Monitoring data for an Oregon catchment produce the following record of annual precipitation and runoff:
Precipitation, in./yr | Runoff, 1000-ac-ft |
33 | 650 |
42 | 940 |
50 | 1010 |
35 | 740 |
36 | 620 |
44 | 850 |
43 | 980 |
48 | 910 |
37 | 800 |
42 | 990 |
49 | 1280 |
40 | 880 |
41 | 1070 |
55 | 1330 |
45 | 970 |
39 | 800 |
46 | 1040 |
Check Sums: 725 | 15,860 |
(a) Determine a linear relationship between runoff and precipitation using linear regression analysis (least squares). Test the significance of the regression, and plot the data points and the fitted line.
(b) Does this catchment exhibit the characteristics of depression storage or of baseflow?
(c) Do you think this is a large catchment or a smaller one? Assume “large” is an area greater than 100 square miles. Base your assessment on an evaluation of the slope of the fitted line and its units.
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