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25.000 <br />20.000 <br />O <br />1 S.000 <br />10.000 <br />5.000 <br />X <br />0 <br />Scenario 4: SYR &23 MAF A <br />1 t.0 MAF <br />OUT NOV OEC JAN FES MAR APR MAY JUN I JUL AUG SEP <br />1200 <br />800 <br />^ Accumulation <br />400 <br />-400 T <br />Erosion <br />3 <br />o T ww DEL JAN <br />z <br />0 <br />Y <br />r <br />x- <br />- 1 / 8.23 MAF <br />Marble Canyon i <br />11.0 MAF <br />. l T. <br />FEB MAR APR MAY JUN JUL AUG SEP <br />100 1 1 1 r— - I I <br />loo Eastern Grand Canyon C <br />100 Accumulation <br />♦ ... �. K- — 823 <br />0 _ — <br />° 11.0 <br />t00 Erosion <br />500 <br />OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br />MAF <br />MAF <br />EXPLANATION (panels B and C) <br />-�-- Base simulations <br />- - - - -- Uncertainty simulations <br />Zero budget line (no net change) <br />Figure 6. Glen Canyon Dam (GCD) flow releases and model results for Steady Year Round (SYR) operations at <br />8.23 and 11.0 MAF annual release volumes. A, GCD hourly hydrograph. B, Modeled sand budget for Marble <br />Canyon. C, Modeled sand budget for eastern Grand Canyon. MAF, million acre -feet <br />9 <br />