EESA07H3 Chapter Notes - Chapter 12 & 13: 100-Year Flood, Frequency Analysis, Water Scarcity
13 Dec 2016
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Eesa07h3 f: lecture 5 - dealing with floods and water scarcity. (october 17th, 2016) Water without sediment (below dams) are very aggressive. High intensity rainfall over a very short duration (thunderstorms). Flash flooding occurs due to rapid stormflow. Short-term flooding in small streams and urban areas. Low intensity rainfall over a long duration of time, falls steadily. A cause of flooding in large rivers. Melting snow coupled with rain increases volumes. When the flow of water in a river is larger than the channel used to convey it. Stormwater flow in urban areas is often highly modified by land use and by a network of storm sewers meant to convey rainwater to streams. During rainfall events, floods can enter people"s basements. Backups of storms or sanitary sewers are common. Storm surges of seawater due to high winds can lead to flooding with sea water. New orleans flooded by hurricane katrina in 2005.
