Name Learning Unit 7 Flood Review Questions This assignment is designed to assess your understanding of Unit 6 and includes some of the Questions for Review at the end of Chapters 10 15 and 14 from your text plus a few additional questions Each question can be answered in one to two sentences Please limit yourself to a maximum of three sentences Access the assignment complete it with ANSWERS IN A DIFFERENT COLOR FONT as a separate file and send it back for evaluation and grading through the assignment tab by or before the due date 1 Of all of the common natural hazards which causes more than 80 percent of all deaths 2 What aspects of weather cause a flood Be specific not merely more water 3 How is a drainage basin defined 4 Why does stream level rise within a few hours of a heavy rain even though you see no water running off the slopes 5 How would you calculate the discharge of a stream 6 What is the definition of a flood Be specific not merely more water 7 How do the characteristics of upstream and downstream floods differ 8 Why are upstream floods referred to as flash floods What effect can flooding an increase in discharge have on stream flow in an upstream channel 9 What changes imposed on a stream would likely lead to higher level floods with the same rainfall pattern 10 With urbanization of the drainage area what changes can be expected in the height or extent of the 100 year floodplain 11 What information is represented by a hydrograph 12 How would a hydrograph for a stream change if major urban growth were to occur 13 People should not build homes on floodplains because of the danger of flooding What are better uses for floodplains 14 If floodplains are such poor places to live why are so many towns located on floodplains 15 What do we mean when we refer to a flood as the 10 year flood 16 What is the simple formula for calculating the recurrence interval T for a certain size flood on a stream in 1999 if there are sixty nine years of record Give a numerical example based on the largest flood 17 If the 70 year floodplain was flooded in 1999 and there is a slightly larger flood 4 years later in 2003 what if any change is there in the recurrence interval for the 1999 flood Be numerically specific 18 If a 100 year floodplain was flooded in 2003 in how many years should we expect the next 100 year flood 19 Why is the specified 100 year floodplain size or 100 year flood height not a very reliable indicator for future large floods 20 What are the limitations for building on a designated floodplain 21 What are natural levees and where do they form 22 Aside from protecting the adjacent stream bank what effects do levees have on a stream 23 What processes can lead to the failure of a river levee 24 What constitutes channelization and what is it intended to do 25 What is avulsion
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