http://www.redcross.org/faq/0,1096,0_682_4524,00.html
"The state Homeland Security Department had requested--and continues to
request--that the American Red Cross not come back into New Orleans
following the hurricane. Our presence would keep people from evacuating
and encourage others to come into the city."
This would seem to suggest that this was requested before the hurricane
and the flood hit.
"The original plan was to evacuate all the residents of New Orleans to
safe places outside the city. With the hurricane bearing down, the city
government decided to open a shelter of last resort in the Superdome
downtown. We *applaud* this decision and believe it saved a significant
number of lives."
"As the remaining people are evacuated from New Orleans, the most
appropriate role for the Red Cross is to provide a safe place for people
to stay and to see that their emergency needs are met. We are fully
staffed and equipped to handle these individuals once they are evacuated."
No where in the Red Cross FAQ does it say or even come close to suggesting
that trucks of food and water "was in the area of the Convention Center
and the Dome" at any time before or after the hurricane and flood.