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<br />.1 <br />J <br />" <br />i <br />, <br />I <br />I <br />I <br />t <br />t <br />i <br />I <br />J <br />, <br />t <br />I <br />t <br />,I <br />1 <br /> <br />very short duration episodes (2 hours or less) is compared <br />to those with durations of three hours or more. It ~s evident <br />that without the very short duration episodes 25 percent <br />of the episodes last three hours and 50 percent of them last <br />up to six hours. This is more than twice as long as the sample <br />that includes the one and two hour long episodes. In the <br />smaller sample, 75 percent of the episodes last up to 11 hours <br />compared to 7.5 hours for the sample containing all the episodes <br />(over 40 percent longer), while 90 percent of the episodes <br />last up to 21 hours compared to 16 hours for the entire sample <br />size (over 30 percent longer). <br /> <br />Precipitation hours are slightly greater with the elimination <br />of the 1 and 2 hour episodes with 2 to 3 hour increases indicated <br />through the 75 percent level. More precipitation falls during <br />a shorter time when the very short duration episodes are eliminated <br />with 25 percent of the total precipitation falling within <br />7.1 hours compared to 9.5 hours for the whole sample but in <br />both sample sets 50 percent of the total precipitation falls <br />within 21 hours. <br /> <br />Not surprisingly, this analysis suggests the better organized <br />precipitation periods are likely to continue for a number <br />of hours. All other factors being equal, these periods would <br />likely be better candidates for seeding than would the shorter <br />more disorganized periods. <br /> <br />3.2.9 <br /> <br />Episode Precipitation Total <br /> <br />when the precipitation episodes were examined on the <br />basis of total precipitation during the episode, approximately <br />half (117 of the 217 episodes or 54 percent) of all the episodes <br /> <br />3-48 <br />