Analysis Report (2026 May 30

Survey Metadata
Data Collector:	Eli Kersh
Survey Time Stamp (UTC):	2026 May 29 - 21:18
Starting Location:	38.083104, -122.513154
Ending Location:	38.083354, -122.514116
Distance	9.186 miles

Survey Statistics
Average Water Temperature:	73.6 °F
Survey Area:	111.430 acres
Survey Volume:	773.714 acre ft
Percent of Waterbody Surveyed:	97.1%
Waterbody Area:	114.721 acres
Estimated Waterbody Volume?	796.562 acre ft

Survey Settings
Includes Edited Data:	No
Track Buffer:	25 m
BV Grid Cell Size:	5 m
BV Minimum Detection - Percent:	5.0%
BV Minimum Detection - Depth:	2.400 ft
BV Maximum Detection - Depth:	20.000 ft
BV Sonar Channel:	Primary

Quality Control
Reviewer:	Ian McCormack
Comments:	We have reviewed this trip. Please use the "ASK THE EXPERTS" button for this trip if you have any questions.

Biovolume Summary

Type?	PAC?	Avg BVp?	SD BVp?	Avg BVw?	SD BVw?	Depth Range	Depth Avg	No. Depth Records
Point	55.8%	17.8%	± 19.1%	9.9%	± 17.4%	3.43 - 14.64 ft	7.762 ft	3165
Grid	65.0%	17.6%	± 14.6%	11.4%	± 14.4%	0.34 - 14.12 ft	6.943 ft	28967

Bathymetric Contour Map	Vegetation Biovolume Heat Map

Hypsographic Summary

Hypsographic Chart

Depth	Area?	AreaP?	Volume?	VolumeC?	VolumeP?
0 - 1 ft	111.430 acres	100%	110.918 acre ft	773.714 acre ft	100%
1 - 2 ft	109.617 acres	98.4%	107.917 acre ft	662.796 acre ft	85.7%
2 - 3 ft	106.313 acres	95.4%	104.824 acre ft	554.879 acre ft	71.7%
3 - 4 ft	103.356 acres	92.8%	101.906 acre ft	450.055 acre ft	58.2%
4 - 5 ft	100.448 acres	90.1%	98.924 acre ft	348.150 acre ft	45.0%
5 - 6 ft	97.288 acres	87.3%	94.485 acre ft	249.226 acre ft	32.2%
6 - 7 ft	89.109 acres	80.0%	71.281 acre ft	154.740 acre ft	20.0%
7 - 8 ft	50.427 acres	45.3%	38.291 acre ft	83.459 acre ft	10.8%
8 - 9 ft	27.899 acres	25.0%	19.863 acre ft	45.169 acre ft	5.8%
9 - 10 ft	15.982 acres	14.3%	12.958 acre ft	25.306 acre ft	3.3%
10 - 11 ft	9.806 acres	8.8%	7.130 acre ft	12.348 acre ft	1.6%
11 - 12 ft	5.077 acres	4.6%	3.806 acre ft	5.218 acre ft	0.7%
12 - 13 ft	2.634 acres	2.4%	1.368 acre ft	1.412 acre ft	0.2%
13 - 14 ft	0.233 acres	0.2%	0.044 acre ft	0.044 acre ft	0.0%
14 ft +	0.002 acres	0.0%	0.000 acre ft	0.000 acre ft	0.0%

Biovolume Analysis by Quintiles

Type?	0 - 20%	20 - 40%	40 - 60%	60 - 80%	80 - 100%
Point	87.3%	8.5%	1.7%	0.1%	2.5%
Grid	83.0%	11.7%	3.4%	1.5%	0.4%

Biovolume Analysis by Depth

Type?	Depth	Count	PAC?	Avg BVp?	SD BVp?	Avg BVw?	SD BVw?
Point	0 - 1 ft	0	0%	0%	± 0%	0%	± 0%
	1 - 2 ft	417	56.4%	28.5%	± 30.4%	16.1%	± 27.7%
	2 - 3 ft	1231	61.6%	14.5%	± 13.7%	8.9%	± 12.5%
	3 - 4 ft	97	24.9%	13.2%	± 12.7%	3.3%	± 7.9%
	4 - 5 ft	0	0%	0%	± 0%	0%	± 0%
	5 - 6 ft	0	0%	0%	± 0%	0%	± 0%
	6 - 7 ft	0	0%	0%	± 0%	0%	± 0%
	7 - 8 ft	0	0%	0%	± 0%	0%	± 0%
	8 - 9 ft	0	0%	0%	± 0%	0%	± 0%
	9 ft +	0	0%	0%	± 0%	0%	± 0%
Grid	0 - 1 ft	2310	86.4%	20.3%	± 16.0%	17.6%	± 16.4%
	1 - 2 ft	8717	75.0%	22.6%	± 18.7%	17.0%	± 18.9%
	2 - 3 ft	15128	63.5%	14.0%	± 9.3%	8.9%	± 10.0%
	3 - 4 ft	2786	25.2%	11.6%	± 6.7%	2.9%	± 6.1%
	4 - 5 ft	25	0%	0%	± 0%	0%	± 0%
	5 - 6 ft	0	0%	0%	± 0%	0%	± 0%
	6 - 7 ft	0	0%	0%	± 0%	0%	± 0%
	7 - 8 ft	0	0%	0%	± 0%	0%	± 0%
	8 - 9 ft	0	0%	0%	± 0%	0%	± 0%
	9 ft +	0	0%	0%	± 0%	0%	± 0%

Offsets

Trip Name	Trip Date (UTC)	Manual Offset (ft)	Tide Station Name?	Avg Tide (ft)	Min Tide (ft)	Max Tide (ft)	Start Tide (ft)	End Tide (ft)
Sonar_2026-05-29_1 ...	2026 May 29 - 21:18	0.000	NA	NA	NA	NA	NA	NA

Glossary

AOI: Area of Interest: Defines the transects or contiguous data samples as depicted by the colored trip line. Seperate areas of interest can be generated through merging of multiple trips, appending data to a single sonar log or lapses in time (greater than five minutes) within a sonar log.
Point: Individual Coordinate Point: A single point represents a summary of sonar pings and the derived bottom and canopy depths. Individual point data create an irregularily spaced dataset that may have overlaps and/or gaps in the data resulting in a increased potential for error.
Grid: Geostatistical Interpolated Grid: Interpolated and evenly spaced values representing kriged (smoothed) output of aggregated data points. The gridded data is most accurate summary of survey areas.
BVp: Biovolume (Plant): Refers to the percentage of the water column taken up by vegetation when vegetation exists. Areas that do not have any vegetation are not taken into consideration for this calculation.
BVw: Biovolume (All water): Refers to the average percentage of the water column taken up by vegetation regardless of whether vegetation exists. In areas where no vegetation exists, a zero value is entered into the calculation, thus reducing the overall biovolume of the entire area covered by the survey.
PAC: Percent Area Covered: Refers to the overall surface area that has vegetation growing.
Area: Area: Surface area of corresponding depth range and deeper.
AreaP: Area Percent: Percent of total surface area of the corresponding depth range and deeper.
Volume: Volume: Water volume of the corresponding depth range.
VolumeC: Volume Cumulative: Cumulative water volume of the corresponding depth range and deeper.
VolumeP: Volume Percent: Percent of total water volume of the corresponding depth range and deeper.
Type: Individual Coordinate Point: A single point represents a summary of sonar pings and the derived bottom and canopy depths. Individual point data create an irregularily spaced dataset that may have overlaps and/or gaps in the data resulting in a increased potential for error.

Geostatistical Interpolated Grid: Interpolated and evenly spaced values representing kriged (smoothed) output of aggregated data points. The gridded data is most accurate summary of individual survey areas.
Estimated Waterbody Volume: Estimated Waterbody Volume: The total lake volume estimation is based on this dataset only and will depend on total coverage and coverage depths of collected data.
Tide Station Name: Following deprecation and support of WTides, we upgraded our tide solution to Marea Tides that uses the global tide model Finite Element Solution (1 /16º grid; FES2014) to offset depths every minute to MLLW Datum.

Bel Marin Lagoon, Marin County California

Biovolume Summary

Hypsographic Summary

Biovolume Analysis by Quintiles

Biovolume Analysis by Depth

Offsets

Glossary