Department of Interior hydrologic-unit-codes API

openapi: 3.0.2
info:
  contact:
    name: US Geological Survey - Water Data for the Nation
    url: https://waterdata.usgs.gov
    x-ogc-serviceContact:
      addresses: []
      emails:
      - value: wdfn@usgs.gov
      hoursOfService: pointOfContact
      links:
      - href: https://waterdata.usgs.gov/questions-comments/?referrerUrl=https://api.waterdata.usgs.gov
        type: text/html
      name: WDFN Support
  description: 'These APIs provide OGC-compliant interfaces to USGS water data, letting you download continuous sensor measurements, discrete field measurements, metadata about monitoring locations, and more.

    '
  license:
    name: US Government work in the public domain
    url: https://creativecommons.org/publicdomain/zero/1.0/
  termsOfService: https://creativecommons.org/publicdomain/zero/1.0/
  title: USGS Water Data OGC APIs agency-codes hydrologic-unit-codes API
  version: 0.56.0
  x-keywords:
  - geospatial
  - data
  - api
  - hydrology
  - USGS
servers:
- description: 'These APIs provide OGC-compliant interfaces to USGS water data, letting you download continuous sensor measurements, discrete field measurements, metadata about monitoring locations, and more.

    '
  url: https://api.waterdata.usgs.gov/ogcapi/v0
tags:
- description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

    '
  name: hydrologic-unit-codes
paths:
  /collections/hydrologic-unit-codes:
    get:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: describeHydrologic-unit-codesCollection
      parameters:
      - $ref: '#/components/parameters/f'
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/Collection
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      summary: Get Hydrologic unit codes (HUCs) metadata
      tags:
      - hydrologic-unit-codes
  /collections/hydrologic-unit-codes/items:
    get:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: getHydrologic-unit-codesFeatures
      parameters:
      - description: The optional f parameter indicates the output format which the server shall provide as part of the response document.  The default format is GeoJSON.
        explode: false
        in: query
        name: f
        required: false
        schema:
          default: json
          enum:
          - json
          - html
          - jsonld
          - csv
          type: string
        style: form
      - $ref: '#/components/parameters/lang'
      - $ref: '#/components/parameters/bbox'
      - description: The optional limit parameter limits the number of items that are presented in the response document (maximum=50000, default=10000).
        explode: false
        in: query
        name: limit
        required: false
        schema:
          default: 10000
          maximum: 50000
          minimum: 1
          type: integer
        style: form
      - $ref: '#/components/parameters/crs'
      - $ref: '#/components/parameters/bbox-crs'
      - description: The properties that should be included. The parameter value is a comma-separated list of property names.
        explode: false
        in: query
        name: properties
        required: false
        schema:
          items:
            enum:
            - id
            - hydrologic_unit_name
            - hydrologic_unit_classification_code
            type: string
          type: array
        style: form
      - $ref: '#/components/parameters/skipGeometry'
      - $ref: https://raw.githubusercontent.com/opengeospatial/ogcapi-records/master/core/openapi/parameters/sortby.yaml
      - $ref: '#/components/parameters/offset'
      - description: 'Hydrologic unit code. The format of the code is (''RRSSBBUUWWXX'') where: ''RR'' is the 2-digit code for the region. ''SS'' is the 2-digit code for the sub-region. ''BB'' is the 2-digit code for the basin. ''UU'' is the 2-digit code for the sub-basin. ''WW'' is the 2-digit code for the watershed. ''XX'' is the 2-digit code for the sub-watershed. Watersheds are delineated by USGS using a nationwide system based on surface hydrologic features. This system divides the country into 22 regions (2-digit), 245 subregions (4-digit), 405 basins (6-digit), ~2,400 subbasins (8-digit), ~19,000 watersheds (10-digit), and ~105,000 subwatersheds (12-digit). A hierarchical hydrologic unit code (HUC) consisting of 2 additional digits for each level in the hydrologic unit system is used to identify any hydrologic area (see Federal Standards and Procedures for the National Watershed Boundary Dataset - https://pubs.usgs.gov/tm/11/a3/).'
        explode: false
        in: query
        name: id
        required: false
        schema:
          description: 'Hydrologic unit code. The format of the code is (''RRSSBBUUWWXX'') where: ''RR'' is the 2-digit code for the region. ''SS'' is the 2-digit code for the sub-region. ''BB'' is the 2-digit code for the basin. ''UU'' is the 2-digit code for the sub-basin. ''WW'' is the 2-digit code for the watershed. ''XX'' is the 2-digit code for the sub-watershed. Watersheds are delineated by USGS using a nationwide system based on surface hydrologic features. This system divides the country into 22 regions (2-digit), 245 subregions (4-digit), 405 basins (6-digit), ~2,400 subbasins (8-digit), ~19,000 watersheds (10-digit), and ~105,000 subwatersheds (12-digit). A hierarchical hydrologic unit code (HUC) consisting of 2 additional digits for each level in the hydrologic unit system is used to identify any hydrologic area (see Federal Standards and Procedures for the National Watershed Boundary Dataset - https://pubs.usgs.gov/tm/11/a3/).'
          type: string
        style: form
      - description: Hydrologic unit name.
        explode: false
        in: query
        name: hydrologic_unit_name
        required: false
        schema:
          description: Hydrologic unit name.
          type: string
        style: form
      - description: Hydrologic unit classification code.
        explode: false
        in: query
        name: hydrologic_unit_classification_code
        required: false
        schema:
          description: Hydrologic unit classification code.
          type: string
        style: form
      - $ref: '#/components/parameters/filter'
      responses:
        '200':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/Features
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Hydrologic unit codes (HUCs) items
      tags:
      - hydrologic-unit-codes
    options:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: optionsHydrologic-unit-codesFeatures
      responses:
        '200':
          description: options response
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Options for Hydrologic unit codes (HUCs) items
      tags:
      - hydrologic-unit-codes
    post:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: getCQL2Hydrologic-unit-codesFeatures
      requestBody:
        content:
          application/json:
            schema:
              $ref: https://schemas.opengis.net/cql2/1.0/cql2.json
        description: Get items with CQL2
        required: true
      responses:
        '200':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/Features
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Hydrologic unit codes (HUCs) items with CQL2
      tags:
      - hydrologic-unit-codes
  /collections/hydrologic-unit-codes/items/{featureId}:
    get:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: getHydrologic-unit-codesFeature
      parameters:
      - $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/parameters/featureId
      - $ref: '#/components/parameters/crs'
      - $ref: '#/components/parameters/f'
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/Feature
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Hydrologic unit codes (HUCs) item by id
      tags:
      - hydrologic-unit-codes
    options:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: optionsHydrologic-unit-codesFeature
      parameters:
      - $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/parameters/featureId
      responses:
        '200':
          description: options response
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Options for Hydrologic unit codes (HUCs) item by id
      tags:
      - hydrologic-unit-codes
  /collections/hydrologic-unit-codes/queryables:
    get:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: getHydrologic-unit-codesQueryables
      parameters:
      - description: The properties that should be included. The parameter value is a comma-separated list of property names.
        explode: false
        in: query
        name: properties
        required: false
        schema:
          items:
            enum:
            - id
            - hydrologic_unit_name
            - hydrologic_unit_classification_code
            type: string
          type: array
        style: form
      - $ref: '#/components/parameters/f'
      - description: The profile to be applied to a given request
        explode: false
        in: query
        name: profile
        required: false
        schema:
          enum:
          - actual-domain
          - valid-domain
          type: string
        style: form
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: '#/components/responses/Queryables'
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Hydrologic unit codes (HUCs) queryables
      tags:
      - hydrologic-unit-codes
  /collections/hydrologic-unit-codes/schema:
    get:
      description: 'Hydrologic units are geographic areas representing part or all of a surface drainage basin or distinct hydrologic feature identified by a unique number (HUC), and a name. The United States is divided and sub-divided into successively smaller hydrologic units which are classified into four levels: regions, sub-regions, accounting units, and cataloging units. Each unit consists of two to eight digits based on the four levels of classification in the hydrologic unit system. Additional information can be found at &lthttps://water.usgs.gov/GIS/huc.html&gt.

        '
      operationId: getHydrologic-unit-codesSchema
      parameters:
      - $ref: '#/components/parameters/f'
      - $ref: '#/components/parameters/lang'
      responses:
        '200':
          $ref: '#/components/responses/Queryables'
        '400':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/InvalidParameter
        '403':
          $ref: '#/components/responses/Forbidden403'
        '404':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/NotFound
        '429':
          $ref: '#/components/responses/TooManyRequests429'
        '500':
          $ref: https://schemas.opengis.net/ogcapi/features/part1/1.0/openapi/ogcapi-features-1.yaml#/components/responses/ServerError
      security:
      - ApiKeyQuery: []
      - ApiKeyHeader: []
      summary: Get Hydrologic unit codes (HUCs) schema
      tags:
      - hydrologic-unit-codes
components:
  parameters:
    offset:
      description: The optional offset parameter indicates the index within the result set from which the server shall begin presenting results in the response document.  The first element has an index of 0 (default).
      explode: false
      in: query
      name: offset
      required: false
      schema:
        default: 0
        minimum: 0
        type: integer
      style: form
    skipGeometry:
      description: This option can be used to skip response geometries for each feature.
      explode: false
      in: query
      name: skipGeometry
      required: false
      schema:
        default: false
        type: boolean
      style: form
    f:
      description: The optional f parameter indicates the output format which the server shall provide as part of the response document.  The default format is GeoJSON.  CSV is also available.
      explode: false
      in: query
      name: f
      required: false
      schema:
        default: json
        enum:
        - json
        - html
        - jsonld
        - csv
        type: string
      style: form
    bbox:
      description: Only features that have a geometry that intersects the bounding box are selected.The bounding box is provided as four or six numbers, depending on whether the coordinate reference system includes a vertical axis (height or depth).
      explode: false
      in: query
      name: bbox
      required: false
      schema:
        items:
          type: number
        maxItems: 6
        minItems: 4
        type: array
      style: form
    bbox-crs:
      description: Indicates the coordinate reference system for the given bbox coordinates.
      explode: false
      in: query
      name: bbox-crs
      required: false
      schema:
        format: uri
        type: string
      style: form
    filter:
      description: "CQL Text filter expression.  CQL JSON cannot be used here, only in the body. \nSee also: https://docs.pygeoapi.io/en/latest/cql.html \n\nExample: time_series_id IN ('64ee32f5350a4ec4967435dcd2e364ea', '3e55d9c2d8a54bec9ca5e292b07d5a96')"
      in: query
      name: filter
      required: false
      schema:
        type: string
    crs:
      description: Indicates the coordinate reference system for the results.
      explode: false
      in: query
      name: crs
      required: false
      schema:
        format: uri
        type: string
      style: form
    lang:
      description: The optional lang parameter instructs the server return a response in a certain language, if supported.  If the language is not among the available values, the Accept-Language header language will be used if it is supported. If the header is missing, the default server language is used. Note that providers may only support a single language (or often no language at all), that can be different from the server language.  Language strings can be written in a complex (e.g. "fr-CA,fr;q=0.9,en-US;q=0.8,en;q=0.7"), simple (e.g. "de") or locale-like (e.g. "de-CH" or "fr_BE") fashion.
      in: query
      name: lang
      required: false
      schema:
        default: en-US
        enum:
        - en-US
        type: string
  responses:
    TooManyRequests429:
      content:
        application/json:
          examples:
            rateLimitExceeded:
              summary: Rate Limit Exceeded
              value:
                error:
                  code: OVER_RATE_LIMIT
                  message: You have exceeded your rate limit. Make sure you provided your API key from https://api.waterdata.usgs.gov/signup/, then either try again later or contact us at https://waterdata.usgs.gov/questions-comments/?referrerUrl=https://api.waterdata.usgs.gov for assistance.
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          example: "&ltresponse&gt\n      &lterror&gt\n        &ltcode&gtOVER_RATE_LIMIT&lt/code&gt\n        &ltmessage&gtYou have exceeded your rate limit. Make sure you provided your API key from https://api.waterdata.usgs.gov/signup/, then either try again later or contact us at https://waterdata.usgs.gov/questions-comments/?referrerUrl=https://api.waterdata.usgs.gov for assistance.&lt/message&gt\n      &lt/error&gt\n    &lt/response&gt"
          schema:
            properties:
              response:
                properties:
                  error:
                    properties:
                      code:
                        type: string
                      message:
                        type: string
                    required:
                    - code
                    - message
                    type: object
                required:
                - error
                type: object
            type: object
        text/csv:
          examples:
            rateLimitCsv:
              summary: Rate Limit Exceeded (CSV)
              value: 'Error Code,Error Message

                OVER_RATE_LIMIT,You have exceeded your rate limit. Make sure you provided your API key from https://api.waterdata.usgs.gov/signup/, then either try again later or contact us at https://waterdata.usgs.gov/questions-comments/?referrerUrl=https://api.waterdata.usgs.gov for assistance.'
          schema:
            type: string
        text/html:
          examples:
            rateLimitHtml:
              summary: Rate Limit Exceeded (HTML)
              value: "&lthtml&gt\n      &ltbody&gt\n        &lth1&gtOVER_RATE_LIMIT&lt/h1&gt\n        &ltp&gtYou have exceeded your rate limit. Make sure you provided your API key from https://api.waterdata.usgs.gov/signup/, then either try again later or contact us at https://waterdata.usgs.gov/questions-comments/?referrerUrl=https://api.waterdata.usgs.gov for assistance.&lt/p&gt\n      &lt/body&gt\n    &lt/html&gt"
          schema:
            type: string
      description: Too Many Requests - Rate limit exceeded.
    Queryables:
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/queryables'
      description: successful queryables operation
    Forbidden403:
      content:
        application/json:
          examples:
            missingApiKey:
              summary: Missing API Key
              value:
                error:
                  code: API_KEY_MISSING
                  message: No api_key was supplied. Get one at https://api.waterdata.usgs.gov/signup/
          schema:
            $ref: '#/components/schemas/Error'
        application/xml:
          example: "&ltresponse&gt\n      &lterror&gt\n        &ltcode&gtAPI_KEY_MISSING&lt/code&gt\n        &ltmessage&gtNo api_key was supplied. Get one at https://api.waterdata.usgs.gov/signup/&lt/message&gt\n      &lt/error&gt\n    &lt/response&gt"
          schema:
            properties:
              response:
                properties:
                  error:
                    properties:
                      code:
                        type: string
                      message:
                        type: string
                    required:
                    - code
                    - message
                    type: object
                required:
                - error
                type: object
            type: object
        text/csv:
          examples:
            missingApiKeyCsv:
              summary: Missing API Key (CSV)
              value: 'Error Code,Error Message

                API_KEY_MISSING, No api_key was supplied. Get one at https://api.waterdata.usgs.gov/signup/'
          schema:
            type: string
        text/html:
          examples:
            missingApiKeyHtml:
              summary: Missing API Key (HTML)
              value: "&lthtml&gt\n      &ltbody&gt\n        &lth1&gtAPI_KEY_MISSING&lt/h1&gt\n        &ltp&gtNo api_key was supplied. Get one at https://api.waterdata.usgs.gov/signup/&lt/p&gt\n      &lt/body&gt\n    &lt/html&gt"
          schema:
            type: string
      description: Forbidden - API key is missing or not authorized for this resource.
  schemas:
    queryables:
      properties:
        queryables:
          items:
            $ref: '#/components/schemas/queryable'
          type: array
      required:
      - queryables
      type: object
    Error:
      properties:
        error:
          properties:
            code:
              description: Error code such as OVER_RATE_LIMIT, see https://api.data.gov/docs/developer-manual/#general-web-service-errors
              type: string
            message:
              description: Error message
              type: string
          required:
          - code
          - message
          type: object
      type: object
    queryable:
      properties:
        description:
          description: a human-readable narrative describing the queryable
          type: string
        language:
          default: en
          description: the language used for the title and description
          type: string
        queryable:
          description: the token that may be used in a CQL predicate
          type: string
        title:
          description: a human readable title for the queryable
          type: string
        type:
          description: the data type of the queryable
          type: string
        type-ref:
          description: a reference to the formal definition of the type
          format: url
          type: string
      required:
      - queryable
      - type
      type: object
  securitySchemes:
    ApiKeyHeader:
      description: Providing your API key gives you higher rate limits when querying our APIs. You can obtain an API key at https://api.waterdata.usgs.gov/signup
      in: header
      name: api_key
      type: apiKey
    ApiKeyQuery:
      description: Providing your API key gives you higher rate limits when querying our APIs. You can obtain an API key at https://api.waterdata.usgs.gov/signup
      in: query
      name: api_key
      type: apiKey