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Accumulation Extension

Download & Installation instructions

NHDPlusV2 data is distributed by the major drainage areas of the United States. Within a Drainage Area, the NHDPlusV2 Accumulation Extension components are packaged into compressed files by Vector Processing Unit (VPU).

NHDPlusV2 Distribution Filename Key
V2nn is Version (2) and subversion (nn) of the NHDPlusV2 data model
dd is the drainage area identifier
VPUid is the VPU identifier
RPUid is the RPU identifier
Componentname is the name of the NHDPlusV2 component contained in the file
vv is the data content version, 01, 02, ... for the component
Additional information about the NHDPlusV2 content and distribution format
can be found in the "NHDPlusV2 User Guide"


Download instructions:

Right click on the icon representing your desired download method in the table below and choose "save file to disk."
You may connect to the NHDPlus FTP site (ftp://ftp.horizon-systems.com) with an FTP client. FTP clients are generally faster than file transfer through a browser.

Installation instructions:

NHDPlusV2 data is distributed in compressed files created by 7-Zip (compression software) with a ".7z" extension. While 7-Zip can create files in standard Zip format, the NHDPlusV2 data is stored in a special 7-Zip format which creates even smaller compressed files. This helps preserve disk space and shorten download times.

7-Zip, and other zipping utilities that support ".7z" files, may be used to uncompress the NHDPlusV2 data. 7-Zip is a free utility available at: http://www.7-zip.org/download.html.