pera E AS SEED Intensities of radiation within such areas may be assumed to be least on the edges and greatest toward the cente#, but actual levels will have to be determined by radiological] The following principles should be borne monitoring. $n mind in developing civil defense plans: A. Evacuation Advisory Bulletin No. 158 and Supplement . il, indicate that the feasibility of evacuation is for city dekermination and recommend that each city study its own problems d develop evacuation plans in accordance with certain princkEples which are delineated. Megaton range weapons with their grehter blast and thermal damage areas emphasize the initial objective of evacuation which is to escape these effects, Residual radiafion hazards from fallout may be avoided to a considerable degree b¥ the extension of the basic principles of evacuation planning, combination with the location and designation of shelter and dover, The following principles are recommended f@r consideration in adapting evacuation plans to the fallout threaq: 1. The fallout prediction plot will be useful in determining the general direction and distance to move. More tion and quantitative appraisal will be possible continued meteorological analysis of data on hand they are obteined, Bccurate predica result of Bnd new data as Since any prediction is susceptible to error, however, post-attack actions which depend on freedbm from radiation hazards should generally be initiated only on the sis of radiological monitoring results. 2. Several or year-round average data on wid directions including high-level winds may be obtained from weg@ther stations and will be useful in locating permanent installatfions, such 4s control centers. These date, however, should not fe used to determine the direction of movement of people. - le - phen IED wo eect 7 ,