. >> about 4 hours north in vicksburg mississippi, the army corp of engineers scientists are studying the exact impact coastal vegetation has on storm surge. jane mckee smith is a civil engineer. she's been studying the louisiana coastline since katrina. >> there's a lot of effort ongoing now to restore wetlands because that will help to dissipate not only the waves but it will also attenuate the surge but if we're going to include that into our designs we have to know how much. >> now as the waves are coming in explain to me what's happening? >> what we're seeing in this case is the waves coming in we see it traveling through...and it travels through the vegetation it's mobile ...so what we want to show is not only how the waves change as they go through but we want to have the dissipation as a function of distance, the height of the vegetation the width of the vegetation and also the density of the vegetation. >> since katrina the high security coastal and hydraulics lab has faced an added sense of urgency... says ty wamsley, the chief of flood storm protection. >> we really advance

vicksburg, mississippi, looking at a lot of rain and central use lies and atlanta looking at rain. tuscaloosa as well and alabama. this pocket where you see in the white richard this is where i think we'll see the worst of it going forward for today and tonight. we'll keep a close watch on the region. hopefully it won't be as bad as we what we saw in texas. with all the rain coming in it's something to monitor. >> thank you, bonnie schneider. >>> turning now to iowa, where all three remaining democratic candidates attended the jefferson jackson dinner in des moines, the traditional kickoff for the serious preparation for the first in the nation election. an important messaging event that unscientifically, hillary clinton brought in katy perry and her husband former president bill clinton joined her for the first time on the campaign time. >> you've got a lot of talk about breaking the glass ceiling. i want to talk about one barrier that has not been broken. i want you to support hillary for me, too, because i want to break a ceiling. i am tired of the stranglehold that women have h

it varied across the state, south mississippi wasn't quite as bad because there wasn't as much military action south of vicksburg as that there was in central and northern mississippi. >> i want to add one word to what tim was saying about preservation. everything he said was absolutely correct, the the need to study the battles and the movements, staff rides applying these lessons. i would venture to say that the majority of the people in this room have an ancestor in the civil war that was involved with the civil war in one way or the other. many of these battlefields, in particular those that have been developed and are covered up with stripmall's and walmarts, the need to preserve is a far greater to me then to adding another 5 acres to gettysburg or somewhere that has already been targeted. i'm working with the historic trails commission to put up signs for different activities that occurred there during the battle. it's so important because it's hallowed ground, people are still buried there, their graves were covered over with this development and if it was important enough for them to spill their blood a

vicksburg, another 5 1/2 inches of rain. that threat works from louisiana into mississippi today, tonight and even on monday. >> bonnie, thank you for the heads-up. >>> let's go to charles hadlock in houston for us today. so charles, you went from a soaked dallas yesterday to now the houston area. do you see evidence of floodwaters receding? >> yes, they are. take a look at this. bier at buffalo bayou park. this is buffalo bayou. the flood stage at 21 feet. it got up to 23 feet this morning but it's on its way back down. it filled this entire flood plain here. the ducks over here are enjoying this. downtown houston looks like it's under water. this is not. this is the trinity river. the buffalo bayou goes around the northern edge of downtown. when we get floodwaters, this area pools with water. we've been watching this volleyball net over here. that's seven feet. this morning it was under water. it's been dropping about a foot an hour. so by this afternoon, this will be drained of water. buffalo bayou will be back in its banks. the other bayous in town also got the bankful. we've got ten inches of rain over a 12 to 15-hour p