>> reporter: fred, here we're seeing bayous turning into gushing rivers. the rivers are moving here at a pretty good clip. now, this is a running path. if i were to continue walking down these steps there is a running path down here. you just can't see it at the moment. this is where two bayous converge and you can see that they are gushing towards the gulf of mexico actually, which is in that direction. that is the silver lining of this right now because during major storms we've seen these bayous run the opposite direction because, of course, storm surge brings in water from the ocean, pushes the water in these bayous backwards. now, authorities here are expecting 15 to 25 inches of rain, in some isolated areas up to 35 inches of rain. that could be catastrophic for some of these areas, because these bayous you see behind me, these meander through neighborhoods. people live by some of these pie