The sonde with sensors was deployed manually from a raft or other floating craft (e.g. Caddis Fly inflatable seat). The sonde was lowered at one meter intervals and, at each depth interval, the reading was allowed to stabilize before readings were transcribed from the handheld meter to a dive slate in the field. Following return to the laboratory, data on the dive slate were entered into a spreadsheet, a preliminary plot made, and any apparent erroneous data (e.g. density inversions) were double-checked for accuracy of transcription and corrected as necessary.