Abstract
The maximum daily rainfall values for 36 homogeneous stations in the northeast of Iran were adopted to estimate the appropriate Probable annual Maximum Precipitation 1-day precipitation (PMP24) values. PMP24 was found as 128.2–284.2, 62.7–160.2 and 124 mm for Hershfield 1, Hershfield 2 and multi-station approach, respectively. The ratio of PMP24 to the highest observed 1-day rainfall was consistent for the second approach of Hershfield. It was in harmony with the multi-station method, but varied widely for Hershfield 1. This may be the result of different record length effect on Hershfield 1 approach. Finally, the map of PMP24 isochrones was prepared for the second approach of Hershfield for over northeast of Iran.
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