Published: Aug 24, 2012 5:12 PM EDT
Updated: Aug 24, 2012 7:39 PM EDT

CAPE CORAL, Fla. - The city with more than 400 miles of canals is bracing for Isaac. Workers in cape coral are cleaning grates and monitoring water levels. 

The city can raise or lower canal levels thanks to special barriers. The city has about 30 weirs spread throughout area canals.

They acts as barriers that you can raise or lower with air pressure, and right now we're told they are just about as low as they can go in preparation for Tropical Storm Isaac.  

"The levels have been low but they've come back with the recent rains we've had."

Jeffery Fielder lives near a large canal off Veteran's Memorial Parkway and says he's not too concerned about the incoming tropical storm.  

"We're pretty certain they'll be able to control the levels in the canals," he said. 

That's because city officials like Jeffrey Walter are keeping a close eye on the weirs, which control canal levels.  

"The weirs are lowered in order to allow more fresh water to spill over into the saltwater basis to avoid any catastrophic flooding," Walter said.

The city can raise or lower the weirs by one foot. That doesn't seem like much, but we're told, it can mean the difference of more than one billion gallons. 

City workers have also been busy cleaning and unclogging grates.  

"We did experience the wrath of Charley, so hopefully those experiences will pay off in terms of keeping the streets as clear as we can," said Walter.  

Mayor John Sullivan says the city, including agencies that monitor canals, is working off a storm plan that's been in place for years.   

"We don't do any running around at the last minute, trying to figure out what we're going to do in a storm situation, all that's been laying out including the communication so we can communicate with the residents," said Mayor Sullivan.  

Over the next couple of days, the city will continue to monitor every weir in the area, keeping a close eye on the levels.