
858 
WGUS74 KLIX 012137
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
437 PM CDT SAT SEP 1 2012

LAC103-020200-
/O.CON.KLIX.FF.W.0080.000000T0000Z-120902T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ST. TAMMANY LA-
437 PM CDT SAT SEP 1 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR
CENTRAL ST. TAMMANY PARISH...

...A FLASH FLOOD EMERGENCY FOR RESIDENTS BELOW LOCK AND DAM #2 
DOWNSTREAM TO HICKORY...

THE FOLLOWING ARE SOME MORE DETAILS REGARDING THE FLASH FLOOD 
EMERGENCY DECLARED FOR THE PEARL RIVER DIVERSION CANAL. 

IF AND WHEN THE STRUCTURE FAILS...THE ESTIMATED INITIAL FLOOD WAVE 
IS EXPECTED TO BE AROUND 11 FEET. 

THE CAMPGROUND ONE-HALF MILE DOWNSTREAM OF THE LOCK STRUCTURE IS 
ESTIMATED TO GET ABOUT 10 FEET OF FLOOD WAVE. THIS CAMPGROUND AND 
NEARBY RESIDENTS HAVE BEEN EVACUATED. 

TRAVEL TIME OF THE FLOOD WAVE TO LOCK AND DAM NUMBER ONE...11 MILES 
DOWNSTREAM...IS ESTIMATED TO BE ONE HOUR WITH A FLOOD WAVE ESTIMATED 
TO BE 5.5 FEET. THIS STRUCTURE WILL OFFER SOME RESISTANCE TO FURTHER 
TRAVEL DOWNSTREAM. 

IF THE WAVE SHOULD CONTINUE BEYOND LOCK AND DAM NUMBER ONE...
AT INTERSTATE 59 AT THE PEARL RIVER...18 MILES DOWNSTREAM...A FLOOD 
WAVE OF AN ADDITIONAL 2.5 FEET OF WATER LEVEL WOULD REACH THAT POINT 
BETWEEN 2 AND 4 HOURS OF PASSING LOCK AND DAM NUMBER ONE. 

THESE HEIGHTS AND TIMES ARE ESTIMATES AS COORDINATED WITH THE LOWER 
MISSISSIPPI RIVER FORECAST CENTER. AT THIS TIME...THE STRUCTURE IS 
STILL INTACT AND RELIEF VALVES HAVE BEEN OPENED TO LESSEN SOME 
PRESSURE ON THE STRUCTURE. 

PERSONS AND INTERESTS IN THIS WARNED AREA SHOULD NOT RETURN UNTIL 
THE LOCAL OFFICIALS GIVE THE ALL CLEAR. THIS REMAINS A DANGEROUS 
SITUATION WITHIN A LIMITED AREA NEAR AND DOWNSTREAM OF THE PEARL 
RIVER DIVERSION CANAL BELOW LOCK AND DAM NUMBER TWO.  

LAT...LON 3064 8982 3062 8983 3059 8981 3058 8982
      3051 8976 3042 8974 3042 8978 3053 8982
      3063 8988 3065 8983

$$


24/RR