GLG 112 1st Edition Lecture 36Outline of Last Lecture1. Natural vs. man madeII. Types of FloodsA. Flash Floods1. What is it?2. Where?3. Why and how?4. Examples Outline of Current Lecture B. Regional (downstream) floods1. What are they?2. Where are they?3. Why and how do they happen?4. ExamplesIII. Humans and floodingA. UrbanizationB. Human response Current LectureRegional floods are floods that occur slowly and last for a long duration. They usually last for weeks and sometimes months. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.They occur in the trunk stream closer to the mouth/base level. They occur on wide/flat floodplains. These floods occur from a long duration rainstorm and is widespread. They have the contribution of many tributaries. Examples:a. Upper Mississippi River 1993b. Thailand 2011Humans and FloodingUrbanization means more concrete and asphalt so there is an increase in runoff and a decrease in infiltration.Peak discharge is the highest point of a hydrograph or the highest water level.Lag time is the time between the start of rainfall and the peak.So what do we do to prevent flooding on floodplains?- Build levees- Raise homes- Build dams- Divert
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