9493

• UCREFRP Catalog Number: 9493
• Author: Gaeuman, D., P. R. Wilcock and J. C. Schmidt.
• Title: High Flow Requirements for Channel and Habitat Maintenance of the Lower Duchesne River between Randlett and Ouray, Utah.
• USFW Year: 2003.
• USFW - Doc Type: \
• Copyright Material: NO

FINAL REPORT, November 2003
High-jlow Requirements for the Duchesne River

LIST OF TABLES

Table 1: Geomorphic mapping units............................................................................................. 31
Table 2: Aerial photographs used in the study.............................................................................. 32
Table 3: Erosion/deposition classes. ............................................................ ................................. 32
Table 4: Positional errors for individual coverages. ..................................................................... 33
Table 5: Potential and uncompensated planimetric error for coverage overlays.......................... 33
Table 6: Longitudinal variation in map unit deposit thickness in meters. .................................... 34
Table 7: Percent uncertainty margins (plus or minus) for reporting volumes of
gravel erosion, gravel deposition, and changes in gravel storage................................................. 35
Table 8: Roughness parameters used at cross sections for high-flow extrapolation. ................... 36
Table 9: Changes in flow regime after 1925................................................................................. 89
Table 10: Variability between upper-quartile, lower-quartile, and middle-quartile years

from 1943 to 2000. ................................................ ............................... ........ .............. ................... 89

Table 11: Flow variability between wet and dry cycles since 1950. ............................................ 90
Table 12: Changes in discharge since construction ofthe Bonneville Unit of the

Central Utah Project.................... ......... ........................................................... ............... ........ ....... 90

Table 13: Flow characteristics by photograph interval................................................................. 91
Table 14: Suspended sediment loads in wet, dry, and normal years. ........................................... 91
Table 15: Longitudinal zones of the lower Duchesne River......................................................... 92
Table 16: Surface layer particle sizes. ..........................................................................................92
Table 17: Subsurface particle sizes............................................................. .................................. 92
Table 18: Discharges to access topographic features of point bars in ft3/S................................... 93
Table 19: Critical shear stress for gravel entrainment. ................................................................. 93
Table 20: Channel changes by photo period.................................................................................94
Table 21: Cumulative changes in gravel storage in Zones 2-4 for six

time intervals.............................. ........................................................................................ ........... 95

Table 22: Magnitude-duration of channel-forming flows and erosion activity

rates through time. ............................ ............................................................................ ................ 95

Table 23: Proposed flow regime for channel and habitat maintenance. ..................................... 126

v