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HomeMy WebLinkAbout14011 Backwater Analysis - Rational MethodBACKWATER ANALYSIS
Conveyance System Information
Pipe Segment
CB/MH #
Down
CB #00
CB #01
CB #02
CB #03
CB #04
CB #05
CB #06
CB #07
CB #08
Project Name:Renton Shortplat
Job Number: 14011
CB/MH #
Up
CB #01
CB #02
CB #03
CB #04
CB #05
CB #06
CB #07
CB #08
CB #09
Surface
Flow
Q
CFS
0.590299064278632
0.281259529364127
0.817545943803696
0.767257835566723
1.02930335195803
0
0
0.144328252617228
2.46082547943417E-02
Total
Flow
Qtot
CFS
3.65460223238277
3.06430316810414
2.78304363874001
1.96549769493632
1.1982398593696
0.16893650741157
0.16893650741157
0.16893650741157
2.46082547943417E-02
Length
L
FT
66
62
100
130
155
15
144
45
174
Pipe
Size
D
IN
12
12
12
12
12
12
12
12
12
"n"
value
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
Designed By:
Storm Event:
Down-
Stream
Invert
FT
467.06
467.39
467.7
468.2
468.85
469.63
473.73
477.3
477.75
Henry Stefan Checked By: Peter Apostol
25-YEAR Rational Method
Down-
Stream
Rim
FT
472.14
472.59
472.7
473.2
473.85
476.6
479.15
479.81
480.61
Up-
Stream
Invert
FT
467.39
467.7
468.2
468.85
469.63
469.93
475.17
477.75
480.4
Up-
Stream
Rim
FT
472.59
472.7
473.2
473.85
476.6
479.15
479.81
480.61
482.81
Pipe
Slope
%
4.99999999999976E-03
5.00000000000004E-03
0.005
5.00000000000026E-03
5.03225806451595E-03
2.00000000000008E-02
9.99999999999998E-03
9.99999999999975E-03
1.52298850574711E-02
Barrel
Velocity
FPS
4.65318408254715
3.90159197068743
3.54348121556743
2.50254939027873
1.52564637302727
0.215096641785856
0.215096641785856
0.215096641785856
3.13322031310746E-02
Barrel
Velocity
Head
FT
0.336213076181214
0.236372979902681
0.194972967780733
9.72477243910628E-02
3.61428083157028E-02
7.18424927135914E-04
7.18424927135914E-04
7.18424927135914E-04
1.52438967864428E-05
Critical
Depth
Ratio
0.66
0.6
0.58
0.06
0.06
0.06
0.06
0.06
0.06
Critical
Depth
FT
0.66
0.6
0.58
0.47
0.36
0.15
0.15
0.13
0.06
TW
Elev.
FT
468.06
469.395118800369
469.94810667627
470.664312789278
471.111275034557
471.373924293575
471.375014733641
476.170804635918
478.751213262729
481.400026067063
TW
Check
FT
468.06
469.395118800369
469.94810667627
470.664312789278
471.111275034557
471.373924293575
474.305
477.865
478.751213262729
Barrel
Hyd.
Rad.
FT
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
Outlet Control
Friction
Loss
FT
0.588510763222507
0.388673914229551
0.517094926372296
0.335288512521123
0.148576275354065
2.85804146874722E-04
2.74371980999733E-03
8.57412440624166E-04
7.03462776941592E-05
Entrance
HGL
Elev.
FT
468.648510763223
469.783792714598
470.465201602642
470.999601301799
471.259851309912
471.374210097722
476.17
478.75
481.4
Entrance
Ke
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Entrance
Head
Loss
FT
0.168106538090607
0.11818648995134
9.74864838903665E-02
4.86238621955314E-02
1.80714041578514E-02
3.59212463567957E-04
3.59212463567957E-04
3.59212463567957E-04
7.62194839322141E-06
Exit
Head
Loss
FT
0.336213076181214
0.236372979902681
0.194972967780733
9.72477243910628E-02
3.61428083157028E-02
7.18424927135914E-04
7.18424927135914E-04
7.18424927135914E-04
1.52438967864428E-05
Outlet
Control
Elev.
FT
469.152830377494
470.138352184452
470.757661054313
471.145472888385
471.314065522385
471.375287735113
476.171077637391
478.751077637391
481.400022865845
Inlet Control
Inlet
Control
HW/D
FT
1
0.925
0.85
0.675
0.55
0.1
0.1
0.1
0.1
Inlet
Control
Elev.
FT
468.39
468.625
469.05
469.525
470.18
470.03
475.27
477.85
480.5
Headwater Summation
Control
HW
Elev.
FT
469.152830377494
470.138352184452
470.757661054313
471.145472888385
471.314065522385
471.375287735113
476.171077637391
478.751077637391
481.400022865845
Approach
Veloctiy
Head
FT
0.236372979902681
0.194972967780733
9.72477243910628E-02
3.61428083157028E-02
7.18424927135914E-04
7.18424927135914E-04
7.18424927135914E-04
1.52438967864428E-05
Bend
Kb
1.33
0.02
0.02
0.02
0.62
0.62
0.62
0.21
0.21
Bend
Head
Loss
FT
0.447163391321014
4.72745959805362E-03
3.89945935561466E-03
1.94495448782126E-03
2.24085411557358E-02
4.45423454824266E-04
4.45423454824266E-04
1.50869234698542E-04
3.20121832515299E-06
Q1
CFS
3.06430316810414
2.78304363874001
1.96549769493632
1.1982398593696
0.16893650741157
0.16893650741157
0.16893650741157
2.46082547943417E-02
0
Q3
CFS
0.36
0.629
V1
FPS
4.65318408254715
3.90159197068743
3.54348121556743
2.50254939027873
1.52564637302727
0.215096641785856
0.215096641785856
0.215096641785856
3.13322031310746E-02
Junction
Head
Loss
FT
3.14980114561475E-02
3.81686549616135E-02
Head
Loss
Total
FT
0.478661402777162
4.72745959805362E-03
3.89945935561466E-03
1.94495448782126E-03
6.05771961173493E-02
4.45423454824266E-04
4.45423454824266E-04
1.50869234698542E-04
3.20121832515299E-06
HW
Elev.
FT
469.395118800369
469.94810667627
470.664312789278
471.111275034557
471.373924293575
471.375014733641
476.170804635918
478.751213262729
481.400026067063
Overtopping Check
(HW - Rim)
Clearance
FT
-3.19488119963114
-2.75189332373031
-2.53568721072236
-2.73872496544254
-5.22607570642469
-7.77498526635935
-3.63919536408156
-1.85878673727137
-1.40997393293657
Over-
topping
Check
Okay
Okay
Okay
Okay
Okay
Okay
Okay
Okay
Okay
BACKWATER ANALYSIS
Conveyance System Information
Pipe Segment
CB/MH #
Down
CB #00
CB #01
CB #02
CB #03
CB #04
CB #05
CB #06
CB #07
CB #08
Project Name:Renton Shortplat
Job Number: 14011
CB/MH #
Up
CB #01
CB #02
CB #03
CB #04
CB #05
CB #06
CB #07
CB #08
CB #09
Surface
Flow
Q
CFS
0.69623735762045
0.331735900292091
0.964267203002927
0.904954116268785
1.21402775190384
0
0
0.170230188921262
2.90245865705389E-02
Total
Flow
Qtot
CFS
4.31047710457989
3.61423974695944
3.28250384666735
2.31823664366442
1.41328252739564
0.199254775491801
0.199254775491801
0.199254775491801
2.90245865705389E-02
Length
L
FT
66
62
100
130
155
15
144
45
174
Pipe
Size
D
IN
12
12
12
12
12
12
12
12
12
"n"
value
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
0.012
Designed By:
Storm Event:
Down-
Stream
Invert
FT
467.06
467.39
467.7
468.2
468.85
469.63
473.73
477.3
477.75
Henry Stefan Checked By: Peter Apostol
100-YEAR Rational Method
Down-
Stream
Rim
FT
472.14
472.59
472.7
473.2
473.85
476.6
479.15
479.81
480.61
Up-
Stream
Invert
FT
467.39
467.7
468.2
468.85
469.63
469.93
475.17
477.75
480.4
Up-
Stream
Rim
FT
472.59
472.7
473.2
473.85
476.6
479.15
479.81
480.61
482.81
Pipe
Slope
%
4.99999999999976E-03
5.00000000000004E-03
0.005
5.00000000000026E-03
5.03225806451595E-03
2.00000000000008E-02
9.99999999999998E-03
9.99999999999975E-03
1.52298850574711E-02
Barrel
Velocity
FPS
5.48826990622664
4.60179296998237
4.17941370332216
2.95167056876766
1.79944720176338
0.253699059633488
0.253699059633488
0.253699059633488
3.69552513911992E-02
Barrel
Velocity
Head
FT
0.467719046018525
0.328827617058682
0.271234455023556
0.13528507991505
5.02796619865539E-02
9.99428771101179E-04
9.99428771101179E-04
9.99428771101179E-04
2.12063758600424E-05
Critical
Depth
Ratio
0.66
0.6
0.58
0.06
0.06
0.06
0.06
0.06
0.06
Critical
Depth
FT
0.66
0.6
0.58
0.47
0.36
0.15
0.15
0.13
0.06
TW
Elev.
FT
468.06
469.911004899922
470.680287774681
471.67662986742
472.298416376568
472.660789336537
472.662306289991
476.171119360224
478.751687816823
481.400036262903
TW
Check
FT
468.06
469.911004899922
470.680287774681
471.67662986742
472.298416376568
472.660789336537
474.305
477.865
478.751687816823
Barrel
Hyd.
Rad.
FT
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
Outlet Control
Friction
Loss
FT
0.818700140614712
0.540699351853137
0.719350801018557
0.466432849663545
0.206690217283915
3.97593229991846E-04
3.81689500792172E-03
1.19277968997554E-03
9.78614343849391E-05
Entrance
HGL
Elev.
FT
468.878700140615
470.451704251775
471.399638575699
472.143062717083
472.505106593852
472.661186929767
476.17
478.75
481.4
Entrance
Ke
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Entrance
Head
Loss
FT
0.233859523009262
0.164413808529341
0.135617227511778
0.067642539957525
2.51398309932769E-02
4.99714385550589E-04
4.99714385550589E-04
4.99714385550589E-04
1.06031879300212E-05
Exit
Head
Loss
FT
0.467719046018525
0.328827617058682
0.271234455023556
0.13528507991505
5.02796619865539E-02
9.99428771101179E-04
9.99428771101179E-04
9.99428771101179E-04
2.12063758600424E-05
Outlet
Control
Elev.
FT
469.580278709643
470.944945677363
471.806490258234
472.345990336956
472.580526086831
472.662686072924
476.171499143157
478.751499143157
481.400031809564
Inlet Control
Inlet
Control
HW/D
FT
1
0.925
0.85
0.675
0.55
0.1
0.1
0.1
0.1
Inlet
Control
Elev.
FT
468.39
468.625
469.05
469.525
470.18
470.03
475.27
477.85
480.5
Headwater Summation
Control
HW
Elev.
FT
469.580278709643
470.944945677363
471.806490258234
472.345990336956
472.580526086831
472.662686072924
476.171499143157
478.751499143157
481.400031809564
Approach
Veloctiy
Head
FT
0.328827617058682
0.271234455023556
0.13528507991505
5.02796619865539E-02
9.99428771101179E-04
9.99428771101179E-04
9.99428771101179E-04
2.12063758600424E-05
Bend
Kb
1.33
0.02
0.02
0.02
0.62
0.62
0.62
0.21
0.21
Bend
Head
Loss
FT
0.622066331204638
6.57655234117365E-03
5.42468910047113E-03
0.002705701598301
3.11733904316634E-02
6.19645838082731E-04
6.19645838082731E-04
2.09880041931248E-04
4.45333893060891E-06
Q1
CFS
3.61423974695944
3.28250384666735
2.31823664366442
1.41328252739564
0.199254775491801
0.199254775491801
0.199254775491801
2.90245865705389E-02
0
Q3
CFS
0.36
0.629
V1
FPS
5.48826990622664
4.60179296998237
4.17941370332216
2.95167056876766
1.79944720176338
0.253699059633488
0.253699059633488
0.253699059633488
3.69552513911992E-02
Junction
Head
Loss
FT
3.74874761332377E-02
5.00892880451402E-02
Head
Loss
Total
FT
0.659553807337876
6.57655234117365E-03
5.42468910047113E-03
0.002705701598301
8.12626784768036E-02
6.19645838082731E-04
6.19645838082731E-04
2.09880041931248E-04
4.45333893060891E-06
HW
Elev.
FT
469.911004899922
470.680287774681
471.67662986742
472.298416376568
472.660789336537
472.662306289991
476.171119360224
478.751687816823
481.400036262903
Overtopping Check
(HW - Rim)
Clearance
FT
-2.67899510007823
-2.01971222531944
-1.52337013258011
-1.55158362343229
-3.93921066346286
-6.48769371000918
-3.63888063977635
-1.85831218317725
-1.40996373709731
Over-
topping
Check
Okay
Okay
Okay
Okay
Okay
Okay
Okay
Okay
Okay
CONVEYANCE INPUTS AND LAYOUT DATA
Project Name:
Job Number:
Designed By:
CB
Downstream
CB #00
CB #01
CB #02
CB #03
CB #04
CB #05
CB #06
CB #07
CB #08
Limelite Short Plat
14011
MEB
CB
Upstream
CB #01
CB #02
CB #03
CB #04
CB #05
CB #06
CB #07
CB #08
CB #09
Impervious
Area
sf
11707
5449
10769
11745
20117
0
0
2952
469
Event Parameters:
Event
25-yr, 24-hr
100-yr, 24-hr
Pervious
Area
sf
9966
5213
33404
25451
18445
0
0
2114
484
PR
in
3.4
3.9
Total
Area
sf
21673
10662
44173
37196
38562
0
0
5066
953
aR
unitless
2.66
2.61
Total
Area
ac
0.497543617998163
0.244765840220386
1.014072543618
0.853902662993572
0.885261707988981
0
0
0.116299357208448
2.18778696051423E-02
bR
unitless
0.65
0.63
C
unitless
0.601107368615328
0.582193772275371
0.408464446607656
0.455243843424024
0.589091592759712
0
0
0.628760363205685
0.569884575026233
Tc
min
10.4
10.4
IR, 25-yr
in/hr
1.973735184757
1.973735184757
1.973735184757
1.973735184757
1.973735184757
1.973735184757
1.973735184757
1.973735184757
1.973735184757
iR
unitless
0.580510348457941
0.59691089189443
Q25-yr
Surface
cfs
0.590299064278632
0.281259529364127
0.817545943803696
0.767257835566723
1.02930335195803
0
0
0.144328252617228
2.46082547943417E-02
IR
in/hr
1.973735184757
2.32795247838828
Q25-yr
Total
cfs
3.65460223238277
3.06430316810414
2.78304363874001
1.96549769493632
1.1982398593696
0.16893650741157
0.16893650741157
0.16893650741157
2.46082547943417E-02
IR,100-yr
in/hr
2.32795247838828
2.32795247838828
2.32795247838828
2.32795247838828
2.32795247838828
2.32795247838828
2.32795247838828
2.32795247838828
2.32795247838828
Runoff Coefficients:
C impervious
C pervious
Q100-yr
Surface
cfs
0.69623735762045
0.331735900292091
0.964267203002927
0.904954116268785
1.21402775190384
0
0
0.170230188921262
2.90245865705389E-02
0.9
0.25
Q100-yr
Total
cfs
4.31047710457989
3.61423974695944
3.28250384666735
2.31823664366442
1.41328252739564
0.199254775491801
0.199254775491801
0.199254775491801
2.90245865705389E-02
PGIS to StormFilter
0.046
0.031
0.069
0.058
0.11
0.283
0.377
0.055
0.166
0.087
0.104
0.105
1.491
Manning's n Coefficients for Open Channel Flow
Material
Natural Streams
Clean and Straight
Major Rivers
Sluggish with Deep Pools
Metals
Brass
Cast Iron
Smooth Steel
Corrugated Metal
Non-Metals
Glass
Clay Tile
Brickwork
Asphalt
Masonry
Corrugated Polyethylene (PE) with smooth inner walls a,b
Corrugated Polyethylene (PE) with corrugated inner walls c
Polyvinyl Chloride (PVC) with smooth inner walls d,e
Manning n
0.03
0.035
0.04
0.011
0.013
0.012
0.022
0.01
0.014
0.015
0.016
0.025
Material
Excavated Earth Channels
Clean
Gravelly
Weedy
Stony, Cobbles
Floodplains
Pasture, Farmland
Light Brush
Heavy Brush
Trees
Finished Concrete
Unfinished Concrete
Gravel
Earth
Planed Wood
Unplaned Wood
Manning n
0.022
0.025
0.03
0.035
0.035
0.05
0.075
0.15
0.012
0.014
0.029
0.025
0.012
0.013
0.009-0.015
0.018-0.025
0.009-0.011
Known variables
Q
D
radius
g (constant)
Solver
critical depth
phi
T
A
(Q^2*T)/(g*A^3)
dc/D
(cfs)
(in)
(ft)
(ft^2/s)
(ft)
(rad)
(ft)
(ft^2)
0.02
12
0.5
32.2
5.72205165902216E-02
0.966200778431574
0.464526981224427
1.79335889157189E-02
1.00049156788984
5.72205165902216E-02
Culvert Entrance Loss Coefficients
Design of Entrance
Pipe Culverts
Pipe projecting from fill,
square cut end
socket end
Headwall with or without wingwalls,
square end
socket end
Pipe mitred to conform to fill slope,
precast end
field cut end
Box Culverts
No wing walls, headwall parallel to embankment,
square edge on three edges
three edges rounded to 1/12 barrel dimensions
Wing walls at 30o to 75o to barrel,
square edge at crown
crown rounded to 1/12 culvert height
Wing walls at 10o to 30o to barrel,
square edge at crown
Wing walls parallel (extension of sides),
square edge at crown
ke
0.5
0.2
0.5
0.2
0.5
0.7
0.5
0.2
0.4
0.2
0.5
0.7
Note: To draw lines on the nomograph go to the "Tools" tab, click on "Customize",
then click on the "Toolbars" tab, and then click on the "Drawing" toolbar box. This
will add the drawing toolbar. Use the line box on the drawing toolbar to then draw
lines to determine your value.
Note: To draw lines on the nomograph go to the "Tools" tab, click on "Customize",
then click on the "Toolbars" tab, and then click on the "Drawing" toolbar box. This
will add the drawing toolbar. Use the line box on the drawing toolbar to then draw
lines to determine your value.
Note: To draw lines on the nomograph go to the "Tools" tab, click on "Customize",
then click on the "Toolbars" tab, and then click on the "Drawing" toolbar box. This
will add the drawing toolbar. Use the line box on the drawing toolbar to then draw
lines to determine your value.
Note: To draw lines on the nomograph go to the "Tools" tab, click on "Customize",
then click on the "Toolbars" tab, and then click on the "Drawing" toolbar box. This
will add the drawing toolbar. Use the line box on the drawing toolbar to then draw
lines to determine your value.