FLOOD00150

• Designation Number: 579
• County: Gunnison
• Community: Marble and Vicinity
• Stream Name: Crystal River
• Title: Floodplain Information Report - Crystal River Technical Appendix
• Date: 8/1/2004
• Prepared For: CWCB
• Prepared By: Icon Engineering, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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Manning's n values
su nVal SU
o .06754.77

num_ 3
nval Stll
.035 798.32

n val
,06

coeffContr. EX))an.
.1 .3

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Banksta: left Right lengths: Left channel Right
754.77 798.32 894.82849.72 700.27
IneffeCtiveFlcr.e nWll- 2
StaL StaR ElCv permanent
0583.897942.6 T
818.552676.647943.85 T

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CROSS SECTION OUTPUT
e~r' tl~~~V (~W
1'1,5. Elev (ft)
cdt \11.5. eft)
E,G, Slope (ft/ft)
Q Total (cfs)
~~~ ~~~~~ H~Js)
Mixchlopth(ft)
conv.Total Ccfs)
Length\lltd. (ft)
MinChEl (ft)
Alpha
Frctnloss(ftl
C & E LOSS (ft

profilel100-year
7942.86 Element
1.15 lo/t.n-val.
7941.71 Reachlen. (ft)
7<:l4L71 F1O'HAru(sqft)
0.008683 Area (sq ft)
1691.00 Flow ~cfs)
1886.08 TOp Width (ft)
6.58 Avg. vel. (ft/s)
5.39 Hydr.oepth(ft)
18147.5 COnY. Ccfs)
849.75 wetted Per. (ft!
7938.13 shear(lb/sqft
1.71 5treampower(1/fts)
4.n Cum volume (aca-ft)
0.26 cum SA (acres)

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LeftOB
0.060
894.82
7~.UI
86.0,
111.50
97.98
2.20
0.93
1840.5
84.13
0.50
1.10
1In.27
48.30

CrystalRiver.rep

Channel
0.035
849.72
155.85
155.85
1442.45
43.55
9.26
3.58
15480.1
43.55
1.94
17.95
96.91
25.42

Rig~66gB
700.27
B.08
7569.52
77.05
1744.55
3.34
1.81
826.9
13.26
0.94
3.15
141.39
56.84

warning: The energy equation could nat be balanced within the specified number of iterations. The
proQram used critical depth for the water surhce and continued an with the calculations.
warning: Oivlded flow computed for this cross-section.
warning: The veloc:ity head has changed by more than 0.5 ft (0.15m). This may indicate the need for
additional cross sections.
Warning: The conveyance ratio (upstream conveyar:ce divided by dllWf1stream conveyance) is less than
0.7 or ~reater than 1.4. Ttris may indlCate the need far additiona) cross sectiorls.
warning: The energ:( lass was greater than 1.0 ft (0.3 m). between the current and previous cross section.
This may lndicate the need far additional croS5 sections.
warning: During the standard step iterations, when the assumed water surface WaS set e9ual to critical
depth,thecalculatedwatersurfacecamebackbelowcriticaldepth. Thisindlcates that there is
notavalidsubcriticalanswer. The program defaulted to critical depth.

CROSS SECTION OUTPUT profi1elcFloodway
~~~'~~:iv{~W 7942.99 Element Left 08 Channel Rig~&r.b8
L28 OIt.n-val. 0.060 0.035
~;~t ~~~~ ~m 794L71 Reachlen. (ft) 894.82 849.72 700.27
794L71 Flow Area (sq ft) 77.77 155.68 5.62
E.G. slope {ft/ft) 0.009407 Area ~s1 ft) 85.67 155.68 5.62
Q Total (cfs) 1691.00 Flow c s) 177.42 1498.69 14.89
~~f ~~~~~ unS) 143,04 TOP Width (ft) 97.81 43.5$ 1.68
7.07 ~;a;.Vi:~;'t~f~m 2.28 9.63 2.65
Max chl Opth (ft~ 3.57 0.93 3.57 3.35
Cony. Total ~ds 17434.7 cony. (cfs) 1829.3 15451.9 153.5
length Wtd. ft) 851.19 wetted per. (ft~ 84.02 43.55 4.86
loIin ell e.l (ft) 7938.B s,ru.i1.r{lb/sqf't 0.,,4 2.10 0.68
Alpha 1.65 streampower{1/fts) 1.24 20.21 1.80
Frctn lOSS ~ftj 3.24 cum Volume (acre-ft) 29.76 106.97 22.46
C"'Eloss ft 0.32 cum SA (acres) 11.60 25.42 8.18

The energy equation could not be balanced with,n the specified number of iterations., The
proQram used crltical depth for the water surface and continued on with the calcuhtlons.
oiv1ded flow computed for this cross-section.
The velocity head has changed by more than 0.5 ft (O.H m). This mayindicau the rI....d for
additionalcrQsssectiol'ls.
The conveyance ratio (upstreamconveyancedividedbydllWf1streatnco nveyance) is less than
0.7 or greater than 1.4. This may indicate the need for additional cross sections.
i~1 S e~:?lrn~n~t:a~h~r~:~;r f~~a~da; ~i~~afOc~o~l' s~~~7~~~. the current and previous cross seed on.
During the standard step iterations, when the assumed water surface was set e~ual to critical
depth, the calculated water surface Came back below critical depth. Thisindlcates that there is
not av.lid subcritical answer. The program defaulted to critical depth.
CROSS SECTION OUTPUT profilelllO-year

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Warning:

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warning:
warning:

warning:

warning:

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warning:

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~e~' H;~~v (~W
W.5. Elev (ft)
critW.S. (ft)
E.G. slope (ft/ft)
QTotal (cfs)
~;~.~~~~-(~~)s)
~~~v~h~O~~~h(~m
le"9thOltd. eft)
MinChEl(ft)
Alpha
Frctnloss(ft)
C,,"EloSS (ft)

7942.28 Element
0.99 wt. n-val.
7941.29 Reach Len. (ft)
7941.29 Flow Area (sq ft)
oi~g~~M :'i~: ~~1srt)
lA64....ll.'L....-To.p....Wi.dtl> (F..)
6.38 Avg.vel. (ft/s)
4.97 Hydr.Oepth(ft)
13998.8 conv. (cfs)
MII.66 wetteo l'eT. eft)
793t B ~~~:~ (~~~~~ m/ft s)
5.07 (umVolume(acre_ft)
0.22 cum SA (acres)

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left 08
0.060
894.82
45.41
48.70
74.37
Q~.~~
0.61
810.8
74.19
0.32
0.53
80.54
43.16

CS~~~~l Rig~66g8
849.72 700.27
137.69 18.06
137.69 6843.17
1154.98 54.65
'~lR&-.2~
8.39 3.03
3.16 1.60
12592.1 595.8
43.,5 n.74
1.66 0.81
13.93 2.44
81.98 116.18
25.42 50.02

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The energy equation could not be bahncedwithin the specified number of iterations. The
prOQramused critical depth for the water surhce and cOrltinued on with tile calculations.
oivlded flow computed for this cross-section.
The ...e",city r.e..d has changed by more than 0.5 ft. (0.15 m). This may indicate the need for
additional cross sections.
The energ'l' loss was greater than LOft (0.3m). betweentheCtlrrent arid previous cross sectian.
This maYlndicate the need for additional cross sections.
During the standard step iterations. when the assumed water surface was set e~ual to critical
depth, the calculated water surface came back below critical depth. This indlcates that there is
not a valid subcritical answer. The program defaulted to critical depth.

(ROSS SECTION O(}TPUT profileli'SO-year
~er' H~~:lv (~~F 7942.70 E'ement LeftOTl Channel Rig~66gTl
LOr. ", n-val. 0.060 0.035
101.5. Elev ~ft~ 7941.64 Reach Len. (ft) 894.82 849.72 700.27
CritW.S. ft 7941.64 Flow Area (sq ft) 72.27 152.79 22.19
E.G. slape (ft/ft) 0.008189 Area ~s~ ft) 79.26 152.79 7446.89
QTota1 (cfs) 1575.00 Flow c s) 148.72 1355.<8 71.00
~~~ ~~~~ ~~nS) 1882.20 TOP width (ft) ~4.99 43,55 1743.67
6.37 ~;~;. V~~;'t~fHg 2.06 8.87 3.20
Max ehl opth (ft~ s.n 0.88 3.51 1.77
Conv.TOtal (ds 17404.5 cony. (cfs) 164].4 14976.5 784.6
lenllthwtd. eft) lI49.57 \tIettedl'er. (ft) 82.15 43.55 B.OO
MinChEl(ft) 7938.13 ~~~:~m (~~~~~ m/ft s) 0.45 1.79 0.87
Alpha 1.69 0.93 15.91 2.79
FrctnlOsS ~m 4.53 cum Volume (acre-ft) 96.49 92.91 133.80
(,,"ElOSS 0.24 Cl.lmSA(acres) 47.07 25.42 55.11

warning:
warning:
warning:

warning:

Warning:

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warning:
warning:
Wa.rning:

The energy equation could not be balarlcedwithin the specified num bel' of iterations. The
program I.lsed critical depth for the water surhce and continued on with the calculations.
oivldedflow computed for this cross-section.
The velocity head has thanged by more than 0.5 ft (0.15 m). This may indicate the need for
page 10

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