SW6220601_Design Calculations_20220629

STORMWATER MANANGEMENT SWALES
CALCULATIONS FOR
MAGNOLIA RIDGE SUBDIVISION
HARNETT COUNTY
PREPARED BY:
Ken Bright Associates, PLLC
P.O. Box 553
Sanford, NC 27331
[phone]
[e-mail]
April 27, 2022

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE-I-MICRO TOWERD-EAST.xlsx
Area (Ac) C
C X A
INPUT:
SWALE #
TO STA 480 BLOSSOM right Woods 0.00 0.05
0.00
description:
Road EX A 0.00 0.95
0.00
use:
Road prop z 0.14 0.95
0.13
SKIP
known area =
ac. Lawn 0.15 0.3
0.05
SKIP
known C =
Build allow 0.00 0.95
0.00
Residential 0.5
0.00
USE
area =
0.3 acres Commercial 0.6
0.00
USE
C-aver =
0.61 Total
0.18
USE
ITotal Area I 0.3 Caver = I0.61
USE
IMPERVIOUS AREA = 0.15 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.14 Ac
Use C=0.3
C =
0.61 from table 8.03a runoff coefficient or from weighted c from above
7.82
S
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
4
I TREATMENT =
0.75 in/hr length = ft
.3
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/bfds map cont.hti
type channel: TRI
z
width =
0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD
y
channel slope =
6.5 % C-COEFF = 0.61
side slope =
4 ft per ft L= 0
C
SLOPE 5
w .ps
OUTPUT:
.06
010 =
1.40 cfs tc = 0 MIN
USE Tc = 5 min
-04
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 1.40 curve Vel calculate
computed
D 0.00 0.5 1.64 0.090 0.40 HR okay Depth OK
C 0.00 0.65 1 1.57 1 1 0.1901 0.29 HR okay Depth OK
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = i an rfc cinr nar n-f rnnrlifinn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10 y 7.85
in/hr
6^ so to- c
s^ rn s^ b
Less than 2^ E
oz
l z a s s 1.0 a a s e ,o
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
1.64 1.00 0.24 4.12 4 8
171
condition
depth ft.
Q10 cfs
1.40
n
comments
velocity
area
ft
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.2
0.64
0.02
check
liner req'd
4.01
0.16
0.10
1.65
1.6
Coconut fiber
0.3
1.72
0.022
okay
4.78
0.36
0.15
2.47
2.4
shear stress = 1.22 lb per sq. tt., formula I = yds, page b.U5.12
comments: Excelsior Mat T = 1.55
Coconut fiber Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:16 AM
20

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE-2-MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 2
TO STA 480 BLOSSOM LEFT Woods 0.00 0.05
0.00
description:
Road EX A 0.00 0.95
0.00
use:
Road prop z 0.09 0.95
0.09
SKIP
known area =
ac. Lawn 0.14 0.3
0.04
SKIP
known C =
Build allow 0.00 0.95
0.00
Residential 0.5
0.00
USE
area =
0.23 acres Commercial 0.6
0.00
USE
C-aver =
0.55 Total
0.13
USE
ITotal Area I 0.23 Caver = I0.55
USE
IMPERVIOUS AREA 0.14 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.09 Ac
Use C=0.3
C =
0.55 from table 8.03a runoff coefficient or from weighted c from above
7.82
S
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
4
I TREATMENT =
0.75 in/hr length = ft
.3
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/bfds map cont.hti
type channel: TRI
z
width =
0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD
y
channel slope =
6.5 % C-COEFF = 0.55
side slope =
4 ft per ft L= 0
C
SLOPE 5
w .0s
OUTPUT:
.06
010 =
1.00 cfs tc = 0 MIN
USE Tc = 5 min
-04
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 1.00 curve Vel calculate
computed
D 0.00 0.45 1.01 0.110 0.27 HR okay Depth OK
C 0.00 0.6 1 1.14 1 1 0.2101 0.23 HR okay Depth OK
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = i nn rfc cinr nar n-f rnnrlifinn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10 y 7.85
in/hr
6^ ro to- c
s^ m s^ b
Less than 2^ E
oz
i z a s s 1.0 a a s e ,o
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
1.25 0.81 0.22 3.71 3.6 7.6
171
condition
depth ft.
Q10 cfs
1.00
n
comments
velocity
area
ft
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.2
0.64
0.02
check
liner req'd
4.01
0.16
0.10
1.65
1.6
Excelsior
0.3
1.15
0.033
okay
3.18
0.36
0.15
2.47
2.4
shear stress = 1.22 lb per sq. tt., formula I = yds, page b.U5.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:19 AM
20

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE-3-MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 3
STA 480-680 BLOSSOM right Woods 0.00 0.05
0.00
description:
Road EX A 0.00 0.95
0.00
use:
Road prop z 0.05 0.95
0.05
SKIP
known area =
ac. Lawn 0.07 0.3
0.02
SKIP
known C =
Build allow 0.00 0.95
0.00
Residential 0.5
0.00
USE
area =
0.12 acres Commercial 0.6
0.00
USE
C-aver =
0.57 Total
0.07
USE
ITotal Area I 0.12 Caver=
0.57
USE
IMPERVIOUS AREA 0.07 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.05 Ac
Use C=0.3
C =
0.57 from table 8.03a runoff coefficient or from weighted c from above
7.82
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr length = ft
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width =
0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
1.13 % C-COEFF = 0.57
i
side slope =
4 ft per ft L= 0
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
0.54 cfs tc = 0 MIN
USE Tc = 5 min
oa
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 0.54 curve Vel calculate
computed
D 0.00 0.6 1 0.59 0.170 0.12 checkHR Depth OK
C 0.00 Ina #DIV/0! 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = n 9d rfc cinr nor n-f rnnrlifinn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10y7.85
in/hr
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VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
0.41 1.44 0.29 1 4.95 4.8 8.8 jokay
#DIV/0! 0.00 #DIV/0! 1 0.00 0 4 ####
Ira
condition
depth ft.
Q10 cfs
0.54
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.2
0.27
0.02
check
no liner req'd
1.67
0.16
0.10
1.65
1.6
Excelsior
0.35
0.72
0.033
okay
1.47
0.49
0.17
2.89
2.8
shear stress = U.2b lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:20 AM

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
PRECIPITATION
FILE:
sWALE-4-MICRO TOWER .xlsx
INTENSITY(IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
INPUT:
SWALE # 4
STA 480-680 BLOSSOM LEFT
Woods
0.00
0.05
0.00
10-min: 6.28
6.94
description:
Road EX A
0.00
0.95
0.00
15-min: 5.29
5.86
use:
Road prop z
0.05
0.95
0.05
time of concentration
30-min: 3.83
4.34
SKIP
known area =
ac.
Lawn
0.07
0.3
0.02
L = 354
60-min: 2.5
2.89
SKIP
known C =
Build allow
0.00
0.95
0.00
Hi pt 296
Residential
0.5
0.00
Low point 287
USE
area =
0.12
acres
Commercial
0.6
0.00
Diff elev = 9
USE
C-aver =
0.57
Total
0.07
Tc = 2.94785
min
USE
ITotal Area I
0.12
Caver =
0.57
15 min, 10y7.85
in/hr
USE
IMPERVIOUS AREA
0.07 Ac
soil type: sandy -clay
PERVIOUS AREA =
0.05 Ac
Use C=0.3 C =
0.57 from table
8.03a runoff coefficient or from weighted c from above 7.82
s
4
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr
length = ft
s
WEST END 110 7.85 IN/HR FROM NOOA
http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
z
width =
0 if triangular must be zero
TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
1.13 %
C-COEFF = 0.57
side slope =
4 ft per ft
L= 0
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
0.54 cfs
tc = 0 MIN
USE Tc = 5 min
04
02
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Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
i
2 a .6 .6 1.0 2 a
6 8 10 20
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR, Product of Velocity and Hydraulic Radius
VR -
Top width
hydraulice
with 0.5'
grass
Bottom width depth ft. Q10 cfs n from table n from
radius times comments
velocity
area of R-hydraulic Wetted Top width
freeborad
condition
0.54 curve
Vel calculate
fps
channel radius Perimeter ft.
ft
computed
sq. ft. ft.
D
0.00
0.6
1 0.59
0.170
0.12
checkHR Depth OK
I #DIV/0! #DIV/0!
0.41
1.44
0.29
4.95
4.8
8.8
okay
####
C
0.00
Ina
#DIV/0!
0.210
#DIV/0!
#DIV/M
0.00
#DIV/0!
0.00
0
4
use depth =
ft.
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = n 9d rfc cinr nor n-f rnnrli4inn
condition
depth ft.
Q10 cfs
0.54
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.2
0.27
0.02
check
no liner req'd
1.67
0.16
0.10
1.65
1.6
Excelsior
0.35
0.72
0.033
okay
1.47
0.49
0.17
2.89
2.8
shear stress = U.2b lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:20 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE-5-MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 5
STA 680-020 BLOSSOM right Woods 0.00 0.05
0.00
description:
Road EX A 0.00 0.95
0.00
use:
Road prop z 0.05 0.95
0.05
SKIP
known area =
ac. Lawn 0.08 0.3
0.02
SKIP
known C =
Build allow 0.00 0.95
0.00
Residential 0.5
0.00
USE
area =
0.13 acres Commercial 0.6
0.00
USE
C-aver =
0.55 Total
0.07
USE
ITotal Area I 0.13 Caver=
0.55
USE
IMPERVIOUS AREA 0.08 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.05 Ac
Use C=0.3
C =
0.55 from table 8.03a runoff coefficient or from weighted c from above
7.82
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr length = ft
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width =
0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
0.93 % C-COEFF = 0.55
i
side slope =
4 ft per ft L= 0
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
0.56 cfs tc = 0 MIN
USE Tc = 5 min
oa
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 0.56 curve Vel calculate
computed
D 0.00 0.7 1 0.91 0.150 0.16 HR okay Depth OK
C 0.00 Ina #DIV/0! 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = n Sr rfc cinr nor n-f rnnrlifinn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10y7.85
in/hr
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MOT-�
.02
-1 2 4 .6 .6 1.0 2 a 6 8 10 20
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
0.47 1.96 0.34 1 5.77 5.6 9.6 jokay
#DIV/0! 0.00 #DIV/0! 1 0.00 0 4 ####
Ira
condition
depth ft.
Q10 cfs
0.56
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
0.72
0.02
depth okay
no liner req'd
1.99
0.36
0.15
2.47
2.4
Excelsior
0.35
0.65
0.033
okay
1.33
0.49
0.17
2.89
2.8
shear stress = U.2U lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:21 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 6MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 6
STA 680-020 BLOSSOM left Woods 0.00 0.05
0.00
description:
Road EX A 0.00 0.95
0.00
use:
Road prop z 0.05 0.95
0.05
SKIP
known area =
ac. Lawn 0.08 0.3
0.02
SKIP
known C =
Build allow 0.00 0.95
0.00
Residential 0.5
0.00
USE
area =
0.13 acres Commercial 0.6
0.00
USE
C-aver =
0.55 Total
0.07
USE
ITotal Area 1 0.13 Caver=
0.55
USE
IMPERVIOUS AREA 0.08 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.05 Ac
Use C=0.3
C =
0.55 from table 8.03a runoff coefficient or from weighted c from above
7.82
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr length = ft
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width =
0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
0.93 % C-COEFF = 0.55
i
side slope =
4 ft per ft L= 0
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
0.56 cfs tc = 0 MIN
USE Tc = 5 min
oa
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 0.56 curve Vel calculate
computed
D 0.00 0.7 1 0.91 0.150 0.16 HR okay Depth OK
C 0.00 Ina #DIV/0! 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = n Sr rfc cinr nor n-f rnnrlifinn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10y7.85
in/hr
M■
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.02
-1 2 4 .6 .6 1.0 2 a 6 8 10 20
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
0.47 1.96 0.34 1 5.77 5.6 9.6 jokay
#DIV/0! 0.00 #DIV/0! 1 0.00 0 4 ####
Ira
condition
depth ft.
Q10 cfs
0.56
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
0.72
0.02
depth okay
no liner req'd
1.99
0.36
0.15
2.47
2.4
Excelsior
0.35
0.65
0.033
okay
1.33
0.49
0.17
2.89
2.8
shear stress = U.21J lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:21 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 7 MICRO TOWER .xlsx
INPUT:
SWALE #
7 STA 920-1800 BLOSSOM right
Woods
description:
Road EX A:
use:
Road prop c
SKIP
known area =
ac.
Lawn
SKIP
known C =
Build allow
Residential
USE
area =
0.51
acres
Commercial
USE
C-aver =
0.57
USE
USE
Use C=0.3
WEST END
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
0.00
0.05
0.00
10-min: 6.28
6.94
0.00
0.95
0.00
15-min: 5.29
5.86
0.21
0.95
0.20
time of concentration
30-min: 3.83
4.34
0.30
0.3
0.09
L = 354
60-min: 2.5
2.89
0.00
0.95
0.00
Hi pt 296
0.5
0.00
Low point 287
0.6
0.00
Diff elev = 9
Total
0.29
Tc = 2.94785
min
0.51IC-aver = 1
0.57
15 min, 10y7.85
in/hr
IMNCKVIUUS AKI--A= U.3 AC
soil type: sandy -clay I PERVIOUS AREA = 0.21 Ac
C = 0.57 from table 8.03a runoff coefficient or from weighted c from above 7.82
Tc = 5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT = 0.75 in/hr length = ft
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width = 0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD N
channel slope = 1.11 % C-COEFF = 0.57 i
side slope = 4 ft per ft L= 0
SLOPE 5 m .ae
OUTPUT: .oe
010 = 2.27 1 cfs tc = 0 MIN
oa
USE Tc = 5 min
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 2.27 curve Vel calculate
computed
D 0.00 0.8 1 2.38 0.090 0.36 HR okay Depth OK
C 0.00 Ina #DIV/0! 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
i i- C11 n = 9 97 rfc cinr nor n-f rnnrlifinn
M■
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1 ? .6 .6 1.0 2 A 6 8 10 20
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity
area of
R-hydraulic
Wetted
Top width
freeborad
fps
channel
radius
Perimeter
ft.
ft
sq. ft.
ft.
0.93
2.56
0.39
6.60
6.4
10.4
okay
#DIV/0!
0.00
#DIV/0!
0.00
0
4
####
ft.
condition
depth ft.
Q10 cfs
2.27
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
0.78
0.02
check
liner req'd
2.17
0.36
0.15
2.47
2.4
Excelsior
0.55
2.39
0.033
okay
1.97
1.21
0.27
4.54
4.4
shear stress = U.38 lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:22 AM

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
FILE:
SWALE- 8 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # H
STA 1800-2000 BLOSSOM right
Woods
0.00
0.05
0.00
description:
Road EX A
0.00
0.95
0.00
use:
Road prop z
0.25
0.95
0.24
SKIP
known area =
ac.
Lawn
0.36
0.3
0.11
SKIP
known C =
Build allow
0.00
0.95
0.00
Residential
0.5
0.00
USE
area =
0.61
acres
Commercial
0.6
0.00
USE
C-aver =
0.57
Total
0.35
USE
ITotal Area
I 0.61
Caver=
0.57
USE
IMPERVIOUS AREA 0.36 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.25 Ac
Use C=0.3
C =
0.57 from table
8.03a runoff coefficient or from weighted c from above
7.82
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr length = ft
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width =
0 if triangular must be zero
TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
2.5 %
C-COEFF = 0.57
side slope =
4 ft per ft
L= 0
i
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
2.71 cfs
tc = 0 MIN
USE Tc = 5 min
oa
os
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10y7.85
in/hr
M■
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MEN
Grass checl PERMANENT use figure 8.05c Mannings n for grass- make sure HR times velocity yields same n
-1
z a .6 .6 1.0 2 a
s 8 10 20
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR, Product of Velocity and Hydraulic Radius
VR -
Top wldth
hydraulice
with 0.5'
grass
Bottom width depth ft. Q10 cfs n from table n from radius times comments
velocity
area of R-hydraulic Wetted Top width
freeborad
condition
2.71 curve Vel calculate
fps
channel radius Perimeter ft.
ft
computed
sq. ft. ft.
D
0.00
0.75
1 3.38
0.080
0.55
HR okay Depth OK
I #DIV/0! #DIV/0!
1.50
2.25
0.36
6.18
6
10
okay
####
C
0.00
Ina
#DIV/0!
0.210
#DIV/0!
#DIV/M
0.00
#DIV/0!
0.00
0
4
use depth =
ft.
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- C11n = 9 71 rfc cinr nor n-f rnnrlifinn
condition
depth ft.
Q10 cfs
2.71
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.17
0.02
check
liner req'd
3.26
0.36
0.15
2.47
2.4
Excelsior
0.55
3.58
0.033
okay
2.96
1.21
0.27
4.54
4.4
shear stress = U.86 lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:22 AM

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
PRECIPITATION
FILE:
SWALE- q MICRO TOWER .xlsx
INTENSITY(IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
INPUT:
SWALE # 9
STA 2000-2300 BLOSSOM right
Woods
0.00
0.05
0.00
10-min: 6.28
6.94
description:
Road EX A
0.00
0.95
0.00
15-min: 5.29
5.86
use:
Road prop z
0.32
0.95
0.30
time of concentration
30-min: 3.83
4.34
SKIP
known area =
ac.
Lawn
0.48
0.3
0.14
L = 354
60-min: 2.5
2.89
SKIP
known C =
Build allow
0.00
0.95
0.00
Hi pt 296
Residential
0.5
0.00
Low point 287
USE
area =
0.80
acres
Commercial
0.6
0.00
Diff elev = 9
USE
C-aver =
0.56
Total
0.45
Tc = 2.94785
min
USE
ITotal Area I
0.80
Caver =
0.56
15 min, 10y7.85
in/hr
USE
IMPERVIOUS AREA
0.48 Ac
soil type: sandy -clay
PERVIOUS AREA =
0.32 Ac
Use C=0.3 C =
0.56 from table
8.03a runoff coefficient or from weighted c from above 7.82
s
a
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr
length = ft
s
WEST END 110 7.85 IN/HR FROM NOOA
http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
z
width =
0 if triangular must be zero
TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
4.96 %
C-COEFF = 0.56
side slope =
3 ft per ft
L= 0
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
3.52 cfs
tc = 0 MIN
USE Tc = 5 min
oa
02
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tip■■■►i
►�fi�■i_���
�1■�FOS®1
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■ENNEN
i�0:''::'.MEN
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
l
2 a .6 .6 1.0 2 a
6 8 10 20
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR, Product of Velocity and Hydraulic Radius
VR -
Top width
hydraulice
with 0.5'
grass
Bottom width depth ft. Q10 cfs n from table n from
radius times comments
velocity
area of R-hydraulic Wetted Top width
freeborad
condition
3.52 curve
Vel calculate
fps
channel radius Perimeter ft.
ft
computed
sq. ft. ft.
D
0.00
0.75
1 4.02
0.070
0.85
HR okay Depth OK
I #DIV/0! #DIV/0!
2.38
1.69
0.36
4.74
4.5
7.5
okay
####
C
0.00
Ina
I #DIV/0!
1
0.210
#DIV/0!
#DIV/M
0.00
#DIV/0!
0.00
0
3
use depth =
ft.
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = 3 90 rfc cinr nor n-f rnnrlifinn
condition
depth ft.
Q10 cfs
3.52
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.22
0.02
check
liner req'd
4.52
0.27
0.14
1.90
1.8
Coconut Fiber
0.55
3.73
0.033
okay
4.11
0.91
0.26
3.48
3.3
shear stress = 1. (U lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Coconut Fiber Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:24 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 10 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 10
STA 920-1800 BLOSSOM left Woods 0.00 0.05
0.00
description:
Road EX A 0.00 0.95
0.00
use:
Road prop z 0.06 0.95
0.06
SKIP
known area =
ac. Lawn 0.09 0.3
0.03
SKIP
known C =
Build allow 0.00 0.95
0.00
Residential 0.5
0.00
USE
area =
0.15 acres Commercial 0.6
0.00
USE
C-aver =
0.56 Total
0.08
USE
ITotal Area 1 0.15 Caver=
0.56
USE
IMPERVIOUS AREA 0.09 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.06 Ac
Use C=0.3
C =
0.56 from table 8.03a runoff coefficient or from weighted c from above
7.82
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr length = ft
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width =
0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
1.11 % C-COEFF = 0.56
side slope =
4 ft per ft L= 0
i
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
0.66 cfs tc = 0 MIN
USE Tc = 5 min
oa
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 0.66 curve Vel calculate
computed
D 0.00 0.6 1 0.71 0.140 0.14 HR okay Depth OK
C 0.00 Ina I #DIV/0! I 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- C11n = n rr rfc cinr nor n-f rnnrlifinn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10y7.85
in/hr
M■
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�1■����®1
�:��
�C■HI��
MOT-�
.02
-1 2 4 .6 .6 1.0 2 a 6 8 10 20
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
0.49 1.44 0.29 4.95 4.8 8.8 okay
#DIV/0! 0.00 #DIV/0! 0.00 0 4 ####
Ira
condition
depth ft.
Q10 cfs
0.66
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
0.78
0.02
depth okay
liner req'd
2.17
0.36
0.15
2.47
2.4
Excelsior
0.55
1.21
0.065
okay
1.00
1.21
0.27
4.54
4.4
shear stress = U.38 lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:27 AM

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
FILE:
SWALE- 11 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 11
STA 2325-2616 BLOSSOM left
Woods
0.00
0.05
0.00
description:
Road EX A
0.00
0.95
0.00
use:
Road prop z
0.09
0.95
0.09
SKIP
known area =
ac.
Lawn
0.37
0.3
0.11
SKIP
known C =
Build allow
0.08
0.95
0.08
Residential
0.5
0.00
USE
area =
0.54
acres
Commercial
0.6
0.00
USE
C-aver =
0.50
Total
0.27
USE
ITotal Area
1 0.54
Caver=
0.50
USE
IMPERVIOUS AREA 0.37 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.17 Ac
Use C=0.3
C =
0.50 from table
8.03a runoff coefficient or from weighted c from above
7.82
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr length = ft
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width =
0 if triangular must be zero
TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
4.96 %
C-COEFF = 0.50
side slope =
4 ft per ft
L= 0
i
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
2.14 cfs
tc = 0 MIN
USE Tc = 5 min
oa
.02
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10y7.85
in/hr
M■
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�■H��EN
on0"T
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-_�i�
■E
MINI1�i��
MEN
Grass checl PERMANENT use figure 8.05c Mannings n for grass- make sure HR times velocity yields same n
-1
z a .6 .6 1.0 2 a
s 8 10 20
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR, Product of Velocity and Hydraulic Radius
VR -
Top width
hydraulice
with 0.5'
grass
Bottom width depth ft. Q10 cfs n from table n from radius times comments
velocity
area of R-hydraulic Wetted Top width
freeborad
condition
2.14 curve Vel calculate
fps
channel radius Perimeter ft.
ft
computed
sq. ft. ft.
D
0.00
0.6
1 2.62
0.080
0.53
HR okay Depth OK
I #DIV/0! #DIV/0!
1.82
1.44
0.29
4.95
4.8
8.8
okay
####
C
0.00
Ina
I #DIV/0!
1
0.210
#DIV/0!
#DIV/M
0.00
#DIV/0!
0.00
0
4
use depth =
ft.
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- C11n = 9 1d rfc cinr nor n-f rnnrli4inn
condition
depth ft.
Q10 cfs
2.14
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.65
0.02
check
liner req'd
4.59
0.36
0.15
2.47
2.4
Coconut Fiber
0.35
2.27
0.022
okay
4.62
0.49
0.17
2.89
2.8
shear stress = 1.08 lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Coconut Fiber Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:27 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 12 MICRO TOWER .xlsx
INPUT:
SWALE #
12 STA 2616-2855 BLOSSOM left
Woods
description:
Road EX A:
use:
Road prop c
SKIP
known area =
ac.
Lawn
SKIP
known C =
Build allow
Residential
USE
area =
2.97
acres
Commercial
USE
C-aver =
0.49
USE
USE
Use C=0.3
WEST END
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
0.00
0.05
0.00
10-min: 6.28
6.94
0.00
0.95
0.00
15-min: 5.29
5.86
0.19
0.95
0.18
time of concentration
30-min: 3.83
4.34
2.12
0.3
0.64
L = 354
60-min: 2.5
2.89
0.66
0.95
0.63
Hi pt 296
0.5
0.00
Low point 287
0.6
0.00
Diff elev = 9
Total
1.44
Tc = 2.94785
min
2.97 Caver = 1
0.49
15 min, 10y7.85
in/hr
IMNCKVIUUJ AKI--A= 2.12 AC
soil type: sandy -clay I PERVIOUS AREA = 0.85 Ac
C = 0.49 from table 8.03a runoff coefficient or from weighted c from above 7.82
Tc = 5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT = 0.75 in/hr length = ft
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/bfds map cont.hti
type channel: TRI
width = 0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD N
channel slope = 1.14 % C-COEFF = 0.49 i
side slope = 4 ft per ft L= 0
SLOPE 5 m .ae
OUTPUT: .oe
010 = 11.33 cfs tc = 0 MIN
oa
USE Tc = 5 min
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 11.33 curve Vel calculate
computed
D 0.00 1.3 1 13.64 0.058 1.27 HR okay Depth OK
C 0.00 Ina #DIV/0! 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
i i- C11 n = 11 33 rfc cinr nor n-f rnnrli4inn
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VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity
area of
R-hydraulic
Wetted
Top width
freeborad
fps
channel
radius
Perimeter
ft.
ft
sq. ft.
ft.
2.02
6.76
0.63
10.72
10.4
14.4
okay
#DIV/0!
0.00
#DIV/0!
0.00
0
4
####
ft.
condition
depth ft.
Q10 cfs
11.33
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
0.79
0.02
check
liner req'd
2.20
0.36
0.15
2.47
2.4
Coconut Fiber
0.9
13.48
0.022
okay
4.16
3.24
0.44
7.42
7.2
shear stress = U.64 lb per sq. tt., formula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Coconut Fiber Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:28 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 13 MICRO TOWER .xlsx
INPUT:
SWALE #
13 STA 2855-3031 BLOSSOM left
Woods
description:
Road EX A:
use:
Road prop c
SKIP
known area =
ac.
Lawn
SKIP
known C =
Build allow
Residential
USE
area =
3.56
acres
Commercial
USE
C-aver =
0.48
USE
USE
Use C=0.3
WEST END
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
0.00
0.05
0.00
10-min: 6.28
6.94
0.00
0.95
0.00
15-min: 5.29
5.86
0.22
0.95
0.21
time of concentration
30-min: 3.83
4.34
2.56
0.3
0.77
L = 354
60-min: 2.5
2.89
0.78
0.95
0.74
Hi pt 296
0.5
0.00
Low point 287
0.6
0.00
Diff elev = 9
Total
1.72
Tc = 2.94785
min
3.56 Caver = 1
0.48
15 min, 10y7.85
in/hr
IMNCKVIUUJ AKI--A= 2.Ob AC
soil type: sandy -clay I PERVIOUS AREA = 1 Ac
C = 0.48 from table 8.03a runoff coefficient or from weighted c from above 7.82
Tc = 5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT = 0.75 in/hr length = ft
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width = 0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD N
channel slope = 1.86 % C-COEFF = 0.48 i
side slope = 4 ft per ft L= 0
SLOPE 5 m .ae
OUTPUT: .oe
010 = 13.49 cfs tc = 0 MIN
oa
USE Tc = 5 min
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 13.49 curve Vel calculate
computed
D 0.00 1.2 1 16.32 0.050 1.65 HR okay Depth OK
C 0.00 Ina #DIV/0! 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- C11n = 93 IQ rfc cinr nor n-f rnnrli4inn
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VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity
area of
R-hydraulic
Wetted
Top width
freeborad
fps
channel
radius
Perimeter
ft.
ft
sq. ft.
ft.
2.83
5.76
0.58
9.90
9.6
13.6
okay
#DIV/0!
0.00
#DIV/0!
0.00
0
4
####
ft.
condition
depth ft.
Q10 cfs
13.49
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.01
0.02
check
liner req'd
2.81
0.36
0.15
2.47
2.4
Coconut Fiber
0.85
14.79
0.022
okay
5.12
2.89
0.41
7.01
6.8
shear stress = U.99 lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Coconut Fiber Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:37 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 14 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 14
STAG-740 WHISTTERIA LEFT Woods 0.00 0.05
0.00
description:
Road EX A 0.00 0.95
0.00
use:
Road prop z 0.25 0.95
0.24
SKIP
known area =
ac. Lawn 1.23 0.3
0.37
SKIP
known C =
Build allow 0.43 0.95
0.41
Residential 0.5
0.00
USE
area =
1.91 acres Commercial 0.6
0.00
USE
C-aver =
0.53 Total
1.02
USE
ITotal Area I 1.91 Caver=
0.53
USE
IMPERVIOUS AREA 1.23 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.68 Ac
Use C=0.3
C =
0.53 from table 8.03a runoff coefficient or from weighted c from above
7.82
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr length = ft
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width =
0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD
N
channel slope =
2.1 % C-COEFF = 0.53
side slope =
4 ft per ft L= 0
i
SLOPE 5
m .ae
OUTPUT:
.ae
010 =
7.97 cfs tc = 0 MIN
USE Tc = 5 min
oa
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 7.97 curve Vel calculate
computed
D 0.00 0.96 1 8.11 0.059 1.02 HR okay Depth OK
C 0.00 Ina #DIV/0! 0.210 #DIV/0! I #DIV/0! #DIV/0!
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = 7 Q7 rfc cinr nor n-f rnnrli4inn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10y7.85
in/hr
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VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity
area of
R-hydraulic
Wetted
Top width
freeborad
fps
channel
radius
Perimeter
ft.
ft
sq. ft.
ft.
2.20
3.69
0.47
7.92
7.68
11.68
okay
#DIV/0!
0.00
#DIV/0!
0.00
0
4
####
ft.
condition
depth ft.
Q10 cfs
7.97
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.08
0.02
check
liner req'd
2.99
0.36
0.15
2.47
2.4
Excelsior
0.8
8.91
0.033
okay
3.48
2.56
0.39
6.60
6.4
shear stress = 1.Ub lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
0.5'-2.0' 0.022-0.014
3/29/2022, 11:37 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 15 MICRO TOWER .xlsx
INPUT:
SWALE #
15 STA740-950 WHISTTERIA LEFT
Woods
description:
Road EX A:
use:
Road prop c
SKIP
known area =
ac.
Lawn
SKIP
known C =
Build allow
Residential
USE
area =
2.08
acres
Commercial
USE
C-aver =
0.53
USE
USE
Use C=0.3
WEST END
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
0.00
0.05
0.00
10-min: 6.28
6.94
0.00
0.95
0.00
15-min: 5.29
5.86
0.30
0.95
0.29
time of concentration
30-min: 3.83
4.34
1.35
0.3
0.41
L = 354
60-min: 2.5
2.89
0.43
0.95
0.41
Hi pt 296
0.5
0.00
Low point 287
0.6
0.00
Diff elev = 9
Total
1.10
Tc = 2.94785
min
2.08 Caver = 1
0.53
15 min, 10y7.85
in/hr
IMF'CKVIUUJ AKI--A= 1.30 AC
soil type: sandy -clay I PERVIOUS AREA = 0.73 Ac
C = 0.53 from table 8.03a runoff coefficient or from weighted c from above 7.82
Tc = 5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT = 0.75 in/hr length = ft
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width = 0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD N
channel slope = 7.9 % C-COEFF = 0.53 i
side slope = 4 ft per ft L= 0
SLOPE 5 m .ae
OUTPUT: .oe
010 = 8.62 1 cfs tc = 0 MIN
oa
USE Tc = 5 min
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 8.62 curve Vel calculate
computed
D 0.00 0.8 11.41 0.050 1.73 HR okay Depth OK
C 0.00 0.85 9.58 0.070 1.37 HR okay Depth OK
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
i i- C11 n = R R9 rfc cinr nor n-f rnnrli4inn
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VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
4.46 1 2.56 0.39 6.60 6.4 10.4
171
condition
depth ft.
Q10 cfs
8.62
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
2.09
0.02
check
liner req'd
5.79
0.36
0.15
2.47
2.4
NAG C125BN
0.56
8.47
0.026
check
6.76
1.25
0.27
4.62
4.48
shear stress = 2. /6 lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
NAG C125BN Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
nA Green C125BN 2.8 0.5'-2.0' 0.023
3/29/2022, 11:38 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 16 MICRO TOWER .xlsx
INPUT:
SWALE #
STA950-1070 WHISTTERIA LEFT
Woods
description:
Road EX A:
use:
Road prop c
SKIP
known area =
ac.
Lawn
SKIP
known C =
Build allow
Residential
USE
area =
2.19
acres
Commercial
USE
C-aver =
0.53
USE
USE
Use C=0.3
WEST END
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
0.00
0.05
0.00
10-min: 6.28
6.94
0.00
0.95
0.00
15-min: 5.29
5.86
0.33
0.95
0.31
time of concentration
30-min: 3.83
4.34
1.40
0.3
0.42
L = 354
60-min: 2.5
2.89
0.46
0.95
0.44
Hi pt 296
0.5
0.00
Low point 287
0.6
0.00
Diff elev = 9
Total
1.17
Tc = 2.94785
min
2.19 Caver = 1
0.53
15 min, 10y7.85
in/hr
IMNCKVIUUS AKI--A= 1.4 AC
soil type: sandy -clay I PERVIOUS AREA = 0.79 Ac
C = 0.53 from table 8.03a runoff coefficient or from weighted c from above 7.82
Tc = 5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT = 0.75 in/hr length = ft
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width = 0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD N
channel slope = 4.2 % C-COEFF = 0.53 i
side slope = 4 ft per ft L= 0
SLOPE 5 m .ae
OUTPUT: .oe
010 = 9.19 cfs tc = 0 MIN
oa
USE Tc = 5 min
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 9.19 curve Vel calculate
computed
D 0.00 0.86 10.09 0.050 1.42 HR okay Depth OK
C 0.00 0.85 6.98 0.070 1.00 HR okay Check Depth
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
i i- C11 n = Q IQ rfc cinr nor n-f rnnrli4inn
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VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
3.41 1 2.96 0.42 7.09 6.88 10.88
171
condition
depth ft.
Q10 cfs
9.19
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.52
0.02
check
liner req'd
4.22
0.36
0.15
2.47
2.4
NAG C125BN
0.65
9.19
0.026
okay
5.44
1.69
0.32
5.36
5.2
shear stress = 1. (U lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
NAG C125BN Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
nA Green C125BN 2.8 0.5'-2.0' 0.023
3/29/2022, 11:38 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 17 MICRO TOWER .xlsx
INPUT:
SWALE #
STA300-740 WHISTTERIA LEFT
Woods
description:
Road EX A:
use:
Road prop c
SKIP
known area =
ac.
Lawn
SKIP
known C =
Build allow
Residential
USE
area =
0.36
acres
Commercial
USE
C-aver =
0.52
USE
USE
Use C=0.3
WEST END
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
0.00
0.05
0.00
10-min: 6.28
6.94
0.00
0.95
0.00
15-min: 5.29
5.86
0.10
0.95
0.10
time of concentration
30-min: 3.83
4.34
0.24
0.3
0.07
L = 354
60-min: 2.5
2.89
0.02
0.95
0.02
Hi pt 296
0.5
0.00
Low point 287
0.6
0.00
Diff elev = 9
Total
0.19
Tc = 2.94785
min
0.36 Caver = 1
0.52
15 min, 10y7.85
in/hr
IMNCKVIUUJ AKI--A= U.24 AC
soil type: sandy -clay I PERVIOUS AREA = 0.12 Ac
C = 0.52 from table 8.03a runoff coefficient or from weighted c from above 7.82
Tc = 5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT = 0.75 in/hr length = ft
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width = 0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD N
channel slope = 2.1 % C-COEFF = 0.52 i
side slope = 4 ft per ft L= 0
SLOPE 5 m .ae
OUTPUT: .oe
010 = 1.46 cfs tc = 0 MIN
oa
USE Tc = 5 min
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 1.46 curve Vel calculate
computed
D 0.00 0.6 1.52 0.090 031 HR okay Depth OK
C 0.00 0.75 1.65 0.150 =0 HR okay Depth OK
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = i dR rfc cinr nor n-f rnnrli4inn
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1 ? .6 .6 1.0 2 A 6 B 10 20
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
1.05 1 1.44 0.29 4.95 4.8 8.8
171
condition
depth ft.
Q10 cfs
1.46
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.08
0.02
check
liner req'd
2.99
0.36
0.15
2.47
2.4
Excelsior
0.5
2.40
0.035
okay
2.40
1.00
0.24
4.12
4
shear stress = U.66 lb per sq. tt., tormula I = yds, page b.Ub.12
comments: Excelsior Mat T = 1.55
Excelsior Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
nA Green C125BN 2.8 0.5'-2.0' 0.023
3/29/2022, 11:39 AM

SWALE DESIGN
PROJ: MAGNOLIA RIDGE SUBDIVISION
DATE: 3/27/2022
FILE: SWALE- 18 MICRO TOWER .xlsx
INPUT:
SWALE #
STA740-950 WHISTTERIA LEFT
Woods
description:
Road EX A:
use:
Road prop c
SKIP
known area =
ac.
Lawn
SKIP
known C =
Build allow
Residential
USE
area =
0.57
acres
Commercial
USE
C-aver =
0.48
USE
USE
Use C=0.3
WEST END
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
Area (Ac) C
C X A
5-min: 7.85
8.7
0.00
0.05
0.00
10-min: 6.28
6.94
0.00
0.95
0.00
15-min: 5.29
5.86
0.14
0.95
0.13
time of concentration
30-min: 3.83
4.34
0.41
0.3
0.12
L = 354
60-min: 2.5
2.89
0.02
0.95
0.02
Hi pt 296
0.5
0.00
Low point 287
0.6
0.00
Diff elev = 9
Total
0.28
Tc = 2.94785
min
0.57 Caver = 1
0.48
15 min, 10y7.85
in/hr
IMNCKVIUUJ AKI--A= U.41 AC
soil type: sandy -clay I PERVIOUS AREA = 0.16 Ac
C = 0.48 from table 8.03a runoff coefficient or from weighted c from above 7.82
Tc = 5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT = 0.75 in/hr length = ft
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds map cont.hti
type channel: TRI
width = 0 if triangular must be zero TIME OF CONCENTRATION - RATIONAL METHOD N
channel slope = 7.9 % C-COEFF = 0.48 i
side slope = 4 ft per ft L= 0
SLOPE 5 m .ae
OUTPUT: .oe
010 = 2.16 cfs tc = 0 MIN
oa
USE Tc = 5 min
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 2.16 curve Vel calculate
computed
D 0.00 0.55 2.63 0.080 0.58 HR okay Depth OK
C 0.00 0.75 3.20 0.150 0.52 HR okay Depth OK
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
ii- din = 9 iR rfc cinr nor n-f rnnrli4inn
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1 ? .6 .6 1.0 2 A 6 B 10 20
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
2.17 1 1.21 0.27 4.54 4.4 8.4
171
condition
depth ft.
Q10 cfs
2.16
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
2.09
0.02
check
liner req'd
5.79
0.36
0.15
2.47
2.4
Coconut Fiber
0.35
2.86
0.022
okay
5.84
0.49
0.17
2.89
2.8
shear stress = 1. (J lb per sq. tt., tormula I = yds, page b.U5.12
comments: Excelsior Mat T = 1.55
Coconut Fiber Straw with net T = 1.45
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
nA Green C125BN 2.8 0.5'-2.0' 0.023
3/29/2022, 11:39 AM

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
FILE:
SWALE- 20 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 19
STA950-1070 WHISTTERIA LEFT Woods
0.00
0.05
0.00
description:
Road EX A
0.00
0.95
0.00
use:
Road prop z
0.17
0.95
0.16
SKIP
known area =
ac. Lawn
0.61
0.3
0.18
SKIP
known C =
Build allow
0.02
0.95
0.02
Residential
0.5
0.00
USE
area =
0.80 acres Commercial
0.6
0.00
USE
C-aver =
0.45
Total
0.36
USE
ITotal Area I
0.80 Caver =
0.45
USE
IMPERVIOUS AREA =
0.61 Ac
soil type: sandy -clay
PERVIOUS AREA =
0.19 Ac
Use C=0.3
C =
0.45 from table 8.03a runoff coefficient or from weighted c from above
7.82
s
4
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
I TREATMENT =
0.75 in/hr
length =
ft
.3
WEST END
110 7.85 IN/HR FROM NOOA http://hdsc.nws.noaa.00v/hdsc/pfds/pfds
map cont.hti
type channel: TRI
z
width =
0 if triangular must be zero
H
channel slope =
4.2 %
m
side slope =
4 ft per ft
� .oa
OUTPUT:
.os
010 =
2.85 cfs
oa
Grass checl PERMANENT use figure 8.05c Mannings 'n' for grass- make sure HR times velocity yields same n
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5
VR-
hydraulice
grass Bottom width depth ft. Q10 cfs n from table n from radius times comments
condition 2.85 curve Vel calculate
computed
D 0.00 0.65 1 3.19 1 1 0.0751 0.59 HR okay Depth OK
C 0.00 0.8 1 3.20 1 1 0.1301 0.48 HR okay Depth OK
use depth =
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n' see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
iisa n1n = 9 8; rfc cinra narmanant rnnriitinn
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min:
7.85
8.7
10-min:
6.28
6.94
15-min:
5.29
5.86
time of concentration
30-min:
3.83
4.34
L = 354
60-min:
2.5
2.89
Hi pt 296
Low point 287
Diff elev = 9
Tc = 2.94785
min
15 min, 10 y 7.85
in/hr
LW9W Lug 3T I R
17^ 10 24' 6
6. io 10" C
2"
, 2 a 1 s s 1.0 a a s e ,o
VR, Product of Velocity and Hydraulic Radius
Top width
with 0.5'
velocity area of R-hydraulic Wetted Top width freeborad
fps channel radius Perimeter ft. ft
sq. ft. ft.
1.89 1.69 0.32 5.36 5.2 9.2
a
condition
depth ft.
Q10 cfs
2.85
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.52
0.02
check
liner req'd
4.22
0.36
0.15
2.47
2.4
Coconut Fiber
0.4
2.98
0.022
okay
4.65
0.64
0.19
3.30
3.2
shear stress = 1.05 lb per s . ft., formula T = ycls, page 8.05.12 COCONUT FIBER depth n
comments: Excelsior Mat T = 1.55 Ib/sqft NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
Coconut Fiber Straw with net T = 1.45 Ib/sqft nA Green C125BN 2.8 0.5'-2.0' 0.023
Class B Rip -Rap T = 3 Ib/sqft
Class 2 Riprap = T = 5 Ib/sgft 3/29/2022, 11:42 AM
20

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
FILE:
SWALE- 20 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 20
STA 3031-3300 BLOSSOM
Woods
0.00
0.05
0.00
description:
Road EX ASP
0.00
0.95
0.00
use:
Road prop asp
0.83
0.95
0.79
SKIP
known area =
ac.
Lawn
5.10
0.3
1.53
SKIP
known C =
Build allow
1.59
0.95
1.51
Residential
0.5
0.00
USE
area =
7.52
acres
I Commercial
0.6
0.00
USE
C-aver=
0.51
1 Totall
3.83
USE
Total Area
7.52
C-aver =
0.51
USE
IMPERVIOUS AREA = 5.1 Ac
soil type: sandy -clay
PERVIOUS AREA = 2.42 Ac
Use C=0.3
C =
0.51 from table 8.03a runoff coefficient or from weighted c from above
7.82
S
Tc =
10 minutes; calculate based on Fig.8.03a, use 5 minutes min.
a
I TREATMENT =
0.75 in/hr length = ft
.3
WEST END
110 6.28 IN/HR FROM NOOA htto://hdsc.nws.noaa.gov/hdsc/ofds/ofds mao
cont.html?
type channel: TRI
2
width =
0 if triangular must be zero
TIME OF CONCENTRATION - RATIONAL METHOD
y
channel slope =
1.86 %
C-COEFF = 0.51
m
side slope =
4 ft per ft
L = 590
SLOPE 5
tl
OUTPUT:
.06
Q10 =
24.05 cfs
tc = 15.18787 MIN
04
USE Tc = 10 min
02
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min: 7.85
8.7
10-min: 6.28
6.94
15-min: 5.29
5.86
30-min: 3.83
4.34
60-min: 2.5
2.89
17^ 10 24" 6
6" to 10" c
2n to 6, 0
Grass checl PERMANENT use figure 8.05c Mannings'n' for grass- make sure HR times velocity yields same n -i -2 .4 .6 .8 1.0 2 4 6 8 10 20
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5 VR, Product of Velocity and Hydraulic Radius
VR-
hydraulice Top width
radius with 0.5'
grass Bottom width depth ft. Q10 cfs n from table n from times comments velocity area of R-hydraulic Wetted Top width freeborad
condition 24.05 curve Vel calculate fps channel radius Perimeter ft. ft
computed sq. ft. ft.
C 1 0.00 1 1.45 1 24.57
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n'see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
Imp. 010 = 94 OS cfw winces narmanant cnnrlitinn
0.045 2.23 HR okay Depth OK 3.41 7.29 0.65 1 11.13 10.8 14.8 jokay
0.0551 2.06 HR okay Depth OK 2.92 8.41 0.70 1 11.96 11.6 15.6 okay
condition
depth ft.
Q10 cfs
24.05
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
1.01
0.02
check
liner req'd
2.81
0.36
0.15
2.47
2.4
Coconut Fiber
1.1
29.41
0.022
okay
6.08
4.84
0.53
1 9.07
8.8
ear stress = 1.2ts Ib per S . tt., tormula I = yds, page 6.U5.12
mments: Excelsior Mat T = 1.55
)conut Fiber Straw with net T = 1.45
Class B Rip -Rap T =
Class 2 Riprap = T =
Ib/sgft
Ib/sgft
3 Ib/sqft
5 Ib/sqft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
nA Green C125BN 2.8 0.5'-2.0' 0.023
3/29/2022, 11:43 AM

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
FILE:
SWALE- 21 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 21
STA 3300-3535 BLOSSOM
Woods
0.00
0.05
0.00
description:
Road EX ASP
0.00
0.95
0.00
use:
Road prop asp
0.88
0.95
0.84
SKIP
known area =
ac.
Lawn
5.70
0.3
1.71
SKIP
known C =
Build allow
1.59
0.95
1.51
Residential
0.5
0.00
USE
area =
8.17
acres
I Commercial
0.6
0.00
USE
C-aver=
0.50
1 Totall
4.06
USE
Total Area
8.17
1 C-aver =
0.50
USE
IMPERVIOUS AREA = 5.7 Ac
soil type: sandy -clay
PERVIOUS AREA = 2.47 Ac
Use C=0.3
C =
0.50 from table 8.03a runoff coefficient or from weighted c from above
7.82
S
Tc =
10 minutes; calculate based on Fig.8.03a, use 5 minutes min.
a
I TREATMENT =
0.75 in/hr length = ft
.3
WEST END
110 6.28 IN/HR FROM NOOA htto://hdsc.nws.noaa.gov/hdsc/ofds/ofds mao
cont.html?
type channel: TRI
2
width =
0 if triangular must be zero
TIME OF CONCENTRATION - RATIONAL METHOD
y
channel slope =
1 %
C-COEFF = 0.50
m
side slope =
4 ft per ft
L = 590
SLOPE 5
tl
OUTPUT:
.06
Q10 =
25.47 jcfs
tc= 15.513412 MIN
04
USE Tc = 10 min
02
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min: 7.85
8.7
10-min: 6.28
6.94
15-min: 5.29
5.86
30-min: 3.83
4.34
60-min: 2.5
2.89
17^ 10 24" 6
6" to 10" c
2n to 6, 0
Grass checl PERMANENT use figure 8.05c Mannings'n' for grass- make sure HR times velocity yields same n -i -2 .4 .6 .8 1.0 2 4 6 8 10 20
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5 VR, Product of Velocity and Hydraulic Radius
VR-
hydraulice Top width
radius with 0.5'
grass Bottom width depth ft. Q10 cfs n from table n from times comments velocity area of R-hydraulic Wetted Top width freeborad
condition 25.47 curve Vel calculate fps channel radius Perimeter ft. ft
computed sq. ft. ft.
C
0.00 1.55 26.31 0.045 2.06 HR okay Depth OK 2.74 1 9.61 0.75 1 12.78 12.4 16.4 okay
0.00 1.45 18.02 0.055 i 1.51 HR okay Check Dept[ 2.14 8.41 0.70 1 11.96 11.6 15.6 jokay
ilea rianth = ff
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n'see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
Imp. 010 = 95 47 cfw winces narmanant cnnrlitinn
condition
depth ft.
Q10 cfs
25.47
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.3
0.74
0.02
check
liner req'd
2.06
0.36
0.15
2.47
2.4
Coconut Fiber
1.2
27.20
0.022
okay
4.72
5.76
0.58
9.90
9.6
ear stress = U./S Ib per S . tt., tormula I = yds, page 6.U5.12
mments: Excelsior Mat T = 1.55
)conut Fiber Straw with net T = 1.45
Class B Rip -Rap T =
Class 2 Riprap = T =
Ib/sgft
Ib/sgft
3 Ib/sqft
5 Ib/sqft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
nA Green C125BN 2.8 0.5'-2.0' 0.023
3/29/2022, 11:43 AM

SWALE DESIGN
PROJ:
MAGNOLIA RIDGE SUBDIVISION
DATE:
3/27/2022
FILE:
SWALE- 20 MICRO TOWER .xlsx
Area (Ac) C
C X A
INPUT:
SWALE # 22
STA 2625-2750 BLOSSOM right
Woods
0.00
0.05
0.00
description:
Road EX ASP
0.00
0.95
0.00
use:
Road prop asp
0.03
0.95
0.03
SKIP
known area =
ac.
Lawn
0.04
0.3
0.01
SKIP
known C =
Build allow
0.02
0.95
0.02
Residential
0.5
0.00
USE
area =
0.09
acres
I Commerciall
1 0.6
0.00
USE
C-aver=
0.66
1 Totall
0.06
USE
ITotal Area
I 0.09
C-aver =
0.66
USE
IMPERVIOUS AREA = 0.04 Ac
soil type: sandy -clay
PERVIOUS AREA = 0.05 Ac
Use C=0.3
C =
0.66 from table 8.03a runoff coefficient or from weighted c from above
7.82
S
Tc =
5 minutes; calculate based on Fig.8.03a, use 5 minutes min.
a
I TREATMENT =
0.75 in/hr length = ft
.3
WEST END
110 7.85 IN/HR FROM NOOA htto://hdsc.nws.noaa.gov/hdsc/ofds/ofds mao
cont.html?
type channel: TRI
2
width =
0 if triangular must be zero
TIME OF CONCENTRATION - RATIONAL METHOD
y
channel slope =
8.75 %
C-COEFF = 0.66
m
side slope =
4 ft per ft
L= 0
SLOPE 5
tl
OUTPUT:
.06
Q10 =
0.47 cfs
tc = 0 MIN
04
USE Tc = 5 min
02
PRECIPITATION
INTENSITY (IN/HR)
10
25-Yr
5-min: 7.85
8.7
10-min: 6.28
6.94
15-min: 5.29
5.86
30-min: 3.83
4.34
60-min: 2.5
2.89
17^ 10 24" 6
6" to 10" c
2n to 6, 0
Grass checl PERMANENT use figure 8.05c Mannings'n' for grass- make sure HR times velocity yields same n -i -2 .4 .6 .8 1.0 a 4 6 8 10 20
grass type: use fescue which has a velocity capacity of 4.5 fps for slope < 5% velocity 4.5 VR, Product of Velocity and Hydraulic Radius
VR-
hydraulice Top width
radius with 0.5'
grass Bottom width depth ft. Q10 cfs n from table n from times comments velocity area of R-hydraulic Wetted Top width freeborad
condition 0.47 curve Vel calculate fps channel radius Perimeter ft. ft
computed sq. ft. ft.
C 1 0.00 1 1.45 1 53.30
TEMPORARY:
if velocity greater than 2 fps on bare earth then use temporary liner
for temporary liners 'n'see table 8.05e, for riprap see table 8.05f
bare earth n = 0.02 table 8.05b channel linings
Imp. 010 = 0 47 cfw winces narmanant cnnditinn
0.045 6.09 HR okay Depth OK 8.10 9.61 0.75 1 12.78 12.4 16.4 jokay
0.0551 4.46 HR okay Depth OK 6.34 8.41 0.70 1 11.96 11.6 15.6 okay
condition
depth ft.
Q10 cfs
0.47
n
comments
velocity
area
ft2
hydraulic
radius
Wetted
Perimeter ft
Top width
ft.
bare earth
0.2
0.74
0.02
depth okay
I liner req'd
4.65
0.16
0.10
1.65
1.6
Strw with net
0.3
0.68
0.065
okay
1.88
0.36
0.15
1 2.47
2.4
ear stress = 1.b4 ib per s . tt., tormuia i = yds, page 6.Ub.12
mments: Excelsior Mat T = 1.55
rw with net Straw with net T = 1.45
Class B Rip -Rap T =
Class 2 Riprap = T =
Ib/sgft
Ib/sgft
3 Ib/sqft
5 Ib/sqft
COCONUT FIBER depth n
NA Green C125 T= 2.35 Ib/sgft <0.5 0.022
nA Green C125BN 2.8 0.5'-2.0' 0.023
3/29/2022, 11:42 AM