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Title: Environmental Assessment : Continued Operations and Maintenance Dredging Placement of Dredged Material on Dade County Beach Erosion Control Project, Intracoastal Waterway, Cut DA-9 at Bakers Haulover Inlet, Miami-Dade County, Florida
Authors: United States. Army. Corps of Engineers. Jacksonville District.
Keywords: Dredging
Dredging spoil
Beach erosion
Beach nourishment
Miami-Dade County (Fla.)
Publisher: United States. Army. Corps of Engineers. Jacksonville District.
Abstract: The U.S. Army Corps of Engineers (USACE), Jacksonville District proposes the continued periodic dredging of the Atlantic Intracoastal Waterway (AIWW), Cut DA-9 (in the vicinity of the Bakers Haulover Inlet) and settling basin, any time of the year and on an “as-needed” basis in order to maintain safe navigation in the channel (Figure 1). The work would consist of routine operations and maintenance (O&M) dredging of an estimated 50,000 cubic yards of sand from portions of the AIWW and settling basin as needed (Figure 2 and Figure 3). The channel is up to 150 feet wide and 12 feet deep, with 3:1 side slopes on each side of the channel. The approximate length of DA-9 is 7,200 feet. The settling basin is 3,900 feet long by 75 feet wide and 13 feet in depth. Under state permitting, the authorized dredging area is currently 3,700 feet long by 125 feet wide with a settling basin 1,200 feet long by 25 feet wide. This means that the entire cut, as currently permitted, cannot be maintained to its congressionally authorized limits under current state permitting requirements. Shoal material will be placed either in the 5,000 foot long beach placement area to the north of the inlet (Haulover beach placement area) or on the 4,000 foot long beach placement area south of the inlet (Bal Harbour beach placement area) (Figure 2). The project is expected to be dredged every other year or as needed due to weather related shoaling. This portion of the AIWW is the second fastest shoaling area in the entire length of the waterway and it has been dredged at least six times since 1991. Cut DA-9 was dredged in Fiscal Year (FY) (1 October through 30 September) 1991, FY94, FY98, FY05, FY10, and FY13 for at least 466,463 cubic yards (CY) of dredged material, with proposed dredging again in FY17. All of the dredged material since FY05 has been placed on the Bal Harbor beach placement area south of the inlet.
Description: Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Size: 75 pages/5.513 Mb
Appears in Collections:Environmental Documents

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