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<br />003488 <br /> <br />the similarity of storros identified from soundings is accepted, the <br />increases in seasonal water content that seeding might produce can be <br />computed by employing the Rhea model. <br /> <br />Percentage increases for each basin were calculated by: <br /> <br />1. Summing model-deterrnined contributions to snowfall for all <br />identified storros for each of the 13 winters (Sum 1). <br /> <br />2. Increasing the contribution of each seedable event by 25 percent <br />and then summing (Sum 2). 'lWenty-five percent is the increase in <br />precipitation reported by Mielke et a1. (1981) for all seeded <br />storros with 500 mb temperatures warmer than or equal to -20 <br />degrees C. <br /> <br />3. Computing the percentage increase of Sum 2 over Sum 1. <br /> <br />Figures 8-11 show the percentage increases in maximum spring <br />. <br />SI10WCQurse water content that seeding theoretically cou1.d have prodUCed in <br />each basin during each of the 13 winters. Winters are ranked from driest <br />(left) to wettest (right) for each sub-region. Figure 9 shows, for <br />example, that the percentage increase in maximum spring water content in <br />the Piedra drainage basin is five percent in 1971-72 and 10 percent in <br />1970-71. 'lhese percentages are based on the assumption that all storms <br />meeting our modified Cllinax criteria are seeded. <br /> <br />Percentage increases for each basin vary considerably during the 13 <br />winters. Increases for all basins range from 2.5 percent to 10.5 <br />percent. '!he 13-year average (denoted by the symbol X in each figure) for <br />each basin varies from 5.4 percent in the Uncornpaghre River drainage basin <br />to 8.2 percent in the Rio Grande drainage basin. EKcept for the <br />uncompaghre, percentage increases are generally higher for the basins in <br />the south sub-:region than elsewhere. '!his indicates that the storros that <br /> <br />29 <br /> <br />. , <br />