ON THE FORMULA FOR PROBABLE RAINFALL INTENSITIES IN MAIN CITIES IN JAPAN

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  • 日本主要都市の確率降雨強度式について
  • ニホン シュヨウ トシ ノ カクリツ コウウ キョウドシキ ニ ツイテ

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Abstract

In this paper, the author proposes a new method of computing the rainfall intensity formula of short duration, basing on the “Theory of Probability”, the author has named this new method “Probable rainfall intensity formula”.<br>Furthermore, as a result of applying the new method to the cases in the main cities in Japan, a new formula for the rainfall intensity of short duration in Japan has been derived, that is in the form; I=a/(b+√t) in which, I=rainfall intensity (mm/hr), t=duration of rainfall (5-120min) a and b=Constants.<br>The constants are determined on the basis of the data obtained from more than 26 cities, such as SDNDAI in TOHOKU region down to NAHA in OKINAWA Island in Japan.<br>This formula may be advantageously applicable to the estimation of flood discharges in small drainage areas, especially suitable for estimating the storm sewage.

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