this flood threatens to change the louisiana landscape. in addition to all this water. it carries silt, sand and sediment. it can change the landscape and the quality of the soil. farmers in the region are concerned about this. they met with state and federal agriculture officials. they say it's going to take time before they can assess the full impact of this flood. >> reporter: after the water recedes we'll have to see how much silt was deposited on the farmland. what's the quality of it? how much of the it will have to be moved. >> reporter: these levees were built to protect individual buildings. i'm stand on the permanent levee which is intact and it's keeping this side of the city, everything away from the river completely dry. but for the low-lying buildings