|
<br />54
<br />
<br />24,000
<br />
<br />Q
<br />~ 20.000
<br />u
<br />"'
<br />'"
<br />..
<br />"'
<br />..
<br />I-
<br />~ 18.000
<br />u
<br />iii
<br />:>
<br />u
<br />~
<br />:j 12,000
<br />..
<br /><(
<br />:z:
<br />u
<br />'"
<br />2i
<br />"
<br /><( 8000
<br />~
<br />
<br />LAWN LAKE DAM AND CASCADE LAKE DAM FAILURES, COWRADO
<br />
<br />
<br />NOTE: R.sults Ir. for IIctuat
<br />breach dimensions
<br />
<br />\
<br />\
<br />\
<br />\~
<br />'",-
<br />'\~
<br />'\~
<br />"
<br />'-.
<br />'-.
<br />........
<br />. lake Oam ........
<br />
<br />
<br />.......
<br />""
<br />
<br />4000
<br />o 30 80 90 120
<br />TIME TO FUll 8REACH DEVELOPMENT, IN MINUTES
<br />
<br />F1GUIlB 47.-Outflow discharge for various timas of breach
<br />development for Lawn Lake dam end Cascade Lake dam,
<br />
<br />TABLE 10.-Comparison of model results of a hypothetical breach width of 25 fset to tho actual
<br />breach width of 65 fe.t
<br />
<br />O_in_
<br />disclwp from
<br />.......--
<br />in cubic teet per
<br />.......
<br />
<br />0_.......
<br />etream from Lawu
<br />Lake dam, ia
<br />.....
<br />0.0
<br />.55
<br />1.50
<br />3.33
<br />b 4.73
<br />
<br />5.36
<br />5.78
<br />c 6.50
<br />d 6.67
<br />e 7.68
<br />
<br />Peak diacbarp, iD
<br />cubic feet per
<br />.......
<br />11,000
<br />10,000
<br />9,400
<br />8,500
<br />8,400
<br />
<br />7,500
<br />5.600
<br />5,200
<br />15,500
<br />9,500
<br />
<br />.7,000
<br />-6,600
<br />-5,800
<br />.4,100
<br />.3,400
<br />
<br />.3,400
<br />-1,900
<br />.1,600
<br />-600
<br />.400
<br />
<br />100 150 200
<br />BREACH WIDTH. IN FEET
<br />
<br />FIGUIlB 48.-OutfIow discharge for bypotheticel breach width for
<br />Lawn Lake dam, assuming lo-minute time of failure.
<br />
<br />Is) (a)
<br />(s) (a)
<br />(s) (a)
<br />(a) (a)
<br />8,514.7 9.8
<br />8,510.3 9.3
<br />8,492.3 9.7
<br />8.054.8 9.8
<br />
<br /> 50,000
<br />Q
<br />Z
<br />Q 40,000
<br />u
<br />"'
<br />'"
<br />..
<br />~
<br />I-
<br />"'
<br />"' 30,000
<br />~
<br />!.!
<br />..
<br />:>
<br />u
<br />iii
<br />ui 20,000
<br />'"
<br />..
<br /><(
<br />:z:
<br />u
<br /><Il
<br />2i
<br />" 10,000
<br /><(
<br />"'
<br />..
<br /> 0
<br /> 0
<br />
<br />Flood elevatioD, ill
<br />....
<br />
<br />
<br />
<br />NOTE: Results If. for II time of
<br />failure of 10 minutes
<br />
<br />50
<br />
<br />250
<br />
<br />M_fIood
<br />dopth. in ....
<br />
<br />JlHfwoDce ""'"
<br />......... flood
<br />depth of 56-loot
<br />width. in feel
<br />
<br />(a)
<br />(a)
<br />(a)
<br />(a)
<br />
<br />-.9
<br />..9
<br />..9
<br />
<br />'.1
<br />
<br />7.74 9,300 .400 8,042.8 10.8 -.2
<br />8.78 6.700 0 7,862.7 10.7 ..1
<br />f 10.28 6,200 .1,400 7,697.9 8.9 -.7
<br />g11.45 4,800 .1,300 7,579.8 6.8 '.5
<br />h12.50 4,800 .1,300 7,502.3 9.8 .1.3
<br />Average difference from meximum flood depth of 5Hoot width, in feat=-,6
<br />
<br />as.vere ch8DIUIl 8I'OIioa: computatioas aad. COl:Dpariaou are not applicable.
<br />bSynthetic croa HCtioa bued OD CI'OSlII seetioD at. riVer mile 5.36.
<br />cSite1.
<br />dcaseadll Lake dam and Site 2-
<br />'SIta3.
<br />fSite....
<br />'SiteS.
<br />.....S,
<br />
<br />1-<6
<br />
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