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<br />w <br />o <br />UI <br />0) <br /> <br />The quantities of adoitional sediment tnat ar8 I iKely to 0e <br /> <br />Supplied to the study r9aches ~y socioeconomic aevelapmeni in the <br /> <br />year 2000 rlithout the estaolisnment of emer~in~ ener9i teChnologies <br /> <br />are listed by source in the riSht-hand col..Jmn in each taole. The <br /> <br />adoitional sediment loaoings were computed oy estimating tne ared <br /> <br />disturbed by tne level of various activities. and then assumin] an <br /> <br />erosion rate ana rate of land recovery or reclamation. <br /> <br />It was <br /> <br />assumed that 25 acres of land would be oisturbed for every 1 mil I ion <br /> <br />tons of surface-mined coal. and 5 acres rloula De disturoeo for <br /> <br />",very 1 million tons of unaergrouna-mined coal (.'.ndr",ws. 1~7d). <br /> <br />These estimates incluoed tne land aisturoea Dy actual mining plus <br /> <br />that disturb"'d oy associated roaas. railroadS. and maintenance <br /> <br />:lara,; . <br /> <br />It was estimated that O.5-dcre-per-person woula ~e aisturbea <br /> <br />due to population growth. <br /> <br />Sediment yielas from disturbea lands <br /> <br />were assumed to increase by ~,OOO tons per square 'nile per year <br /> <br />Juring the first 5 years following aisturbance. ana 2.000 tons per <br /> <br />square mile per year during the second 5 years fol lowing disturbance <br /> <br />..-' <br />(Andrews. 1978). <br /> <br />~fter 10 years. the seaiment yield was assumed <br /> <br />to have return",a to its pre-aisturoea 1evel. <br /> <br />31 <br />