SW8060211_APPROVED PLANS_20060222 (2)

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW d(.LQv�G
DOC TYPE
❑ CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
O
YYYYMMDD

LEGEND sym.
BEARINGAND DISTANCE
PROPERTY BOUNDARY
PARKING LOT
EXISTING TOPOGRAPHICAL LINE
LANDSCAPED
SIDEWALK
SEDIMENT FENCE
TEMPORARY DRIVE ENTRANCE
TEMPORARY SEDIMENT TRAP
SHEET FLOW
CURBING
POND FLOW PATH WALL
PLAN CHECKLIST
OWNER/SITE INFORMATION SEE TITLE BLOCK
ENGINEER AND FIRM SEE TITLE BLOCK
LEGEND
NORTH ARROW AS SHOWN ON PLAN
SCALE SEE TITLE BLOCK
REVISION NCI AND DATE SEE TITLE BLOCK
MEAN HIGH WATERLINE NA
DrMFWMWD PROPERTY/PROJECT BOUNDARY
VICINITY MAP, SHOWN ON PLAN
PROPOSED AND EXISTING CONTOURS
ROAD AND SCALE DETAILS
WETLAND BOUNDARIES
CALCULATIONS
DRAINAGE AREA
VEGETATED BUFFERS
GENERAL PROJECT INFORMATION
PROJECT NAME: TRI COAST PLAZA
PROJECT OWNER: TRI COAST PROPERTIES, LLC
1508 MILITARY CUTOFF RD
WILMINGTON. NC 28403
PROJECT ENGINEERING- MICHAEL C. GALLANT, P.E-
311 S. TOPSAIL DR.
SURF CITY, NC. 28445
PROJECT SURVEYING: THE CLARK GROUP
POST OFFICE BOX 10136
WILMINGTON. NC 28404
PROJECT ZONING: CITY ZONE B2
PROJECT SIZE: 1.87 ACRES
NOTE: SLOPE ALL FILLED AREAS 0 3:1 ALONG
PROPERTY LINES & STABILIZE WITH EXCELSIOUR
MAT.
NOTE: ALL RCP TO BE CLASS IV,
NOTE: SEE SEEDING CHART FOR POND BANK
STABILIZATION_
AVERAGEWIDTH CALCULATION
(REQUIRED SA) 4154 SO. FT.
(AVG FLOW LENGTH) 113.02 FT. =36.75 FT
LENGTH TO WIDTH RATIO = 3:1
NOTE: NO USCOE WETLANDS ON SITE.
50' VEGETATED
FILTER
PROJECT 1.
BOUNDARY/
DRAINAGE . • . . . . . .
AREA
C
/ Story Aluminum boldtng
20 0 20 40 60
PROJECT
BOUNDARY/
DRAINAGE 20'
AREA n1f
Mills Refrigeration Inc
CIO PHILLIP MILL5
E PO BOX 1043
DURGA W, NC 26425
ZONE.- B-2
DL9. 549, PG, 10
i-T
all
PROJECT
T T I
BOUNDARY/ 44 3E]UT 44
INV OL)T
DRAINAGE -1 N V U 442
AREA 54, LF
46 2 L B4
4E
01" T
1=4 NV 0UT 44.3
A
CB3
R T M 4' 3
INV III 44.4
T
;NV OIL-7 44 4
41 i?
4, 4 4Y.9
47 9
-A 5.Cy
u
42-B
473
PROP05EO
L3LDG
2 7, C5
55'X 60'
d
rvf
Stacy H. cow/
303 VANN CT
F F
DURCAW, NC 25425
40, 0
PROPERTY 628 L15
I 17 HWY
ZONE., B-2
DL3. 842, PG. 154
!NV 01LIT 44.0
� T 5 PROJECT
N 4 4 BOUNDARY/
1 N
nPATNAr.C'
'NV JT
44.0 AREA
.7 Ljlr--
PROJECT
iNV TIN 44,1
BOUNDARY/
''NV V D Lj T 44,1 DRAINAGE
; : N V T AREA
N '4 2-
!NV DIJT 442
4-�
4LL 1.
465
-4 4 17-1 J 7 N'v1 N 4 4, -3
474 V,
4 -
•
D 44.4
47.3
I \ d?.5 J I �!
A
4RI
PROJECT
BOUNDARY/
DRAINAGE
AREA
46 j
ari
AR.1
O
1�4 7
n1f
vF Norwood Covil
50/ HWY53 E
48.1 DURGAW, NC 28425
ZONE. B-2
476
47.3
05. 2162, PG. 246
481
j
47.0 a 4 �D
/a 7
4 4,
71111
4U PROJECT
48.1
BOUNDARY/
DRAINAGE
AREA
481 .11
479
AT3
L
LI
N T
48.4
4F 1!
iag Vi s3 Y-135
48.3 4t'3 492 4S.1
[4� �7q 1 3,4+,-4-1
RIM 46,6 48.3 4R;
INV IN 45.c---'47,2
INV U 4 4. r
4R.7
494
.74,
_7
5.0'
T. N E-11 U 4 t5.3
PRo 050
r
F F
BLDG
L
47.5 4Y&
4e!� 484
60' X 54 6 4&4
16
PROJECT i RETAIL
BOUNDARY/ IN j
L IMI TE19
DRAINAGE 60' x 49"' PROJECT
RE5 TA UP\14 N T BOUNDARY/
AREA
A DRAINAGE
"7j
60'x 35" AREA
47.4 485
4
-A '
=9
48.0
'W
R �111 4 7 41
ICT
j'V 7
A r::
N V '-AD
A 7.3 4 B 49.5 PROJECT
BOUNDARY/
3�" �7c! Cf-f 48.1 DRAINAGE
7Q
AREA
R-Y. 47 C�
INV CIUT45.7
� L=
48.5 49.1
�j
PROJECT L
BOUNDARY/
DRAINAGE
AREA
i2-11 47.1 N 2-04'E
Tie 49.
495
47.4 , I 100-ca .. 'i-:� 1�a
4736
47.9
OJECT
450 �-Pk hall BOUNDARY/
45-1 A36, DRAINAGE
4ti 0 --bc
-fe, -,n 4
PROJECTAREA
BOUNDARY/
DRAINAGE
AREA
MICHAEL C.
TRI-COAST PLAZA
BURGAW, NC
STORM WATER
N
r
X"
�j PROPERTIES
COASTAL
RopfRTIE5
LLC
0111
E
VICINITY MAP
5CALE.- 111 = 400'
APPROVED
NORTH CAROLINA ENVIRONMENTAL
MANAGEMENT COMMISSION
DIVISION OF WATER QUALITY
� ("; 6 c)-(o C9 2- ( I
GALLANT PEPT
MICHAEL C. GALLANT, PE,PA k
P.O. BOX 4039
SURF CITY, NC 28445
PHONE: [phone]
REVISIONS
HEET:
1 OF
-7 1 F ' �or
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'�
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I
LII I , " I I I
.
LATE: I SCALE: DRAWN BY:
2/14/2005 1 JP=2C 1
FILENAME:

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Q
VEGETATED
FILTER
DETAIL
N TS
10'
50'
rRECIEMNG
'4
WALE A
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LEVE
SPREADER
PLAN
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STRUCTURE DETAIL
NOT
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6(500,
TEMPORARY STORAGE
ALE45`
-------------
---y--,-
--
----r------
PERIIi1A Mt
Af T
r---, r--- s--'� !
FO
REBAY WIER DETAIL_
NOT TO SCALE
E
NOTES
A. F❑REBAY WIER INV 43.50
Br PERMANENT POOL ELEV. 44,00
C, 6Y RIP RAP 9' THICK WITH 3" ABC STONE AND FILTER FABRIC UNDERLAY T❑ EXTEND
TO TOE OF SLOPE BOTH SIDESr
Dr APRON WIDTH 6 FT MIN,
Er WIER WIDTH 5 FT.
P\
CK WALLS
EMENT PEAS
-H-H SECTI❑N 'B-B'
5-1t}• MiN:
5'-4'
PVMT,
r CURB & GUTTER
cr
NOTE,
PLAN 1. 4' DEEP X S' WIDE CONCRETE C❑PING
ALL AROUND BASIN CASTING.
2. ALL CONCRETE TO BE CLASS 'A'
3. FOR CASTING DETAIL SEE SD 14-03
CATCH BASIN
SD 2-0I
NOT TO SCALE
5GU � 02-( I
.r-

k. l�L..._ �', .�iri�_-•- `-. .. �! isi._ nLL-e�1,•5.t!t4;,.t±�
r11
l - 0, l2.8' So.Bf
413.6'
� so
0
�O
�c R 2'
IVY
� � o
45.9' �-
! 4.4' 9.0' /z
75.C' 4
i
65.6`
i
I 0r5'
i
5.3' Rj
O N
ol
�D O b 0 as
� D
j �"'��` w
19
1 55 # X 60# aZ d2ir
Lf��
w
� O �
o �
5.3' ,
O
� W t
.p
6' 64, 0'
�i
49.6' ac;q�q
LANDSCAPED AREA y.5
Lo
59.0' # (5-2'
o' PRO) ED
51, DG
co x 54
Li1VifTEQ RETAIL
RESTAURANT 60(X 49" O
60 X 3 5 "
Q) (56.6'
7�t 55- 01
Inh
G
c*a
N
4' -A C)
34.0Q
42.0'
uaj ri w
p � o
b
m _
41.5
NOTE:
l , ALL RADIUS AIDE V
UNLE5.5 OTHER W13E
ANNOTATED.
20 10 0 20 40
1:20 SCALE
MICHAEL C e GALLANT, PE,PA
MICHAEL C. GALLANT, PE,PA
TR I — C OAST PLAZA P.O. PDX 4039
B U R GAW, NC SURF CITY, NC 28445
PHONE: [phone] f--
R EVI S I O N S: L C•
DIMENSIONS A . s
SHEET:
3 OF 4
ATE: SCALE: DRAWN BY: FILENAME:
12/ 1 4/2005 1 :20
: +1
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ki

Pre -Development
_ - Inflow Hydrograph, 10-yr storm
Inflow Hydrograph, 50-yr storm
Runoff Coefficient, C
t < 1.25 Tc
Q (t) = Qp/2*(1-cos(pi*t/Tp))
t < 1.25 Tc
Q (t) = Qp12*(1-cos(pi*t/Tp))
Hydraulic Length, L
ft
t > 1.25 Tc
Q = 4.34*Qp*exp(-1.3*(t(Tp))
t> 1.25 Tc
Q = 4.34*Qp*exp(-1.3*(t/Tp))
Elevation Change, H
ft
Watershed Area, A
acres
Permanent Level
44.00 ft
Permanent Level
44,00 It
Time of Concentration, Tc
9.12 min
Tc = iL'`/H)o"'/128
10-yr Intensity, i
6.44 in/hr
l = 2521(30+Tc)
Riser
Length
r ft
Ctrl, Pipe
Diameter
in
Peak Outflow
0.07 cfs
Riser
Length
3.00 ft
Ctrl. Pipe
Diameter
1.04
in
Peak Outflow
2,59
cfs
50-yr Intensity, 1
8.02 in/hr
I = 338/(33+Tc)
Elevation
ft
Elevation
44.00 ft
Peak Stage
44,29 ft
Elevation
44.25 ft
Elevation
44.00
ft
Peak Stage
44.37
ft
Weir Coef.
3.00
Orif. Coef.
0.52
Weir Coef.
3.00
Orif Coef.
0.52
10-yr Flow, Qa
6.59 cfs
Q = CIA
Orif. Coef.
0.60
Q Pre -Development
5.59
Orif. Coef.
0.60
Q Pre -Development
6.96
50-yr Flow, Qa
6.96 cis
Q = CIA
Peak Inflow
9,63
Pond Bank
45,00
Pond Bank
Post -Development
Riser 2
Length
ft
Barrel
Orif. Coef
0.65
Sec Riser
Length
0.00 ft
Barrel
Orif Coef
0.65
Impervious Area
acres
Top El.
:. ft
Diameter
in
Top El.
0,00 ft
Diameter
8.00
in
Runoff Coefficient, C
0.79
Bot. El.
It
Elevation
ft
Sot. El.
0.00 ft
Elevation
42.00
ft
Hydraulic Length, L
570 ft
Weir Coef.
3.00
Number
1.00
Weir Coef.
3.00
Number
1.00
Elevation Change, H
ft
Orif. Coef.
0.60
Orif. Coef.
0.60
Area, A
1.87 acres
Time of Concentration, Tc
9.12 min
Tc = (l.21H)0"'/l28
int:
10-yr Intensity, 1
6.44 in/hr
1 = 252/(30+Tc)
Tp =
35.79
Riser 2 Riser 2
Riser
Riser
Riser Structure
Total
Tp =
39.50
Riser 2
Riser 2
Riser 2
Riser
Riser
Riser
Structure
Total
50-yr Intensity, 1
8.02 in/hr
I = 338/(33+Tc)
Time t
Qin
Storage
Stage
Ctrl Pipe
Weir
Oriface Outflow
Weir Oriface
Outflow
Total
Barrel
Outflow
Time t
Qin
Storage
Stage
Ctrl pipe
Weir
Oriface
Outflow
Weir
Oriface
Outflow
Total
Barrel
Outflow
min
cfs
cu ft
ft
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
min
cfs
cu ft
ft
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
cfs
10-yr Flow, Qp
9.63 cfs
Q = CIA
0
0.00
0.00
44.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2.35
0.00
0.00
0.00
0.00
44.00
0 00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2.35
0, 00
50-yr Flow, Qp
12.00 cfs
Q = CIA
4
0,24
0.00
44.00
0,00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2.35
0.00
3 95
0.29
0.00
44.00
0,00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2.35
0.00
7
0.92
50.60
44.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2 35
0.00
7.53
1.04
63.03
44.00
0 00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2,35
O.CO
dQ, 10 yr storm
4.04 cfs
11
1.98
248.05
44.00
O.00
0,00
0.00
0.00
0.00
0.00
0.00
0.00
2.35
0.00
11 11
2.19
287,09
44.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2.35
O.00
dQ, 50 yr storm
5.04 cfs
14
3.33
674.21
44.01
0.00
0.00
0.00
0,00
0.00
0.00
0,00
0.00
2 35
0.00
1469
3,65
757.75
44.01
0,00
0.00
0.00
0,00
0.00
0.00
0.00
0.00
2.35
O.00
18
4.81
1388.56
44.01
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2,36
0.00
1826
5.29
1540.75
44.02
000
0.00
0.00
0,00
0.00
0.00
0.00
0,00
2,36
0.00
10 yr Required Storage
1.21E+04 cu It
S = dQ*Tc*1.39*60
21
6.30
2422.33
44.03
0.00
0.00
0.00
C.00
0,00
0.00
0.00
0.00
2.36
0.00
2184
6.99
2676,69
44,03
O.CO
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2.37
O.00
50 yr Required Storage
1.66E+04 cu ft
S = dQ*Tc*1.39*60
25
7.65
3775.48
44.04
0,00
0.00
0.00
0.00
0.00
0.00
0,00
0.00
2 37
0.00
25.42
8,61
4177.71
44.04
0,00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
2.38
O.CO
29
8.71
5416.69
44,06
0.00
0.00
0.00
C.00
0.00
0.00
0.00
0.00
2.39
0.00
29 00
10.02
6026.60
44.06
0.00
0.00
0,00
0,00
0.00
0.00
0,00
0.00
2.39
O.00
Time to Peak
32
9.39
7286.38
44.08
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
240
0.00
32.58
11.11
8178.09
44.08
000
0.00
0.00
0,00
0.00
0.00
0,00
0.00
2,41
0.00
10-yr Storm Depth (P)
4.80 in
6 hr runoff
36
9.63
9302.61
44.10
0.01
0.00
0.00
C.00
0.00
0.00
0.00
0.01
2.41
0.01
36.16
11.79
10562.66
44,11
0.01
0.00
0.00
0,00
0.00
0.00
0.00
0.01
Z42
O.C1
50-yr storm depth (P)
640 in
6 hr runoff
39
9,39
11369.16
44.12
0.01
0.00
O.00
0.00
0.00
0.00
0.00
0.01
243
0,01
39.74
12.00
13091.81
44.13
O.C1
0.00
0.00
0.00
0.00
0.00
0.00
0.01
2.44
0,01
Soil Curve Number (CN)
43
8.71
13384.91
44.14
0.01
0,00
0.00
C.00
0.00
0.00
0.00
0.01
2A4
0.01
4332
11.72
15665.90
44.16
O C1
0.00
0.00
0.00
0.00
0.00
0.00
0.01
2.46
0.01
SCS Curve Number (CN)
95
47
7,71
15253.65
44.16
0.01
0.00
0.00
0.00
0.00
0.00
0.00
0.01
2,45
0.01
46 89
10.99
18181.25
44.18
0.01
0,00
0.00
0,00
0.00
0.00
0.00
0.01
247
O.C1
Soil Storage Capacity (S)
0.51
S = 1 OOO/CN - 10
50
6,77
16907.84
44.17
0.01
0.00
0.00
0.00
0.00
0.00
0.00
0.01
2.47
0.01
5047
9,89
20538.98
44.21
0.01
0.00
0.00
0,00
0.00
0.00
0.00
0.01
2,49
0.01
10-yr Runoff Depth (Q*)
4.23 in
Q* = [(P-O.2*S)]"2/(P + 0.8*S)
54
5.95
18360.06
44.19
0.01
0.00
0.00
0.00
0.00
0.00
0.00
0,01
2.47
0.01
54.05
8.79
22660.36
44.23
0,01
0.00
0.00
0.00
0.00
0.00
0.00
0.01
2.50
0,01
10-yr Runoff Volume (V)
28741 cu ft
V = Q*A
57
5.22
19634.93
44.20
0.01
0,00
0.00
0.00
0.00
0.00
0,00
0.01
248
0.01
57.63
7.81
24545.69
44.25
0.01
0.00
0.00
0.00
0.00
0.00
0.00
0.01
2.52
0.01
50-yr Runoff Depth (Q*)
5.82 in
Q* = [(P-0.2*S)],,2/(P + 0.8*8)
61
4.58
20754.09
44.21
0.01
0.00
0.00
0.00
0.00
0.00
0.00
0.01
2.49
0.01
61 21
6,95
26221.23
44.26
0.01
0.00
0.00
0.00
0.02
1.75
0.02
0,03
2.53
0.03
50-yr Runoff Volume (V)
39521 cu ft
V = Q*A
64
4,03
21736.52
44.22
0.01
0.00
O.00
0.00
0.00
0.00
0,00
0.01
2 50
0.01
64,79
6.17
27706.83
44.28
0.01
0.00
0.00
0,00
0.05
2.48
0.05
0.06
2.54
0.06
68
3.54
22598.88
44.23
0.01
0.00
0.00
0.00
O. DO
0.00
0.00
0.01
2.50
0.01
68.37
5.49
29020.37
44.29
0, 01
0.00
0.00
0.00
0.08
2.97
0.08
0.09
2.54
0.09
10-yr Time to Peak (Tp)
35.79 min
Tp = V/1.39Qp
72
3.10
23355.81
44.24
0.01
0,00
O.DO
0.00
0.00
0.00
0.00
0,01
2.51
0.01
71 94
4,88
30179.44
44.30
0.01
0,00
0,00
0,00
0.11
3,35
0.11
0.12
2.55
0.12
50-yr Time to Peak (Tp)
39.50 min
Tp = V11.39Qp
75
2,73
24020.17
44.24
0.01
0.00
O.DC
0.00
0.00
0.00
0.00
0.01
2.51
0.01
75.52
4.34
31200,27
44.31
0.01
0.00
0.00
0,00
0.15
3.65
0.15
0.16
2,56
0.16
79
2. 39
24603.25
44.25
0.01
0.00
0,00
0.00
0,00
0.00
0.00
0.01
2.52
0.01
79.10
3.85
32097.59
44.32
0,01
0.00
0.00
O.00
0.18
3.90
0.18
0.19
Z 56
0.19
Stage Storage Function
82
2,10
25114.94
44.25
0.01
0.00
000
0.00
0,00
0.89
0.00
0.01
2.52
0.01
82.68
3.43
32884.71
44.33
0.01
0.00
0.00
0,00
0.21
4.10
0.21
0.22
2,57
0.22
Permanent Pond Level
" .: ft
86
1,85
25563.52
44.26
0.01
0.00
0.00
0.00
0.01
1.31
0.01
0.02
2.52
0.02
86.26
3.05
33573.63
44.34
0.01
0.00
0.00
0.00
0.23
4.27
0.23
0.24
2.57
0.24
S Z
89
1.62
25956.07
44,26
0.01
0,00
&OD
0.00
0.01
1.59
0.01
0.02
2.52
0.02
89.84
2.71
34175.08
44.34
0.01
0.00
0.00
0,00
0.26
4.41
0.26
0.27
2.58
0.27
CONTOUR INCR
ACCUM
93
1.42
26299.16
44,27
0.01
0.00
0.00
0.00
0.02
1.80
0.02
0.03
2.53
0.03
9342
2.41
34698.70
44,35
0.01
0.00
0.00
0,00
0.28
4,53
0.28
0.29
2.58
0.29
CONTOUR
AREA VOL
VOL STAGE In S
In Z Zest 97
1.25
26598.66
44.27
0.01
0.00
0.00
0.00
0.02
1.96
0.02
0.03
2.53
0.03
9699
2.14
35153.08
44.35
0.01
0.00
0.00
0,00
0.30
4.63
0,30
0.31
2.58
0.31
[sq ft] cu ft
cu ft ft
100
1.10
2685978
44.27
0.01
0.00
0.00
0.00
0.03
2.10
0.03
0.04
2,53
0.04
10057
1.90
35545.92
44.36
0.01
0.00
0.00
0,00
0.31
4.72
0.31
0,33
2,59
0.33
104
0.96
27087,13
44.27
0,01
0.00
0.00
0.00
0.03
2.20
0.03
0.04
2.53
0.04
104.15
1.69
35884.09
44.36
0.01
0.00
0.00
0.00
0.33
4.79
0.33
0.34
2.59
0.34
44.00
0
0 0,00 0.0000
0.0000 0.0000 107
0.85
27284.78
4428
0.01
0.00
0.00
0,00
0.04
2.29
0,04
0.05
2.53
0.05
107.73
1.50
36173.71
44.36
0.01
0.00
0.00
0,00
0.34
4.85
0.34
0.35
2.59
0.35
45,00
4,627
4,627 1.00 8,4397
0.0000 0.0483 ill
0,74
27456.32
44.28
0.01
0.00
0.00
0.00
0.04
2,37
0.04
0.05
2.53
0.05
111 31
1.34
36420.24
44.37
0.01
0.00
0.00
0.00
0.35
4.91
0.35
0.37
2.59
0.37
4600
6,027
10,654 1.00 9.2737
0.0000 0.1095 115
0,65
27604.91
44.28
0.01
0.00
0.00
0.00
0.04
2.43
0.04
0.05
2.54
0.05
114.89
1.19
36628.54
44.37
0.01
0.00
0.00
0.00
0.36
4.95
0.36
0.37
2,59
0.37
47.00
7,037
17,690 3.00 9.7808
1.0986 0.1800 118
0.57
27733.35
44.28
0.01
0.00
0.00
0.00
0.05
2A9
0.05
0.06
2.54
0.06
11847
1.06
36802.95
44.37
0,01
0.00
0.00
0.00
0.37
4.98
0.37
0.38
2.59
0.38
48.00
3,544
21,235 4.00 9,9634
1.3863 0.2153 122
0.50
27844.07
4428
0.01
0.00
0.00
0.00
0.05
2.53
0.05
0.06
2.54
0.06
12205
0.94
35947.33
44.37
0.01
0.00
0.00
000
0.38
5.01
0.38
0.39
2.59
0.39
125
0.44
27939.25
44.28
0.01
0.00
0.00
0.00
0.05
2.57
0.05
0.06
2.54
0.06
b
b = [In (S2/S,)]/[In (Z214)1
129
0,39
28020.77
44,28
0.01
Q00
0,00
0.00
0.05
2.60
0.05
0.06
2.54
0.06
Ks
:: =: °:
KS = Sz/Z2b
132
0.34
28090.32
44.28
0.01
0.00
0.00
0,00
0.05
2.63
0.05
007
2.54
0.07
136
0.30
28149.34
44.28
0.01
0.00
0.00
0,00
0,06
2.66
0.06
0.07
2.54
0.07
Peak Discharge (Wls)
140
0.26
28199.14
44.28
0.01
0.00
0.00
0.00
0.06
2.67
0.06
0.07
2.54
0.07
143
0.23
28240 85
44,28
0,01
0.00
0.00
0,00
0.06
2.69
0.06
0,07
2.54
0.07
Pre -Development Post -Development
147
020
2827546
44.29
0.01
0.00
0,00
0.00
0.06
2.70
0.06
0.07
2.54
0.07
City
Consultant City Consultant
150
0.18
28303.85
44.29
0.01
0.00
0.00
0.00
0.06
2.71
0.06
0.07
2,54
0.07
10 yr 5,59
9.63
154
0.16
28326, 79
44.29
O. 01
0.00
0.00
0,00
0.06
2.72
0.06
0.07
2.54
0.07
50 yr 6.96
12,00
157
0,14
28344. 95
44.29
001
0.00
0.00
0.00
0,06
2.73
0.06
0.07
2.54
0.07
161
0.12
2835893
44.29
0.01
0.00
0.00
0.00
0.06
2.74
0.06
0.07
2,54
0.07
165
0.11
28369.24
44.29
0.01
0.00
0.00
0.00
0.06
2.74
0.06
0.07
2.54
0.07
168
0.09
28376.34
44.29
0.01
0.00
0.00
0.00
0.06
2.74
0.06
0.07
2.54
0,07
172
0.08
2838C,64
44.29
0,01
0.00
0.00
0.00
0.06
2.74
0.06
0.07
2.54
0.07
D CALCULATIONS
DRAINAGE AREA
PERCENT IMPERVIOUS
3 FOOT DEEP POND 85% TSS
SA/DA
MINIMUM REQUIRED SURFACE
AREA AT PERM POOL
=.0510 X 1.87 X 43560
SURFACE AREA PROVIDED AT
PERMANENT POOL
MINIMUM REQUIRED VOLUME
SIMPLE METHOD
Rv = .05 +_009(68.0)
TEMP VOLUME REQUIRED
= 0"/l2")X.662X1.87X4356O
SURFACE AREA PROVIDED
AT PP
STORGE ELE ABOVE PP
= 5068/4185 (USE V)
SURFACE AREA AT 45 FT
TEMP VOLUME PROVIDED
=(5068+4185)/2 X (45-44)
1.87 ACRES
68 %
5.1 %
4154 SF
4185 SF
0,662
4494 CU FT
4185 SF
45 FT
5068 SF
4626.5 CU FT
FORE BAY VOLUME
PP VOLUME
FOREBAY VOL
REQUIRED=.2(6877)
FORE BAY VOL
PROVIDED (3' DEEP)
ORIFICE SIZING
Q2=4494/172800
Q5=4494/432000
CHOOSE A 1" CIRCULAR
ORIFICE
AVERAGE HEAD
= (1'-(.5)(2`712)I/2
AREA
Q=CdA(SQ RT(2gh)
.010<. 022<.026
5099 CU FT
1019.8 CU FT
1227 CU FT
0,026 CFS
0.010 CFS
1"
0.729167 FT
0.005451 SF
0.022414 CFS
PERMANENT POOL VOLUME (SUM OF THE VOLUMES OF THE FOREBAY AND POND BELOW THE PP LEVEL)
ADDITION OF THE VOLUMES FOR THE FRUSTRUM OF TWO PYRAMIDS
V=113H(B +SQRT(B*B'O +B')
H= 3 FT
FOR THE POND B=
2889
SQ FT
B'=
208
SQ FT
V=
3872
CU FT
H= 3 FT
FOR THE FOREBAY B=
9,51
SQ FT
B'=
49
SQ FT
V=
PERMANENT POOL VOLUME=
MICHAEL C GALLANT, PE, PA
PO BOX 4039
SURF CITY, NC
28445
WET DETENTION CALCULATIONS
ATLANTIC PLAZA
1227 CU FT
5099