Click on the following files to download short (10-30 second) video clips of sampling activities for the Albemarle-Pamlico Drainage study of the National Water-Quality Assessment (NAWQA) Program. Currently, the video clips are formated only for PC AVI and Mac quicktime and will run only with the appropriate plugins. Although these video clips are short and of low resolution, the digital files are large (800-2000 kb) by Web standards, so please be patient during the download.
If you would like VHS tape copies of the original video, please contact Douglas Harned at 919-571-4024. Tapes of the sampling activities can be provided for a fee.
Ground-water and surface-water sampling-- (1.7 mb quicktime) Ground-water sampling from the streambed and instream sampling to identify the sources of inputs of nutrients into Pete Mitchell Swamp.
Cone splitter-- (.8 MB quicktime) Device used to split surface-water samples into 10 subsamples. Also called the decapod splitter, this device is constructed entirely of Teflon to minimize sample contamination.
Measuring alkalinity-- (378 KB avi) Field measurement of alkalinity using a digital tritrometer.
Measuring alkalinity-- (648 KB quicktime)
Sample filtering-- (383 KB avi) Filtering a surface-water sample. Sample filtering for nutrients, major ions, and alkalinity is done inside a plastic bag to isolate the sample from the environment and protect it from contamination.
Sample filtering-- (792 KB quicktime)
Bed-sediment sampling-- (1.3 MB avi) Bed-sediment sampling at Swift Creek, N.C. Areas with fine sediment deposits are selected and sampled using a Teflon corer; the water is carefully decanted, and the sample is composited. These samples were analyzed for a suite of pesticides and trace elements.
Bed-sediment sampling-- (1.6 MB quicktime)
Bed-sediment processing-- (1 MB avi) Processing bed sediment from a composited stream sample. A subsample of the stream sample is pushed through a 2-mm stainless-steel sieve using a Teflon stirrer. The resultant subsample is then chilled and shipped to the U.S Geological Survey Central Laboratory in Denver, Colorado, for organic analysis.
Bed-sediment processing-- (1.7 MB quicktime)
Macroinvertebrate sampling-- (1.8 MB avi) A submerged stick, one of the primary habitats for macroinvertebrates in small Coastal Plain streams, is cut and analyzed.
Macroinvertebrate sampling-- (2.4 MB quicktime)
Bug picking-- (685 KB avi) Large sieves are used to search sampled stream material for macroinvertebrates.
Bug picking-- (970 KB quicktime)
Sample splitting-- (1.1 MB avi) A sample of stream detritus containing macroinvertebrates is being split.
Sampling splitting-- (2.1 MB quicktime)
Corbicula sampling-- (1.8 mb avi) The Asiatic clam, Corbicula, was sampled to provide tissue for analysis of pesticides and trace elements. In this video clip clam rakes are being used in Swift Creek to collect the clams.
Borehole sampler -- (837 KB avi) A thin-diameter borehole sampler is being pounded into the ground to obtain a ground-water sample beneath a corn field.
Borehole sampler -- (1.4 MB quicktime)
Borehole sampler 2-- (882 KB avi) Close-up view of a thin-diameter borehole sampler being pounded into the ground to obtain a ground-water sample beneath a corn field.
Borehole sampler 2-- (1.5 MB quicktime)
To view quicktime files, you need the Apple® Quick Time player installed on your computer. A free copy of the Quick Time player may be downloaded from Apple.
To view avi files, you need the Microsoft® Windows Media Player installed on your computer. A free copy of the Windows Media Player may be downloaded from Microsoft.
Video of study activities: Cycle II (2001-2010)
Photographs of study activities: Cycle I (1991-2000), Cycle II (2001-2010)
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