Timeline of work for Amphibex at the Paul J Rainey Sanctuary

For the last 5 years, Audubon has owned and been operating a mini-dredge, the “John James” on its sanctuary property to build marsh.  Through a NFWF grant, we have recently been presented with a unique opportunity to demonstrate the use of another small dredge, the Amphibex 400 owned by Crosby Dredging Co., to create marsh in the same permitted area. The Amphibex is only 13 feet longer than our mini-dredge but can move 10 times more material in the same amount of time as the Audubon mini-dredge. A new Audubon-owned, GPS-linked fathometer system will allow us to monitor and document the refill rate of the borrow area.

  • October 7:       The Amphibex 400 arrived at the Paul J Rainey Wildlife Sanctuary.
  • October 9:       Began pumping into the permitted pond from the entrance to North Canal
  • October 12:     Added 300 feet of pipe in the pond
  • October 16:     Amphibex was dredging level with the Study Site landing fluid mud to the water surface for approximately two-thirds of the 15-acre pond;
  • October 18:  Amphibex dredging hours totaled 200 and had created 9 acres of fluid mudflat; in 220 hours the mini-dredge created 1 acre of mudflat.
  • October 23-25: Coastal Flood Warning; High water from a combination of full moon, tropical depression in the western GOM, and strong easterly winds pushed waterlevel a good +4 feet above normal.
  • November 3: Water level finally dropped so that we could see mudflat filling 14 acres of the pond.
  • November 4: measured settling pans by airboat
  • November 5: Amphibex pulled all dredge pipe out of the pond and canal
  • November 7: Amphibex and Quarter boat left the Sanctuary.

This is an estimated status of the NFWF Marsh Restoration Project on November 4, 2015.

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