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<br />WATER
<br />WITHOUT FLOODWAyr WITH FLOODWAY
<br />
<br />
<br />FEET (NGVD
<br />
<br />BASE FLOOD
<br />SURFACE ELEVATION
<br />
<br />FLOODWAY
<br />
<br />
<br />SECTION AREA I MEAN VELOCITY
<br />(SQUARE FEET) (FEET PER
<br />SECOND)
<br />
<br />FLOODING SOURCE
<br />
<br />INCREASE
<br />
<br />0.0
<br />1.0
<br />0.9
<br />0.9
<br />0.3
<br />0.3
<br />1.0
<br />0.1
<br />0.0
<br />0.1
<br />
<br />5,264.5
<br />5,271.0
<br />5,275.0
<br />5,279.2
<br />5,287.3
<br />5,293.5
<br />5,297.0
<br />5,302.7
<br />5,308.1
<br />5,316.6
<br />
<br />5,264.5
<br />5,270.0
<br />5,274.1
<br />5,278.3
<br />5,287.0
<br />5,293.2
<br />5,296.0
<br />5,302.6
<br />5,308.1
<br />5,316.5
<br />
<br />REGULATORY
<br />
<br />5,264.5
<br />5,270.0
<br />5,274.1
<br />5,278.3
<br />5,287.0
<br />5,293.2
<br />5,296.0
<br />5,302.6
<br />5,308.1
<br />5,316.5
<br />
<br />9.5
<br />10.9
<br />9.1
<br />4.3
<br />6.9
<br />9.8
<br />7.0
<br />8.0
<br />5.9
<br />2.9
<br />
<br />936
<br />817
<br />973
<br />2,052
<br />1,283
<br />904
<br />1,262
<br />1,117
<br />1,511
<br />3,032
<br />
<br />(FEET)
<br />
<br />205
<br />166
<br />220
<br />608
<br />500
<br />226
<br />251
<br />320
<br />624
<br />597
<br />
<br />WIDTH
<br />
<br />DISTANCE1
<br />
<br />166,708
<br />167,408
<br />167,828
<br />168,708
<br />169,848
<br />170,278
<br />170,688
<br />171,603
<br />172,378
<br />173,167
<br />
<br />CROSS SECTION
<br />
<br />81. Vrain Creek
<br />(Vicinity of
<br />Lyons)
<br />A
<br />B
<br />C
<br />o
<br />E
<br />F
<br />G
<br />H
<br />I
<br />J
<br />
<br />0.0
<br />0.0
<br />0.0
<br />0.0
<br />0.1
<br />0.3
<br />0.7
<br />0.0
<br />
<br />5,334.6
<br />5,343.5
<br />5356.4
<br />
<br />5,334.6
<br />5,343.5
<br />5356.4
<br />
<br />5,334.6
<br />5,343.5
<br />5356.4
<br />
<br />5,370.1
<br />5,378.5
<br />5,401.1
<br />5,411.8
<br />5,419.6
<br />
<br />5,370.1
<br />5,378.4
<br />5,400.8
<br />5,411.1
<br />5,419.6
<br />
<br />5,370.1
<br />5,378.4
<br />5,400.8
<br />5,411.1
<br />5,419.6
<br />
<br />8.4
<br />13.0
<br />7.0
<br />12.0
<br />8.4
<br />9.9
<br />9.4
<br />13.2
<br />
<br />511
<br />331
<br />612
<br />361
<br />516
<br />436
<br />458
<br />327
<br />
<br />157
<br />60
<br />202
<br />98
<br />93
<br />115
<br />113
<br />53
<br />
<br />1,530
<br />2,550
<br />3,500
<br />5,090
<br />6,103
<br />8,721
<br />9,616
<br />10,346
<br />
<br />North 81. Vrain
<br />Creek
<br />A
<br />B
<br />C
<br />o
<br />E
<br />F
<br />G
<br />H
<br />
<br />
<br />
<br />
<br />Feet Above Mouth
<br />
<br />
<br />FLOODWAY DATA
<br />
<br />NORTH ST VRAIN CREEK
<br />
<br />ST. VRAIN CREEK (VICINITY OF LYONS)
<br />
<br />FEDERAL EMERGENCY MANAGEMENT AGENCY
<br />BOULDER COUNTY, CO
<br />AND INCORPORATED AREAS
<br />
<br />:;;!
<br />OJ
<br />r-
<br />m
<br />en
<br />
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