A 14.7-ac multifamily residential catchment in Miami has a total impervious area of 10.4 ac, but it has a hydraulically effective impervious area of only 6.48 ac. The pervious portions of the basin constant of lawns over a Perrine marl, with a very slow infiltration rate. Rainfall and runoff data monitored by the USGS are reported below for 16 storm events. Data from Hardeeal., 1979.

a) Determine a linear relationship between runoff and rainfall using linear regression analysis (least squares). Test the significance of the regression and plot the data points and the fitted line.
b) What is the value of depression storage for this basin?

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Event Rainfall (in.) Runoff (in.) 2.85 1.17 2.08 1.86 1.67 0.53 0.84 1.50 0.70 0.73 2.02 1.56 0.74 0.75 0.61 1.01 1.983 0.657 1.426 1.176 0.668 0.217 0.541 0.900 0.308 0.277 0.712 0.423 0.330 0.238 0.266 0.444 10 12 13 14 15 16