survey quad-collette Johnson-usfws.jpg

a square made of PVD rests on the river bottom
Photo By/Credit
Collette Johnson/USFWS
Date Shot/Created
04/28/2023
Media Usage Rights/License
Public Domain
Image
A survey quad on the bottom of the Ohio River. The size of the quad or other technique employed varies depending on the type of survey work being done.
Facility
Ohio River Islands National Wildlife Refuge
Ecosystem
River/stream
Recreational Activity
Scuba diving
Staff
Collette Johnson
Subject tags
Surveying