Bonnet Carré Spillway Operation 3819

Members,

The Corps’ Mississippi Valley New Orleans (MVN) intends to open 20 bays on the Bonnet Carré  Spillway today (Friday, March 8, 2019).  The MVN manages the opening of bays in order to keep the maximum flow at New Orleans at/or below the trigger point flow of 1.25 million cubic feet per second (cfs).

The MVN will continue to oversee the operation of the Spillway as a flood control structure in accordance with the approved Bonnet Carré  Spillway Water Control Manual. The MVN plans to gradually open a total of 200 bays (approximately) based on efforts to maintain the maximum flow at New Orleans.   The MVN advises the crest above the Spillway is presently forecasted to arrive on March 13, 2019.  The latest maximum flow projection is 1.445 million cfs, this projection is based on the measured flow at Red River Landing, with timing adjusted for downriver.  Backing out 1.25 million cfs at New Orleans predicts a maximum flow through the Spillway at 205,000 cfs during crest with estimated 200 bays opened.

  BONNET CARRéSPILLWAY OPERATION

DATE

CARROLTON GAUGE (NEW ORLEANS)

BAYS OPENED

TOTAL NUMBER OF BAYS OPENED

SPILLWAY DISCHARGE CUBIC FEET PER SECOND (cfs)

2/27/19

16.02 feet

28

28

23,000 cfs

2/28/19

16.20 feet

20

48

37,000 cfs

3/1/19

15.99 feet

40

88

75,000 cfs

3/2/19

16.00 feet

20

108

93,000 cfs

3/3/19

16.30 feet

0

108

95,000 cfs

3/4/19

16.50 feet

40

148

133,000 cfs

3/5/19

16.5 feet

0

148

144,000 cfs

3/6/19

16.6 feet

0

148

148,000 cfs

3/7/19

16.6 feet

20

168

169,000 cfs

3/8/19

16.6. feet

20

188

187,000 cfs

The Carrolton Gauge is now expected to reach 17.0 feet on March 13, 2019 and to remain at that stage until March 16, 2019.  The operation of the Bonnet Carré Spillway will artificially control the crest at 17 feet (approximately) and maintain the maximum flow at New Orleans at or below 1.25 million cfs.

Best Regards,

Sean

Sean M. Duffy, Sr.

Executive Director

Big River Coalition