SW6210903_Design Calculations_20210914

STORMWATER MANAGEMENT CALCULATIONS

SUPPLEMENT-EZ COVER PAGE
S1 i , i . I
PROJECT INFORMATION
1 Pro�Area
2 �ro
3 1 Coastal Wettand Area (ac)_
4 1 Surface Water Area (ac)
5 Is this project High or Low Density?
6 Does this project use an off -site SCM?
Carolina crossing
II 14C
No
COMPLIANCE WITH 0211 AGN14) _
_ _7 Width of vegetated setbacks provided (feet) _ _a
B Will the vegetated setback remain vegetated? NIA
9 If BUA Is proposed in the setback, does it meet NCAC 02H.1003 4� ► )? o
10 Is streambank stabilization proposed on this project? NQ _
NUMBER AND TYPE of SCM&: —
11 ' Infiltration System
12 Bioretention Cell
13 jWel Pond — — -
14
Stormwater Wetiand _
Permeable Pavement
15
18
Sand Fitter
18 1 Green Roof
19 Level Spreader -Filter Strip (LS-FS)
20 Disconnected Impervious Surface (DIS)
21 Treatment Swale
StofmFilter
Silva CEII
Bayfiher
26 ' Filterra
FORMS WADED
DESIGNER CERTIFICATION
Name and Title
Carlo Pardo, PE
r27
26
Orgenizalion:_
Tria_nole Site Design, PLLC
29
Street address:
4004 Barrett Drive, Suite 101
k 30
City, State, Yip'.
RaleiLlh, NC 27609
j 31
Phone numbers)
_ 919-553 G570
i 32
Email -
- - -
[e-mail] i
Certifice_tion Statement
I certify, under penalty of law that this Supplement-EZ form and ail supporting information were prepared under my direction or supervision; that the
information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete; and that the engineering plans,
specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here.
`,,ttlt111111fIlI)��
CARal���`''
SEAL
051571
r
.`
Signature of designer
L9,12
Date

DRAINAGE AREAS
1 115 this a qgh.densPty-project? _ Yes
2 If so, number of drainage areaslSCMs 1
3 _Does this project have low derrsi areas? No
4 If so. number of low density drainage areas 0
Is alUpart of this project subject to prevlous rule
5 versions?-_ - No
FORMS LOAD;

INFILTRATION SYSTEM
i 1 Drainage area number
Minimum r uired treatment volume cu ft f
- — ---���
358915 of
�2
IGENEKAILMDC FROM 02H .1050
3 Is the SCM sized to treat the SVV from all surfaces at t build -out?
Yes
4
Is the SCM Iacated away from oorttaminated soils?
_
Yes
What are the side slopes of the 5CM (H:V or ante► "Vertical' for
5
trenches)? _ _
,3�1 _
Does the SCM have retaining walls, gabion walls or other engineered
6
Na
?
Are the Inlets, outlets, and receiving stream protected from erosion
_ 1(1
0-year storm)? ___ _
Yes
t Is there an overflow or bypass for inflow volume in excess of the
8
I I-
design volume? _ _ _
Yes
Pump (preferrw)
9
hat is the method for dewatering the SCM for maintenance?
Yes
10
If applicable, will the SCM be cleaned out after construction?
Yes
11
_
Does the maintenance access comply with General MDC (8)?
Yes
12
Does the drainage easement comply with General MDC (9)?
13 If the SCM is on a single family lot, does (will?) the plat comply with
}1General
MDC (10)?
NIA
Yes
14 41s there an O&M Agreement that complies with General MDC (11)?
15 1III
Is there an O&M Plan that complies with General MDC (12)?
Yes
16
c
Does the SCM follow the device spec MDC?
Yes
_
17
Was the SCM designed by an NC licensedprofessional?
e� --
INFILTRATION SYSTEM MDC FROM OZH .
18 JjProposed slope of the subgrade surface (%)
tab
No
19
Are terraces or baffles provided?
Forebey
_
20 T ofpretreatment:
So/fs Cato _
Was the soil investigated in the footprint and at the elevation of the
21
infiltration system? �^
Yes
22
SHWT elevation (tmsl) i
326•00
23
Depth to StiWT per soils reports On) -
168.00
24 r
Ground elevation at boring in soils re�ortr (fmsij _
340.00
Is a detailed hydrogeotoglc study attached If the separation Is
25
between 1 and 2 feet?
N/A
26
Soil infiltration rate (inlhr)
4-00
27
Factor of safety (FS) (2 is recommended):
2.00
€►evaclons
29 1
Bottom elevation (fmsl)
333 ft�
30
-
Storage elevation (fmsi)
335. ft
31 I
_
Bypass elevation (fmsl)
338 1 11
Fo► B_ wkiis Orrl _
32
Bottom surface area (ft) _
27755 fE
33
Storage elevation surface area Its)
l 31810. ft Y
liar 7rsnchas Only
-
34
Length (ft)
35
Width (ft)�
36
Perforated pipe diameter. If appficable (inches)
37
Number of laterals
38
Total le trig h of perforated pipl _
_39
Stone type. If applicable _
40o
Stone porosity (%)
41
Is stone free of fines?
_
42
Is the stone wrapped In aeotextile fabric?
43f
Has at least one inspection port been provided'?
-- -
FI—W eeViDrowdown
_
44 1 Design volume of SCM (cu ft)
35896 of
72 brs
45 Ttme to draw down (hours)
ADMONAL INFORMATION
46 Please use this space to provide any additional information about the
Infiltration system(s):
s�
i
4
Infiltration 1 8:09 AM 8/26/2021

Triangle Site Design, PLLC
Hoke, NC
Curve Number Calculation (CN)
Pre -Developed Conditions
2MJAwe Arai (dog): 34.53
Existing Soil Grow,
Safi Grouo Mao Symbol Soil Description Ames Pet nI of DA
A AuA Autryville Loamy Sand 22.05 64%
A CaB Candor Sand 4.60 13%
C BaB/SaD Blaney Loamy Sand 7.88 23%
Existing Land Uses:
Land Use ak4L= .Sol 6;rayo Acres Curve # WeiQhtad GN
Wooded - Good Stand A 26.56 50 38.5
Wooded - Good Stand C 7.88 80 18.3
Impervious A 0.09 98_3.
Cumulative Curve # = 57A

Triangle Site Design, PLLC
Curve Number Calculation (CN)
Post -Developed Conditions
]rainacle 12rres): 34.53
F,�, sting 5ed-
Grou Man Symbol Soil Descri i n
Acres
Percent of DA
A AuA Autryville Loamy Sand
22.05
64%
A CaB Candor Sand
4.60
130/0
C SaWaD Blaney Loamy Sand
7.88amwmv
23°k
Lod
lande2gS2Zjzbpn xi ti g,,,Soif Grnuu Acres
Curve #
Weigated CN
Impervious Area A/C 9,07
98
25.7
Open Space - Good Condition A 19.20
65
3U
Open Space - Goad Condition C 6.26
77
14.o
Cumulative Curve # =
70.3

Infiltration Basin Design
Site Information
Sub Area Location: Drainage To Infiltration Basin
Drainage Area (DA) _ " 34.63 Acres 1504315 sf
Impervious Area (IA) - ----9.07 Acres 395036 sf
Flefcant111118.2rVims 01 = 26.3 %
Required Water Quality Volume
Design Storm = i inch
Determine Rv Value = 0,05 + .009 (I) = 0.29 Iniin
Water Quality Volume =_ . 0,824 ac-ft
Water Quality Volume - 35,896 of
Water Quality Volume = 0.286 inches of runoff
@tQAA 1- ar,.24-hour event = 1.05 inches
fidfnlmum Suriaee Area
SA =
(12-FS'DV)I(K T)
Factor of Safety (FS) =
2
Design Volume (DV) =
35895.7 cf
Hydraulic Conductivity of Soil =
4.00 inlhr
Max Dewatering Time =
72 hours
SA =
2991.3 sf

STAGE/STORAGE TABLE
STAGE
ELEVATION
CONTOUR
INCRE1041AL
TOTAL
()
AREA (sr
F
r� F
0.0
333.0
27255
0
0
1.0
334.0
29505
28380
28380
2.0
335.0
31810
30658
59038
3.0
336.0
34170
32990
92028
4.0
337.0
36585
35378
127405
5.0
338.0
39060
37823
165228
6.0
339.0
41595
40328
205555
7.0
340.0
44180
42888
248443
STORMWATER MANAGEMENT DESIGN
INFILTRATION
RIVER BASIN:
RECEIVING STREAM:
STREAM INDEX:
STREAM CLASS:
Hue:
BASIN
DRAINAGE AREA TO POND:
LUMBER
LITTLE CREEK
14-2-17
C
03040203
I_65'1
34.53 ACRES
SITE IMPERVIOUS AREA TO POND: 9.07 ACRES
OFF -SITE DESIGN IMPERVIOUS AREA T P N 0,00 . CR .
TOTAL DESIGN IMPERVIOUS AREA TO POND: 9.07 ACRES
PRE -DEVELOPED POST -DEVELOPED POST DEVELOPED
H PQN2
DRAINAGE AREA: 34.53 AC 34.53 AC
CURVE NUMBER: 57.0 70.3
INFILTRATION RATE: 4.0 IN/HR
1.0" STORM EVENT:
0.155
CFS
0.000
CFS
1-YEAR STORM EVENT:
3.625 CFS
43.35
CFS
0.000
CFS
2-YEAR STORM EVENT:
10.35 CFS
67.34
CFS
0.000
CFS
10-YEAR STORM EVENT:
39.93 CFS
140.83
CFS
0.000
CFS
100-YEAR STORM EVENT:
104.08 CFS
273.59
CFS
127.33
CFS

Hydrograph
Report
8
Hydraflow Hydrographs Extension for AutoCADS Civil 3DQ 2009 by Autodesk, Inc. v6.066
Thursday, Aug 26, 2021
Hyd, No. 3
Post Through SCM
Hydrograph type
= Reservoir
Peak discharge
= 127.33 cfs
Storm frequency
= 100 yrs
Time to peak
= 12.03 hrs
Time interval
= 2 min
Hyd. volume
= 224,690 tuft
Inflow hyd. No.
= 2 - SCM Post -Developed
Reservoir name
= BMP Pond
Max. Elevation
= 339.49 ft
Max. Storage
= 226.405 cuft
Storage Indication method used. Exfiltration extracted from Outflow.
Hydrograph Discharge Table
Time Inflow Elevation CIvA Clv B Clv C PfRsr WrA
(hrs) cfs ft cfs cfs cfs cfs cfs
( Printed values - 1 00% of Op )
Wr B Wr C Wr D Exfil Outflow
cfs cfs cfs cfs cfs
11.93
273.59 <<
338.17 ----- -----
- ----- 1.816 -----
3.657
1.817
11.97
269.58
338.89 ----- -----
54.49
----- ----- 3.825
54.49
12,00
214.52
339.33 ----- ----
107.00 ----
---- ----- 3.931
107.00
12.03
136.38
339.49 << __--
-- ----- 127.33 -----
:---- 3.968
127,33 <<
12.D7
75.65
339.43 ----- -----
- ----- 119.25
----- ----- 3.954
119,25
12.10
47,22
339.28 ----- ----
----- ----- 100.12
----- 3.919
100.12
12.13
38.87
339.14 ----- -----
----- ----- 82.22
----- 3.884
82.22
12.17
37,29
339.02 -
- ----- 68.83 -----
----- 3,856
68.83
12.20
35.80
338.93 -----
--•- ---- 58.85
----- ----- 3.835
58.85
12.23
34.29
338.86 ----- -----
- ----- 51.45 -----
----- ----- 3,818
51.45
12.27
32.76
338.80 ---- -----
----- - --- 45.76
----- ----- 3.805
45.76
12.30
31.22
338.75 ----- -----
----- ----_ 41.43
- 3.794
41.43
12.33
29.67
338.72 ----- -----
----- ----- 37.79
3.785
37.79
12.37
28.10
338.68 ----- -
- ----- 34.78 -----
----- 3.777
34.78
12.40
26.53
338.65 ---- -
- 32.21
----- ----- 3,770
32.21
12.43
24.95
338.63 ----
29.87 -----
----- 3,764
29.87
12.47
23.35
338.60 ----- -----
----- - - 27,70
-- 3.758
27.70
12.50
21.75
338.58 ----- -----
----- ---- 25.83 -----
3.752
25.83
12.53
20.27
338.55
-- 24,04
- -- - 3.747
24.04
12.57
19.16
338.53 ----- -----
--... 22.35 -----
----- ----- 3,742
22.35
12.60
18.47
338.51 --
20.83 -----
3.737
20.83
12.63
18.04
338.50 ----- -----
----- - - 19.54
3.733
19.54
12.67
17.68
338.48 ----- -----
----- 18.53
3.730
18.53
12.70
17,32
338.47 -
----- 17.64 _
----- 3.727
17.64
12,73
16.97
338.46 -
-- 16.85 -----
----- ----- 3.724
16.85
12.77
16.61
338.45 ----- ----
-- 16.15 -----
----- ----- 3.722
16.15
12.80
16.25
338.44 -----
----- ----- 15.50
- 3.720
15.50
12.83
15.89
338.43 ----- -----
----- ----- 14.91 -----
----- - 3.718
14.91
12.87
15.52
338.42
- ----- 14.37 -
----- 3.716
14,37
12.90
15,16
338.42 -----
----- ----- 13.86
----- ----- 3.714
13.86
12.93
14.79
338.41 ----- -----
- - 13.37
----- ----- 3,712
13.37
12.97
14.43
338.40 - -----
----- ----- 12.91
3.711
12.91
13.00
14.06
338.39 -----
----- ----- 12.52 -----
- 3.709
12.52
13.03
13.71
338.39 ----
- 12.14
----- 3.708
12.14
13.07
13.41
338.38 ----
11.78 -----
----- ----- 3.706
11.78
13.10
13.17
338.38 ----- -----
----- 11.43
----- 3.705
11.43
13.13
12.96
338.37 -----
- ----- 11.10
- ----- 3.704
11.10
13.17
12.77
338.37 -----
---- 10.79
3.702
10.79
13.20
12.57
338.36 ----- -----
10.50
----- - 3.701
10.50
13.23
12.37
338.36 -
10.22 -----
----- 3.700
10.22
Continues on next page_..

0
Post Through 5CM
Hydrograph Discharge Table
Time
Inflow
Elevation
CIv A CIv B CIv C PfRsr
Wr A
Wr B Wr C
Wr D Exfil
Outflow
(hrs)
cfs
ft
cfs Cfs cfs cfs
cfs
Cfs Cfs
cfs cfs
cfs
13.27
12.18
338.35
----- ----- ----- -----
9.957
- ---
3.699
9.957
13.30
11.98
338.35
----- ----- ----- -----
9.704
----_ ___,_
3.698
9,705
13.33
11.78
338.34
-- _---- -- -
9.462
-_-_ ---
- 3.697
9.461
13.37
11.58
338.34
- -
9.225
} .- -----
-- -- 3.696
9.225
13,40
11.38
338.33
----- •---- ----- -----
8.995
----. -----
----- 3.695
8.995
13.43
11.18
338.33
----- ----- ----- -----
8,770
----- -----
=_--- 3.694
8.771
13.47
10.98
338.33
----- _-_-- ----_ --_--
8.549
----. -----
- --- 3,693
8.550
13.50
10.78
338.32
---- ----- -----
8.334
-----
--- 3.693
8.333
13.53
10.59
338.32
----- ----- ----- -----
8.120
----- -----
----- 3.692
8.119
13.57
10.41
338.32
----- ----- rt---- -----
7.909
-----
3.691
7.910
13.60
10.26
338.31
_-_
7.708
----- -----
---- 3.690
7.707
13.83
10.11
338.31
7.514
----- -----
----- 3.689
7.513
13.67
9.967
338.31
----- ---- ----- -----
7.327
---- -----
----- 3.688
7.327
13.70
9.824
338.30
----- ----- ----- -----
7.148
3.688
7.148
13.73
9.681
338.30
- - ----
6.976
--.-. -
3.687
6.975
13.77
9,537
338.30
6.842
----M -----
----- 3.686
6.843
13.80
9.394
338.29
----- ----- ----- -----
6.709
-.--- -----
----- 3.686
6.709
13.83
9.250
338.29
-----
6.574
3.685
6.574
13.87
9.106
338.29
----6
6.439
3.684
6.438
13.90
8.962
338.29
- -
6.301
- ».- -.---
----- 3.684
6.301
13.93
8.817
338.28
6.163
--44- -----
----- 3.683
6.164
13.97
8.672
338.28
-----
6.024
----- ----
3.682
6.025
14.00
8.528
338.28
5.885
___-- _. _
-- ._ 3.681
5.886
14.03
8.392
338.27
5.746
-•--- -----
---- 3.681
5,747
U.07
8,285
338.27
----- _..__ ----- -----
5.610
----- -----
----- 3.680
5.610
14.10
8.211
338.27
----- ----- ----- -----
5.479
.-_._ __-._
... 3.679
5.479
14.13
8.156
338,26
--- »W--- --_ --- -
5.357
----- -----
_--_- 3,679
5.356
14.17
8.107
338.28
-- _ ._.__ w_._
5.242
._... -_- .
-_.- 3.678
5.243
14.20
8.058
338.26
----- ----- ----- -----
5,138
-----
3.677
5.137
14,23
8.009
338.26
--- -----
_.w__
5,039
----- -----
----» 3.677
5.039
14,27
7.960
338.26
--- --
4.948
-----
-- 3.676
4.947
14.30
7.911
338.25
- - - -----
4.861
----- -
3.876
4.861
14,33
7.862
338.25
..-.-.. -» -. -_-_. ----
4.778
----- -----
----- 3.676
4.779
14.37
7.812
338.25
----- ----- ----- -----
4.701
----- -----
----- 3.675
4.701
14.40
7.763
338.25
----- _..-. ----- ----.
4.627
----- ----_
----4 3.675
4.627
14.43
7.714
338,25
.. .....
4,557
-----
- 3.674
4.556
14.47
7,664
338.24
----- ----
4.488
---»- -
- 3.674
4.488
14.50
7,615
338.24
4.422
3.674
4.423
14.53
7.565
338.24
----- ----- ---- -----
4.359
---- -----
--.-- 3.673
4.359
14.57
7.515
338.24
----- ----- ____. -----
4.297
3.673
4.297
14.60
7.468
338.24
-----
4.237
----- -__._
_. M_ 3.673
4.237
14.63
7.416
338.24
4.178
----- ____
_ ._ 3.672
4.178
14.67
7.366
338.24
----- -- - ---_- -----
4.120
----- 3.672
4.120
14.70
7.316
338.24
4.064
----- =---
__--. 3.672
4.063
14.73
7.266
338.23
------ ----- _,___, y_.
4.007
----- -..__
•:-»- 3.672
4.008
14.77
7.216
338.23
-.___ _-__ _
3.952
_.--- ---
-, _ 3.671
3,953
14.80
7,166
338.23
----- ----. . -- -----
3.899
- -----
----- 3.671
3.898
14.83
7.116
338.23
3.845
----- -_--_
----- 3.671
3.844
14.87
7,066
338.23
----- ----- ----- -----
3.791
----- -----
----- 3.670
3.791
14.90
7.015
338.23
----- ----- ----- -----
3.738
----- -----
----- 3.670
3.738
14.93
6,965
338.23
----- -- -----
3.685
----- -----
----- 3.670
3.685
14.97
6.915
338.23
--_.- ----- -
3.633
-----
----- 3.670
3.633
15.00
6.884
338.22
3.581
----- - -
----- 3.669
3.581
Continues on next page...

Post Through SCM
Hydrograph Discharge Table
Time
Inflow
Elevation
Clv A C1v B Clv C
PfRsr Wr A
Wr B
Wr C Wr D Exfil
Outflow
[hrs)
cfs
ft
cfs cfs cfs
cfs cfs
cfs
cfs cfs cfs
cfs
15.03
6.814
338.22
3.530
- -
- - 3.669
3.530
15.07
6.763
338.22
----- - ---
-- 3.477
----
----- 3.669
3.478
15,10
6.713
338.22
- --
--. 3.426
----
----- --,-- 3.669
3.427
15.13
6.662
338.22
-. ----- -----
3.375
- - 3.668
3.375
15.17
8.611
338.22
----- ----- -----
-- 3.325
----
--_- _ems 3.668
3.324
15.20
6.561
338.22
_-_-- - -
3.274
----- ----- 3.668
3.273
15.23
6.510
338.22
--- --- -
- 3.223
-----
----- ----- 3.668
3.222
15.27
6.459
338.22
----- ---- ---_-
--- - 3.172
---
_---_ ----- 3.667
3.171
15.30
6.408
338.21
----- ----- --_--
----- 3.121
-----
__._. __ __ 3.667
3.120
15.33
6.357
338.21
3.070
-----
----- - 3.667
3.069
15.37
6.306
338.21
3.019
----- --- 3.666
3.018
15.40
6.255
338.21
----- ----- -----
-__-- 2.968
---
---.- ----- 3.666
2.966
15.43
6.204
338.21
----- ----- -----
----_ 2.917
----.
___ _ . __. 3.666
2.917
15.47
6.153
338.21
2.866
--_--
----- ----_ 3.666
2.866
15.50
6.102
338.21
_.___ �.__.. ..
�- 2.815
-----
----- 3.665
2.815
15.53
6.050
338.21
----- ----- -----
- - 2.764
3.665
2.764
15.57
5.999
338.21----
----- --
- 2.713
-
- - - 3.665
2.713
15.60
5.948
338.20
----- ----- ----_
-- -- 2.662
----
----- ----- 3.665
2,662
15.63
5.896
338.20
2.611
-----
----- ----- 3.664
2.611
15.67
5.845
338.20
----- ----- -----
--. - 2.560
--_--
----- ----- 3.664
2.561
15.70
5.793
338.20
----- ----- -----
- 2.509
3.664
2.510
15.73
5.742
338.20
_ -----
2.462
-----
3.664
2.462
15.77
5.690
338.20
----- �- -�---
- 2.433
-----
�---- ----- 3.663
2.433
15.80
5.639
338.20
----- ----- -----
----- 2.403
-----
.._- ----- 3.663
2.403
15.83
5.587
338.20
----- -------------
2.370
-----
3.663
2.371
15.87
5.535
338.19
---_- .--- __ __
.___ 2.337
-----
•._.- ----- 3.662
2.337
15.90
5.484
338.19
-- - ----- ------
2.303
----_
----- ----- 3.662
2.302
15.93
5.432
338.19
-- -. ----- -----
----- 2.267
-----
-=--- ----- 3.662
2.267
15.97
5.380
338.19
__--- _ --- -----
----- 2.230
-----
---- --- 3.651
2.230
16.00
5.328
338.19
2.191
-----
----- ----- 3.661
2.192
16,03
5.280
338.19
----- -- --
- 2.153
-----
----- ----- 3.661
2.153
16.07
5.241
338.19
- -- -_ --._.
- 2.114
_____ 3.660
2.114
16.10
5,215
338.18
----- ----- - -
---__ 2.075
-----
---._ 3.660
2.075
16.13
5.195
338.18
-----
2.038
-----
--- --- 3.660
2.037
16.17
5.177
33$.18
____- _.._ A
2.002
-----
-- -- ----- 3.659
2.001
16.20
5.159
338.18
----- --- -
-. - - 1.956
-----
----- ----- 3.659
1.966
16.23
5.141
338.18
- --.-.
---- 1.933
-
----- ----- 3.659
1.933
16.27
5.123
338.18
----- ----- ----
- --- 1.900
-----
3.658
1.900
16.30
5.105
338.18
----- •---- -----
----- 1.869
----.
---.- __--- 3.658
1.869
16.33
5.087
338.17
1.838
-----
- ----- 3.658
1.838
16.37
5.069
338.17
- -
1.809
-
----- ----- 3.657
1.809
16.40
5.051
338.17
--
1.780
-----
----- -_--- 3.657
1.780
16.43
5.033
338.17
- .---- -----
---- 1.752
-----
----- --_-- 3.657
1.752
16.47
5.015
338.17
-� -_ ----- -----
----- 1.725
-----
--- _---. 3.657
1.725
16.50
4.998
338.17
-- ----- -
_-.-_ 1.69$
-----
w-_-_ ----} 3.656
1.698
16.53
4.980
338.17
1.673
--_-.
--,-- _ 3.656
1.672
16.57
4.961
338.17
----- ----- -•---
----t 1.647
-----
3.656
1.647
16.60
4.944
338.17
----- ----- -----
---1.622
-----
. __- _- -- 3.656
1.622
16.63
4.925
338A6
----- ----- -----
._- 1.598
-----
----_ -_--- 3.655
1.598
16.67
4.907
338.16
1.574
_____
_, __ ----- 3.655
1,574
16.70
4.889
338.16
-----
1.551
-----
----_ ----- 3.655
1.551
16.73
4.871
338.16
---_ ---_• ---
----- 1.527
---_-
- -- 3.655
1.528
16.77
4.853
338.16
- - - - -
----- 1.505
-----
3.6544
1.505
Continues on next page....

11
Post Through SCM
Hydrograph Discharge Table
Time
inflow
Elevation
Clv A Clv B Clv C PfRsr Wr A Wr B
Wr C Wr D Exfil
Outflow
ihrsj
Cfs
ft
cfs Cfs Cfs Cfs cfs Cfs
Cfs cfs Cfs
Cfs
16.80
4.835
338.16
---- 1.483 -----
3.654
1.483
16.83
4.817
338,16
----- ----- ----- ----- 1.460 -----
3.654
1.461
16-87
4.799
338.16
----- ----- ----- ----- 1.439 -----
- ----- 3.654
1.439
16.90
4.781
338.16
----- ----- 1.417 -----
3.654
1.418
16.93
4.763
338.16
----- ----- ----- 1.396 -----
----- 3.653
1.396
16.97
4.744
338.16
----- ...... ----- 1.375 -----
----- ----- 3.653
1.375
17.00
4.726
338.15
----- ----- ----- 1.355 -----
----- ----- 3.653
1.355
17.03
4.708
338.15
----- 1.334 -----
----- 3.653
1.334
17.07
4.690
33$.15
----- ---.. ----- 1.314 -----
- 3.653
1-314
17.10
4.672
338.15
----- ----- ----- ----- 1.293 -----
3.652
1-293
17.13
4.653
338.15
----- ----- ----- 1274 -----
3.652
1.273
End
19,+3 - 1193 '510 �111>

802021
ECMDS 7.0
NORTH
AMERICAN
GREEN
SPILLWAY ANALYSIS
North American Green
5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Name
Grass Spillway
Discharge
127.33
Peak Flow Period
5.3
Channel Slope
0.3333
Channel Bottom Width
30
Law Flow t.lner
Retardence Class
C 6-12 in
Vegetation Type
Mix (Sod and Bunch)
Vegetation Density
Very Good 80-95%
Sall Type
Sandy Loam (GM)
Shoremax - Class C - Mix (Sod & Bunch) - Very
Good 80-950k
Phase
Reach
Discharge
Velocity
Nn�al
lylannings N
permksafble
Calculated
Safety
Remarins
Steple
Depth
Sheer Stress
Shear Stress
Factor
Pattern
Shoremax w/
Straight 12733 cfs
14.92 ft/S
0.28 ft
0.025
8.5 lbs/ft2
5.92 lbs/ft2
1.44
STABLE
F
P550
Unvegetated
Underlying
Straight 127.33 cfs
14.92 ft/s
0.28 ft
0.025
8.05 Ibs/ft2
5.81 Ibs/ft2
1.38
STABLE
F
5ubsLrdlr
Shoremax w/
Straight 127.33 cfs
15.34 ft/S
0.28 ft
0.023
14 Ibs/ft2
5.75 IbsM
2.43
STABLE
F
P550 Reinforced
Verieial rnn
Under lymq
Straight 127.33 cfs
15.34 ft/s
0.28 ft
0.023
8.5 Ibs/ft2
5.65 lbs/ft2
1.51
STABLE
F
Sutfsirale
https://ecmde,com/project/l39235/spillway-analysis/2079331show 111

FLOW
SPILLWAY 0000)
LONG.
SLOPE(%)
H B W
SS
CHANNEL LINING
INFILTRATION 127.33 CFS
3.33
1.9' 30' 41.4'
3:1
STRAW WITH NET
NAG SHOREMAX
SPILLWAY
CLASS C W/ P550
W
EXTEND LINING TO
EXTEND LINING TO
TOP OF SPILLWAY
TOP
OF SPILLWAY
HH
CHANNEL LINING
�
MATTING SHALL BE AS
NOTED OR APPROVED
EQUAL
GRASS SPILLWAY
DETAIL
TOP OF EMBANKMENT
ELEVATION SPILLWAY ELEVATION
340.0
338.10
TOP OF EMBANKMENT=340.0
SPILLWAY ELEVATION=338.1
GRASS SOD ON SPILLWAY
AND SIDE SLOPES