GPR Bathymetry Used to determine water depth and sediment stratigraphy on Methuen Lake, Canada - September 2005 A Noggin 250 with GPS positioning unit mounted in a small rubber boat and towed by a canoe SEE THE FULL STORY ON THE NEXT PAGE.Overview Hydrologists and engineers often require accurate water depth and information about sub-bottom stratigraphy in shallow freshwater lakes and rivers. Uses can vary from estimating available water

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