https://www.usgs.gov/media/images/water-quality-sample-collection-analysis-and-communication
Conceptual diagram showing how nontidal monitoring network (NTN) station water-quality samples are collected and analyzed, and how U.S. Geological Survey...
water qualitysample collectionanalysiscommunicationgeological
https://www.usgs.gov/media/images/water-sample-collection-filter-funnel
Water samples may be collected for environmental DNA analysis by directly submerging the filter funnel (connected to a length of silicone tubing) into the...
water sample collectionfilter funnelgeological