B-13 
Bridge Hydraulics - USGS Hydrologic Atlas Sites 
8/3/94 
[FLAG.XLW]ANALYSIS.XLS 
FLAGON BAYOU, LOUISIANA    Q = 4730 cfs 
Computed Results From: 
HEC-2 
HEC-RAS 
WSPRO 
Channel 
Distance, 
ft 
Section 
Minimum 
Elevation, 
ft 
Observed 
WSEL, 
ft 
Depth, 
ft 
WSEL, 
ft 
Absolute 
Error, 
ft 
Relative 
Error 
Squared 
** 
WSEL, 
ft 
Absolute 
Error, 
ft 
Relative 
Error 
Squared 
** 
WSEL, 
ft 
Absolute 
Error, 
ft 
Relative 
Error 
Squared 
** 
5 EX1 
11826
59.5 
75.8 
16.3
75.8
0.0
75.8 
0.0
NA 
5 EX 
11938
59.5 
75.9 
16.4
NA
NA 
75.9 
0.0 
6.1 
12138
56.2 
76.1* 
19.9
75.9
-0.2
1.01E-04 
75.9 
-0.2
1.01E-04
76.2 
0.1 
2.53E-05
BR 
12140
56.2 
NA 
75.9
75.9 
NA 
BR 
12173
56.2 
NA 
76.0
76.0 
NA 
6.4 
12175
56.2 
76.2* 
20.0
76.0
-0.2
76.0 
-0.2
NA 
7 AP 
12375
66.2 
76.3 
10.1
76.2
-0.1
9.80E-05 
76.2 
-0.1
9.80E-05
76.9 
0.6 
3.53E-03
13983
67.3 
77.6 
10.3
77.0
-0.6
3.39E-03 
77.1 
-0.5
2.36E-03
77.4 
-0.2 
3.77E-04
17100
62.9 
79.7 
16.8
79.4
-0.3
79.6 
-0.1
79.6 
-0.1 
Sum of  Rel. Error Squared: 
0.0036 
0.0026
0.0039
Standard Error***: 
0.035 
0.029
0.036
EXPLANATION OF SYMBOLS: 
EX 
Denotes the section downstream of the bridge where effective flow width is assumed to have expanded to the full floodplain width.  In this study the distance to full expansion is assumed 
to be approximately equal to the transverse width of the bridge opening, unless otherwise noted. 
EX1 
Denotes a section approx.0.5 times the average bridge constriction width downstream from the bridge.  This is  considered the full expansion section for the HEC-2 and HEC-RAS runs 
at this site 
BR 
Denotes a section just inside the bridge. 
AP 
Denotes the section located upstream of the bridge a distance approximately equal to the transverse width of the bridge opening. 
NA 
Indicates that the value is not available from the data or the program output. 
Indicates that the observed water surface value is questionable either because there were very few values recorded on the atlas and/or because those that have been provided are not 
located within the active flow area 
** 
Relative Error Squared is equal to the square of the absolute error divided by the depth:   (Abs. Error / Depth )^2. 
*** 
Standard Error is equal to the square root of the Relative Error Squared divided by the number of RES values summed:  (Rel. Error Sq / n)^0.5 
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B-14 
Bridge Hydraulics - USGS Hydrologic Atlas Sites 
8/3/94 
[FLAG.XLW]CHART.XLC 
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EX 
Denotes the section downstream of the bridge where effective flow width is assumed to have expanded to the full floodplain width.  In this study the distance to full expansion is assumed 
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Observed
HEC-2
HEC-RAS
WSPRO
Bridge
Low Chord
Low Chord El  119.9 
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HEC-2 
HEC-RAS 
WSPRO 
Channel 
istance, 
ft 
Section 
Minimum 
Elevation, 
ft 
Observed 
WSEL, 
ft 
Depth, 
ft 
WSEL, 
ft 
Absolute 
Error, 
ft 
Relative 
Error 
Squared 
** 
WSEL, 
ft 
Absolute 
Error, 
ft 
Relative 
Error 
Squared 
** 
WSEL, 
ft 
Absolute 
Error, 
ft 
Relative 
Error 
Squared 
** 
3444
310.9 
320.6 
9.7
320.6
0.0
320.6 
0.0
320.6 
0.0 
3700
310.9 
320.8 
9.9
321.1
0.3
9.18E-04 
321.1 
0.3
9.18E-04
321.2 
0.4 
1.63E-03
3702
307.6 
NA 
321.1
321.1 
NA 
3730
307.6 
NA 
321.5
321.6 
NA 
3732
310.9 
321.6 
10.7
321.6
0.0
321.6 
0.0
NA 
3988
312.6 
322.0 
9.4
322.0
0.0
0.00E+00 
322.1 
0.1
1.13E-04
322.3 
0.3 
1.02E-03
4973
313.3 
323.1* 
9.8
322.8
-0.3
9.37E-04 
322.9 
-0.2
4.16E-04
323.1 
0.0 
0.00E+00
6220
315.4 
324.1* 
8.7
323.7
-0.4
323.8 
-0.3
324.0 
-0.1 
7380
319.5 
324.6* 
5.1
324.6
0.0
324.6 
0.0
324.8 
0.2 
Sum of  Rel. Error Squared: 
0.0019 
0.0014
0.0027
Standard Error***: 
0.025 
0.022
0.030
TION OF SYMBOLS: 
Denotes the section downstream of the bridge where effective flow width is assumed to have expanded to the full floodplain width.  In this study the distance to full expansion is assumed 
to be approximately equal to the transverse width of the bridge opening, unless otherwise noted. 
Denotes a section just inside the bridge. 
Denotes the section located upstream of the bridge a distance approximately equal to the transverse width of the bridge opening. 
Indicates that the value is not available from the data or the program output. 
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to be approximately equal to the transverse width of the bridge opening, unless otherwise noted. 
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