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2s 000 <br />20. 000 <br />1 S, 000 <br />10. <br />a � <br />5,001 <br />Scenario 2: SDI A <br />000 X823 MAF <br />—11.0 MAF <br />OCT Nov DEC IAN FEB MAR APR MAY JUN JUL AUG SEP <br />0 <br />1200 <br />1 1 <br />1 1 1 <br />1 1 1 <br />B <br />/ <br />23 MAF <br />Marble Canyon <br />800 <br />Accumulation <br />W <br />' <br />....... <br />/ • <br />11.0 MAF <br />...... . ........... <br />— — — — <br />-_ - �. <br />z <br />Erosion <br />z <br />OCT NOV <br />DEC JAN FEB MAR <br />APR MAY JUN JUL I AUG <br />L SEP <br />-1200 <br />800 <br />C <br />600 <br />Eastern Grand Canyon <br />400 <br />Accumulation <br />— — — — — — — — — — — — <br />— — — — <br />— — <br />8.23 MAF <br />200 <br />_ <br />— - - <br />- <br />F <br />0 <br />. <br />io -200 <br />I <br />- — — <br />— — — — <br />— <br />- <br />11.0 MAF <br />-400 <br />Erosion <br />r <br />? -600 <br />OCT NOV <br />DEC )AN FEB MAR <br />APR MAY JUN JUL I AUG <br />SEP <br />_800 <br />EXPLANATION (panels B and C) <br />-- Base simulations <br />- - - - -- Uncertainty simulations <br />--------- Zero budget line (no net change) <br />Figure 4. Glen Canyon Dam (GCD) flow releases and model results for Steady Daily Flow (SDF) operations at <br />8.23 and 11.0 MAF annual release volumes. A, GCD hourly hydrograph. 8, Modeled sand budget for Marble <br />Canyon. C, Modeled sand budget for eastern Grand Canyon. MAF, million acre -feet <br />