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<br />Hueflle and Steuens: Test Flood Effects on Lake Powell
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<br />FIGURE CAPTIONS
<br />Figure 1: Structure of Glen Canyon Dam with location and discharge capacity of outlet structures.
<br />ToO-top of dam, elevation = 1132.3 m; full pool elevation = 1127.8 m; dam base elevation = 958.6 m;
<br />spillways inlet elevation = 1111.9 m, outlet elevation = 962.3 m, maximum disharge (Qmax) =
<br />5891 m3/s; penstocks inlet elevation = 1057.65 m, outlet elevation = 947.6 m, Qmax= 892-940 m3/s;
<br />river outlet works inlet elevation = 1028.4 m, hollow jet valve (HJV) outlet elevation = 967.7 m,
<br />Qmax=425-566 m3/ s.
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<br />Figure 2: Map of Lake Powell with sampling station locations. Utah and Arizona, USA.
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<br />Figure 3: Discharge (m'/s), temperature (oC), conductivity (liS/em), dissolved oxygen (mg/L), and
<br />wind speed (m/s) for 22 March to 23 April 1996 at the penstock draft tubes in Glen Canyon Dam, AZ.
<br />Synchronized oscillations reflect seiche and discharge effects. Blank areas indicate instrument
<br />failure.
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<br />Figure 4: Synoptic channel proflles of Lake Powell, AZ and UT, for conductivity (liS/em, plots A-F)
<br />and dissolved oxygen (mg/L, plots G-L) in winter and spring of 1994 to 1996, comparing seasonal
<br />shifts in chemoclines for the test flood and 2 previous years. Contour interval = 25 IlS/cm for SC,
<br />0.5 mg/L for DO. Penstock, ROWand sampling stations elevations indicated on plot A. Underflows
<br />20WI and 20WU indicated on plots E, F, K and L.
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<br />Figure 5: Temporal isopleths of conductivity (IlS/cm), dissolved oxygen (mg/L) at the Wahweap
<br />forebay station demonstrating upwelling and chemocline migration, 1994 to 1997.
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<br />Figure 6: Detailed synoptic channel proflles to river Ian 90 of Lake Powell, AZ and UT, showing the
<br />advancing front of the 20WI through shifts in conductivity (liS/em, plots A to D) and dissolved oxygen
<br />(mg/L, plots E to H) gradients from 28 February to 21 April 1996. Penstock and ROW elevations
<br />indicated on plot A. Sampling stations indicated on plot B.
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<br />Figure 7: Discharge (m'/s), temperature (oC), conductivity (IlS/cm), dissolved oxygen (mg/L), and pH
<br />for 24 March to 5 April 1996 at Lees Ferry, AZ.
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<br />Figure 8: Percent change per day in Lake Powell for conductivity, temperature, and dissolved oxygen
<br />before, during, and after the test flow from Wahweap to Good Hope Bay, Lake Powell, AZ and UT.
<br />Calculations for absolute values of percentage change per day, including 95% confidence intervals.
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