14 afe司 曰68l®囫@ 162% exercise 43 problems the following questions are based on the rating curve and streamflow data for cache creek 1. using the data in figure 43-2, calculate the recurrence interval for cache creek's stream- figures 43-1 and 43-2): flow for the years 1990, 1997, 2003, and 2013. once you have calculated the recurrence intervals, fill in your answers below and in figure 43-2 (round your answers to 1 decimal place). 1990: years 1997: ears 2003: yers years 2013: years -years 2003: years 2. determine the flood frequency curve for cache creek by plotting the "recurrence inter- val" against "peak discharge" on the chart below (note that the recurrence interval scale is logarithmic). (hint: your plot of data points should form a nearly straight line, so first plot the three largest floods, and then the three smallest-the rest of your points will line up along this trend.) using a ruler, draw a straight line through the center of your plot, try- ing to have as many data points below the line as above. flood frequency curve for cache creek, 1980-2015 500 450 400 350 300 250 200 course d prvacy poky pensionssupport feedback 韃 @.@,' doll