Gary Darling  - GISPOffice of the State CIO

Acting Deputy Geographic Information Officer

Melody BaldwinDivision of Flood Management

JOC –FOC GIS Unit

National Hydrography DatasetDrew Decker

USGS Geospatial Liaison for California

Carol Ostergren USGS Geospatial Liaison for California

Watershed Boundary DatasetLorri Peltz-Lewis,

WBD State Coordinator CA & NV

Donna KnifongUSGS, GIS Specialist

Introduction – Gary Darling, Melody Baldwin National Hydrography Dataset (NHD)

Brief History Why use the NHD

Common Operating System/Common Data What is the NHD

Current Structure Units, Scale, Features

Watershed Boundary Dataset (WBD) History of Watershed Data in California California Interagency Watershed Mapping (CalWater 2.2.1) vs. WBD

Where, How to access Sources External DWR Internal

California stewardship for the National Hydrography dataset NHD now at a crossroads

At this point there is no formal steward for the NHD

There are four reasonable stewardship options: Department of water resources DWR The water boards (SWRCB) The office of the CIO (OCIO) A consortium approach

New technologies are making more and better water data available

Increases in information allow us to better manage water resources

Policy makers have become aware of the value of information for decision making

Newly enacted resources management strategies are data intensive…

Simitian SB 7X 1 "Adaptive management" means a framework

and flexible decision making process for ongoing knowledge acquisition, monitoring, and evaluation leading to continuous improvement in management planning…”

  Steinberg SB 7X 3

“…increase opportunities for groundwater recharge and optimization of groundwater supplies.”

Data intensive strategies to work better if you actually have data

We need to create an interagency data gathering process  You are more likely to reach the same conclusions from

data analysis you start with the same information

We need to pick an authoritative source for shared datasets  For multi-agency decision making to be effective

information needs to be shared between agencies within the State and between different levels of government.

Datasets once created need to be maintained and effectively shared

 

Federal financial support makes the NHD the only cost effective hydrology data set.

Once posted to the NHD all Federal agencies accept the posted NHD data as truth

NHD has a high rate of acceptance in local government

For adaptive management policies to enacted some sort of common hydrography layer needs to be established.

All agencies working from the same dataset

Focus on project and not on dataset being used for the project

Metadata for dataset

Regular updates and enhancements

A Map Spatial representation of hydrographic

features, originating from digitization of topographic hydrologic lines

A Network Interconnections between features

A Model A systematic way to link data, visualize

relationships, and make decisions A Standard

Nationally consistent data

Joint USGS/EPA standard Available at 1:100,000 (medium), 1:24,000

(large),

and >1:24,000 (local) scales Contains surface water features including streams

and rivers, ponds, lakes, canals, wetlands, and

springs Features linked to EPA reach code database Data organized by drainage areas

Stream/River Pipelines Ditches/canals Artificial Paths Connectors Underground Conduit Coastline

Lake/pond

Drain Features(reachcode)

The information encoded about these features includes: classification and other characteristics geographic names positions, lengths, and areas; “reach

codes” direction of water flow metadata supports future updates and

improvements to the data

The data support many applications, such as:

Making maps. Positional and descriptive data in the NHD provide the starting point for making many different kinds of maps.

Geocoding observations. Much like street addresses provide a way to link data to a road network, the NHD’s reach codes provide “stream addresses” as a means to link data to water features.

Modeling the flow of waters. Information about the direction of flow, when combined with other data, can help users model the transport of materials in hydrographic networks, and other applications.

Watershed Boundary Data for California

1995 CDF - CalWater Map 1.1

DWR – CalWater 2.0 & 2.2

Mixed watershed & administrative boundaries

US Department of Agriculture, Natural Resources Conservation Service, Watershed Boundary Database

http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/

Cal Water 2.2.1 Today WBD 2009

Certified California WBD 10/2009

The integrated National Hydrography Dataset and Watershed Boundary Dataset to define streams and watersheds.

Fact Sheet 2009-3054Revised September 2009

Using integrated geospatial data and hydrologic modeling to predict streamflow. Line-width is proportional to modeled streamflow.

• NHD Home (nhd.usgs.gov)• NHD Stewardship Home

(webhosts.cr.usgs.gov/steward/)• NHD Standards

(rockyweb.cr.usgs.gov/nmpstds/nhdstds.html)• NHD Plus (www.horizon-systems.com/nhdplus/)• EPA’s Surf Your Watershed

(cfpub.epa.gov/surf/locate/index.cfm)• EPA WATERS (Watershed Assessment, Tracking & Environmental Results - www.epa.gov/waters/)

• Watershed Boundary Dataset (www.ncgc.nrcs.usda.gov/products/datasets/watershed/)

• CalWater Watershed Delineations (www.ca.nrcs.usda.gov/features/calwater/#Data)