8267

• UCREFRP Catalog Number: 8267
• Author: Elliott, J. G. and L. A. Hammack.
• Title: Geomorphic and Sedimentologic Characteristics of Alluvial Reaches in the Black Canyon of the Gunnison National Monument, Colorado.
• USFW Year: 1999.
• USFW - Doc Type: Water-Resources Investigations Report 99-4082,
• Copyright Material: NO

Table 3. Sediment-size statistics and critical shear stress for the median particle size, Warner Point study reach-Continued
[Station, sample location on cross section from left endpoint; Percentile, percentile of the size distribution; lc, sampled across the entire low-flow channel;
^s, not sampled or not calculated; Critical shear for the median sediment size calculated with equation 2; Shields parameter is variable depending on pave-
ment and subsurface properties; ft, foot; mm, millimeters; Ib/ft2, pound per square foot]
Critical Critical
shear shear
16th 50th 84th Maximum with with
Cross Sample Sample Station Percen- Percen- Percen- particle Shields Shields

section
year
code
(ft)
file
file
file
size
param-
param- Remarks
(mm) (mm) (mm) (mm) eter eter
0.030 0.045
(Ib/ft2) (Ib/ft2)
V3 1995 RBank 204 49 110 191 1,240 1.12 1.67 Sample overlaps both V3
and H3.
V3 1995 ROvrFlo 241 8 40 76 760 0.41 0.61
V4 1994 XChan lc 100 270 680 830 2.74 4.11 Sampled from station 79 to
205.
V4 1994 LGrsTer 75 2 9 22 92
V4 1994 LCb1Bar 81 2 20 48 101 0.20 0.30 Subsurface sample,
300-ttun-deep pit.
V4 1994 LBank 85 22 47 118 490 0.48 0.71
V4 1994 RCb1Bar 203 32 72 165 900 0.73 1.09
V4 1994 ROvrFlo 235 17 87 245 580 0.88 1.32
V4 1995 LBank 80 2 38 97 470 0.39 0.58
V4 1995 ROvrFlo 243 39 170 320 1,000 1.72 2.59
H6 1994 REddy 162 9 16 23 38 0.16 0.24 Gravel deposited in 1993
behind large boulder.
H6 1995 REddy 162 15 58 162 300 0.59 0.88
H7 1994 LBank 24 ns ns ns 900 0.00 0.00
H8 1995 ROvrFlo 283 10 25 42 60 ~ 0.25 0.38
VS 1994 XChan lc 70 250 410 550 2.53 3.80 Sampled from station 75 to
219.
VS 1994 LSplay 56 35 55 74 205 0.56 0.84
VS 1994 LBank 80 128 220 350 530 2.23 3.35
VS 1994 RBank 216 38 145 300 550 1.47 2.20
VS 1994 RGv1Ter 273 14 32 52 120 0.32 0.49 Downstream from Box
Elder number 132.
VS 1994 RPtBar 277 26 64 105 500 0.65 0.97
VS 1995 LBar 61 2 160 306 455 1.62 2.43
VS 1995 RPtBar 275 11 50 110 430 0.51 0.76
H9 ns XChan ns ns ns ns ns ns ns Low-flow channel not
sampled.
H9 1994 LBank 86 128 220 350 530 2.23 3.35 Sampled at V5.
H9 1994 RBank 216 38 145 300 550 1.47 2.20 Sampled at V5.
H9 1994 RPtBar 277 26 64 105 500 0.65 0.97 Sampled at VS
H9 1995 RPtBar 275 11 50 110 430 0.51 0.76 Sampled at V5.
GEOMORPHIC AND SEDIMENTOLOGIC CHARACTERISTICS 15