US Army Corps of Engineers Lake Mapping Project Assists Client in Locating Sedimentation Problems

The US Army Corps of Engineers teamed up with Integrated Lakes Management for a Bathymetric Lake Mapping project in Chicago.  Ships and barges using this particular harbor have been battling sedimentation while navigating through the water  and required a bathymetric survey to understand the severity of the problem.   GPS lake mapping techniques developed by The Mapping Network were used to create an accurate depth model of the harbor.

Bathymetric Contour Map

Bathymetric Contour Map

A color shaded depth map with bathymetric contour lines

A color shaded depth map with bathymetric contour lines

More information on Integrated Lakes Management visit their website:  www.lakesmanagement.com

The Mapping Network:  www.TheMappingNetwork.com

A Nationwide Network of GPS Mapping Professionals

Pond Medics, Inc Uses Lake Mapping Technology To Save HOA 50% From Original Dredging Bids

For lake associations or landowners undertaking a significant lake or pond renovation project, having an accurate map is essential for effective sediment removal.  Dredging companies and their clients benefit from knowing where and how much sediment needs to be removed to achieve the desired results.  This knowledge is made clear by having the lake professionally mapped.  Trent Lewis with Pond Medics, Inc. (Prosper, TX) put this technology to use for a client, in this case a lake association in Dallas, Texas.  The board of directors had a cove on the lake which had filled in with so much sediment that homeowners were unable to launch their boats.  The association wanted to achieve a minimum depth of three feet to allow boats to travel through without worry.  Originally bids were acquired by three contractors but the association became confused when the bids ranged from $170,000 to $210,000 for sediment removal.  Mr. Lewis suggested a solution where the lake would be mapped and sediment measurements taken to create a comprehensive base map for the dredging companies to hone their bids.  The result allowed the board of directors the ability to fine-tune the bids and the entire project was completed for $92,000.  The lake was then re-mapped upon completion of the dredging to verify sediment had been removed.  Mr. Lewis said the board was extremely thankful for having the ability to accurately map their lake and as a result the association was able to save nearly 50% off the original cost for the dredging project.

Benefits to Association

  • Locate and identify areas to be dredged
  • Save time and money by providing contractors with accurate plan
  • Peace of mind knowing all work is completed to plan
  • Ability to monitor sediment over time with routine mapping

Benefits to Dredging Company

  • Understand the scope of work
  • Accurately bid projects with better information
  • Provide the client with a map to prove work is completed
More information on Pond Medics, Inc. can be found at their website: www.pondmedics.com

Bathymetry before Dredging

Bathymetry before Dredging
Bathymetry After Dredging
Bathymetry After Dredging

Dredging Map for Cove

Dredging Map for Cove

Quality Lakes, Inc. Uses Lake Mapping Technology (Bathymetry) To Accurately Identify And Calculate Dredging Areas

Wade Bales with Quality Lakes, Inc. out of Bluffton, South Carolina, has been promoting lake mapping as a standard base map for his clients.  Quality Lakes believes that an accurate, up-to-date map of a lake assists in several management areas.  This philosophy helped a client who was trying to comprehend the severity of sedimentation of their prized fishing lake.  Mr. Bales explained that “this impoundment is a popular fishing destination for members of the club.  Many species of marine sportfish, such as redfish and flounder, utilize the impoundment throughout the year.  Two water-control structures provide tidal influence on water volume.  Some years back the dikes were rebuilt using spoil from the impoundment.  It was apparent that siltation has occurred since that time. ”  Managers were contemplating applying for necessary permits to dredge in order to increase the overall average depth for fisheries habitat.  Due to the expense of such a project however, they decided to have the impoundment mapped to provide a baseline depth profile which they could revisit in the future to determine if dredging was truly necessary.  This effort would also identify the deepest areas of the impoundment that may be conducive to aeration.  The resulting map provided the baseline depth profile needed for long-term sedimentation monitoring.  Property Manager, Paul Pyle, agreed, “I think the maps are great. I couldn’t have gotten a better picture of what I normally can’t see.”

More information on Quality Lakes, Inc. can be found at their website: www.qualitylakes.com

Sediment Map
This image displays the area that needed to be dredged and the amount of sediment to be removed

Efficient Sediment Monitoring

Integrated Lakes Management (ILM) recently completed a mapping project for a Chicago metro homeowners association.  The purpose of this project involved sediment monitoring for future dredging.  Katie Traer, an Environmental Scientist with ILM, said “in order to avoid large costs and help property managers budget for sediment removal, we locate the high priority areas of sediment accumulation and determine the need and location for dredging.”  The mapping techniques utilized in this project helps ILM accurately calculate in-situ sediment volume and accumulation over time.  Thus, ILM is able to accurately isolate areas of high sedimentation for removal and help property managers budget accordingly.  This powerful information allows for smart management decisions and will save thousands of dollars in the future.

More information on ILM can be found at their website: www.lakesmanagement.com

Map showing sediment depth. Individual depth points and color-shaded depth is shown. A great tool for understanding areas needing sediment removal.

Map showing sediment depth. Individual depth points and color-shaded depth is shown. A great tool for understanding areas needing sediment removal.


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