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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />are suggested as guidance in considering when to suspend the <br />randomization of seeding: <br />(1) If the past two consecutive water years' average <br />precipitation amounts were calculated to be 20 <br />percent or more below average, or <br />(2) If the preceeding '\Tater year's average precipitation <br />amount was calculat.ed to be 40 percent or more below <br />average. <br />All suitable weather units would have observable meteor- <br />ological parameters monitored throughout the duration of the unit <br />whether the unit is seeded or not. An established consistent <br />format for monitoring the continuity of input parameters for each <br />selected potential seeding operation will allow non-seeded events <br />to be assessed equally to all seeded events in the final evaluation <br />of the program. If at a latE~r time in the duration of this program <br />a few of the decision-making parameters should be changed slightly <br />to better fit with current rE~search findings, a new set of evalua- <br />tion data can be determined from the required, precise and compre- <br />hensively documented records maintained during each seeding <br />operation. <br />A decision tree presented in Figure 7 portrays the flow of <br />information and data through the input stages, through the random- <br />ized decision stage, and through the completion of each operation. <br />So as to determine a consistent method of comparing the <br />precipitation changes in and around the seeded region on seeded <br />and non-seeded days, the precipitation amounts over the pot~ntial <br />area of effect recorded for i:he same hour that the generator <br />network was (or would have been) first turned on until three hours <br />after the generator network ~yas turned off will be considered as <br />being treated by that operational decision. For example, the <br />seeding generators are turned on at 0910 hours in the morning and <br />run until 2000 hours in the evening. The precipitation data to <br />be associated with this operation would be the accumulation <br />starting from 1000 hours (amount observed from 0900 to 1000 hours <br />recorded at 1000 hours) to 2300 hours (The amount observed from <br />2200 hours to 2300 hours recorded at 2300 hours). This correlation <br /> <br />-33- <br />