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<br /> <br />~::-1-+-:-+-li--+-:-+-~:-+r:-~ <br /> <br />D <br />68 . <br />I-i-~' 47 <br />: I-l <br />':-r.'\'\ <br />~~-~a?' <br />,_-I--+-t'" <br />, . <br />'- <br /> <br />32 -:- <br />117 <br /> <br />1__1_ 1 1 1 1 I -pIlI _1_ <br />" 1- -1- -1- T -.- -- - .;.-;..~.. <br />t -:- -:-(+ -'- <br />=t _1- _L <br />'\' , <br />1_1_ _1_ <br />~ ' <br />........ <br />, <br /> <br />EXPLANATION <br /> <br />- <br /> <br />Regional boundary <br /> <br />o <br /> <br />.... <br /> <br />500 .....5 <br /> <br />e Region <br /> <br />. <br /> <br />.so <br /> <br />500 KILOMETERS <br /> <br />Digital ban from U.S. GeolOgical Survey 1:2.000,000, 1970 <br />Abet1 equal-area pro;ection based on atandard paraleII 29.5 and 45.5 degrees <br /> <br />Figure 3. Map of the contenninous United States showing flood-region boundaries. (From Crippen and Bue, 1977.) <br /> <br />16 NallDnwlde Summory DI U.s. GeolDglcal Survey RaglDna' Ragre..IDn EquellDna IDr Eatlmatlng Magnitude and Frequancy DI <br />Flood. IDr Un1l891d 511.', 1993 <br />