The County’s National Pollutant Discharge Elimination System and State Waste Discharge General Permit (NPDES) permit requires that Pierce County maintain mapping data for all known MS4 outfalls and discharge points. The permit requires basin delineation for all tributary conveyances to all known outfalls and discharge points with a 24-inch nominal diameter or larger, or an equivalent cross-sectional area for non-pipe systems.In September 2016, Pierce County Department of Public Works (County) hired Herrera Environmental Consultants (Herrera) to delineate watershed and drainage basin boundaries in GIS to meet the mapping requirements of the current NPDES Phase I Municipal Stormwater Permit. In 2017, Herrera produced an amendment to the original SOW to assist the County with a) conducting a review of 570 existing mapped outfall and discharge points for accuracy and completeness and b)mapping all remaining outfall and discharge points within Pierce County (excluding cities).Herrera has produced a Technical Memorandum documenting all methods and results entitled “Pierce County Drainage Basin and Watershed Delineation Summary Memorandum” (dated December 28, 2017).Please read the metadata (https://matterhorn.piercecountywa.gov/GISmetadata/pdbswm_watersheds_hec.html) for additional information. Any data download constitutes acceptance of the Terms of Use (https://matterhorn.piercecountywa.gov/disclaimer/PierceCountyGISDataTermsofUse.pdf).

The Watershed Boundary Dataset (WBD) defines the areal extent of surface water drainage to a point, accounting for all land and surface areas. Watershed Boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. The intent of defining Hydrologic Units (HU) for the Watershed Boundary Dataset is to establish a base-line drainage boundary framework, accounting for all land and surface areas. At a minimum, the WBD is being delineated and georeferenced to the USGS 1:24,000 scale topographic base map meeting National Map Accuracy Standards (NMAS). Hydrologic units are given a Hydrologic Unit Code (HUC). For example, a hydrologic region has a 2-digit HUC. A HUC describes where the unit is in the country and the level of the unit."A hydrologic unit is a drainage area delineated to nest in a multi-level, hierarchical drainage system. Its boundaries are defined by hydrographic and topographic criteria that delineate an area of land upstream from a specific point on a river, stream or similar surface waters. A hydrologic unit can accept surface water directly from upstream drainage areas, and indirectly from associated surface areas such as remnant, non-contributing, and diversions to form a drainage area with single or multiple outlet points. Hydrologic units are only synonymous with classic watersheds when their boundaries include all the source area contributing surface water to a single defined outlet point."

The U.S. Geological Survey (USGS), in cooperation with the Illinois Center for Transportation and the Illinois Department of Transportation, prepared hydro-conditioned geographic information systems (GIS) layers for use in the Illinois StreamStats application. These data were used to delineate drainage basins and compute basin characteristics for updated peak flow and flow duration regression equations for Illinois. This dataset consists of raster grid files for elevation (dem), flow accumulation (fac), flow direction (fdr), and stream definition (str900) for each 8-digit Hydrologic Unit Code (HUC) area in Illinois merged into a single dataset. There are 51 full or partial HUC 8s represented by this data set: 04040002, 05120108, 05120109, 05120111, 05120112, 05120113, 05120114, 05120115, 05140202, 05140203, 05140204, 05140206, 07060005, 07080101, 07080104, 07090001, 07090002, 07090003, 07090004, 07090005, 07090006, 07090007, 07110001, 07110004, 07110009, 07120001, 07120002, 071200 ...

Model My Watershed (MMW) is a free web application for modeling the influences of land use and best management practices on stormwater runoff and water quality. The public can access this tool at https://app.wikiwatershed.org/. One component of this tool is a function to define the model domain, or area of interest for analysis and modeling by interactively setting the outlet location and delineating the watershed draining to that location. This functionality has been developed using enhancements to the TauDEM hydrologic terrain analysis software ((http://hydrology.usu.edu/taudem) and includes a tool on the user interface and RESTFul Application Program Interface that accesses backend data generated from NHDPlus Version 2.1 gridded flow directions. The continental US was preprocessed into subwatersheds that include gridded flow directions and the polygon shapefile for the entire watershed draining to the subwatershed outlet. Thus when a point within the domain is input (clicked or entered to RESTFul API), the subwatershed that it falls in is first identified. It is then snapped to the stream by moving down to the first stream (NHDPlus medium resolution stream) encountered along the flow directions. Then the local watershed within the subwatershed is delineated based on subwatershed flow direction grid using an adaptation of the TauDEM gauge watershed function. This local subwatershed is then merged with shapefiles for any upstream watersheds to which it attaches. Small watersheds are delineated within a few seconds, with larger watersheds taking up to 40 s (entire Mississippi). The most time consuming step is the merging and generalization of shape information for display. The polygon that result from this process may be downloaded, and subject to size limitations also entered into the MMW analyze area function to summarize land use, hydrologic soils and other information of interest to hydrologic and water quality modeling within the delineated area. The resulting watershed polygon may also be entered into one of the stormwater or water quality models supported by MMW.

Presentation at 2018 AWRA Spring Specialty Conference: Geographic Information Systems (GIS) and Water Resources X, Orlando, Florida, April 23-25, http://awra.org/meetings/Orlando2018/.

Digital Elevation Models (DEM) are widely used to derive information for the modeling of hydrologic processes. The basic model for hydrologic terrain analysis involving hydrologic conditioning, determination of flow field (flow directions) and derivation of hydrologic derivatives is available in multiple software packages and GIS systems. However as areas of interest for terrain analysis have increased and DEM resolutions become finer there remain challenges related to data size, software and a platform to run it on, as well as opportunities to derive new kinds of information useful for hydrologic modeling. This presentation will illustrate new functionality associated with the TauDEM software (http://hydrology.usu.edu/taudem) and new web based deployments of TauDEM to make this capability more accessible and easier to use. Height Above Nearest Drainage (HAND) is a special case of distance down the flow field to an arbitrary target, with the target being a stream and distance measured vertically. HAND is one example of a general class of hydrologic proximity measures available in TauDEM. As we have implemented it, HAND uses multi-directional flow directions derived from a digital elevation model (DEM) using the Dinifinity method in TauDEM to determine the height of each grid cell above the nearest stream along the flow path from that cell to the stream. With this information, and the depth of flow in the stream, the potential for, and depth of flood inundation can be determined. Furthermore, by dividing streams into reaches or segments, the area draining to each reach can be isolated and a series of threshold depths applied to the grid of HAND values in that isolated reach catchment, to determine inundation volume, surface area and wetted bed area. Dividing these by length yields reach average cross section area, width, and wetted perimeter, information that is useful for hydraulic routing and stage-discharge rating calculations in hydrologic modeling. This presentation will describe the calculation of HAND and its use to determine hydraulic properties across the US for prediction of stage and flood inundation in each NHDPlus reach modeled by the US NOAA’s National Water Model. This presentation will also describe two web based deployments of TauDEM functionality. The first is within a Jupyter Notebook web application attached to HydroShare that provides users the ability to execute TauDEM on this cloud infrastructure without the limitations associated with desktop software installation and data/computational capacity. The second is a web based rapid watershed delineation function deployed as part of Model My Watershed (https://app.wikiwatershed.org/) that enables delineation of watersheds, based on NHDPlus gridded data anywhere in the continental US for watershed based hydrologic modeling and analysis.

Presentation for European Geophysical Union Meeting, April 2018, Vienna. Tarboton, D. G., N. Sazib, A. Castronova, Y. Liu, X. Zheng, D. Maidment, A. Aufdenkampe and S. Wang, (2018), "Hydrologic Terrain Analysis Using Web Based Tools," European Geophysical Union General Assembly, Vienna, April 12, Geophysical Research Abstracts 20, EGU2018-10337, https://meetingorganizer.copernicus.org/EGU2018/EGU2018-10337.pdf.

Each drainage area is considered a Hydrologic Unit (HU) and is given a Hydrologic Unit Code (HUC) which serves as the unique identifier for the area. HUC 2s, 6s, 8s, 10s, & 12s, define the drainage Regions, Subregions, Basins, Subbasins, Watersheds and Subwatersheds, respectively, across the United States. Their boundaries are defined by hydrologic and topographic criteria that delineate an area of land upstream from a specific point on a river and are determined solely upon science based hydrologic principles, not favoring any administrative boundaries, special projects, or a particular program or agency. The Watershed Boundary Dataset is delineated and georeferenced to the USGS 1:24,000 scale topographic basemap.Hydrologic Units are delineated to nest in a multi-level, hierarchical drainage system with corresponding HUCs, so that as you move from small scale to large scale the HUC digits increase in increments of two. For example, the very largest HUCs have 2 digits, and thus are referred to as HUC 2s, and the very smallest HUCs have 12 digits, and thus are referred to as HUC 12s.Dataset SummaryPhenomenon Mapped: Watersheds in the United States, as delineated by the Watershed Boundary Dataset (WBD)Geographic Extent: Contiguous United States, Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, Northern Marianas Islands and American SamoaProjection: Web MercatorUpdate Frequency: AnnualVisible Scale: Visible at all scales, however USGS recommends this dataset should not be used for scales of 1:24,000 or larger.Source: United States Geological Survey (WBD)Data Vintage: January 7, 2025What can you do with this layer?This layer is suitable for both visualization and analysis acrossthe ArcGIS system. This layer can be combined with your data and other layers from the ArcGIS Living Atlas of the World in ArcGIS Online and ArcGIS Pro to create powerful web maps that can be used alone or in a story map or other application. Because this layer is part of the ArcGIS Living Atlas of the World it is easy to add to your map:In ArcGIS Online, you can add this layer to a map by selecting Add then Browse Living Atlas Layers. A window will open. Type "Watershed Boundary Dataset" in the search box and browse to the layer. Select the layer then click Add to Map. In ArcGIS Pro, open a map and select Add Data from the Map Tab. Select Data at the top of the drop down menu. The Add Data dialog box will open on the left side of the box, expand Portal if necessary, then select Living Atlas. Type "Watershed Boundary Dataset" in the search box, browse to the layer then click OK.Questions?Please leave a comment below if you have a question about this layer, and we will get back to you as soon as possible.

Each drainage area is considered a Hydrologic Unit (HU) and is given a Hydrologic Unit Code (HUC) which serves as the unique identifier for the area. HUC 2s, 6s, 8s, 10s, & 12s, define the drainage Regions, Subregions, Basins, Subbasins, Watersheds and Subwatersheds, respectively, across the United States. Their boundaries are defined by hydrologic and topographic criteria that delineate an area of land upstream from a specific point on a river and are determined solely upon science based hydrologic principles, not favoring any administrative boundaries, special projects, or a particular program or agency. The Watershed Boundary Dataset is delineated and georeferenced to the USGS 1:24,000 scale topographic basemap.Hydrologic Units are delineated to nest in a multi-level, hierarchical drainage system with corresponding HUCs, so that as you move from small scale to large scale the HUC digits increase in increments of two. For example, the very largest HUCs have 2 digits, and thus are referred to as HUC 2s, and the very smallest HUCs have 12 digits, and thus are referred to as HUC 12s.Dataset SummaryPhenomenon Mapped: Watersheds in the United States, as delineated by the Watershed Boundary Dataset (WBD)Geographic Extent: Contiguous United States, Alaska, Hawaii, Puerto Rico, Guam, US Virgin Islands, Northern Marianas Islands and American SamoaProjection: Web MercatorUpdate Frequency: AnnualVisible Scale: Visible at all scales, however USGS recommends this dataset should not be used for scales of 1:24,000 or larger.Source: United States Geological Survey (WBD)Data Vintage: January 7, 2025What can you do with this layer?This layer is suitable for both visualization and analysis acrossthe ArcGIS system. This layer can be combined with your data and other layers from the ArcGIS Living Atlas of the World in ArcGIS Online and ArcGIS Pro to create powerful web maps that can be used alone or in a story map or other application. Because this layer is part of the ArcGIS Living Atlas of the World it is easy to add to your map:In ArcGIS Online, you can add this layer to a map by selecting Add then Browse Living Atlas Layers. A window will open. Type "Watershed Boundary Dataset" in the search box and browse to the layer. Select the layer then click Add to Map. In ArcGIS Pro, open a map and select Add Data from the Map Tab. Select Data at the top of the drop down menu. The Add Data dialog box will open on the left side of the box, expand Portal if necessary, then select Living Atlas. Type "Watershed Boundary Dataset" in the search box, browse to the layer then click OK.Questions?Please leave a comment below if you have a question about this layer, and we will get back to you as soon as possible.

ABSTRACT Watershed delineation, drainage network generation and determination of river hydraulic characteristics are important issues in hydrological sciences. In general, this information can be obtained from Digital Elevation Models (DEM) processing within GIS commercial softwares, such as ArcGIS and IDRISI. On the other hand, the use of open source GIS tools has increased significantly, and their advantages include free distribution, continuous development by user communities and full customization for specific requirements. Herein, we present the IPH-Hydro Tools, an open source tool coupled to MapWindow GIS software designed for watershed topology acquisition, including preprocessing steps in hydrological models such as MGB-IPH. In addition, several tests were carried out assessing the performance and applicability of the developed tool, given by a comparison with available GIS packages (ArcGIS, IDRISI, WhiteBox) for similar purposes. The IPH-Hydro Tools provided satisfactory results on tested applications, allowing for better drainage network and less processing time for catchment delineation. Regarding its limitations, the developed tool was incompatible with huge terrain data and showed some difficulties to represent drainage networks in extensive flat areas, which can occur in reservoirs and large rivers.

Multiple research and management partners collaboratively developed a multiscale approach for assessing the geomorphic sensitivity of streams and ecological resilience of riparian and meadow ecosystems in upland watersheds of the Great Basin to disturbances and management actions. The approach builds on long-term work by the partners on the responses of these systems to disturbances and management actions. At the core of the assessments is information on past and present watershed and stream channel characteristics, geomorphic and hydrologic processes, and riparian and meadow vegetation. In this report, we describe the approach used to delineate Great Basin mountain ranges and the watersheds within them, and the data that are available for the individual watersheds. We also describe the resulting database and the data sources. Furthermore, we summarize information on the characteristics of the regions and watersheds within the regions and the implications of the assessments for geomorphic sensitivity and ecological resilience. The target audience for this multiscale approach is managers and stakeholders interested in assessing and adaptively managing Great Basin stream systems and riparian and meadow ecosystems. Anyone interested in delineating the mountain ranges and watersheds within the Great Basin or quantifying the characteristics of the watersheds will be interested in this report. For more information, visit: https://www.fs.usda.gov/research/treesearch/61573Metadata and Downloads

Multiple partners working together developed a multiscale approach for assessing the geomorphic sensitivity of streams and ecological resilience of riparian ecosystems, including meadows, in upland watersheds of the Great Basin to disturbances and management actions. This data publication contains the geospatial data, representative of 2020, resulting from that work. The study area, the Great Basin of North America, includes portions of Nevada, Utah, California, Oregon, and Idaho. Nine shapefiles are included, which provide the seven regions (1) and the mountain ranges (2) identified in the study area, streams within each watershed (3) along with the stream heads (4), longest stream (5), lowest drainage points (6), and the stream head that has the farthest stream distance from the pour point (7), and the valley bottom which is considered the area surrounding the stream that is less than 15 meters above the stream's elevation (8) for each watershed. Also included are the watershed boundaries (9) and additional watershed information related to climate, topography, and wildlife. Also included is an ArcGIS map associated with these shapefiles.The approach builds on long-term work by the research and management partners on the geomorphic sensitivity and ecological resilience of these systems to stressors and disturbances. At the core of the assessments is information on past and present watershed and stream channel characteristics, geomorphic and hydrologic processes, and riparian and meadow vegetation characteristics.

Narragansett Bay, Little Narragansett Bay, and the Southwest Coastal Ponds are the three estuarine study areas under the purview of the Narragansett Bay Estuary Program. This dataset represents the 12-digit hydrologic units (HUC12) that drain, directly and indirectly, to the three estuaries. HUC12 drainage areas were sourced from the U.S. Geological Survey (USGS) Watershed Boundary Dataset (WBD) which contains a nested, hierarchical system of hydrologic units. Hydrologic units define the boundaries of surface water drainage to a given set of outlet points or a dendritic stream network. The boundaries are determined by topographic, hydrologic, and other relevant landscape characteristics. Within the Little Narragansett Bay watershed, NBEP delineated the drainage area for the western portion of Little Narragansett Bay. This area, “Part of Southeast Coastal-Pawcatuck River to Eastern Point,” drains to a smaller outlet than any hydrologic unit available in the WBD. All coastal watershed boundaries were updated with NBEP’s estuarine coastline delineation (for details about NBEP’s coastline delineation, see metadata for BAYS_NBEP2019). This dataset is intended for use in general planning, GIS analysis, and mapping at watershed and subwatershed scales. For more information, please reference the 2017 State of Narragansett Bay & Its Watershed Technical Report (nbep.org).

The Watershed Boundary Dataset (WBD) is a comprehensive aggregated collection of hydrologic unit data consistent with the national criteria for delineation and resolution. It defines the areal extent of surface water drainage to a point except in coastal or lake front areas where there could be multiple outlets as stated by the "Federal Standards and Procedures for the National Watershed Boundary Dataset (WBD)" “Standard” (http://pubs.usgs.gov/tm/11/a3/). Watershed boundaries are determined solely upon science-based hydrologic principles, not favoring any administrative boundaries or special projects, nor particular program or agency. This dataset represents the hydrologic unit boundaries to the 12-digit (6th level) for the entire United States. Some areas may also include additional subdivisions representing the 14- and 16-digit hydrologic unit (HU). At a minimum, the HUs are delineated at 1:24,000-scale in the conterminous United States, 1:25,000-scale in Hawaii, Pacific basin and the Caribbean, and 1:63,360-scale in Alaska, meeting the National Map Accuracy Standards (NMAS). Higher resolution boundaries are being developed where partners and data exist and will be incorporated back into the WBD. WBD data are delivered as a dataset of polygons and corresponding lines that define the boundary of the polygon. WBD polygon attributes include hydrologic unit codes (HUC), size (in the form of acres and square kilometers), name, downstream hydrologic unit code, type of watershed, non-contributing areas, and flow modifications. The HUC describes where the unit is in the country and the level of the unit. WBD line attributes contain the highest level of hydrologic unit for each boundary, line source information and flow modifications.

Narragansett Bay, Little Narragansett Bay, and the Southwest Coastal Ponds are the three estuarine study areas under the purview of the Narragansett Bay Estuary Program. This dataset represents the 10-digit hydrologic units (HUC10) that drain, directly and indirectly, to the three estuaries. HUC10 drainage areas were sourced from the U.S. Geological Survey (USGS) Watershed Boundary Dataset (WBD) which contains a nested, hierarchical system of hydrologic units. Hydrologic units define the boundaries of surface water drainage to a given set of outlet points or a dendritic stream network. The boundaries are determined by topographic, hydrologic, and other relevant landscape characteristics. Within the Little Narragansett Bay watershed, NBEP delineated the drainage area for the western portion of Little Narragansett Bay. This area, “Part of Southeast Coastal-Pawcatuck River to Eastern Point,” drains to a smaller outlet than any hydrologic unit available in the WBD. All coastal watershed boundaries were updated with NBEP’s estuarine coastline delineation (for details about NBEP’s coastline delineation, see metadata for BAYS_NBEP2019). This dataset is intended for use in general planning, GIS analysis, and mapping at watershed and subwatershed scales. For more information, please reference the 2017 State of Narragansett Bay & Its Watershed Technical Report (nbep.org).

The U.S. Geological Survey (USGS), in cooperation with the New Jersey Department of Environmental Protection (NJDEP), prepared hydro-conditioned geographic information systems (GIS) data layers for use in the updated New Jersey StreamStats 2022 application (U.S. Geological Survey, 2022). This update features improvements in base-elevation resolution from 10 meters to 10 feet and stream centerline hydrography from 1:24,000 to 1:2,400 scale. Hydro conditioning is the process of burning single-line stream centerlines at the 1:2,400 scale into a digital elevation model to produce flow direction and flow accumulation grids. This data release contains raster digital datasets for a 10-foot digital elevation model, a flow direction grid, and a flow accumulation grid for the updated New Jersey Streamstats 2022 application. The eleven 8-digit Hydrologic Unit Codes (HUCs) represented by this dataset are 02020007, 02030103, 02030104, 02030105, 02040104, 02040105, 02040201, 02040202, 02040206, 02040301, and 02040302 (U.S. Geological Survey, 2016). The updated New Jersey StreamStats 2022 application provides access to spatial analytical tools that are useful for water-resources planning and management, as well as engineering and design purposes. The map-based user interface can be used to delineate drainage areas, determine basin characteristics, and estimate flow statistics, including instantaneous flood discharge, monthly flow-duration, and monthly low-flow frequency statistics for ungaged streams. References cited: U.S. Geological Survey, 2016, National Hydrography: U.S. Geological Survey, accessed February 4, 2022, at https://www.usgs.gov/national-hydrography. U.S. Geological Survey, 2022, StreamStats v4.6.2: U.S. Geological Survey, accessed February 4, 2022, at https://streamstats.usgs.gov/ss/.

A new data set of watersheds and river networks is available, being derived primarily from the TerrainBase Global DTM (Digital Terrain Model) with additional information from the CIA World Data Bank II. These data are useful in hydrologic modeling, and can serve as a basemap for routing continental runoff to the appropriate coast, and therefore into the appropriate ocean or inland sea in a variety of methods. Using this data set, the runoff produced in any grid cell, when coupled with a routing algorithm, can easily be transported to the appropriate water body and distributed across that water body as desired. The data set includes watershed and flow direction information, as well as supporting hydrologic data at 5 minute, 1/2 degree, and 1 degree resolutions globally.

The dataset is composed of nine spatial layers, each delineated at 3 resolutions. These layers include:

Land/Sea Mask -- Determined from TerrainBase DTM elevation data after conversion to GIS format. Some manual correction was also performed in land areas with elevations below sea level.

Flow Direction Data -- Derived from the filled digital elevation model produced from the land/sea mask and the TerrainBase DTM using GIS. Elevation data conditioned before filling by burning in rivers from the CIA World Data Bank II with subsequent manual corrections for discrepancies between model coastlines. Flow direction data in Antarctica altered to ensure valid flow direction information.

Flow Accumulation Data -- Derived from the flow direction data in GIS after correction.

Rivers Delineation -- Created from flow accumulation data based on threshold values using GIS. Greenland and Antarctica removed from river delineation.

55 Large Watersheds Delineation -- Derived from flow direction and flow accumulation data using GIS. Watershed selection conducted as combination of largest watersheds and those rivers suggested by Russell and Miller [1990] for use in global climate modeling studies.

Internally Draining Regions -- Defined as those large regions of Africa, central Eurasia, and Australia which were internally draining. Derived using GIS based on the original elevation data and closed depressions.

19 Large-Scale Drainage Regions -- Derived as watersheds from the flow direction data in conjunction with coastal cells in GIS. The 19 basins were originally selected as land-water body pairings for use in the National Center for Atmospheric Research (NCAR) Climate System Model (CSM).

19 Large-Scale Drainage Regions Including Water Bodies -- 19 large-scale drainage regions including water bodies were derived by computing nearest neighbor data values for grid cells without data values in GIS. Artificial divisions have been included in some areas as they are common geographic modeling divisions, or otherwise create a better separation of drainage regions.

Lakes Delineation -- Created in GIS by gridding water bodies from the CIA World Data Bank II.

Runoff Data -- Runoff data was taken from Perry et al. [1996] and UNESCO [1974] for the 55 rivers selected in this study. ASCII data file data (tabular) with associated geographic and political reference information.

Technical reports describing data analysis and integration are online at [http://www.ngdc.noaa.gov/seg/cdroms/graham/graham/graham.htm].

Upper East sub-basins constructed 10/7/2016 using 10m digital elevation model obtained from the United States Geological Survey (USGS) National Elevation Data set (NED) and ArcGIS Hydrology tool box (ESRI v 10.3.1). Sub-watersheds are delineated as area contributing flow to SFA 2016 stream gage locations. Shapefile attributes include sub-basin ID, name, area (m2 and km2) and codes for spatial contributions to EBC and PH used by Carroll et al. (2018). Geospatial reference is UTM 1983 zone 13. JPEG image provided to show sub-basin delineation with respect to surface geology (Gothic Quadrangle: Gaskill et al., 1991; Maroon Bells Quadrangle: Bryant, 1969).

This data release includes GIS datasets supporting the Colorado Legacy Mine Lands Watershed Delineation and Scoring tool (WaDeS), a web mapping application available at https://geonarrative.usgs.gov/colmlwades/. Water chemistry data were compiled from the U.S. Geological Survey (USGS) National Water Information System (NWIS), U.S. Environmental Protection Agency (EPA) STORET database, and the USGS Central Colorado Assessment Project (CCAP) (Church and others, 2009). The CCAP study area was used for this application. Samples were summarized at each monitoring station and hardness-dependent chronic and acute toxicity thresholds for aquatic life protections under Colorado Regulation No. 31 (CDPHE, 5 CCR 1002-31) for cadmium, copper, lead, and/or zinc were calculated. Samples were scored according to how metal concentrations compared with acute and chronic toxicity thresholds. The results were used in combination with remote sensing derived hydrothermal alteration (Rockwell and Bonham ...

This geospatial dataset is a hydrologic unit boundary layer for the Watershed (10-digit) level. The dataset is a subset of the 5th level (field) hydrologic unit boundaries from the Watershed Boundary Dataset (WBD) layer for Oregon. Hydrologic units in the data set represent drainage areas delineated to the 5th level drainage systems. Their boundaries are defined by hydrographic and topographic criteria that delineate an area of land upstream from a specific point on a river, stream, or similar surface waters. Boundaries within the this data set were delineated by Pacific Northwest (PNW) Hydrography Framework Partners and Natural Resources Conservation Service (NRCS) to meet state requirements and to contribute to the national WBD repository. To meet these goals, the WBD must adhere to the "Federal Standards for Delineation of Hydrologic Unit Boundaries", dated October, 2004. These boundaries were made from the Oregon and Washington datasets that have been nationally certified by Natural Resources Conservation Service (NRCS) Prior to submission the dataset was subjected to an iterative review and edit process to ensure that the hydrologic boundaries fully satisfy the federal standards. This work was completed under a Memorandum of Understanding between the Pacific Northwest Hydrography Framework Partnership, NRCS and the US Geological Survey (USGS). The current dataset includes 5th level boundaries that are in all 4th level (8-digit) subbasins that fall within or the four county Metro region. This data was originally downloaded from the PNW Hydrography Framework Clearinghouse (http://hydro.reo.gov/hu.html). Date of last data update: 2009-01-31 This is official RLIS data. Contact Person: Christine Rutan christine.rutan@oregonmetro.gov 503-797-1669 RLIS Metadata Viewer: https://gis.oregonmetro.gov/rlis-metadata/#/details/2102 RLIS Terms of Use: https://rlisdiscovery.oregonmetro.gov/pages/terms-of-use

The polygons in this layer delineate headwater-to-saltwater drainage basins of the Southeast Alaska Drainage Basin (SEAKDB) which includes the Alaska portion of the perhumid coastal temperate rainforest (PCTR). All geoprocessing was performed using ESRI ArcGIS version 9.3.1 or 10.x. This data set was derived from 4 main sources:1) The United States Geological Survey's (USGS) digital Watershed Boundary Dataset (WBD). The boundaries in the WBD were mapped at the subwatershed (12-digit) 6th level ("HUC12"). Citation for this data source: Coordinated effort between the United States Department of Agriculture-Natural Resources Conservation Service (USDA-NRCS), the United States Geological Survey (USGS), and the Environmental Protection Agency (EPA). The Watershed Boundary Dataset (WBD) was created from a variety of sources from each state and aggregated into a standard national layer for use in strategic planning and accountability. Watershed Boundary Dataset for Alaska. Available URL: "http://datagateway.nrcs.usda.gov" [Accessed March 9, 2012]. 2)British Columbia's Corporate Watershed Base (CWB) Freshwater Atlas Watershed Groups digital dataset (FWWTRSHDGR), downloaded from GeoBC on 3/14/2012. This site has since been replaced by DataBC. Freshwater Atlas documentation can be downloaded from ftp://ftp.geobc.gov.bc.ca/pub/outgoing/FreshWaterAtlasDocuments/FWAv1.3-SDE.WarehouseModelSpecification.rev3.doc. Metadata details can be found at https://apps.gov.bc.ca/pub/geometadata/metadataDetail.do. 3) At the USGS HUC8 (8-digit) and Canada NHN 4-digit drainage levels (CAN4), trans US-Canada watershed boundaries are consistent with the US-Canada hydrographic data harmonization revisions made as of 11/29/2012 (http://datagateway.nrcs.usda.gov). See nhd.usgs.gov/Canada-US_Hydro_Harmonization.pdf for more information on this project. 4) At drainage levels finer than HUC8/CAN4, screen digitizing was used to match up watershed boundaries crossing the Canada-US boundary. The best of availble source material was used for digitizing, including contours generated from USGS 2-arc second (~50 meter) NED DEMS, SPOT 20-meter DEMs, Environment Yukon 30-meter DEMs, and BC TRIM 25-meter DEMs; Tongass National Forest color and black and white orthophotography, satellite imagery obtained from the US Forest Service, Google Earth satillite imagery, and 1:63,360 USGS topographic maps. After a seamless watershed coverage was created using the above 4 sources, subbasins were "aggregated up" (i.e., merged) to depict entire headwater to saltwater drainages. Watersheds were clipped using an Identity operation to an approximate mean high water (MHW) shoreline where NOAA National Shoreline data (through 2011) existed. Where NOAA MHW data was absent, the high water line is represented using other shoreline digital data sources from the US Forest Service (feature class "Intertidal_PL", description=LND) and the US National Park Service (shapefile "HHTide"), and the US National Hydrography Dataset (NHD). In addition, heads up digitizing was necessary where shore recources were absent, of poor quality, or where the previously listed sources needed to be edge-matched. Data sources for digitizing include the US DEMs and orthophotos listed above under #4, 30-meter ASTER DEMs, Google Earth imagery, and US Forest Service 1:15,840 aerial photography stereo-pairs, All multi-part features were converted to single-part. Island polygons less than 10 hectares were deleted. All islands less than 100 hectares are considered a single watershed. If islands less than 100 hectares were mapped in the WBD as more than one watershed, the boundaries were merged.UPDATE, 5/11/2017: Portions of the Alsek drainage boundary were edited using updated digital boundaries obtained from Janet Curran at the USGS. The updates were a part of a flood frequency report (USGS SIR 2016-5024) and StreamStats project.

Cet ensemble de données fournit les limites des bassins versants dérivés du LiDAR pour toutes les îles Calvert et Hecate, en Colombie-Britannique. Les bassins versants ont été délimités à partir d'un modèle altimétrique numérique de 3 m. Pour chaque polygone de bassin versant, le jeu de données comprend un identificateur unique et des statistiques sommaires simples pour décrire la topographie et l'hydrologie. Polygones de bassin versant Cet ensemble de données a été produit à partir des résultats de la modélisation hydrologique « traditionnelle » menée à l'aide du MNT de terre nue complet topographiquement complet basé sur lidar de 2012 + 2014 avec une zone tampon de 10 m autour de la côte pour s'assurer que tous les bassins versants modélisés atteignent l'océan. Les bassins versants ont été délimités à l'aide de points d'coulée créés à l'intersection des cours d'eau modélisés et du littoral. Après la délimitation du bassin versant, ceux-ci ont été coupés sur le rivage de l'île.