Most Popular Files Newest Files
Home File Sources FAQ Contact Privacy Policy
Public Domain Files

Public Domain Picture: July 26, 2012 Tough, but expected visibility for Elwha River Study

Courtesy: US Environmental Protection Agency
Views: 508 | Downloads: 1
July 26, 2012 Tough, but expected visibility for Elwha River Study
Public Domain Mark
This work, identified by, is free of known copyright restrictions.
July 26, 2012 Tough, but expected visibility for Elwha River Study
The freshwater silt plume being released from the Elwha River now that the dams are coming down casts a 'cloud' over areas near the river mouth. As the current changes direction in the Strait, the 'cloud' moves back and forth to various areas, limiting light penetration to the bottom. The measurement tape, shown here is called a 'transect' and is used to ensure that the permanent monitoring stations are surveyed consistently. Divers surveyed from 10 to 40 meters on the transect at a one meter width on either side. This ensures that results are compared year to year from the same area, to give statistically representative data on any changes that may occur as a result of the dam removal. Photo of Nancy Elder, USGS, reeling in her transect tape after completing an invertebrate count at a survey station. See more photos and ask questions of EPA Divers at
Date Added:
April 30, 2014
Download: Largest
Size: 960 x 540
File size: 17.8 KB
File type: jpg
Download: Small
Size: 958 x 539
File size: 22.9 KB
File type: jpg
Public Domain

Why is this picture in the Public Domain?

Produced by United States Government
The file available on this page is a work of the United States government. A work of the United States government, as defined by United States copyright law, is "a work prepared by an officer or employee of the U.S. government as part of that person's official duties." In general, under section 105 of the Copyright Act, such works are not entitled to domestic copyright protection under U.S. law.
US Environmental Protection Agency

Where is this picture from?

US Environmental Protection Agency (Flickr Photostream)
External Site: US Environmental Protection Agency
View more information & files

How may I use a Public Domain picture?

The file available on this page in the Public Domain. Files in the public domain have no restrictions on use and may be used for any purpose, without any conditions, commercial or not, unless such conditions are required by law.
Possible Prohibited Uses
Although a file is in the public domain, the work may still have some restrictions for use if it contains any of the following elements: Files containing any of the above elements that do not also have a provided release would generally fall under editorial uses only and may not be used for commercial purposes. Users downloading files that are designated as "editorial use" assume full responsibility for their use of the file(s). Depending on your use, the use of editorial use files may require additional rights that or the copyright owner may or may not be able to provide. You should consult with your legal counsel to be sure your use is legal.
Download Agreement
By downloading this file, you indicate that you understand and agree to all of these terms and assume full liability for your use of the file(s) and agree to hold harmless should any liability arise.
Home | File Sources | Frequently Asked Questions | Contact Us | Privacy Policy | © 2012-2014