![DWR environmental scientist Morgan Martinez checks specialized netting and water collection containers while taking water samples from the Sacramento-San Joaquin Delta on DWR's research vessel the Sentinel.](/-/media/DWR-Images/Delta/Sentinel-Research.png?mw=200&hash=71ACC5879B496D7CFA0212D9E117A161)
This April marks the 50th anniversary of Earth Day, and to commemorate its theme of “climate action” the Department of Water Resources (DWR) is highlighting an important tool used for detecting the impacts of climate change in California’s Delta region; its research vessel, the Sentinel.