Images

USGS hydrologist Tim Cowdery titrates water alkalinity in a mobile sampling van using an electronic field form.

Beach-ridge prairie at Glacial Ridge National Wildlife Refuge

Morning fog over beach ridges at Glacial Ridge National Wildlife Refuge

Prairie Dog, Glacial Ridge National Wildlife Refuge

USGS technician Jody Hulne collects a groundwater nutrient sample at Glacial Ridge National Wildlife Refuge.

Speed Rail and Kee Lite are two common manufacturers of aluminum structural pipe fittings, a popular material in which to construct index-velocity meter mounts.

A SonTek Argonaut mounting plate is fastened to 2" conduit using a structural pipe wall flange.

A 4" aluminum I-beam is used allow an ADVM to be raised and lowered on a stainless steel sled.  The I-beam also serves as a pedestal mount for electronics housing.

2" aluminum pipe, structural pipe fittings, and square tubing are utilized to create a dock servicable uplooking ADVM mount.

Top view of beam orientation and sample volume of a sidelooking ADVM.  The ADVM-measured velocity used to index mean velocity is usually the sample volume x-component of velocity.

Profilers measure velocities in uniformly-sized cells or bins along the acoustic beams (fig 1). By measuring velocities in a number of bins across a channel or vertically through the water column, these instruments produce horizontal or vertical water velocity profiles, hence the designation "profiler.

USGS groundwater well (Ma-Wkw 2R) in Wayland, Massachusetts with holiday decorations.

Hydrologic technician performing an electric tape down measurement of a real-time recording groundwater well station while showing some holiday spirit. The site ID is: 415546071474701 RI-BUW 395 located in Burrillville, Rhode Island.

New hydrotech Sam Matschek takes WWG reading on Wabash River New Harmony, Indiana streamgage ID 03378500. 

Pamela Reilly, Hydrologist

Hydrologic Technician, Brady Long, performs routine water quality inspection of streamgage 0217206935 Cooper River in Charleston, SC. Cooperator/funding provided by the US Army Core of Engineers. 

Hydrologic Technician, Brady Long, performs routine water quality inspection at the Cooper River, South Carolina. 

USGS gage 330428079214800 Skrine Creek Near McClellenville, SC

Did you know the USGS has been studying groundwater since we were founded? USGS first measured the groundwater level at the well in this photo in 1918, over one hundred years ago! How often water levels are measured at a site in the USGS groundwater monitoring networks varies, depending on the scientific purpose of the measurement.

Did you know the USGS has been studying groundwater since we were founded? USGS first measured the groundwater level at the well in this photo in 1918, over one hundred years ago! How often water levels are measured at a site in the USGS groundwater monitoring networks varies, depending on the scientific purpose of the measurement.

Skylar Smith and Jim Duncker (Central Midwest Water Science Center) paddle across the Sandusky River, Ohio to collect bathymetry data for use in a hydraulic model.