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NHDPlus in WATERS


The National Hydrography Dataset (NHD) is a database that interconnects and uniquely identifies the millions of stream segments or reaches that comprise the Nation’s surface water drainage system.  It is based upon the USGS 1988 1:100,000-scale Digital Line Graph (DLG) hydrography dataset integrated with reach-related information from the USEPA Reach File Version 3.0-Alpha release (RF3-Alpha).  The NHD provides a national framework for assigning reach addresses to water quality related entities, such as dischargers, drinking water supplies, streams effected by fish consumption advisories, wild and scenic rivers, Clean Water Act Section 305(b) and 303(d) waterbodies, Designated Uses, etc.  Reach addresses establish the locations of these entities relative to one another within the NHD surface water drainage network in a manner similar to street addresses.  The assignment of reach addresses is accomplished through a process known as reach indexing.

Once linked to the NHD surface water drainage network by their reach addresses, the upstream/downstream relationships of the water quality related entities and any associated information about them can be analyzed using Geographic Information Systems (GIS) software.  A GIS provides a set of computerized analytical and mapping tools that operate on geographic datasets, such as the NHD, land use, soils and population, that are organized in separate layers.  A GIS can also be used to combine NHD-based network analysis with these other GIS layers to help better understand and display their respective effects upon water quality.

Furthermore, since the NHD provides a nationally consistent framework for addressing and analysis, water quality information linked to reach addresses by one organization can be shared with other organizations and easily integrated into many different types of applications to the benefit of all.

The NHD is architected and maintained by the US Geological Survey Exit EPA Disclaimer.  In particular their "NHDinGEO Schema" diagram is highly valuable.  The EPA Reach Address Database maintains a copy of the NHD as provided by NHDPlus.  This copy is formatted to match the current USGS data model and is periodically refreshed from the master NHDPlus database.  RAD event data is then migrated to match any changes in the NHD base hydrology.

NHDPlus Versions in WATERS

A national copy of NHDPlus Exit EPA Disclaimer is stored in the WATERS database for use by services, applications and reporting tools. Below is a table showing the individual NHDPlus regions and datasets that together comprise the current NHDPlus in WATERS.

April 2014

DATASET R01_VERSION R02_VERSION R03N_VERSION
FdrFac 021_01 021_01 021_01
Catchment 021_01 021_01 021_01
WBDSnapShot 021_01 (National) 021_01 (National) 021_01 (National)
NHDPlusSnapShot 021_03 021_03 021_03
NHDPlusAttributes 021_03 021_03 021_02
VPUAttributeExtension 021_02 021_01 021_01
EROMExtension 021_02 021_03 021_02
VogelExtension 021_01 021_01 021_01
Simplified Catchments <NA> <NA> <NA>
DATASET R03S_VERSION R03W_VERSION R04_VERSION
FdrFac 021_01 021_01 021_03
Catchment 021_01 021_01 021_05
WBDSnapShot 021_01 (National) 021_01 (National) 021_01 (National)
NHDPlusSnapShot 021_03 021_03 021_07
NHDPlusAttributes 021_02 021_02 021_08
VPUAttributeExtension 021_01 021_01 021_06
EROMExtension 021_02 021_02 021_07
VogelExtension 021_01 021_01 021_06
Simplified Catchments <NA> <NA> <NA>
DATASET R05_VERSION R06_VERSION R07_VERSION
FdrFac 021_01 021_03 021_01
Catchment 021_01 021_05 021_01
WBDSnapShot 021_01 (National) 021_01 (National) 021_01 (National)
NHDPlusSnapShot 021_05 021_06 021_04
NHDPlusAttributes 021_04 021_06 021_06
VPUAttributeExtension 021_02 021_05 021_02
EROMExtension 021_04 021_05 021_04
VogelExtension 021_01 021_04 021_01
Simplified Catchments <NA> <NA> <NA>
DATASET R08_VERSION R09_VERSION R10L_VERSION
FdrFac 021_01 021_01 021_01
Catchment 021_01 021_01 021_01
WBDSnapShot 021_01 (National) 021_01 (National) 021_01 (National)
NHDPlusSnapShot 021_03 021_04 021_05
NHDPlusAttributes 021_03 021_03 021_08
VPUAttributeExtension 021_01 021_03 021_02
EROMExtension 021_02 021_03 021_05
VogelExtension 021_01 021_01 021_01
Simplified Catchments <NA> <NA> <NA>
DATASET R10U_VERSION R11_VERSION R12_VERSION
FdrFac 021_02 021_01 021_01
Catchment 021_02 021_01 021_01
WBDSnapShot 021_01 (National) 021_01 (National) 021_01 (National)
NHDPlusSnapShot 021_06 021_04 021_04
NHDPlusAttributes 021_06 021_03 021_04
VPUAttributeExtension 021_03 021_02 021_03
EROMExtension 021_05 021_02 021_03
VogelExtension 021_02 021_01 021_01
Simplified Catchments <NA> <NA> <NA>
DATASET R13_VERSION R14_VERSION R15_VERSION
FdrFac 021_01 021_01 021_01
Catchment 021_02 021_01 021_01
WBDSnapShot 021_01 (National) 021_01 (National) 021_01 (National)
NHDPlusSnapShot 021_04 021_04 021_03
NHDPlusAttributes 021_02 021_05 021_04
VPUAttributeExtension 021_02 021_01 021_02
EROMExtension 021_02 021_02 021_03
VogelExtension 021_01 021_01 021_03
Simplified Catchments <NA> <NA> <NA>
DATASET R16_VERSION R17_VERSION R18_VERSION
FdrFac 021_01 021_01 021_01
Catchment 021_01 021_02 021_01
WBDSnapShot 021_01 (National) 021_01 (National) 021_01 (National)
NHDPlusSnapShot 021_05 021_04 021_04
NHDPlusAttributes 021_02 021_04 021_03
VPUAttributeExtension 021_01 021_04 021_02
EROMExtension 021_02 021_05 021_04
VogelExtension 021_01 021_01 021_02
Simplified Catchments <NA> <NA> <NA>

Supplemental NHD Documentation




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