Measuring lake health: How to make and use a Secchi disk
3:25
Build Your Own Secchi Disk!
9:30
JBA Trust hydraulic flume showing how engineered structures affect flow in rivers (full video)
1:10:05
RAC Imaging Workshop — Beginner Astrophotography Series, Part Two: Telescope + Equatorial Mount
3:34
NALMS Student Video Series #1: How to Take a Secchi Depth
5:06
How to Measure Water Turbidity
1:02:15
Modeling and Monitoring of Agroecosystem Outcomes
7:15
AfD-Kanzlerkandidatin Weidel im tagesthemen-Interview
2:51