Using the semi-log graph paper provided (or by creating your own in Excel), plot
ID: 287282 • Letter: U
Question
Using the semi-log graph paper provided (or by creating your own in Excel), plot discharge on the y-axis and recurrence interval on the x-axis. Use a ruler to draw a straight best-fit line through the data points. A best fit line is the best line that summarizes all the data to a single line or represents an average. Best fit lines should not connect data points. See the graph below for an example of a best fit line. Best fit lines assist with estimating the value of one variable for a certain value of another variable. For example, we can estimate the discharge with a 20-year recurrence interval by following a line straight up from 20 years on the x-axis to the best fit line and then by drawing a line straight to the y-axis to estimate the discharge value of -64,000 cfs as shown below. 100000 Discharge (cfs) 90000 80000 70000 a 60000 E 50000 å 40000 30000 20000 10000 0 + 10 100 Recurrence Interval 16. Using the graph you plotted, estimate the peak discharge expected for a flood with a recurrence interval of 5 years. I nnnnnn 17. Using the graph you plotted, estimate the peak discharge expected for a flood with a recurrence interval of 50 years. » nnnnnExplanation / Answer
16) The peak discharge at a given time is said to be the amount of discharge at that particular time.
therefore we are asked to find out the peak discharge at recurrence interval of 5 years.
So, by constructing a line from interval of 5 units of recurrence interval (4th point from the origin towards X- axis) till its intersection point on the best fit line, we get the peak discharge at that recurrence value and it is found out to be approximately 45000 cfs.
Hence peak discharge at recurrence interval of 5 years is found out to be around ~ 45000 cfs.
17) Similarly, if we apply the same procedure in this question and construct a line from the recurrence interval of 50 years (13th point from the origin towards x-axis) untill it intersects at a point in the best fit line, then the peak discharge at this recurrence interval can be found out which is approaximately 80000 cfs( from the best fit line shown).
So, the peak discharge at recurrence value of 50 years is ~80000 cfs.
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