WSP12639

• File Number: 8220.101.10.A
• Description: Colorado River - Water Projects - Glen Canyon Dam-Lake Powell - Glen Canyon AMWG
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 10/1/2004
• Author: Schmidt - Topping - Grams - Hazel
• Title: System-Wide Changes in the Distribution of Fine Sediment in the Colorado River Corridor Between Glen Canyon Dam and Bright Angel Creek - Arizona - Final Report - 10-01-04
• Water Supply Pro - Doc Type: Report/Study

5000 A. 3000
,. ... ,. .,. .,. B.
pre-dam post-dam fi lling environmental
Lake Powell management .
2500
9 4000 c full reservoir
0 2
0 objective
u u
w w
'n '"
a: a: 2000
w W
<l.. Il.
'" JOOO ~ '"
a: a:
w w
l- I-
W W
- :;; 1500
u u
Ci ~
::J
U 2000 "
; 0;
w w 1000
" 0
a: a:
<( ::;
:I: i3
u
'" 1000,. '"
i5 0
5GO
o -_._-,,-
1&20 1930 1940 1950 1960 1970 1980 1990 2000 1965 1970 1975 1980 1985 1990 1995 2000
3000 c. 3000
D.
. . ~
2500 2500
a 9
2 a
0
u u
w Channel cleaning flow w Post-dam floods
'" 2000 '"
a: / a: 2000
w u, /j \
Il. Il.
'" '"
a: a:
w w
l- I-
W ~
-" 1500 1500
u u .
ro Ci
::J :>
<.J U
0; 0;
W 1000 W 10'30
0 0
a: a:
<( S
5 u
'" 'n
i5 6
500 . 500

1964 1966

1970 1972 1974 19'76 -1978 1f:'8~

3000

,

. ,

,

25QO

2000

15QO

River-scale
experiments

/

1996
Controlled
Flood

Experimental
releases

1\
~J

1000

590

o
1;90

1992

1994 1996

1 So93 2-)00

1982

1~)e4

19~5

1988

19S!

E.

Figure 2. Graphs showing instantaneous discharge of
the Colorado River at the Lees Ferry gage (Topping et
aI., 2003). A. entire period of record. B. Post-dam era.
C. Period during which Lake Powell was filled. D. Period
after Lake Powell reservoir had filled for the first time. E.
Period of modern environmental management. Arrows
indicate times when post-dam aerial photographs were
taken.

.

4 System-wide Changes in the Distribution of Fine Sediment in the Colorado River Corridor...