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Oklahoma Water Resources Board - Bathymetric Mapping Fact Sheet
3800 Classen Blvd, OKC, OK 73118 - (405) 530-8800 - www.owrb.ok.gov
Page 1
OWRB Bathymetric Mapping Program
The Oklahoma Water Resources Board’s modern-day bathy-metric
mapping program, which utilizes the agency’s GIS
and related technology, began in the late 1990s. Its purpose
is to provide accurate determinations of the current storage
capacities in the state’s reservoirs. Obtaining accurate stor-age
volumes is an integral tool used in the management of
the state’s water supply. For many reservoirs, the only avail-able
storage volumes are those that were estimated when the
lake was first constructed. Because of sediment deposition
that occurs in the reservoir, the volume of the reservoir can
be reduced over time. By conducting a lake bathymetric
survey, the managing authority of a reservoir can be better
equipped to handle critical water management issues.
Bathymetric Mapping
Shaded relief map of Ardmore’s Scott King Lake
craft as the survey vessel. The vessel travels across the
lake’s surface following the GPS path of pre-plotted transect
lines, the echo sounder gathers approximately eight read-ings
per second from the lake bottom. These depth read-ings
along with the positional data generated from the GPS
receiver are recorded to the on-board computer. Accurate
estimates of area-capacity can then be determined for the
lake by building a 3-D computerized model.
What Are the Results of the Survey
Used For?
The valuable information that a bathymetric survey pro-duces
can be used for many purposes.
* State and Federal Agencies - determine TMDLs, dam
breach analysis, watershed monitoring and management
*Municipalities - help determine amount of water a lake
can yield in the driest of times (reliable yield), aid in
assessing future needs
* Universities - research projects
* Fisheries Managers - help determine fish stocking
quotas, provide an estimate of lake volume for chemical
rehabilitation projects and vegetation control, and to
calculate potential yield of fish in lakes
* Anglers - find sunken points, drop-offs, mud flats, and
other features within the lake
* Hunters - find points and passes for waterfowl hunting
What is a Bathymetric Survey?
Bathymetry is the study of underwater depth of the third
dimension of lake floors. In other words, bathymetry is the
underwater equivalent to hypsometry (land surface eleva-tions).
The name comes from Greek words meaning deep
and measure. A bathymetric map or chart usually shows
floor relief or terrain as contour lines called depth contours
or isobaths.
The process of surveying a lake employs a Geographic
Positioning System (GPS) and acoustic depth sounding
instruments that are incorporated into a hydrographic survey
vessel. The OWRB uses an 18-ft aluminum hull Silverstreak
Oklahoma Water Resources Board
Object Description
Description
| Title | Fact-BathymetricMapping 1 |
| Full text | Oklahoma Water Resources Board - Bathymetric Mapping Fact Sheet 3800 Classen Blvd, OKC, OK 73118 - (405) 530-8800 - www.owrb.ok.gov Page 1 OWRB Bathymetric Mapping Program The Oklahoma Water Resources Board’s modern-day bathy-metric mapping program, which utilizes the agency’s GIS and related technology, began in the late 1990s. Its purpose is to provide accurate determinations of the current storage capacities in the state’s reservoirs. Obtaining accurate stor-age volumes is an integral tool used in the management of the state’s water supply. For many reservoirs, the only avail-able storage volumes are those that were estimated when the lake was first constructed. Because of sediment deposition that occurs in the reservoir, the volume of the reservoir can be reduced over time. By conducting a lake bathymetric survey, the managing authority of a reservoir can be better equipped to handle critical water management issues. Bathymetric Mapping Shaded relief map of Ardmore’s Scott King Lake craft as the survey vessel. The vessel travels across the lake’s surface following the GPS path of pre-plotted transect lines, the echo sounder gathers approximately eight read-ings per second from the lake bottom. These depth read-ings along with the positional data generated from the GPS receiver are recorded to the on-board computer. Accurate estimates of area-capacity can then be determined for the lake by building a 3-D computerized model. What Are the Results of the Survey Used For? The valuable information that a bathymetric survey pro-duces can be used for many purposes. * State and Federal Agencies - determine TMDLs, dam breach analysis, watershed monitoring and management *Municipalities - help determine amount of water a lake can yield in the driest of times (reliable yield), aid in assessing future needs * Universities - research projects * Fisheries Managers - help determine fish stocking quotas, provide an estimate of lake volume for chemical rehabilitation projects and vegetation control, and to calculate potential yield of fish in lakes * Anglers - find sunken points, drop-offs, mud flats, and other features within the lake * Hunters - find points and passes for waterfowl hunting What is a Bathymetric Survey? Bathymetry is the study of underwater depth of the third dimension of lake floors. In other words, bathymetry is the underwater equivalent to hypsometry (land surface eleva-tions). The name comes from Greek words meaning deep and measure. A bathymetric map or chart usually shows floor relief or terrain as contour lines called depth contours or isobaths. The process of surveying a lake employs a Geographic Positioning System (GPS) and acoustic depth sounding instruments that are incorporated into a hydrographic survey vessel. The OWRB uses an 18-ft aluminum hull Silverstreak Oklahoma Water Resources Board |
| Date created | 2013-08-28 |
| Date modified | 2013-08-28 |
