Water depth measurements at Hotcake Slough - Main study site No flash player has been set up. Please select a player to play Flash videos. Video not playing? Update your browser or download the video clip Chas Jones takes water depth readings at his study site to be used in calculating the rate of groundwater upwelling. Process Observed: Open WaterGroundwater UpwellingScientific MeasurementsWater Depth Date Process Observed: Saturday, March 31, 2012 Galleries: Hotcake Slough - Main Gallery