Ground and hydrographic surveys of 42 square miles of swamp to create a detailed watershed model

In an effort to restore and maintain the cypress-tupelo swamp in the upper Barataria Basin, the LDNR planned to install a siphon for a freshwater diversion from the Mississippi River. In order for the agency to find the best location for the siphon, ABMB was selected to perform ground and hydrographic surveys of 42 square miles of swamp to create a detailed watershed model. ABMB determined the location of swamp elevations along a variety of project grids, the location and elevation of a highway bridge and associated culverts, as well as overbank surveys, channel cross sections, and average swamp elevations. A survey of this scale in such challenging conditions had never before been attempted.  Swamp and environmental conditions meant that standard surveying methods would not suffice, so ABMB utilized Real Time Differential GPS, and conventional leveling techniques backed by GPS Real Time Kinematic methods, to determine the elevations of 14 water staff gauges where there was a good GPS signal.
From this information, DNR was able to create a model to determine the best location for the Mississippi River siphon.

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