Did George W. Bush allow Katrina to happen to hide his own negligence?

As unbelieveable as it sounds that’s the claim of this article;

“By midnight on Monday, the White House knew. Monday night I was at the state Emergency Operations Center and nobody was aware that the levees had breeched. Nobody.”

The charge is devastating: That, on August 29, 2005,

the White House withheld from the state police the information that New Orleans was about to flood. From almost any other source, I would not have believed it. But this was not just any source. The whistle-blower is Dr. Ivor van Heerden, deputy director of the Louisiana State University Hurricane Center, the chief technician advising the state on saving lives during Katrina.”