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What is the difference between one-day probable maximum precipitation and 24-hour probable maximum precipitation?
Wiki User
∙ 12y ago
Rainfall of a day is cumulative rainfall recorded at fix time for past 24 hours. For example rainfall of 26th September at given place in India is amount of rainfall recorded between 3 GMT of 25-9-09 and 3 GMT of 26-09-09.
However rainfall can commence at any time of day say 5 GMT and continued for 5 GMT of next day. Thus rainfall record gets divided one between 5 GMT to 3 GMT and second 3 GMT of next day to 5 GMT conclusion of rain.
It is obvious that 24 hr rain ( 5 GMT to 5 GMT) is more than that of 1 day rain (either 5 GMT to 3 GMT of next day or 3 GMT of next day to 5 GMT conclusion of rains). One day rain is available with Ordinary raingauges (ORG) while 24 hr rain requires Self Recording Raingauges (SRRG). For Design Storm computations 24 hr rain has significance but data record is less than 1 day record.
As a compromize clock hour correction ( 24 hr rainfall / 1 day rainfall ) is worked out for available record where both ORG and SRRG observations are available. The average clock hour correction is then applied over 1 day PMP to get 24 hr PMP value.
N.Y.Apte
Hydrometeorologist
India meteorological Department
Wiki User
∙ 12y ago
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