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<br />, <br /> <br />7. Controlling Weather Modification Operations (continued) <br /> <br />the State Patrol, and field maintenance personnel in the seeded areas. <br /> <br /> <br />Changing weather conditions that would ,indicate the onset of potentially <br /> <br />severe or hazardous weather conditions will result in the suspension <br /> <br /> <br />of seeding operations throughout the duration of these potentially <br /> <br /> <br />hazardous weather conditions. <br /> <br />Snowpack accumulation will be monitored from snow survey <br /> <br /> <br />measurements as conducted by the Soil Conservation Service. Special <br /> <br /> <br />snow measurements may be available from selected high mountain sites <br /> <br /> <br />about January 1, 1986. Regular snow measurement will commence for <br /> <br />all snow observation sites on February 1, 1986 and the first detailed <br /> <br /> <br />analysis of snow accumulations in the'seeded areas will be completed <br /> <br /> <br />useing these measurements. Several mutually agreeable snow measuring <br /> <br />sites will be selected throughout the seeding area to montior the <br /> <br /> <br />seasonal change in snowpack. <br /> <br /> <br />Evaluations of snowpack and snowmelt runoff in the springtime <br /> <br />indicate that minor flooding and stream flow problems can exist <br /> <br /> <br />when late winter snowpacks reach 150 percent of normal. More sub- <br /> <br /> <br />stantial flooding problems can be anticipated when late winter snow- <br /> <br />packs in excess of 170 percent of normal melt off in the srpingtime. <br /> <br /> <br />Since this program is designed for reasonable levels of snowpack <br /> <br /> <br />enhancement for an outlook of an adequately abundant summertime water <br /> <br /> <br />supply for storage and use, we propose to suspend seeding operations <br /> <br />in any major portion of a seeding area when one or more of the <br /> <br /> <br />following occurrences takes place: <br /> <br />a. When the average snowpack reaches 165 percent of normal <br /> <br />snowpack through_ December and 150 percent o( normal for January. <br /> <br /> <br />b. When the average snowpack reaches 140 percent of normal <br /> <br />snowpack during the month of February. <br /> <br />c. When the average snowpack reaches 135 percent of normal <br /> <br />snowpack during the month of March. <br /> <br />Seeding operations would continue in the remaining mountain regions <br /> <br /> <br />under normal operative proceudres. This comparative normal for these <br /> <br />representative snow observation sites will be the latest fifteen-year <br /> <br /> <br />average as published by the Soil Conservation Service. <br /> <br />24 <br />