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25,00, <br />0 <br />20" <br />i� <br />yq� i S.00, <br />S <br />10,00, <br />a s.0a <br />V <br />N <br />m <br />N 2' <br />z <br />loo <br />Soo <br />Accumulation <br />400 <br />, <br />Q <br />400 <br />Erosion <br />-500 <br />vN <br />OCT NOV <br />fv <br />o� <br />a ?3 - <br />N is <br />Marble Canyon B <br />/ 8.23 <br />. .�. . . <br />l.c <br />DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br />i0D � <br />sOp Eastern Grand Canyon C <br />,00 Accumulation <br />too , _ _ _ _ _ _ _ �- 8.23 <br />ou u�V . .......................�- .�'.�. <br />200 <br />11.0 <br />Erosion <br />OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br />MAF <br />! i� <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 8. Glen Canyon Dam (GCD) flow releases and model results for Increased Daily Range and Down Ramp <br />(IDR) operations at 8.23 and 11.0 MAF annual release volumes. A, GCD hourly hydrograph. B, Modeled sand <br />budget for Marble Canyon. C, Modeled sand budget for eastern Grand Canyon. MAF, million acre -feet <br />11 <br />