Lake Fort Scott
Bathymetric Survey
Spring 2006
Natural Resources and Environmental Sciences
Kansas State University
Kevin Bergman
Kyle Fitzgerald
Jud Gladin
Jennifer Hancock
Tyler Pjesky
Natural Resources and Environmental Sciences
Outline
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Introduction
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Process and Approach
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Contacts and Resources
Training
Conducting Survey
Analysis
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Purpose
Background Information
Bathymetric Survey
Assumptions
Volume Calculations
Conclusions
Natural Resources and Environmental Sciences
Purpose
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Develop Map of Lake Bottom
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Estimate Lake’s Storage Capacity
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Determine Sedimentation Rate
Lake Fort Scott. www.giskansas.org
Natural Resources and Environmental Sciences
Background Information
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Lake Fort Scott constructed in 1958 to augment water supply
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Original capacity of 2.1 billion gallons or 6485 acre-feet.
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Water occasionally used from lake during dry years to maintain sufficient
quality drinking water for city.
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Land use within watershed is primarily production agriculture (grassland)
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Shoreline property has been sub-divided into 141 lots for part-time and
permanent year round residential housing
Natural Resources and Environmental Sciences
Bathymetric Survey
Bathymetric Survey: A survey of the
bottom surface of a water body to
produce a topographic map.
• Uses
– Estimating water volumes
– Mapping bottom surfaces of water
bodies for exploration
Natural Resources and Environmental Sciences
Single Beam Echo Sounder
A single-beam echo sounder produces
soundings by transmitting short pulses of
acoustic energy down towards the lakebed and
detecting those pulses reflected. The depth
under the vessel is then calculated from the
2-way travel time of pulses and the mean
speed of sound over the water column
Image taken from pao.cnmoc.navy.mil/…/
indexunderwater.htm
Natural Resources and Environmental Sciences
Making Contacts and Acquiring Resources
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Kansas USGS
Lawrence, KS
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Hypack Inc.
Middletown, CT
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Develops software for marine surveys
Agreed to loan software for one month
at no charge, $6,500 value
Odum Hydrographic Systems Inc.
Baton Rouge, LA
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Agreed to loan equipment at no charge
One day of training at no charge,
$10,000 - $15,000 value
Natural Resources and Environmental Sciences
Training
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Training in Baton Rouge, Louisiana
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Odom Hydrographic Systems Incorporated
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Detailed explanation of the survey process
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Hands-on-training on Mississippi River
Hydrotrac HT100 single beam echo sounder
Natural Resources and Environmental Sciences
Hypack bathymetric survey software
Conducting Survey
• Equipment Requirements:
– Boat
• 2000 Lund 1800 Fisherman
– Power Source
• Generac 5550 Watt/8550 surge generator
– Survey Equipment
• Hydrotrac HT100 single beam echo sounder
• GPS receiver
– Analytical Software
• Hypack
– Laptop
• Dell Inspiron 300m
– Calibration Device
• 8 pound anchor
Natural Resources and Environmental Sciences
Conducting Survey
• Preparation
– Attach the transducer
– Mount GPS receiver
Natural Resources and Environmental Sciences
Conducting Survey
• Calibration
– Building a calibrating device
Natural Resources and Environmental Sciences
Conducting Survey
Dam
NORTH
Natural Resources and Environmental Sciences
Conducting Survey
Dam Location
Cross Section Lines
Boundary Line
Natural Resources and Environmental Sciences
Analysis
• Assumptions
• Volume Calculations
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Hypack
Notepad
Microsoft Excel
AutoCAD Land Desktop
• Map and Volume
Natural Resources and Environmental Sciences
Assumptions
• Minimum depth 2’
• Lake perimeter adjusted
– Lake aerial image
– Lake floor
Natural Resources and Environmental Sciences
Volume Calculations
• Hypack
• Notepad
• Microsoft Excel
1
2
3
4
2392920.09
2393474.48 1742689.33
1736804.91844.9
840.30
2392940.53
2393543.38 1742683.83
1736881.02843.2
843.00
2392960.56
2393618.11 1742682.78
1736951.12842.1
841.60
2392981.52 1742685.28 841
2393700.28 1737010.30 839.70
2393787.47 1737060.83 837.40
• AutoCAD Land Desktop
Natural Resources and Environmental Sciences
Results
1957
6,485 acre feet
2006
5,980 acre feet
505 acre feet of sedimentation
• 7.8% capacity loss
• 10.31 acre feet per year
• 0.16% capacity loss per year
Natural Resources and Environmental Sciences
Conclusions
• The sedimentation rate of the lake may not be the major
concern with quality water supply to the city.
• Adjacent land use may require better regulation.
• Rate is based on two points of data over 50 years apart
which does not give an accurate indication of lake
conditions.
Natural Resources and Environmental Sciences
Alternative Surveying Techniques
Hardware Alternatives
• Multi-beam Echo-sounder
Software Alternatives
• Hypack (for analysis and
modeling)
• Fishfinder/Depth finder
• Trimble HYDROproTM
• Manual depth recordings
Natural Resources and Environmental Sciences
Service Learning Goals
• Contribution to Community
• Professional Development
Natural Resources and Environmental Sciences
Cost Comparison
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Project budget: $2000
Project expenses: $1500
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Software donated by Hypack Inc (actual cost = $6500)
Equipment donated by OHSI (actual rental cost = $95/day + shipping, etc)
Training donated by OHSI (actual cost = $800/day)
Personnel hours donated (actual consulting cost = $150/hr)
Cost to hire a professional consultant to perform a similar survey:
approximately $20,000
Cost to City of Fort Scott
– 2 nights at Best Western
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Learning Experience = Priceless
Natural Resources and Environmental Sciences
Acknowledgments
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City of Fort Scott
Kansas Department of Health and Environment
WaterLINK
Odom Hydrographic Systems Inc.
Hypack Inc.
Questions?
Natural Resources and Environmental Sciences