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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Warning:

erystalRiver,rep
~h~ ~~e~~;af~~s t~:~ ~~:~te~h~~a~ar.~ nn c(~~ 3 t~j. n~:~:~~ ~~~i ~~~~:~t c~~~s p~=~~~~~s cross section.
This may lndicate the need for additional cross sections.
Multiple critical depths were found at this location. The critical depth with the lowest, valid,
surface was used.

water

CROSS SECTrON OUTPiJT profile .Floodway
~~~. H~~~v (~~F 7793.73 Element LeftOB channel Ri8~~5gB
0.74 Wt. n-val. 0.050 O.OlS
w.~. Elev ~ft~ 7793.00 Reach Len. (ft) 453.78 527.62 576.04
crn \II.S. ft 7792.40 Flow Area (sq ft) 73.75 122.83 202.40
E.G. Slope (ft/ft) 0.005290 ~~~: (~~sft) 73.75 122.83 202.40
QTotlt.l(cfs) 2181.00 218.69 1086.61 875.71
~~~ ~~~~~ H~~s) 140.17 TOp \rI~dth ~ft) 44.29 25.31 70.57
5.47 AV~. vel. ft/s~ 2.97 8.85 4.B
Ma>.: Chl opth (ft~ 4.89 Hyr.oepth(ft 1.67 4.85 2.87
conv.Total (cfs 29986.3 Conv. (cfs) 3006.7 14939.6 12040.0
L~n9th wtd. (ft) 538.84 wetted per. (ft~ 45.90 25.H 71.47
MlnchEl (ft) 7788.11 shear (lb/sqft 0.53 1.60 0.94
Alpha 1.59 Stream Power (l/ft 5) 1.57 14.17 4.05
FrCtn Loss ~ft~ 2.62 Cum volume (acre-ft) 8.19 48.74 8.26
c & E LOsS ft 0.00 cum SA (acres) 3.15 10.63 3.18

Note:

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Warning: :::g~s e~:;or n~~~~t=a~h~r~:~~r f~~a~d~; ~i~~afO c~o~~' s~~~~~~. the current and previous cross section.
Note: Multiple critical depths .,ere found at this locatiOn. The critical depth with the lowest, valid, water
surface was used.

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CROSS SECTION OuTPUT
~~~. H;~~v (~g>
~r~t ~~~~ m~
E.G. Slope (ft/ft)
QTotal (cfs)
~~~ ~~~~~ ~rDs)
MaxchlOpth(ft)
Conv.Total (cfs)
Length Wtd. (ft)
MinehEl (ft)
Alpha
~rit~ t~~~ ~m

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warning:
warning:
Note:

Divided flaw computed for this cross-section.
The energ~ loss wa~ greater than 1.0 ft (0.3 m). betwe~n the current and previous cross section.
T~is may lndicate the need for additional cro~s section~.
Multiple critical depths were found at this locaticm. The critical depth wit:h t~e lowest. valid,
surface was u~ed.

water

ProfilellO-year

7793.00
0.91
7792.09
7791.96
0.007970
1657.00
16S-n
5.99
3.98
18560.1
5H.17
7788.11
1.63
3.01
0.15

Element
\lit. n~Val.
Reachlen. (ft)
Flow Area (sq ft)
~l~= ~~~~rt)
TOp width (ft)
Avg.Vel. (ft/s)
tlydr,Dept.l1(ft)
eonv. (cf~)
~~~i;d (~~/sq (~g
stream Power (lb/ft ~)
Cum volume (acre-ft)
Cum SA (acres)

left 08
0.050
453.78
H.08
54.20
113.78
62.83
L07
1.U
1274.4
32.68
0.56
1.73
14.84
10.76

Channel
0.035
527.62
99.90
99.90
945.26
25.31
9.46
3.'H
10587.9
25.33
1.96
18.57
38.54
10.63

Rig~~5gB
576.04
139.84
144.48
597.96
77.19
4.28
L07
6697.8
68.34
1.02
4.35
11.52
9.74

(ROSS SECTION ouTPUT Profi1el50-year
~e~' H;~dv (~g> 7793.43 Element leftoB Channel Rig~65~B
1.U \lit. 'I-Val. (1.050 0.035
~r~t ~~~~ ~m 7792.J1 Reachlen. (ft) 453.78 527.62 576.04
7792.J1 Flow Area (~q ft) 44.50 105.40 154.60
E.G. slope (ft/ft) 0.009357 ~l~= ~~~srt) 68.84 105.40 161.56
QTotal(cfs) 2031.00 150.90 1119.83 760.27
0~~ ~~~~~ I~US) 176.38 Top width (ft) 71.09 25.31 79.98
6.67 ~~~r. V~1Pt~fH~~ 3.39 10.62 4.92
~6~v~h~o~nh (~m 4.10 1.21 4.16 2.26
20996.8 Conv. (cfs) l5GO.O 11577.0 7859.7
leng,thwtd. (ft) wetted per. (ft~ 38.03 H.B 69.09
MinchEl (ft) 7788.11 Shear (Tb/sqft 0.68 2.43 1.ll
Alpha 1.62 Stream power (l 1ft ~) 2.ll 25.82 6.43
Frctn LOSS fft) cumvol[lflle(acre-ft) 19.26 43.36 16.80
<& , Loss '" Cum SA (acres) 12.45 10.63 11.77

The energy equation could not be balanced wi thin the ~pecified number of iterations. The
gi~{d:d H~~ ~~~~~~:~ ~~~t~hf~rc~~~s~:~~~-j~~~face and continued on with the calcu1ation~.
The velocity head has changed by mort than 0.5 ft (0.15 m). Thi~ may indicate the need for
additional cros~ ~ection~.
The conveyance ratio (upstream conveyance divided by downstream conveyance) is les~ than
0.7 or greater than 1. 4. This may indicate the need for additional cross ~ections.
The energ~ loss wa~ greater than 1,0 ft (0.3 m). between the current and previous cross section.
This may lnd,cate the need for addltianal cross s~ction~.
Multiple critical depths were found at this locatlon. The critical depth with the lowest, valio:l.
surface was used.

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warning;

warning:
warning:

warning;

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warning:
NOte:

CROSsSECTIONOUTPUT profi1e#500-year

The energy equation could not be balanced within the ~peci fied number of iterations. The
gi~{d:d ~~~~ ~~~~~~:~ ~~~t~hf~rc;~is':':'~~~~i~~~face and continued on with the calculations.
The velodty head has changed by more than 0.5 ft (0.15 m). This may indicate tht need for
additional cro~s ~ections.
The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than
0.7 or greater than 1.4. This may lndicate the neeCl for additional cross sections.
Theener<j'(loss was greater than 1.0 ft (0.3m). bet,,!een the curren t and previous cross section,
Thismaylndicatetheneedforadditionalcrosssectlons.
During tile standard step iterations, when the assumed >:<ater surface was set e<jual to critical
depth the ca1culat~d water surface came back below craical depth. Thi s indlCattS that there is
not a'valid subcritlcal answer. The program defaulted to critical depth.
~ultiple critical depths were found at this location. The critical depth with the lowest, valid, water
~urface ...as used.

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~~~. H;ldv (~g>
W.S.Elev(ft)
critw.s. (ft)
E.G. slope (ft/ft)
QToul(cfs)
~~~ ~~~~~ ~~~~s)
Maxchlopth(ft)
~~g~thT~~~~ ~~W
MinchEl (ft)
Alpha
FrctnlosS(ft)
C & E lOSS (ft)

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warning:
Warning:
warning:
Warning:

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warmog,
warning:

Note:

CROSS SECTION

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RIVER: crysul
REACH: Marble
INPiJT
Description:
sution Elevation Oata

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7793,95
1.20
7792,7S
7791,75
0.00g07~
2.\15.00
194,18
6.90
4.64
26401.6
527.18
7788.11
1.62
2.14
0.30

RS:9S36

nu.... 223

Element
Wt. 'I-val.
Reach Len. (ft)
Flow Area (sqft)
:~~~ ~~~srt)
Top Width (ft)
~~~r. V~lpt~fHg
conv. (cfs)
~~~~~d (~b/sq (m
Stream power (lb/ft s)
Curnvolume(acre-ft)
Cum SA (acres)

leftOB
0.050
453.78
62.84
102.98
215.74
83.21
3.43
1.37
2264.7
47.05
0.76
2.60
2S.'19
16.44

Channel
0.035
527.62
116.55
116.55
1303.98
25.n
11.19
4.60
13688.7
25.33
2.61
29.16
49.12
10.63

water

Ri8~~5gB
576.04
185.00
198.04
995.29
85.66
5.38
2.65
10448.2
70.61
1.48
7.99
B.S8
13.S1

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