Point rainfall data collected by a station can be processed and produce a helpful tool in predicting future rainfall.
First, we need to rearrange the rainfall depth data in descending order. Then, we may use Weibull formula, or other alternatives such as California formula to calculate the probability of exceedance for each of these rainfall depths. Average recurrence interval or return period can be calculated subsequently.
From here, we can plot a graph of rainfall depth against return period, which enable us to predict the likelihood of any rainfall over the coverage area for the rainfall gauge station we studied.
The following shows the worked example to determine the point rainfall frequency of a station. Watch the video above for full detail.
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