This looks like is from tha artical you got the 17% number from:

"If the Army Corps capabilities for the SELA program had been fully funded, there is no question that Jefferson Parish and New Orleans would be in a much better position to remove the water [after the flooding] on the streets once the pumps start working," says Hunter Johnston, a lobbyist for Johnston and Associates who worked to secure the money.

It is too early to tell, however, whether the additional funding would have prevented the levee breaches and overruns that have flooded New Orleans. Scientists, journalists and public officials have been warning for decades that New Orleans could not withstand a Category 4 or 5 hurricane. Even SELA, which was started in the mid-1990s after flooding caused billions in damage, was designed to protect against smaller storms, though planners said it would reduce damages of "larger events."

"If you had engineered everything in America for a Category 5 hurricane, you could not have built anything," said Jimmy Hayes, a former Republican congressman from Louisiana, who now lobbies for federal funding. "There is never enough money."

According to Michael Zumstein, a Corps official working to drain New Orleans, both of the major levee breaches in New Orleans were caused by more water than the Corps' current plans, even if funded, could handle. "It's just the law of physics, that's all," he said, noting that the system was designed to withhold a slow-moving Category 2 or a fast-moving Category 3 hurricane. Katrina was a Category 4 storm when it hit land Monday morning. He said an unexpected break at the 17th Street Canal occurred 700 feet south of a bridge where the Corps recently completed a troubled construction project.

Flooding also occurred on the east side of New Orleans, in the St. Bernard Parish, an area that environmentalists have long warned would be susceptible to flooding because of a poorly designed canal built in the 1960s that joins the Mississippi River to the Gulf of Mexico. Since 1998, local politicians have been demanding that the so-called Mississippi River Gulf Outlet be closed, in part because it was allowing saltwater to destroy marshland, increasing the danger of a storm surge. Both the Clinton and the Bush administrations have been slow to respond to those demands, and earlier this week, the storm surge topped levees, flooding the parish, said Zumstein.