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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 budget <br />for Marble Canyon. C, Modeled sand budget for eastern Grand Canyon ....................................... .............................11 <br />Figure 9. Modeled annual sand budgets for the 11.0 million acre -foot annual release volume. A, Sand budget for <br />Marble Canyon. B, Sand budget for eastern Grand Canyon .......................................................... .............................14 <br />Figure 10. Modeled annual sand budgets for the 8.23 million acre -foot annual release volume. A, Sand budget for <br />Marble Canyon. B, Sand budget for eastern Grand Canyon .......................................................... .............................15 <br />Tables <br />Table 1. Modeled sand budgets for 11.0 million acre -foot annual release volume ................... .............................16 <br />Table 2. Modeled sand budgets for 8.23 million acre -foot annual release volume ................... .............................17 <br />v <br />