control process described in USGS Data Report 776. The sediment portal provides three types of data; daily suspended-sediment data, discrete suspended-sediment data, and information on sediment-sampling site characteristics. The U.S. Geological Survey National Water Information System (NWIS) is the original source for discrete and daily suspended-sedime nt data provided in the portal.

Although this program has been developed by the USGS, no warranty, expressed or implied, is made by the USGS or the United States Government as to the accuracy and functioning of the program and related program material nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith.

Daily suspended-sediment data

USGS mean daily, time-weighted suspended-sediment concentration (USGS parameter code 80154), suspended-sediment load (USGS parameter code 80155), and streamflow data (USGS parameter code 00060) are retrieved directly from the U.S. Geological Survey National Water Information System (NWIS). Daily-record sediment data are daily mean estimates of suspended-sediment concentration and (or) load, and are computed at sites in which suspended-sediment concentration samples are collected approximately daily or more frequently.  It is important to note that these daily computations can be moderately to highly dependent on human interpretation of the relation between streamflow and sediment transport.  Daily streamflow, suspended-sediment and other water quality data from NWIS can be found at  https://waterdata.usgs.gov/nwis/sw.   Daily sediment data field abbreviations, definitions, and units provided by the portal can be found in Table 3.  Note that unlike discrete data, different daily sites are separated by site-specific header information which may redefine column designations.

 

Discrete suspended-sediment data

Discrete, periodically-collected suspended-sediment data were retrieved from NWIS in July of 2017. These data were screened and augmented with available daily and instantaneous streamflow information before being uploaded to the sediment portal generally according to methods described in USGS Data Report 776. Data were screened from the sediment portal if:

  • They were quality control samples, lake or reservoir samples, and or were samples thought not to represent the width of the stream cross-section.
  • They were collected at sites not colocated with (or verfied to be adjacent to) a daily streamflow station.

Note that prior to the July 2017 update, only sites with 15 or more discrete suspended-sediment samples were displayed.  The July 2017 update removed that restriction.

Only less than ("<") and greater than (">") remark codes were retained with discrete results to facilitate data analysis. To retrieve additional sites, samples, or remark codes download data via NWISweb ( https://nwis.waterdata.usgs.gov/nwis/qwdata).

In addition, most data collected before 2011 underwent a quality control screening (also described in USGS Data Report 776).

    • Description of quality control codes:  The fields "dcomment" and "icomment" are provided with discrete suspended-sediment data to denote the quality control status of suspended-sediment concentration data in relation to daily or instantaneous streamflow.  For either field, comment "G" indicates that data have been checked and passed quality control checks.  Comment "O" indicates that the suspended-sediment concentration was identified as questionable in relation to daily (dcomment field) or instantaneous flow (icomment field).  Comment "S" indicates that data have not been checked through the quality control process.  Data have not been checked either because they were collected since 2010, because the data were not in NWIS before 2010, or because data were excluded from the quality control process because of data screening (see  Data report 776 for more details).  

      The amount of discrete suspended-sediment data and extreme differences in sediment transport among sites dictated that the quality control process be a relatively rapid, site-specific, interpretive process.  Because of this, quality control flags that accompany the suspended-sediment data are not viewed as the last word as to whether the data are in error.  Flags are provided to indicate whether questions arose about the quality of specific suspended-sediment samples.      

    • Sediment sampling site characteristics: Characteristics of suspended-sediment sampling sites and upstream basins are useful for evaluating data availability and for comparing sediment data among sites. To facilitate these comparisons, site characteristic data are provided to help define the location and environmental setting of suspended-sediment sampling sites.  Site characteristic data consist of USGS stream gage identifiers, site names, drainage area, ecoregions, hydrologic unit code (HUC) watershed boundaries, streamflow exceedances, and selected information on upstream basin characteristics.  The complete list is found in Table 1 below. Information on basin characteristics is preliminary and is subject to change.


Discrete sediment data field abbreviations, definitions, and units can be found in the  Table 2  below.

For information on quality assurance tests of the accuracy and reliability of discrete, U.S. Geological Survey suspended-sediment analyses, please visit the USGS Sediment Laboratory Quality Assurance Project.

 

Updates to the USGS Data Report 776

The sediment portal differs from the process and data described in  Data Report 776 in that:
  1. The platform used to publish data on the portal is somewhat constrained compared to the individually-constructed analyses and figures in  Data Report 776.  Thus the format, functionality, and amount and types of ancillary data provided differ somewhat compared to examples in the data report.  
  2. An updated (June of 2014) retrieval of sediment and related data was used to populate the sediment portal.  Additionally, an updated list (June of 2014) of current and historical data at USGS streamgages was used to filter discrete suspended-sediment sites. A current list of USGS streamgage sites can be found at this  link.
  3. Information on site-specific, streamflow exceedance values was taken from a set of USGS streamgages linked to the National Hydrography Dataset (NHD).  This data was used because the entire dataset is more easily accessible than data provided through the USGS StreamStats database.  This data set can be accessed via this  link .  
  4. Quality control codes used with discrete suspended-sediment data are only available for data retrieved for  Data Report 776 (through 2010).  Data collected, uploaded, or not included in that retrieval has not been quality controlled (but has undergone data screening).  
  5. Data on average basin characteristics (such as soil and land-use) was accessed from NHD (version 2) accumulated catchment attribute tables.  This source was used because attributes could be quantified for a much larger number of sediment sites (4,460 of 4,988) than using GAGES II data.  Information on basin characteristics is preliminary and is subject to change.  

Viewing the portal

The sediment portal is best viewed in Google Chrome, Mozilla Firefox, or Internet Explorer version 8 or newer. The portal also works in Safari, but testing has been limited and bugs may occur.

Site Legend

A legend on the lower right-hand side of the map indicates which sites have discrete (blue) and daily (red) suspended-sediment data. The size of each dot is proportional to the number of discrete samples or length of daily record.  To minimize the site legend, click on the blue "Site Legend" box.

Window size

The size of the map and the filters do not adjust automatically to the screen size of you monitor. To adjust the portal to the desired size, hold the control key and use the mouse to scroll forward or backward to increase or decrease the size of the map and data filters. Alternatively, if you are using google chrome, you can adjust using the zoom option located under the "Customize and control google chrome" option located to the right part the address bar.  

Zoom/Pan

To zoom in on (or out from) a portion of the map, either use the zoom bar located to the of the map.  The "+" and "-" keys located at the top and bottom of the bar can be used to zoom in or out one level (respectively).  The "-" symbol located on the bar indicates the current zoom level.  Users can click on a specific zoom level, use the "+" or "-" keys or use the mouse scroll bar to zoom in or out on the mapper.  To pan the map to the right or left, left click on the mouse and pull the map to the right or left or use the arrow keys located above the zoom bar.

How to inspect a data point

Selected data attributes can be inspected by left-clicking on single or groups of points that represent sediment sampling sites.  Upon left-clicking a sampling site, a table appears that shows the station name, the USGS streamgage identifier, drainage area in square miles, the period of discrete sampling and/or daily record (depending upon the site type), the number of discrete samples, and the number of years in which daily data are available.  Click again on the map or table to get the site inspection table to disappear. 

How to use/change base layers and overlays

Various background layers are available to help place sediment sampling sites in context with spatial boundaries (political, environmental, or basin boundaries) and landscape characteristics. A full list of backgrounds is listed open opening the portal; this list can be minimized by clicking on the "+" tab located on the upper-right hand corner blue overlay box. Background layers are characterized as base layers and overlays.

How to filter data

Data filters are designed to allow users to identify and get data for sites of interest. Daily and discrete sediment sampling sites can be filtered using available information on sampling site characteristics, data characteristics, and geospatial boundaries.  Filters can to be used to progressively narrow the population of sediment sampling sites.  For example if a data filter is applied to limit sites to those with 0-50% agricultural land use and by 0-25% urban land use, only those sites are returned with both 0-50% agricultural and 0-25% urban land use.  The tab key or a left-mouse click can be used to enter data in a particular filter. To apply a filter, click the "Apply Filter" button located on the top-right of the portal interface or press the "enter" key on your keyboard.  To reset applied filters, click the "Clear Filter" button located on the top-right of the portal interface.   To return the portal to the initial, default view, click the refresh button on your browser.

Type of data filters

Site characteristic filters

Site characteristic filters are provided to help users select sampling sites based on the size and character of upstream basins.  Available filters include information on reference condition, size of upstream drainage area, soil characteristics, and land-use characteristics of the upstream basin.  Soil and land-use characteristics were obtained by identifying NHD version 2 catchments ( link) upstream from sediment sampling sites, and averaging attributes across the combined drainage area of the upstream catchments.  The accumulated attributes provided in the portal (as well as other attributes for NHD catchments) are preliminary and are subject to change.  These filters are provided for screening purposes only; it is the users responsibility to verify basin characteristic data.

Hydrologic benchmark sites only 

This data filter restricts sampling sites to those contained within the USGS Hydrologic Benchmark Network (HBN).  HBN sites are those which have relatively long-term measurements of streamflow and water quality in areas that are minimally impacted by human activities.  These sites can be useful in evaluating reference conditions for a given geographic setting, basin size, and climate.  More information on the USGS Hydrologic Benchmark Program can be found at this link.

USGS Station ID 

This data filter restricts sampling sites to user-input USGS station IDs.  Station IDs are typically eight digits, but can be 10, 12, or 13 digits.  This filter can be used to select specific site(s) identified when inspecting data points.  If the site has a leading zero, it needs to be entered.  To select multiple sites use a wildcard character such as 123* . 

Drainage area 

This data filter restricts suspended-sediment sampling sites to a user-defined range of upstream drainage area, in square miles.  Differences in sediment transport can be found among sites with different drainage areas because of differences in the sources of flow or sediment, heterogeneity of upstream soils, landscape practices, topography, etc. Drainage area information was first obtained from the USGS NWIS database ( link). If NWIS data were unavailable for a particular site, data were obtained from a set of USGS streamgages linked to the National Hydrography data set ( link).

Soil K-Factor  

This data filter restricts sampling sites to a user-defined range of the average Soil K-Factor (representing soil erodibility) in the basin upstream from sampling sites.  This information is extracted from the U.S. Department of Agriculture's STATSGO database, and can be accessed at this link.  K-factor is a relative index of susceptibility of bare, cultivated soil to particle detachment and transport by rainfall. The minimum, average value for basins in the sediment portal is 0.0837, the maximum is 0.55. 

R-Factor  

This data filter restricts sampling sites to a user-defined range of the average rainfall and runoff "R-Factor" in the basin upstream from sampling sites reported in 100s ft-ton-f in h-1 ac-1 yr-1. This information is obtained from Oregon State University's PRISM database, and can be accessed at this  link.  The minimum, average value for basins in the sediment portal is 2.85, the maximum is 669.72. 

Soil Permeability  

This data filter restricts sampling sites to a user-defined range of the average soil permeability in the basin upstream from sampling sites, reported in inches per hour.  This information is extracted from the U.S. Department of Agriculture's STATSGO database, and can be accessed at this link.   The minimum, average value for basins in the sediment portal is 0.239, the maximum is 14.11. 

Urban Land Use  

This data filter restricts sampling sites to a user-defined range of the average percentage of urban land use in the upstream basin.  This information is taken from the 2006 National Landcover Database (NLCD).  The original data can be accessed at this  link.  Urban land is defined as the sum of NLCD classes 21 (developed, open space), 22 (developed, low intensity), 23 (developed, medium intensity), and 24 (developed, high intensity). The minimum, average value for basins in the sediment portal is 0 percent, the maximum is 100 percent. 

Agricultural Land Use  

This data filter restricts sampling sites to a user-defined range of the average percentage of agricultural land use in the upstream basin of sampling sites.  This information is taken from the 2006 National Landcover Database (NLCD). The original data can be accessed at this  link.  Agricultural land is defined as the sum of NLCD classes 81 (pasture/hay) and 82 (cultivated crops). The minimum, average value for basins in the sediment portal is 0 percent, the maximum is 94.6 percent. 

Forest Land Use  

This data filter restricts sampling sites to a user-defined range of the average percentage of forest land use in the upstream basin of sampling sites.  This information is taken from the 2006 National Landcover Database (NLCD). The original data can be accessed at this  link.  Forest land is defined as the sum of NLCD classes 41 (deciduous forest), 42 (evergreen forest) and 43 (mixed forest). The minimum, average value for basins in the sediment portal is 0 percent, the maximum is 100 percent. 

Data characteristic filters

Data characteristic filters are provided to help users select sampling sites based upon the number of samples and/or years of suspended-sediment sampling.  Currently available filters include information on the minimum years of discrete and daily sampling, as well as on a range of years in which daily or discrete data were collected.

Min Years of Daily Data 

This filter restricts sampling sites to a user-defined minimum of unique years of daily suspended-sediment concentration or load data.  The number of unique years of daily sediment data were tabulated by summing counts of data retrieved from the USGS NWIS system. The minimum number of years is 1, the maximum number of years is 58 (from 1901 through 2014).

Min Discrete Samples

This filter restricts sampling sites to a user-defined minimum number of discrete suspended-sediment concentration samples.  Data were originally retrieved from the USGS NWIS system, and were passed through a screening process described in USGS Data Report 776

Year Range between

This filter restricts sampling sites and the data downloaded to a user-defined range of sampling years. Note that this is the only filter in which both the sites selected and data provided are restricted based on user inputs.  The first year in which data are reported to have been collected is 1901, the last year is 2014.

Boundary filters

Boundary filters are provided to help users to select sampling sites based upon the extent of selected political, environmental, or basin boundaries.  Currently available filters include sediment-sampling-site basins, ecoregions, hydrologic unit code (HUC) watershed boundaries, and states.

USGS Station ID 

This filter restricts sampling sites to those that fall within the extent of user-selected, sampling-site basin.  Single basins can be selected by entering in the USGS station ID for the desired basin.  Basins were retrieved from multiple sources, but were principally from USGS streamgage NHDPlus Version 1 basins ( link).  Additional basins were taken from the GAGES II database ( link), NASQAN network ( link), and via written communication with Mike Wiezcorek (USGS Maryland Water Science Center).  Limited quality control of basin delineations was done by evaluating basin area against USGS NWIS drainage area and NHD V2 accumulated drainage area ( link).  This tool is for data screening only, it is the user's responsibility to verify the size and extent of particular basins.  Basin delineations were identified for 4,408 of the 4,988 daily and discrete suspended-sediment sampling sites.

Ecoregion number

This filter restricts sampling sites to those that fall within the extent of user-selected, U.S. Environmental Protection Agency ecoregion. Level I or level II ecoregions can be selected by their corresponding code using a "Level I Ecoregion"."Level II Ecoregion" format with a possible wild card figure.  For example, 5.* would return all sites in level I ecoregion 5, 5.3 would return sites in level II ecoregion 5.3, 10.2 would return sites in level II ecoregion 10.2.   Enter ecoregion codes without leading zeros. Ecoregions can be viewed via the following link;  ecoregion data used in the portal were retrieved from the following link.

HUC

This filter restricts sampling sites to those that fall within the extent of user-selected hydrologic unit code (HUC) watershed boundaries. Data can be filtered for up to 2, 4, 6, and 8 digit HUCs.  HUC boundaries can be selected by entering 2, 4, 6, or 8 digit HUC codes with a possible wildcard.  The first two numbers correspond to the two digit (Region) watershed boundary.  For example, to select sampling sites by HUC region 10, enter 10*.  Numbers three and four correspond to the four digit (Subregion) watershed boundary.  For example, to select sampling sites by HUC subregion 1003, enter 1003*.  Numbers five and six correspond to the six digit (Basin) watershed boundary.  For example, to select sampling sites by HUC basin 100301, enter 100301*.  Numbers seven and eight correspond to the eight digit (Subasin) watershed boundary.  For example, to select sampling sites by HUC subbasin 10030101, enter 10030101*.  HUCs can be viewed in map form on the following link; the watershed boundary dataset used in the portal was retrieved from the following  link .

States 

This filter restricts sampling sites to those that fall within the extent of user-selected state boundaries (including the territories of Guam and Puerto Rico).  A single state can be selected through selection in the drop-down menu.  After selection, that state can be removed by the "-" symbol to the right of the selected state.  Additional states can then be selected through the drop down menu. State boundaries can be obtained through this link.

Downloading data

Three types of data are available to download, (1) site characteristics, (2) daily data, and (3) discrete data. To download data, first use filters to identify sites of interest (or apply no filters to download the entire dataset) and then click the "Download Data" button located on the top-right hand side of the portal.

Once the "Download Data" button is clicked, a pop-up screen will appear that lets the user choose which data to download, the format of the data, and how the data will be delivered. The user is given the option to download daily flow and sediment data from the U.S. Geological Survey National Water Information System (NWIS) and (or) discrete sediment and related data from the sediment portal.  Information on sampling site characteristics is provided with either of these data downloads by default.  If users select to download discrete sediment data, an option is provided to "Include Daily Flow" box.  Selection of this box will add the daily flow time series from the discrete suspended-sediment data to the daily data file (meaning that the "Daily Flow and Sediment Data" box must also be checked).  A time series of daily flow data is provided along with daily sediment data by default.

Additionally, if users desire only information on sampling site characteristics, they should pick one (or both) of the daily or discrete sample data and select the box labeled "Site Attribute Information Only".  If this checkbox is not selected, users will get both the sample and site characteristic data.   Data can be downloaded in .csv or .tsv format by selecting from the drop down menu next to the “File Format” button.  Users can download data directly to their desktop or  have data sent  to their email by placing an email address in the "Email Address" box.  An email address must be entered for cases in which large numbers of data/sites prohibit a direct download. For more information on any of these options, hover over the "?" located to the right of each option. 

A complete list of fields, field abbreviations, units, and data sources of site characteristic data can be accessed via this   link.  Daily data are a daily time series of mean daily streamflow, mean daily suspended-sediment concentration, and mean daily suspended-sediment data; a complete list of fields, field abbreviations, and of daily sediment data can be accessed via this   link. Discrete data represent periodically collected suspended-sediment and associated data;  complete list of fields, field abbreviations, and of discrete sediment data can be accessed via this  link  .

Table 1. Site data field descriptions, units, and sources

Field name Field description Units Source(s) Applicable to site or basin?
SITE_NO USGS site identifier   NWIS Site
SNAME USGS site name   NWIS Site
LATITUDE Decimal latitude (datum NAD83)   NWIS Site
LONGITUDE Decimal longitude (datum NAD83)   NWIS Site
NWISDA1 Upstream drainage area square miles NWIS/NHD Basin
STATE U.S. State   Link Site
COUNTY_NAME U.S. County   Link Site
ECO_L3_CODE Level III Ecoregion Code   Link Site
ECO_L3_NAME Level III Ecoregion Name   Link Site
ECO_L2_CODE Level II Ecoregion Code   Link Site
ECO_L2_NAME Level II Ecoregion Name   Link Site
ECO_L1_NAME Level I Ecoregion Name   Link Site
ECO_L1_CODE Level I Ecoregion Code   Link Site
HUC_REGION_NAME Hydrologic Unit Code Region Name   Link Site
HUC_SUBREGION_NAME Hydrologic Unit Code Subregion Name   Link Site
HUC_BASIN_NAME Hydrologic Unit Code Basin Name   Link Site
HUC_SUBBASIN_NAME Hydrologic Unit Code Subbasin Name   Link Site
HUC_2 Hydrologic Unit Code Region Code   Link Site
HUC_4 Hydrologic Unit Code Subregion Code   Link Site
HUC_6 Hydrologic Unit Code Basin Code   Link Site
HUC_8 Hydrologic Unit Code Subbasin Code   Link Site
PERM Average soil permeability inches/hour Link Basin
BFI Average baseflow index percent Link Basin
KFACT Average K-factor for the uppermost soil horizon unitless Link Basin
RFACT 30 year rainfall and runoff factor (100’s ft-tonf in h-1 ac-1 yr-1) * 10 Link Basin
PPT30 Mean annual precipitation from 1971-2000 centimeters Link  Basin
URBAN Percentage of urban land (sum of NLCD classes 21, 22, 23, and 24) percent Link Basin
FOREST Percentage of forest land (sum of NLCD classes 41, 42, and 43) percent Link Basin
AGRIC Percentage of agricultural land (sum of NLCD classes 81 and 82) percent Link Basin
MAJ_DAMS Number of dams with >= 50 feet in height or having storage >= 5,000 acre-feet    Link Basin
NID_STOR Dam storage acre-feet Link Basin
CLAY Average percentage of soil clay content percent Link Basin
SAND Average percentage of soil sand content percent Link Basin
SILT Average percentage of soil silt content percent Link Basin
BASIN_NO USGS site identifier for sites in which upstream basins were delineated   Link Basin
BENCHMARK_SITE 1 indicates site is a part of the hydrologic benchmark network   Link Site
nhd.p1 1st percentile of daily flows   Link Site
nhd.p5 5th percentile of daily flows   Link Site
nhd.p10 10th percentile of daily flows   Link Site
nhd.p20 20th percentile of daily flows   Link Site
nhd.p25 25th percentile of daily flows   Link Site
nhd.p30 30th percentile of daily flows   Link Site
nhd.p40 40th percentile of daily flows   Link Site
nhd.p50 50th percentile of daily flows   Link Site
nhd.p60 60th percentile of daily flows   Link Site
nhd.p70 70th percentile of daily flows   Link Site
nhd.p75 75th percentile of daily flows   Link Site
nhd.p80 80th percentile of daily flows   Link Site
nhd.p90 90th percentile of daily flows   Link Site
nhd.p95 95th percentile of daily flows   Link Site
nhd.p99 99th percentile of daily flows   Link Site
SAMPLE_YEARS Number of unique years in which daily suspended-sediment concentration or load data were collected (daily_sites data only)     Site
SAMPLE_COUNT

Number of discrete suspended-sediment samples collected (discrete_sites data only)

    Site

Table 2. Discrete data field abbreviations, descriptions, and units

Field name Field description Units USGS parameter code(s)
SITE_NO USGS site identifier    
STATION_NM USGS site name    
DATETIME Date/time of sample collection (set to local time zone)    
DCOMMENT Quality control comment on the relation of SSC with daily flow    
ICOMMENT Quality control comment on the relation of SSC with instantaneous flow    
SSC Suspended-sediment concentration milligrams per liter 80154
DAILYFLOW Discharge, mean daily cubic feet per second 00060
INSTFLOW Discharge, instantaneous cubic feet per second 00061
GH Gage height feet 00065
P2 Suspended sediment, diameter, percent smaller than 0.002 millimeters. percent 70326; 70337
P4 Suspended sediment, diameter, percent smaller than 0.004 millimeters. percent 70327; 70338
P8 Suspended sediment, diameter, percent smaller than 0.008 millimeters. percent 70328; 70339
P16 Suspended sediment, diameter, percent smaller than 0.016 millimeters. percent 70329; 70340
P31 Suspended sediment, diameter, percent smaller than 0.031 millimeters. percent 70330; 70341
P63 Suspended sediment, diameter, percent smaller than 0.063 millimeters. percent 70331; 70342
P125 Suspended sediment, diameter, percent smaller than 0.125 millimeters. percent 70332; 70343
P250 Suspended sediment, diameter, percent smaller than 0.250 millimeters. percent 70333; 70344
P500 Suspended sediment, diameter, percent smaller than 0.500 millimeters. percent 70334; 70345
P1MILLI Suspended sediment, diameter, percent smaller than 1.0 millimeters. percent 70335; 70346
P2MILLI Suspended sediment, diameter, percent smaller than 2.0 millimeters. percent 70336; 70347
LOI Loss on ignition of total solids, water, unfiltered milligrams per liter 00505
TSS Total solids dried at 105 degrees Celsius, water, unfiltered milligrams per liter 00500
SS Suspended solids, water, unfiltered milligrams per liter 00530
AGENCYCODE Agency analyzing sample NWIS code 00028
SAMPMETHOD Sampling method NWIS code 82398
SAMPLEPURPOSE Sampling purpose NWIS code 71999
SAMPTYPE Sampler type NWIS code 84164
NUMBERSAMPPTS Number of sampling points NWIS code 00063
VISITPURPOSE Site visit purpose NWIS code 50280
WIDTH Stream width feet 00004
VELOCITY Stream velocity feet per second 00055
TURB70 Turbidity, water, unfiltered Jackson Turbidity Units 00070
TURB76 Turbidity, water, unfiltered nephelometric turbidity units 00076
TURB1350 Turbidity, severity code 01350
TURB61028 Turbidity, water, unfiltered, field nephelometric turbidity units 61028
TURB63675 Turbidity, water, unfiltered, broad band light source (400-680 nm), detection angle 90 +/- 30 degrees to incident light nephelometric turbidity units 63675
TURB63676 Turbidity, water, unfiltered, broad band light source (400-680 nm), detectors at multiple angles including 90 +/- 30 degrees, ratiometric correction nephelometric turbidity ratio units 63676
TURB63680 Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +/ -2.5 degrees formazin nephelometric units 63680
TEMPC Temperature, water degrees Celsius 00010
TEMPAIRC Temperature, air degrees Celsius 00020
SC Specific conductance, water, unfiltered, field microsiemens per centimeter at 25 degrees Celsius 00095
SCLAB Specific conductance, water, unfiltered , laboratory microsiemens per centimeter at 25 degrees Celsius 90095
DSS Dissolved solids drived at 105 degrees Celcius, water, filtered milligrams per liter 00515
PH pH, water, unfiltered, field standard units 00400
PHLAB pH, water, unfiltered, laboratory standard units 00403
ENDDATE End date of sample (rarely present; only in the case of composite samples collected over time)    
ENDTIME End time of sample (rarely present; only in the case of composite samples collected over time)    

Table 3. Daily data field abbreviations, descriptions, and units

Field name Field description Units USGS parameter code(s)
agency_cd USGS site identifier    
site_no USGS site name    
datetime Date/time of sample collection    
DAILY_FLOW Discharge, mean daily cubic feet per second 00060
DAILY_FLOW_QUAL Daily flow data qualifier "A" indicates data are approved for publication; "P" indicates data are provisional and subject to revision  
DAILY_SSC Suspended-sediment concentration, mean daily mg/L 80154
DAILY_SSC_QUAL Suspended-sediment concentration data qualifier "A" indicates data are approved for publication; "P" indicates data are provisional and subject to revision  
DAILY_SSL Suspended-sediment load, mean daily tons/day 80155
DAILY_SSL_QUAL Suspended-sediment load data qualifier "A" indicates data are approved for publication; "P" indicates data are provisional and subject to revision  

Future releases of the sediment portal

Discrete suspended-sediment data and site information provide in this portal will be updated annually (currently through June of 2014).  Daily sediment data will be updated daily, but the list of available sites will be updated annually.  The specific schedule of these updates is currently unknown but will be listed in this section of the FAQ.  These updates are not scheduled to include updates to quality control codes, or major improvements to site functionality, types of data served, or geospatial layers provided.  If you are interested in participating in expanding the functionality of the sediment portal, please contact Casey Lee at cjlee@usgs.gov.

Questions or concerns please contact

SedimentPortal_HELP@usgs.gov