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<br />14. <br /> <br />Controlling Weather Modification Operations (cont) <br /> <br />. <br /> <br />State Patrol, and field maintenance personnel in the seeded areas. <br /> <br /> <br />Changing weather conditions that would indicate the onset of poten- <br /> <br /> <br />tially severe or hazardous weather conditions will result in the <br /> <br /> <br />suspension of seeding operations throughout the duration of these <br /> <br /> <br />potentially hazardous weather conditions. <br /> <br />Snowpack accumulation will be monitored from snow survey measure- <br /> <br /> <br />ments as conducted by the Soil Conservation Service. Special snow <br /> <br /> <br />measurements may be available from selected high mountain sites about <br /> <br /> <br />January I, 1979. Regular snow measurements will commence for all <br /> <br /> <br />snow observation sites on February 1, 1979 and the first detailed <br /> <br /> <br />analysis of snow accumulations in the seeded areas will be completed <br /> <br /> <br />using these measurements. <br /> <br />Recent evaluations of snowpack and snowmelt runoff in the sping- <br /> <br /> <br />time 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 pro~lems can be anticipated when late winter snow- <br /> <br /> <br />packs in excess of 170 percent of normal melt off in the springtime. <br /> <br /> <br />Since this program is designed for reasonable levels of sno_Tack <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 /> <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 200 percent of normal snow- <br /> <br /> <br />pack during the months of November through January. <br /> <br />b. When the average snowpack reaches 175 percent of normal snow- <br />pack during the month of February. <br /> <br />c. When the average snowpack reaches 150 percent of normal snow- <br />pack during the month of March. <br /> <br />Seeding operations would continue in the remaining mountain <br /> <br /> <br />regions under normal operative procedures. This comparative normal <br /> <br /> <br />for these representative snow observation sites will be the latest <br /> <br /> <br />fifteen-year average as published by the Soil Conservation Service. <br /> <br />-10- <br />