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CalWater and The California Watershed Boundary Database


CalWater, the map, is the 'official' California Watershed dataset, delineating ... Elevation Dataset, and National Hydrography Dataset inherently are related. ... – PowerPoint PPT presentation

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Title: CalWater and The California Watershed Boundary Database

CalWaterand The California Watershed Boundary
  • Robyn Myers, Chair, CalWater Committee, Natural
    Resources Conservation Service, Davis, CA
  • Lorri Peltz-Lewis, Western States WBD
    Coordinator, US Bureau of Reclamation,
    Sacramento, CA
  • Status Report January 2004

What is CalWater?
  • CalWater, the map, is the official California
    Watershed dataset, delineating hydrologic units
    on the landscape.
  • There have been 3 versions to date
  • CalWater 1.0
  • CalWater 2.0
  • CalWater 2.2
  • CalWater, the committee, is the Interagency
    Watershed Mapping Committee formed a decade ago
    to plan, delineate, manage and distribute the
    CalWater maps.
  • An MOU of State and Federal Agencies supports
    cooperative efforts.

CalWater 2.0
  • Current Version is CalWater 2.0 completed in 1999
  • Four levels of watersheds
  • California State System for naming and numbering
  • California watershed hierarchy (differs from

History of Early Watershed Mapping Efforts in
  • 1978 USGS 1500,000 National Hydrologic Unit Maps
    small scale map with large sub-divisions not
    well suited for local use.
  • Watersheds were defined using an inter-agency
    standard developed by NRCS.
  • 8-digit HUCS commonly used as watersheds.
  • 1995 CDF digital watershed map of California with
    administrative and political boundaries for legal

USGS Hydrologic Unit Maps
  • 1978 USGS published the National Hydrologic Unit
    Maps at 1500,000 scale for each state
  • 21 Regions were divided down to 2,149 Cataloging
  • Each has its own Hydrologic Unit Code
  • In California these are often referred to as
    8-digit HUCs.
  • Represented a Federal Interagency effort at the
  • These maps are still available on-line from USGS
  • Represents the Federal System of Watershed
    Delineation and Watershed Hierarchy

CDF Initiates CalWater
  • In 1995 Interagency Watershed Mapping Committee
    used CDFs 1995 digital watershed map as a place
    to begin.
  • CalWater 1.1 was delineated down to 3,000-10,000
    acres watersheds.
  • State naming and numbering system, and watershed
    size definitions were completely different than
    the Federal System.

State Agencies Lead the Development of CalWater
  • DWR took over coordination of the CalWater effort
    resulting in CalWater Versions 2.0 and 2.2
  • CalWater 2.0
  • CalWater 2.2
  • Cross-walk to Federal Hydrologic Units in table
  • Interagency MOU created by the Interagency
    Watershed Mapping (CalWater) Committee

Federal Agencies Take Lead in CalWater Effort
  • USDA-NRCS and the USGS take lead Nationally for
    WBD Watershed Boundary Database
  • USDA-NRCS and the USGS take lead in California to
    lead the CalWater interagency watershed mapping
  • To bring CalWater into compliance with the FGDC
    standards for the National WBD Watershed
    Boundary Database

CalWater MOU Agencies
An Interagency CalWater MOU for the use,
management, and maintenance of a common watershed
map of California.
  • U.S. Forest Service (USFS)
  • U.S. Geological Survey (USGS)
  • U.S. Environmental Protection Agency (USEPA)
  • U.S. Department of Agriculture Natural Resources
    Conservation Service (USDA-NRCS)
  • U.S. Bureau of Reclamation (USBR)
  • U.S. Bureau of Land Management (BLM)
  • California Department of Water Resources (DWR)
  • California Department of Forestry and Fire
    Protection (CDF)
  • California Department of Fish and Game (DFG)
  • State Water Resources Control Board (SWRCB),

The CalWater MOU is -
  • A commitment by all involved agencies to
  • reference the CalWater delineations for resource
    management and planning studies
  • for environmental assessment, analysis, and
    regulatory purposes
  • for presentations of resource information and
    interagency communications
  • and as the base for future mapping and modeling
    activities related to watershed management.

CalWater 2.2 The Official California Watershed
  • Version 2.2 completed in 1999 Currently the
    official data set
  • Six levels of watersheds, down to the detailed
    Planning Watershed
  • California State System for naming and numbering
  • California watershed hierarchy
  • Cross-walked to Federal system

CalWater 2.2 Hierarchy
  • Watershed Level Sq Miles
  • Hydrologic Region (HR) 12,735 sq miles /
    8,150,000 acres
  • Hydrologic Unit (HU) 672 sq miles / 430,000
  • Hydrologic Area (HA) 244 sq miles / 156,000
  • Hydrologic Sub-Area (HSA) 195 sq miles /
    125,000 acres
  • Super Planning Watershed (SPWS) 78 sq miles
    / 50,000 acres
  • Planning Watershed (PWS) 5-16 sq miles /

This Hierarchy and Naming/Numbering System is the
California System and does not correspond
directly to the Federal System used in the WBD.
Problems with CalWater 2.2
  • Does not meet the FGDC watershed boundary
    requirements for watershed delineation.
  • Contains administrative and political boundaries
    in watersheds.
  • It does not contain the Federal watersheds.
  • Central Valley watersheds stop at 500 foot
    contour or geologic contact.
  • But it is currently the best (only) available

The National Watershed Boundary Dataset
  • Federal agencies coordinating spatial water data
    have identified the development of a National
    Watershed Boundaries Data Set as a top priority
    for inclusion in the National Spatial Data
    Infrastructure (NSDI).
  • The proposed NSDI Watershed Boundaries Data Set
    will have the following key characteristics
  • Nationally consistent digital data set
  • Nested subdivisions of established Cataloging
  • 5-15 Watersheds per Cataloging Unit
  • Boundaries based on 124,000-scale topographic
  • Hydrologically based watersheds, not political
  • 10-digit Hydrologic Unit Codes
  • Formally established watershed names
  • Attribute information to identify all upstream
    downstream units

More About the WBD
  • Where watershed boundaries have not already been
    mapped using FGDC guidelines, new watershed
    boundaries will be developed via local watershed
    workshops, or where appropriate, using a
    semi-automated procedure based on elevation data
    from the National Elevation Dataset.
  • The boundaries will be checked and edited using
    124,000-scale Digital Raster Graphics.
  • The National Watershed Boundaries Data Set, the
    National Elevation Dataset, and National
    Hydrography Dataset inherently are related. Early
    maintenance efforts will seek to identify
    inconsistencies between these three data sets and
    use those inconsistencies to help improve the
    quality of each national data set.

Difference between a Watershed and a Hydrologic
  • Classic Watershed is defined as a land and
    water area that has all the surface drainage
    within its boundary converging to a single
    point. (FGDC 2002)
  • Once created, there will be remaining remnant
    areas, non-contributing area and diverted
  • Hydrologic Units can be any drainage area
    delineated to nest in a multi-level,
    hierarchical drainage system and can accept
    surface water directly from upstream drainage
    areas and indirectly from associated surface
    areas to form a drainage area with a single or
    multiple outlet points. (FGDC 2002)
  • Hydrologic Units and Classic Watersheds are the
    same only when their boundaries include all the
    source area contributing surface area to a single
    defined outlet point. (FGDC 2002)

California Work on the Watershed Boundary
Database (WBD)
  • California efforts with respect to the National
    Watershed Boundary Dataset (WBD)
  • Following FGDC guidelines hydrologically
    correct watersheds
  • Nested watershed hierarchy (Federal System)
  • Improves old USGS Hydrologic Unit Maps
  • The WBD will be available nationally on the
    National WBD website.

National WBD Procedure
  • Review Procedure (FGDC Guidelines)
  • State Coordinator submit completed dataset
    (linework and names) to NCGC
  • Review Committee checks dataset (pass/fail)
  • Problems fed back to state until dataset passes
  • State makes final corrections and submits dataset
    and FGDC metadata
  • Dataset accepted and integrated
  • Official release as National WBD

National WDB Status
WBD New Names and Numbers
  • Level 1 - Region 2-digit HUC
  • Level 2 - Subregion 4-digit HUC
  • Level 3 - Basin 6-digit HUC (was "accounting
  • Level 4 - Subbasin 8-digit HUC (was "cataloging
  • Level 5 - Watershed 10-digit HUC (was 11-digit
    in NRCS)
  • Level 6 - Subwatershed 12-digit HUC (was
    14-digit in NRCS)
  • For local planning and mapping purposes,
    California plans to extend the watershed
    hierarchy down two more levels, to include Levels
    7 and 8.
  • This will require additional funding and
    commitment to complete.

WDB Hierarchy
Watershed Delineation Workshops
  • To move towards these goals, over the last three
    years the CalWater committee has completed SEVEN
    Watershed Delineation Workshops
  • Workshop 1 Portland (May - June 2001)
  • Workshop 2 Sacramento (December 2001)
  • Workshop 3 Fresno (March 2002)
  • Workshop 4 Shasta (June 2002)
  • Workshop 5 Reno (November 2002)
  • Workshop 6  San Bernardino (March 2003)
  • Workshop 7 San Francisco Bay Area (August 2003)

Watershed Workshops
  • Have been held in areas through-out the state
  • Invited local participation for hands on heads
    up delineation
  • Participants debate and decide literally where
    to draw the line

Watershed Workshops Draft Linework Completed
Delineation Workshops and Draft Linework to Date
DRAFT WBD Watersheds
Draft Watershed Delineations from Workshops
through August 2003.
  • Seven workshops held throughout state
  • Most of the State has had a first pass
  • In-kind donations of staff time, equipment,
    hardware and software from CalWater MOU agencies.
  • in funding from USGS, BLM, NRCS, and USFS

2004 Work Plan
  • Review Draft-lines completed in Workshops 1-6,
    returned from Contractor
  • Edit to get on contour and on pour point
  • Complete editing and attributes for 4th Level
  • Submit for USGS/NRCS Review
  • Public Pre-Release to generate interest and
  • Train additional Committee Members in
    Delineation, Review and Attribute Development
  • Hold additional workshops for 5ths and 6th
  • Complete review, editing and attributes for 5th
    and 6ths
  • Submit for USGS/NRCS Review
  • Public Release of Completed California WBD
  • Simultaneously seek funding to support these

The Future CalWater 3.0
  • The CalWater committee has agreed to use the WBD
    standards and watershed linework in the next
    version of CalWater.
  • The CalWater 3.0 will be the WBD watershed
    delineations, with the CalWater 2.2 names and
    numbers included in the attribute table.
  • CalWater 3.0 will require a lot of
    behind-the-scenes GIS work to complete.

  • WBD Viewable version for review purposes via
    ArcIMS Image Server (Spring 2004)
  • WBD Level 4 pre-release after FGDC review (Fall
  • WBD available on National WBD website, and
    CaSIL (ETA Early 2005)
  • CalWater 3.0 WBD linework with both Federal WBD
    and California State watershed names and numbers.
    (Late 2005)
  • Web based Watershed map, clickable to find your
    watershed by name and number. (2006)
  • Legacy data CalWater 2.0 and 2.2 will continue
    to be available. (Currently on CaSIL)

What Do We Need to Get There?
  • Funding
  • Staff time (i.e. )
  • ArcSDE Server and Programmer ()
  • Updates and Maintenance of dataset
  • Storage and distribution
  • Data Stewardship
  • Next Meeting January 30th, 2004 NRCS,
    Davis, CA Contact Robyn or Lorri!!

CalWater Website
  • More information can be found at the CalWater
    Watershed web site http//
  • (Not to be confused with the Cal-Fed California
    Bay-Delta Authoritys URL http//
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