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

I

I

TOp Width (ft)
vel Total (ft/s)
MaxChlopth(ft)
conv. Total (cfs)
Lengthwtd. (ft)
MinchEl (ft)
Alpha
frctnLoss(ft)
C & E LOSS (ft)

98.H
6.93
1.89
159S3.2
349.67
7944.33
1.42
1.37
0.12

TOp width (ft)
Avg.Vel. (ft/s)
Hydr. Depth (ft)
conv. (cfs)
Wetted Per. (ft!
shear{lb/sqft
stream power (1/fts)
cum volume (acre-ft)
Cum SA (acres)

~6:na 1 Rive~2 ~3~
9.99 4.84
3.79 2.00
9347.9 660S.3
30.00 75.94
2.32 1.34
23.16 6.47
110.87 B.28
26.16 8.S5

I

30.45
12.20

I

warning:
warning:
warning:
Warning:

The energy equation could not be balanced within the specified number of iterations. The
progril1ll used critical depth for the water surface and continued on with the calculations.
The conveyance ratio (upstream conveyance divided by dOWnstreillllCO nveyance) is less than
~ti~ ~~e~~;af~~s t;:i ;~:ate~hi~a~ar. ~ n~ic(~~ 3 t~). n~:~W:~~ ~~~i ~~~~:~t c~~~s p~:~{~~~s cross section.
This may Hldicate the need for additional cross sections.
~~~i~: ~~: ~~t~~t~~e~t:~t~~e~~~~~~~, c::\;~~ ~~~:e~r~~{~~l s~~:~~~ w~~i ~e{ n~?~:~e~o t~~i ti~;~e is
not a valid subcritical answer. The program defaulted to critical depth.
The {larabolic search method failed to converge on critical depth. The program will try the cross
sectlonslice/secant method to find critical depth.

warning:

I

I

CROSS SECTION OUTPUT profilellO-year
~~~. H:~~v (~W 7948.41 Element LeftOB Channel Rig~~sgB
1.33 wt. n-val. 0.060 0.035
w. S. Elev ~ft? 7947.09 Reach Len. (ft) 121.71 345.98 36S.58
crit W.S. ft 7947.09 Flow Area (sq ft) 19.19 69.S! 81.66
E.li. s.'o~ (ft/ft) l:UHS77<l ~~~: ~~~sr) 19.19 69.,1 H."o
QTonl (cfs) 1284.00 82.25 775.34 426.40
~~~ ~~~;~ m~s) 95.54 TOp width ~ft) 13.24 26.17 56.13
7.54 AV~. vel. ft/S~ 4.29 11.15 5.22
Mall chl Dpth (ft~ 2.75 Hyr. Depth (ft 1.45 2.66 1.45
Conv. Total ~cfS 9372.0 conv.(cfs) 600.4 S659.3 3112.4
Length wtd. ft) 348.15 wetted Per. (ft~ 13.52 26.18 56.89
MinchEl (ft) 7944.H shear(lb/sqft 1.66 3.11 1.68
Alpha 1.50 Stream power (l/fts) 7.13 34.71 8.78
Frctn Loss ~ft~ 1.45 Cum volume (acre-ft) 81.05 85.35 153.94
C&.ELoss ft 0.25 cum SA (acres) 43.71 26.16 59.78

I

warning:

The energy equation could not be balanced within the specified num bel' of iterations. The
pro~ram used critical depth for the water surface and continued on with the calculations.
oivlded flow computed for this cross-section.
The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need for
additional cross sections.
The conveyance ratio (upstream conveYllnce divided by downstream conveyance) is less than
~ti~ ~~e~~;af~~s t~:~ ~;.:ate~hi~a~al.~n~i c(~~ 3 t~). n~:~:~~ ~~~i~~~~:~t c~~~s p~:~{~~is cross secti on.
This may lndicate the need for additional cross sections.
During the standard step iterations, when the usumed water surface was set equal to critical
depth, the calculated water surface Came back below critical depth. This indlcatu that there is
not a valid subcritical anSwer. The program defaulted to critical depth.

I

warning:
warning:
warning:
warning:
warning:

I

CROSS SECTION OUTPUT Profile,f50-year
~~~'H~~~v(}~F 7948.79 Element Leftou chann~l Ri8~~5~B
0.92 "" n~val. 0.060 O.OlS
W.~. Elev ~ft~ 7947.87 Reach Lell. (ft) 321.73 345.98 365.58
cra 01.5. ft 7947.87 Flow Area (sq ft) 47.99 90.0S 139.93
E.G. Slope (ft/ft) 0.010051 ~1~: ~~~srt) 48.97 90.0S 139.93
QTotal (ds) 1575.00 105.30 873.39 596.31
~~~ ~~~~ m~S) 173.05 TOp width ~ft) 61.50 26.17 85.38
5.67 AV~. vel. ft/S~ 2.19 9.70 4.26
Max Chl opth (ft~ 3.54 Hyr.Depth(ft 0.83 3.44 1.64
conv. Tota T ~cfs 1571D.2 Cony. (cfs) 1050.4 8711.9 5948.0
Lellgthwtcl. ft) 348.54 Wetted Per. (ft~ 57.77 26.18 86.40
MinchEl (ft) 7944.33 Shear(lb/sqft 0.52 2.16 1.02
Alpha 1.85 stream Power (1/fts) 1.14 20.94 4.33
FrctnLoss ml 1.36 Cum Volume (acre-ft) 97.30 96.62 175.12
C&ELOSS 0.09 cum SA (acres) 47.89 26.16 65.02

I

I

warning:
warning:
warning:
warning:
warning:

Th~ ~nergy equation could not b~ balanced withi" th~ specified number of iterations. The
g~~~~:~ ~~~ ~~~~~~:1 ~~~t~hf~rc~~;s~:~~~i~~~hce and continued on with the calculations.
The conveyance ratio (upstream conveyance divicledby downstreillllco nveyance) is leS5 than
0.7 01' great~r than 1.4. This may indicate the ne~d for additional cross sections.
:::~~ s e~:~gr n1~~:t;a~h~r~:~~r f~~a~d~;~i~~afO c~o~~' s~~ii'~~~. the current and preYi ous cross section.
During the standard step iterations, when th~ assumed water surface was set equal to critical
depth, the calculated water surface came back below critical depth. This indlCateS that there is
not a valid subcritical answer. The progralldefaulted to critical depth.

I

CROSS SECTION OUTPUT Profilel/SOO-year
~ef' H;~~v (~g) 7949.17 Element LeftOB Channel Ri8~55~B
0.91 "" n-val. 0.060 0.035
w.~. El~v ~ft~ 7948.26 Reach Len. (ft) 321.73 345.98 365.58
cra w.s. ft 7948.26 Flow Area (sq ft) 71.19 100.29 174.01
E.G. Slope (ft/ft) 0.009132 ~1~: f~1s~t) 74.36 100.29 174.01
QTotal (cfs) 19S0.00 186.01 996.3] 767.66
~~~ ~~~~~ HUs) 182.34 Top w1dth ~ft) 68.17 26.17 88.00
5.64 A,y~. lIel. ft/s~ 2.61 9.93 4.41
Max ch 1 Dpth (ft~ 3.93 Hyr.Oepth(ft 1.17 3.83 1.98
Conv.Total (ds 20406.1 COny. (cfs) 1946.5 10426.3 80H.3
Length wtd. (ft) 348.28 wetted Per. (ft~ 61.37 26.18 89.07
MinchEl (ft) 7944.33 shear (lb/sqft 0.66 2.18 1.11
Alpha 1.84 Streillll power (l/fts) 1.73 21.70 4.91
FrctnLoss ~m 1.41 cum volume (acre-ft) 119.29 109.15 201.90
C &. E LOSS 0.04 cum SA (acres) 52.74 26.15 71.15

I

I

warning:
warning:
warning:
warning:
warning:

The energy equation could not be balanced within the specified number of iterations. The
proQram used critical depth for the water surface and continued on with the calculations.
Di III ded flow computed for this cross-senion.
The conveyance ratio (upstream conveyance divideclby downstreillllc onveyance) is less than
0.7 or greater than 1.4. ThismayindicatetheneedforadditionaTcrOS5sections.
The energr l,?sswas greater than 1:0.ft (0.3m). be~enthecurrentandprevious cross section.
Thismaylndlcatetheneedforaddltlonalcrosssect10nS.
During the standard step iterations, when the assumed \;Ia~er surface was .se~ e<:jual to critical
depth, the calculated water surface came back below cl'ltlcal depth. Th1S ,ndlcates that there is
not a valid subcritical answer. The program defaulted to critical depth.

I

CROSS SECTION

RIVER; Crystal
REACH; Marble

R~: 23230

I

INPUT
Description:
StationEleyationData nlJlnoo
Sta Eley Sta Elev
07968.74 4.747968.51
21.757967.17 34.677966.31
63.67964.37 64.467964.31
91.97962.27107.897961.01

155
Sta Elev
7.347968.33
35.927966.22
75.017963.6
117.47960.31

sn Elev
14.977967.78
46.287965.53
76.767963.47
123.247959.85

Sta Elev
20.n 7967.31
48.447965.38
89.577962.45
131.147959.27

I

page 4

I