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<br />H01: Hygroscopic seeding does not affect the probability that rain will fall <br />somewhere in the target area in the first hour after seeding commences. <br /> <br />H02: Hygroscopic seeding does not alter the mean area covered by rainfall during <br />the experimental unit. <br /> <br />H03: Hygroscopic seeding doe8 not alter the total rainfall volume per experimental <br />unit. <br /> <br />H04: Hygroscopic seeding does not alter the rainfall in the downwind area. <br /> <br />Rejection of the four null hypotheses will signify the following: <br /> <br />H11: Hygroscopic seeding causes rain to fall from clouds that would not otherwise <br />produce rain. <br /> <br />H12: Hygroscopic seeding increases the areal extent or duration of natural rain <br />showers. <br /> <br />H13: Hygroscopic seeding increases the total amount of rainfall per experimental <br />unit. <br /> <br />H14: Hygroscopic seeding-produced increases in experimental unit rainfall either <br />merely redistribute the rainfall that would have fallen naturally or enhance <br />downwind rainfall as well. <br /> <br />3.8 General Experimental Design <br /> <br />The warm cloud seeding demonstration project will be conducted in accordance with a <br />randomized crossover design (appendix E). Two pair&. of target areas (fig. 3.1) have been <br />selected: a western pair (TA-W1 and 'TA-W2), which is suitable for use during the morning <br />hours; and an eastern pair (TA-EI and TA-:~2), which is suitable for use during afternoon <br />hours. Control and downwind areas have been selected for each target pair (appendix E). <br />Thus, more than one experiment can be conducted on any given day, cloud conditions and <br />logistics permitting. <br /> <br />3.9 Specification of Design. Variables <br /> <br />3.9.1 Experimental unit <br /> <br />The experimental unit will be the assemblage of all clouds that occur in the target areas <br />during a 3-hour period; sometime during 0900 to 1300 LST for the west target pair and some <br />time during 1300 to 1800 LST for the east target pair. <br /> <br />3.9.2 Treatment units <br /> <br />The treatment units are all clouds within an experimental unit that are actually treated. <br /> <br />27 <br />