|
<br />68
<br />
<br />11,006
<br />
<br />11,002
<br />
<br />10,998
<br />
<br />::;
<br />w
<br />>
<br />w
<br />~
<br /><( 10,994
<br />w
<br />"'
<br />Z
<br /><
<br />w
<br />~ 10.990
<br />w
<br />I-
<br /><
<br />::;
<br />X
<br />o 10,986
<br />'"
<br />..
<br />..
<br />~
<br />I-
<br />If: 10,982
<br />~
<br />~
<br />Z
<br />~ 10,978
<br /><
<br />>
<br />w
<br />~
<br />w
<br />
<br />10,974
<br />
<br />10,970
<br />
<br />10,966
<br />o
<br />
<br />11,002
<br />
<br />a 11,000
<br />>
<br />w
<br />~
<br />~ 10,998
<br />"'
<br />z
<br /><
<br />~ 10,996
<br />w
<br />I-
<br /><
<br />::::i 10,994
<br />X
<br />o
<br />'"
<br />..
<br />l1. 10.992
<br />~
<br />I-
<br />w
<br />~ 10,990
<br />~
<br />
<br />z
<br />o 10,988
<br />;::
<br /><
<br />>
<br />w
<br />~
<br />w
<br />
<br />10.986
<br />
<br />10,984
<br />o
<br />
<br />LAWN LAKE DAM AND CASCADE LAKE DAM FAILURES, COLORADO
<br />
<br />LEFT BANK
<br />11,003.99
<br />o
<br />
<br />11,000.45
<br />~
<br />
<br />r--97 feet
<br />(taped I
<br />10.999.62
<br />325
<br />
<br />
<br />11.001.63
<br />1"6
<br />10.998.27
<br />-----m-
<br />10,996.40
<br />10,996.21/
<br />---,.--
<br />10.995,39
<br />90
<br />
<br />11,000.24
<br />296
<br />10.999.54 ./
<br />270 10,999..63
<br />""306
<br />Preflood water 18\1el
<br />(July 15,1982)
<br />
<br />10,999.64
<br />422
<br />11,000.14
<br />I 442 10,999.97
<br />10,999.35
<br />460 "564"
<br />10.999.64 \'0.999.27
<br />426 507
<br />
<br />RIGHT BANK
<br />10,999.49
<br />63il
<br />
<br />10,999.431
<br />620
<br />
<br />10,996.44
<br />
<br />EXPLANATION
<br />GROUND POINT
<br />10995.39 ELEVATION
<br />90 ST A liON
<br />
<br />10.986.60
<br />~
<br />
<br />Earthfil1 with 6- to 12-inch riprap
<br />upstream and downstream
<br />faces
<br />
<br />10.893.10 1098270
<br />-390 ..
<br />400
<br />
<br />Earth'i11 with 6-to 12-inch riprap
<br />upstream and downstream
<br />faces
<br />
<br />10976.30
<br />337
<br />
<br />10975.21
<br />353
<br />Top upstream of outlet pipe 10975.27
<br />
<br />10,974,27 Water level 344
<br />
<br />July 21, 1982 10,972.27
<br />
<br />Bottom of out et pipe 34~ /
<br />~
<br />362
<br />10,974,89
<br />376
<br />Bedrock
<br />
<br />Height of dam 10.998.43 -10,972,27=26.16 feet
<br />
<br />
<br />100
<br />
<br />200
<br />
<br />300 400
<br />STATIONING, IN FEET
<br />
<br />LAWN LAKE ELEVATION ON JULY 21, 1982,
<br />85 FEET UPSTREAM OF DAM
<br />Water surface, 10,975.69 feet
<br />Naturallakebed elevation, 10.974.7 feet
<br />(control)
<br />
<br />10,971.94
<br />390
<br />10974.11
<br />365
<br />
<br />500
<br />
<br />600
<br />
<br />700
<br />
<br />FIGURE 55.-Lawn Lake dam embankment cross section on the Roaring River at river mile 0.0.
<br />
<br />EXPLANATION
<br />
<br />11,000.14
<br />36
<br />
<br />
<br />11,000.14
<br />44
<br />
<br />
<br />30 35 40 45
<br />STATIONING, IN FEET
<br />
<br />FIGURE 56.- Lawn Lake dam cross section of breach (right side) on the Roaring River at river mile 0.0
<br />
<br />.
<br />
<br />
<br />I+- 6 feet -I
<br />
<br />GROUND POINT
<br />ELEVATION
<br />STATION
<br />HIGH WATER MARK
<br />
<br />10,987.47
<br />17
<br />HWM
<br />
<br />Downstream
<br />
<br />10,988.78
<br />o
<br />
<br />
<br />HWM 10987.01 .......10,987.47
<br />17
<br />
<br />5
<br />
<br />25
<br />
<br />15
<br />
<br />20
<br />
<br />10
<br />
<br />10,996.42 Water level
<br />49 July 15, 1982
<br />
<br />Cobble and
<br />boulders
<br />
<br />Upstream
<br />
<br />50
<br />
<br />55
<br />
<br />60
<br />
<br />65
<br />
<br />70
<br />
<br />75
<br />
<br />60
<br />
|