The following table summarizes the number of occurrences of intensities of various durations for a 34 year record of rainfall. Maximum intensities for the given durations were determined for all excessive storms and a count made of the exceedances. Interpolate for the average number of exceedances expected on a 5 year frequency and plot the 5 year intensity-duration-frequency curve.
The second part of the problem is:
Fit the formula i = A/(t + B) to the data derived in the above for the 5 year intensity-duration-frequency curve. (Where i = intensity; and t = time or duration)
I have not gotten anywhere with this problem. I do not know where to begin.
--------------- Intensity--------------
| Dur | 1.0 | 2.0 | 3.0 | 4.0 | 5.0 | 6.0 | 7.0 |
| 5 | 73 | 48 | 21 | 9 | 2 | ||
| 10 | 68 | 51 | 26 | 11 | 3 | 1 | |
| 15 | 72 | 35 | 23 | 11 | 5 | 1 | |
| 30 | 29 | 17 | 7 | 3 | 1 | ||
| 60 | 15 | 6 | 2 | 1 | |||
| 120 | 8 | 1 |
The second part of the problem is:
Fit the formula i = A/(t + B) to the data derived in the above for the 5 year intensity-duration-frequency curve. (Where i = intensity; and t = time or duration)
I have not gotten anywhere with this problem. I do not know where to begin.
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