Water Resources of the United States

PROJECT ALERT NOTICE (LA) Hurricane Isaac Project Alert Notification LAWSC

Date: Wed, 29 Aug 2012 07:46:04 EDT

Summary: Hurricane Isaac Hurricane Gage Impact Overview August 29, 2012

Hurricane Isaac made landfall over Southeastern Louisiana Tuesday night bringing sustained winds of 80 mph. Isaac is moving along the Louisiana coastline in a more west northwest path while keeping it's hurricane strength. The slow forward speed of 8 mph and a more northwest path over land is expected tonight. Rainfall is now expected to be between 7 - 14 inches over much of Louisiana.

Within the Breton Sound Basin, the LAWSC has two hardened gages which survived the storm surge.
300722089150100 Mississippi Sound near Grand Pass : 7 feet
07374527 Northeast Bay Gardene near Point-A-LA-Hache : 12 feet

The storm surge also impacted the Mississippi River Gages:
07374000 Mississippi River at Baton Rouge showed a surge of over 8 foot; 07374525 Mississippi River at Belle Chasse (07374525) showed a 10 surge in stage.

With in Lake Pontchartrain the gages recorded a Surge impact of less than 5 feet:
300413090084304 Lake Pontchartrain at Causeway : 4.5 feet
3004510895507 I-10 Drainge Canal near Little Woods : 3 feet
300830089515000 Little Irish Bayou at Hwy 11 near Slidell : 4.5 feet
302415090091465 Tchefuncte River at Hwy 22 at Madisonville : 3.5 feet

On the Hurricane's west side, the winds blow in a southerly direction. These southerly wind blew across the Barataria Basin resulting in a lowering of the stage before rebounding.
073802375 Lake Salvador near Lafitte shows a 2 foot drop.
2951190901217 L. Cataouatche at Whiskey Canal S of Waggaman show a 5 foot drop in stage. Now, many of the Barataria gages are rebounding in stage and showing the Hurricane's Surge affect.


http://waterdata.usgs.gov/la/nwis/current/?type=flow
http://la.water.usgs.gov/HardenedSites.html


Sub-Region: South Atlantic; Region: Eastern United States

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