20070218 Ver 1_Stormwater Info_20070727

' 0'~ -pal 8
WATERSHED DEVELOPMENT,
STORMWATER,
AND
EROSION CONTROL CALCULATIONS
FOR
ALEXANDRIA PARK APARTMENTS
NC HWY 68 & WHITES MILL ROAD -
HIGH POINT, NORTH CAROLINA
DEVELOPER/ OWNER:
Blue Ridge Companies, Inc.
5826 Samet Drive
k@
/p'.~lyyk
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Suite 105 ~~ ~~'~~ ~`
~~ t~. , ~~ y, ~~
High Point, North Carolina 27265 <~ ,~ 200 ~
[phone]
'ti~.~Ey - VNAT~R Ql3/tlll~'
l~Tlt~riC~+= Jv~'D ~T4?.'~.°'A~EP BRANCH
CPT Engineering and Surveying, Inc.
3935 Brian Jordan Place -Suite 137 • High. Point, NC 27265 • Phone [phone] • Fax [phone]

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SITE LOCATION
USGS MAP
SOILS SURVEY MAP

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=.J: U865 QUAD MAPS
:GUILFORD, N.G.
r~~/ISi=D laa4
~~;vD of la2a
E: NG I NE~RI NG AND 5UR1/3=Y I NG, I NG . ~LEX~NI~R1 A~ P,~RK ~P~R'rNIENTS
i LAND L~E1/EI.OPMENT GONSULTIN6
U5G5 M,4P
4{00 1'YNIN6 STREET 6U I LFORD GOUNTY, NG
HI6Ft POINT, NORTH CAROLINA 2'1263
"BONE, (596) 8I2-8800 ~ FAX, (336) 812-8T80 SGAL-Ci I " _ X000'

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ENGINEERING AND SUR~/EYING, ING. r~LEX~rN17RI~ PARK ~PA~RTM~NTS
_j; LAND DEVELOPMENT GONSULTINcS
. ~ ~ SOIL SUR~/EY M,4P
4aoo T`fNINb STREET 6UILFORI7 GOUNTY, NG
HIGH POINT, NORTH CAROLINA 2'1265
PHONE. [phone] ~ FAX. [phone]'180 SG~41.=: I "=1000'

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STORM DRAINAGE
CALCULATIONS

CPT En ineerin and Surve 'n Inc.
g g n g~
3935 Brian Jordan Place, Suite 137
High Point, N.C. 27265
TABLE 1. INPUT
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Location: Hi h Poin t, North Carolina
Duration: 2 yr
in 100 yr
in Source
5 min 0.47 0.82 NOAH H dro 35
15 min 0.92 1.71 NOAH H dro 35
60 min 1.59 3.30 NOAH H dro 35
24 hr 3.50 7,50 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY
Duration
H-1 * 2 yr
in 5 yr
in 10 yr
in 25 yr
in 50 yr
in 100 yr
in
5 min " 0.47 0.54 0.60 0.69 0.75 0.82
10 min 0.74 0.87 0.97 1.12 1.23 1.35
15 min * 0.92 1.10 1.22 1.41 1.56 1.71
30 min 1.25 1.53 1.74 2.03 2.26 2.49
60 min * 1.59 1.99 2.27 2.67 2.99 3.30
2 hr * 1.80 2.26 2.58 3.04 3.40 3.76
3 hr * 2.01 2.53 2.89 3.41 3.82 4.22
6 hr 2.55 3.22 3.69 4.36 4.88 5.40
12 hr "` 3.02 3.83 4.40 5.20 5.83 6.45
24 hr * 3.50 4.44 5.10 6.04 6.77 7.50
1-rom tqs. lll-(7-3), p.lll-(4-5J, Stom7water Management: Vol.l
Urban Hydrology. 8. H. Bradford, N. S. Grigg, L.S. Tucker
TABLE 3. INTENSITY -DURATION -FREQUENCY
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Duration 2 yr
in/hr 5 yr
in/hr 10 yr
in/hr 25 yr
in/hr 50 yr
in/hr 100 yr
(in/hr
5 min 5.64 6.54 7.22 8.24 9.04 9.84
10 min 4.41 5.22 5.81 6.69 7.38 8.07
15 min 3.68 4.38 4.90 5.65 6.25 6.84
30 min 2.50 3.07 3.47 4.06 4.52 4.98
60 min 1.59 1.99 2.27 2.67 2.99 3.30
2 hr 0.90 1.13 1.29 1.52 1.70 1.88
3 hr 0.67 0.84 0.96 1.14 1.27 1.41
6 hr 0.42 0.54 0.61 0.73 0.81 0.90
12 hr 0.25 0.32 0,37 0.43 0.49 0.54
24 hr 0.15 0.19 0.21 0.25 0.28 0.31
Intensity =Depth /Time
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Storm Drainar¢e Desiiaa Data Sheet
Pipe-Sizing Table for Conventional Method
Project Alexandria Park Apartments
Location: High Point, N.C.
Storm Frequency: 10___ .Year
Description: Storm Drainage Drnin;ng to Wet Detention Pond # 1
Computed 13y: STW Date: 11/29/06
Checked 13y: Revised: 1/ 19/07
Lo cation Ar ea Tc C Intensity Q=CIA n Pi Dtheo Size Vfull I
I I

From
To
Sub
Total
min
in hr
cfs
Slo
Le .
in
in
ft sec nv.
n nv. Out
ft HW/D
CB # 1 EX SDMH 0.25 0.25 5.00 0.80 7.22 1.44 0.013 0.0630 11 6.05 15 13.19 --- 879
3 0
54
EX SDMH SDMH #2 --- 0.25 5.00 0.80 7.22 1.44 0.013 0.0560 219 6.19 IS 14.05 --- .
878
4 .
<0
50
SDMH #2 C[ #3 --- 0.25 5.00 0.80 7.22 1.44 0.013 0.0670 15 5.98 18 15.37 866.1 (EX 18" RCP) .
865.3 .
<0
50
CI #3 Ct #5 0.24 0.49 5.00 0.80 7.22 2.83 0.013 0.0100 31 11.00 18 5.94 864.3 864.1 .
0.61
DI #4 CI #5 1.36 1.36 5.00 0.80 7.22 7.86 0.013 0.0100 39 16.13 18 5.94 --- 864
2 1
20
Ci #5 CB #6 0.25 2.10 5.00 0.80 7.22 12.13 0.013 0.0320 56 15.26 24 12.86 863.8 (C[ #3) .
863.3 .
0.98

CB #6
CB #8
0.07
2.17
5.00
0.80
7.22
12.53
0.013
0.0050
138
21.88
24
5.09 863.8 (D] #4)
861.5
861.0
0.99
YD #7 CB #6 0.14 0.14 5.00 0.80 7.22 0.81 0.013 0.0100 49 6.87 8 3.46 --- 863
5
CB #8 CB #10 0.30 2-61 5.00 0.80 7.22 15.08 0.013 0.0050 90 23.45 30 5.90 860.3 (CB #6) ,
859.8 0.76

DI #9
CB #10
0.28
0.28
5.00
0.80
7.22
1.62
0.013
0.0190
112
7.90
15
7.25 863.0 (YD #7)
---
865
5
0
57
CH #10 CB #14 0.44 3.33 5.00 0.80 7.22 19.23 0.013 0.0050 199 25.69 30 5.90 859.3 (CB #8) .
859.1 .
0.90

DI # 11
DI # 12
0.76
0.7b
5.00
0.80
7.22
4.39
0.013
0.0840
57
8.70
I S
15.24 863.4 (DI #9)
---
869
5
1
08
DI # 12 CB # 14 0.52 1.28 5.00 0.80 7.22 7.39 0.013 0.0100 186 15.76 18 5.94 864.7 .
864.5 .
1.14
YD #13 CB #14 0.10 0.10 5.00 0.80 7.22 0.58 0.013 0.0110 35 5.95 8 3.63 --- 863
7
CB #14 CB #17 0.55 5.26 5.00 0.80 7.22 30.38 0.013 0.0050 187 30.50 36 6.66 858.1 (CB #10) .
857.6 0.90
862.6 (DI # 12)

DI # I S
CB # 16
0.26
0.26
5.00
0.80
7.22
1.50
0.013
0.0100
87
8.67
15
5.26 863.3 (YD # 13)
---
862.4
54
0
CB # 16 CB # 17 0.21 0.47 5.00 0.80 7.22 2.71 0.013 0.0100 60 10.83 15 5.26 861.5 861
3 .
78
0
CB # 17 CB #27 0.47 6.20 5.00 0.80 7.22 35.81 0.013 0.0060 50 31.35 36 7.30 856.6 (CB #14) .
856.4 .
1.01
860.7 (CB # 16)
YD # 18 CB # 19 0.12 0.12 5.00 0.80 7.22 0.69 0.013 0.0110 114 6.37 8 3.63 --- 863.5
CB # 19 CB #22 0.38 0.50 5.00 0.80 7.22 2.89 0.013 0.0160 56 10.15 15 6.65 862.2 861.6 0.80
YD #20 DI #21 0.13 0.13 5.00 0.80 7.22 0.75 0.013 0.0100 154 6.69 8 3.46 --- 862
9
DI #21 CH #22 0.16 0.29 5.00 0.80 7.22 1.66 0.013 0.0100 95 9.03 15 5.26 861.3 .
860.7 0
58
CH #22 CB #23 0.34 1.13 5.00 0.80 7.22 6.53 0.013 0.0110 17 14.78 16 6.23 860.7 (CB #19) 859.5 .
1.03
859.7 (DI #21)
CB #23 CB #26 0.18 1.31 5.00 0.80 7.22 7.57 0.013 0.0100 121 15.90 18 5.94 859.3 859.1 1.16
YD #24 DI #25 0.17 0.17 5.00 0.80 7.22 0.98 0.013 0.0100 89 7.39 8 3.46 --- 861
8 ---
DI #25 CB #26 0.06 0.23 5.00 0.80 7.22 1.33 0.013 0.0100 64 8.28 15 5.26 860.9 .
860
3 0
52
CB #26 CB #27 0.32 1.86 5.00 0.80 7.22 10.74 0.013 0.0060 125 19.96 24 5.57 857.9 (CH #23) .
657.4 .
0.88

CB #27
CB #30
0.33
8.39
5.00
0.80
7.22
48.46
0.013
0.0050
144
36.33
36
6.66 859.6 (DI #25)
856.1 (CB #17)
855.9
1.29
856.7 (CB #26)
DI #28 DI #29 0.11 0.11 5.00 0.80 7.22 0.64 0.013 0.0300 100 5.11 15 9.11 --- 861.2 <0
50
DI #29 CB #30 0.19 0.30 5.00 0.80 7.22 1.73 0.013 0.0100 85 9.15 15 5.26 858.2 858.0 .
0.59
CH #30 FES #31 0.43 9.12 5.00 0.80 7.22 52.68 0.013 0.0100 58 32.92 36 9.42 555.1 (CH #27) 847.6 1.40
857.1 (DI #29)
CPT Engineering and Surveying, Inc.
Page I

Description: Slorm Drainage Drauting to Wet. Detcrnion Pond ;L
Location Area Tc L Intensip~ Q=CIA n Pix~ Dtheo. Size Vfull Im~. [n Inc. Out HR'/D
from To Sub Total min ut iv cfs Slox Lcn tb in in ft'ser Yt ft
CI X32 EXYI 0.07 0.07 5.00 0.80 7.22 0.30 0.0;3 Q_0830 30 3.56 15 ;S.la --- 87Q5 <0,50
DI #33 DI 433 0.22 0.22 5.00 0-80 7.22 1.27 ,1.013 0.0100 150 8-13 IS 526 -- HG39 0.50
DI 434 CB n35 0.13 0.35 5.09 0.80 -.22 2.02 ~ 0.013 O.OlpO 5~+ 9.69 .- 5.25 9li2.a 362.2 0.65
CP3 #35 C. E3 439 Q.OI 0.36 5.00 0.80 9.12 Z.OS 6.013 0.0100 1a4 9.80 15~ 5.26 861.6 E361.a O.Gli
YD~36 CH~+39 0.03 Q.0.3 5,(10 0.80 7.22 0.17 0.01.3 O.Q1G0 i10 3.53 6- 3.67 -- 863.5 ---
CI X37 Ci 438 0.63 0.63 5.00 0.80 7.22 3.l~- 0.013 QO100 30 12.08 0 5.26 --- R6 LO 0 95 I
CI #38 CH #39 0.53 ].1G 5,00 0.80 7.22 6,70 0.013 0.0100 l33 15.14 18 5.44 860.7 860.5 1 OS
CF3 439 DI #40 0.39 2.04 5-00 0.80 722 1 t.78 0.013 0,00.50 .57 21.38 1i 5.04 4~9 9 ICB 4:351 858.6 0.93
~ FG "' Il'D ~3Gi
8~~> 1 iCl x381
DI 440 CB 446 0.14 2.18 5.00 0.80 7.22 12.59 0.013 0.0050 is 21.92 2~ 5.09 B57.~9 857.5 i.00
CH x'} 1 CE3 x42 0.20 0.20 5-00 0.80 Z22 L ! G 0.013 0.0150 HS 7.28 15 6.a4 -- 867.6 <p.50
CH X32 CB 446 0.73 Q93 5.00 0.80 7.22 5.37 Q.0!3 O.Oi90 129 12.66 15 fi.85 860.3 860.1 i24
YD 4:3 CH 446 0.03 O.D3 5.00 0.80 7.22 0.1 i 0-0t3 0.0100 99 3-F](i ti 2.85 -- 8(i[L7 --~
CB 44a CE3 #45 0.15 0.15 5.00 0.80 722 0.87 0.013 CLO100 50 7.05 i5 526 --- 853.ti 10.50
CH'+35 CH 436 Q02 0.17 5.00 0.80 ,.22 0.48 0.013 0.0]00 5- 7.39 15 5.26 853.1 852.9 <O.SE1
CB 446 DI x47 0.37 3.68 5.00 0.80 7.22 21.26 0.013 0.0050 '.90 26.67 30 590 8572 iUt 5401 951.; 0.47
~R57.9 ECE3 442!
859.7 i~~Il =131
852..3 (CH *45';
DI 4?7 CB 44ES O.I7 3.85 S.OC1 0.80 7.22 22.23 0.013 O.OOfiO Gr 16.22 :30 6.45 850.: SSQO L02
CA 448 CB #56 0.36 4.21 5.00 0.80 7.22 24.32 O.Oi3 0.0050 i87 28.05 30 5.90 8-19.6 849.5 1.09
CB #49 DI #50 0.34 Q33 5.00 0.80 7.22 1.96 O.Oi3 O.OIC)p 4c7 9.59 IS 5.26 -- 86 L3 O.fi3
DI 450 DI #51 0.17 0.51 5.00 0.80 7.22 2.95 Q013 0.0100 135 11.15 15 5.26 860.8 860.6 0$ 1
DI 451 CH #52 0.13 0.63 5.00 0.80 7.22 3.70 0.013 QO]00 1'23 t2.16 15 5.26 RS'?2 h.59.0 OAfi
CH 452 CH #53 0.13 0.78 5.00 0.80 Z22 iS l 0.013 0.0120 i05 12.65 I5 5.76 857.7 857.5 1.12
CB #53 CB #56 O.Gi 1.39 5.00 0.80 7.22 8.03 0.013 0.0330 i IS 13.00 18 10.78 856.1 8553 1.2-3

EX CI
CB 453
3.04
3.03
5.00
0.80
7.22
17.56
0.013
0.0270
15
18.10
2i l
' i 1,e2
850.7
850.6
i.30
CH #S4 CH #55 --- .3.04 5.00 0.80 7.22 17.16 0.013 0.0090 21 2223 24 ti.82 850.2 850.0 1.30
CH #55 CH a5G 0.08 3.1'2 5.00 O.RO 7.22 18.02 0.013 0.0060 54 23-23 30 6.36 839.8 849.3 0.86
CB 456 DI 457 0.31 9.03 5.00 0.80 7.22 52.16 0.013 0.0050 15 31.35 Sri 6.66 84$.5 ICH ~a81 838.0 L30
851.1 1CI3 4531
~ 849.0 ICH ~SSi
Df 457 DI #58 0.06 9.09 5.00 0.80 722 52.50 0.013 0.0050 90 37.13 3G 6.66 837.9 837.8 t.40
D( #58 "r ES q59 0.04 9.13 5.00 0.8(1 7.22 52.73 0.013 I).0060 31 36.24 3fi '..30 847.3 tia9.2 1.40
Description: Off-site drainage from I,ot 3 (PB 97 Pf 109) and Lot X ichurch propertc) to b}--pass site
Location Area Tc C Intensin~ Q=CSA n Pi Dtlleo. Size VftIl] fnv. In ]nv. t:)ut EfW'/ll
From To Sub Total min in hr cCs Slo Len th in in ft'sec Ct Ct
Dl #60 SDMH #61 2.03 2.03 5.00 0.80 7.22 11.73 0.013 0.0120 34 i8. i 1 24 Z88 861.3 (EX I8` RCPj 859.3 0.93
SL)ME9 #61 FES #62 4.79 6.82 5.00 0.80 72'2 39.39 0.013 O.Ot 10 73 ":9.00 36 9.88 858.9 IDI aGp) 85ti.8 L09
8f>n.5 Ib'X 30' KCPI
CE'? E: r.Gincering and Surti~el~ing, ]nc. 1':-~~e 1

~ .~ ~ ~ ~ . ~ ~ +~ ~ ~ ~ ~ w ~r ~ ~ ~ ~
Description: Culvert under private drive
Location Area Tc C Intensity Q=CIA n 1?i Dtheo. Size Vfull Inv. In lnv.0ut HW/D
From To Sub Total min in hr cfs Slo in in ft sec ft ft
Inlet Outlet 8.26 8.26 5.00 0.80 7.22 47.71 0:013 0.0110 53 31.16 36 9.88 845.0 844.4 1.30
Description: Off-site drainage from the north aide of Whites Mill Road to by-pass site

Lo cation Ar ea Tc C Intensity QaCIA n Pi Dtheo_ Size Vfull Inv.ln Inv. Out HW/D
From To Sub Total min in hr cfs Slo Len in in ft sec ft ft
SDMH #63
SDMH #64
SDMH #65 SDMH #64
SDMH #65
FES #66 8.90
---
--- 8.90
8.90
8.90 5.00
5.00
5.00 0.80
0.80
0_SO 7.22
7.22
7.22 51.41
51.41
51.41 0.013
0.013
0.013 0.0050
0.0050
0.0060 60
233
50 37.15
37.15
35.90 36
36
36 6.66
6.66
7.30 847.6
845.7
844.4 846.0
845.6
844.3 1.40
1.40
1.40
CPT Engineering and Surveying, tnc.
Page 3

e
(eo )o,~
168 8,000 EXAMPLE (~~ (2) (3)
6.
1'SB 6,000 D•K IscM~ (3.S tsat)
b ~~ Q• t2O N• 3.
144
4.~0 li1Y ; Nx 6.
1'J2 D tsM
4.
3,000 (I) i.s •.s S.
12o a) :.( ~.4
2'°00 (31 i.i ~.~ ••-
los
'0 -. 1ar
96 (~ 3.
800
--
84
600 /
~
500 ~
T2 400 ~ ~ Y.
rn '~,/ 3
_ 300 E~j ~.
= N ~ ~
60 v 200 ~ ~ ' l.S
z Z / W
Q 84 ~ ~
O
~ ~ (~ 100 Z
J 4d ~ ~ QO

Q =

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~ 4g ~ 60
SO a
~
~ o H W
E ENTRANCE
CA ( 0
~ 4o S
L
p TYPE W
-W' 36 30 (I) sd••r• sdp rlt~ ~
~ AssdNl( 3 .9
~ a
~t 33
YO
ti) prsow sM rite
W
~ 30 AN8rs11 S
(3) Orso.s ssd •8
~T ~nJectiq
10
t4 >s .T
Q Te sss scsls 1i) sr (3) -rsjset
2 i s Aorissatslly to Icals (i),tAss
` ss• sirel~~t IselfnN Iles tArw/A
0 ssd 0 scslst, sr rsveras st
3 ill•atrstN.
18
P
IS
r.o
3.
S.
4.
3.
>`.-~ 2-

1.0 I.0
.9 9
•a .8
..T .T
.6 .6
L `•s --.s
.s
~ IY NEADWQTER DEPTH FAR
HEADWATER SCALES 2b3 CONCRETE PIPE CULVERTS
R~vlsEO MAY 1964 WITH INLET CONTROL
WREAV Oi ~V~UC ROAOf JAIL Np
St~srzrt ~•~~ atc~x• •;'er•t•~~~c~s~

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EROSION CONTROL CALCULATIONS
SEDIMENT BASIN DESIGN
OUTLET PROTECTION

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w
Sediment Basin Design
Project: Alexandria Park Apartments Computed By: STW
Location: High Point, N.C. Checked By: STW
Developer. Blue Ridge Companies, Inc.
Design Criteria: Settling Efficiency Criteria:
Design Storm 10 yr Design Storm
Rational Runoff Coef£ 0.50 Rationa! Runoff Coeff. _
Intensity 5.81 in/hr (Tc= 10 min.) Intensity
Weir Coefficient 2.5
Height Over Weir 1 ft
Date: 12/15/06
Revised: 02/05/07
10 yr
0.50
5.81 in/hr (I'c= 10 min.)
Bottom Bottom Top Top Side- Weir
Basin Drainage Denuded Sediment Basin Width Length Depth Width Length slope Length
Number Area (Acres) Area (Acres) Volume ft. ft. ft. ft. ft. ft.
R aired Provided
1 3.44 3.44 12,384 13,589 See Grading Plan 3 See Grading Plan 2 5
2 4.38 4.38 15,768 17,609 See Grading Plan 3 See Grading Plan 2 5
3 7.70 7.32 26,352 27,417 See Grading Plan 3 See Grading Plan 2 9
10-year Bottom Bottom Top Top Side-
Basin Drainage Peak Inflow Surface Area Width Length Depth Width Length slope
Number Area (Acres) (cfs) S . ft. ft. ft. ft. ft. ft.
Re aired Provided
1 3.44 9.99 4,347 5,467 See Grading Plan 3 See Grading Plan 2
2 4.38 12.72 5,535 7,251 See Grading Plan 3 See Grading Plan 2
3 7.70 22.37 9,730 12,736 See Grading Plan 3 See Grading Plan 2
Basin # Elevation Area
s Volume
c Total
Volume c
1 850 3,621
852 4,823 8,444
853 5,467 5,145 13,589
2 849 4,546
850 5,390 4,968
852 7,251 12,641 17,609
3 646 5,048
848 10,667 15,715
849 12,736 11,702 27,417

FMS ~ 31 ' (3Z •~ RcP,
e
'
W L Zo
OrptRo~1 ~.tS.jCt
/~./.vt~~cut t '~' x ~3'
~
~
K
L
/~4
~
~~
QQ
''
S ( r~'-~
1
1
1
1
1~
1
1
1
1
50' 100
Discharge (ft3/sec)
~o = s z. `8 ~s
a~
2 N
Cn
Q
(>3
a.
0
1 -o
. ~~so,~'
:1-1 0
1000
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
~.
!~
Rev. 1203
8.06.3
30
Outlet IW . po + La
diameter (f7e)
Pepe 1
ilwater < 0.5Do

`ti~~ . 7
~`~a~ ~l
t°
`r °~ Pp 601 f
r9 I I i '
~~e 4 j~ i_I tt !~ ~ ``
~~~\~~ ~ rt ~ol~~ill~i}tl ~i~ ~ Irill, ~I~ ~1
Appendices

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1
1
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~:~
1
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~.., ~.~..-4~-c ~ Zo.
eapaaJ v~~n-at = 9'x 23'
pcptiaJ '~+.Et c.ac_..,tE:tt S ~ t L
~~~ I R.~PW~P
3 0
Outlet IW - po + La
diameter (Do)
p'pe 1
T ilwater < 0.5Do

ti~l ~a -•
rah P 60 .
1 .._._ f
20 50 100 200 500
Discharge (ft3lsec)
4~. • sZ.73 cK
m
2 N
U)
Q
(~
d
O
1 -o
dso' 0.1.~
.moo
1000
Curves may not be extrapolated.
Figure II.O6a Design of oullot protection protection from a round pipe (lowing full, minimum tailwaler condition (TW < 0.5 diameter).
Kcv. ~2~)3
Appe~tdices
S.OG.3

1
i
~ ~ ,o
1
1
1
1
1
A
1
Appendicc.r
(.e-ASS ([LCP'R~
3 a -, ; ,
~~ !i ' j i ~ , ail ii Iljl'I
Outlet W = Do + La 90 i !! a tli Lll.i 1' lJl :,i
i e ~ ,I ~j iit~l iii it ~ I "..
diameter (Do) I i;i .I ~ ilj ~'i ''
La -'1 ~;' I ~ Ili ~ I I ° ~
~~
~ ~ ~ ~; it 1, !j~ i ~~
T ilwater 0.5Do i ~l,il
i it i I~t ~•
~~~~ tit i~ I ~ i ~ ~ ~I I;i ~ ~ III
Pp a ~i ~ it ~ ; I , I~ i i is
~~~v~~ 50 : i ~ ; ~ i 1 ~~~ i~ ~ 1 ,~ti ,, i ~ ~ Il~t i~~
. , IIII
~ ,,
~' I.~~.
~~ ~ ~ ( I o'a 4 i a f' i t4 i~ ~ ~Il ~t,
~i ,1, _' ~'!• 1'
4 ~ ~i I i' i, li' ' Z a ' i i' ! ! i I 1 ~pQ 4
~ III I~I~ ; j l l I I i 1 Iji tl ~ l,~i jlll i'~1 i~
I II 2A'I , l ~ I i`I i f~ i',` ~l
ii q~( i~i'i Ili i ~ i' it I :,~; ~ 2 ' i ~: i~ ~'i lili;~1 I I I
j ;fit iil ~I ij ~+l ~ i i ~ ~ i
u ~ j~ tf i L. 2 I d , ,~ '.I ;i~ '
, I i li 1 i' I ~ , i i li ~~ i ~ ~
,',~ I ~ ~ ; ;' I ,
'+j II I I~ ~ ,~ j,. t~~ i ,~ ,, 1 °',
ff+ f I II l i I ~ ;' ~ i~^
'ff ~ ill II 1 I ~ i~ :I i ~ ~' ~~ j' , " ~
(ji l i ~ ~{ _ _ ~_ _ I. ~ ' 1 -_ O ~ , ~ ~ Q i I I' .~ II; 2 _N
ff ~ ~ `;~
lii, I ~1~~, 1~~~ ~ ~ I ~ ~, ; l it ~ ~ ,, ati a '~ ; li,i'
ji;, ~~~E ii~i,,i t'i~ 1:;' , '' ,v 25 '~~ a ~t 'i; '..' r ;± a
„,} .ii~l,i~jf~,,~ ,~ ~ ,. ,~. , ,j iii,:; lu~;i;l~;. ~
I ,
• tl~i iil~ ~~ ~ ~ it j ' I ~~ - 20 i ~ ~ ~ ~ ~ ~ ~ ~'J ' I ~,i i; ~ i; o
..
rl } I } I ~ ~;t if" ~ ~~ ~~5 d ~~, I ~ ; I . ~; t ii, ' i I ~I ;~ l,l: 1 ~
~~ l I ' v _ 15 I .I ~ I ;l . .I u I I ,~,
~ 10 ,d , ~ ~;~ ~' d o.l.
v-
- S~
,,: .~ ,
V , s I i.... i I. ,;
I
0
3 5 10 20 50 100 200 500 1000
Discharge (ft3/sec)
'~~~ = 39.39 cs~S
Curves may not be extrapolated.
Figure II.O6a Design of outlet protection protection from a round pipe Mowing full, minimum tailwatcr condition (TW < 0.5 diameter).
iz~~. t~~3 8.06.3

1
1
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1
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1
1
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Appendices
~ 4V 1sil.~~ RCS)
D~C'R.~-~ .~ ~qrC~ ~ q ' x Z 3 '
A~'to-1 -ttt l etc-aJ~ z ~ g "
3 0 ',
'I I I ,
l11 I I~ ii;
Outlet W = Do + La 9p l i~;li, II I~ ,~l ,~
Pipe ; I , `jti ~. ~ i II,I '~.
diameter(Do) ~ ~Ii ~ Ili i(1~,..I
80 :a
La -~ I ~~ I I I ,I III I ~. ~'
T ilwater < 0.5De I I ; . ~ ~ tl " !'
{ ~I'
al~~~l. 74 - ~ ~ I ~ I ~ ~ i 'j l ll'~~1, ~ '
1 I~ ~ ~ "ili
1
~~ ; . i I III ii I I Ilti
Ppt°~ ~ .;;, II ,,Ill I , , ;, ! ,~ ,i;
60 }
~e~g`ro ~ I.. ;, i I II ~~ ~' I' I a'L, I i ,~~I• ' ,°~;~ ~I,.
f ,
I i I I ~ In.
}}
i ~ I ~ it ul;
~~ I ', I. oa I,,a~I ~I ,ii, i ~~,~~;
~: _:
4 I ,f_ I ,~. .27 a 11•x• ~ I ;, I I .Iii ~~cA I ,{ 4
~~ I ' ~ i2q I ~l~"i~Ill; ii, ,1t I ~,
3Q I, `~' . I : i ..L.. 2 d .I; li , }~ I ~' ll;, ,l:' ;il 1
~~
~ Iii i~~) III ~ ~... ~ ~ ;I , '1~ I i ~II~ ~~ '
I fl~~ I ! I I i.l ~ ' i
~ I"lii~illlll~ll it I IIII I 'd 1 ~ I I I I ~II it I
,I~l,~ll,~; I!I!~Ili'~ - 2 '~ ,I „ t ii ~ 1"'f lil ,, 3
I illl,~l II ' ;i iII ;II ! I I. ~ ; I I I II~~ !I i II ;~,~ , ry
l0 l I ;I,, I;l~ ill .,, .I I: I I;. ~ I u I 0 a "
. ;III r ! i , .. ; ' ~ ~ ~~ ;!, ~ r ~,
~I!I i'I I I , II 111 ~ II ~ I IIi1 i ~ ~ .. 1 I ~ ,J 1i.. I~ " 1 ~ ~I „
O tl, l iil I~I { I I' It .~ I I I». ~ ~ ~ N_
11 t ~ IIFFI~~ ~ ~ ~ 1 ' 1 I ~ 1~, I I I I,
li ~ 1l 111 11 I I ~ I11 i ` 1 .. l .~~__' I , ,~ I i III II 2
I I ~ I I ~ '' 1
i I I Q 1~ Iti Q
~It~ II ' Il ~ ~I ...~ ~ ~ l . I ~ . ..,~ ., ' '~' ~~' ~ la I I ,I I ,! II
'~I 'it II IIII I'~ '' : I t l1
lji fill+il , II I~ I ..v 25 ~ i, l j, Iifj j(~~111, a
III ~ I it I I, .1 '~ _ ~. ! I I li II ,II I ~~~
I ~i I I 11 ~I ,III I I O
~, ii ~_ : v = 2d ~ ~ I I I jl l I L i~1 ,n
I,. 5 d ~} t +,, 1 ~
I I~ v . 15 ~ ,f l I I ,~ :;
f,:
' ,I 1 ~ I i
v_ ,
10,d
I I
I I I I'
i I I
0
3 5 10 20 50 100 200 500 1000
Discharge (ft3/sec)
~o a St.dl ~S
Curves may not be extrapolated.
Figure f3.O6a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (TW < 0.5 diameter).
Kcv. 1203
8.06.:3

1
1
1
1
1
i
1
1
1
,~.~
1
1
1
1
1
1
1
1
1
Appendices
cvc.~7 : ~ 3t, ~~ 4i.P
pc9c~J ~4~+-t t ~~
ORtto~f vJ ~b'4k ~ 4 ~ x Z 3 ~
G.l~.+s ~ R-t P(~cP
3 0
Outlet W po + La
pipe
diameter (Do)
La --•I
,,~ T ilwater < 0.5Do

10
0
50 100
Discharge (ft3/sec)
.4>,~ i 41.~I c~
a>
2 N
Q
(~
Q
O
1 ~
~~t0.(~'
1000
Curves may not be extrapolated.
Figure II.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (TW < 0.5 diameter).
Rcv. 1 ~)3
~~~al`'~~l , i7
to ,':.
o~Pp so ~~, ~~.
,;
r I
~g~ ~I I ifs I,
~,
8.OG.3

tmp#4.txt
Culvert calculator
Entered Data:
Shappe ................
Number~of Barrels ...............
solving for' .....................
Ch-art Number ....................
Scale Number .................
Chart Description ...............
ENTRANCE
Scale Dessription ...............
overtopping .....................
Flowrate ........................
Manning's n .................
Roadway Elevation ...............
Inlet Elevation .................
Outlet Elevation ................
Diameter ........................
Length .......................
Entrance~Loss ...................
Tailwater .......................
Circular
1
Headwater
1
1
CONCRETE PIPE CULVERT; NO BEVELED RING
SQUARE EDGE ENTRANCE WITH HEADWALL
off
47.7100 cfs
0.0130
857.0000 ft
845.0000 ft
844.4000 ft
3.0000 ft
53.0000 ft
0.0000
0.1000 ft
Computed Results:
Headwater .......................
Slope ..........................
velocity ........................
848 8588 ft Inlet Control
0.0113 ft/ft
10.7663 fps
Messages:
Inlet head > outlet head.
Computing Inlet Control headwater.
Solving Inlet Equation 26.
solving Inlet Equation 28.
Headwater: 848.8588 ft
Page 1

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WET DETENTION POND DESIGN

~ r ~ ! ~ ~ ~ ~ ~ ~ ~ ~ ~ ~o~ s~ ~~ ~ ~ ~
~ ~®
engineer`s computation Pad
Q
~ r U1 .P W t+
< < ~
s ~~
~~
~~
~ ~~~
r
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4
F

Im envious Surface Area Allocation
Area Existing ISA' Net ISA Allowed2 Max. ISA Allowed Proposed ISA
Lot Y: (Zoning Tract A)
Tier 3
Tier 4
1.260 Ac.
1.229 Ac.
0.19 Ac.
0.16 Ac.
0.37 Ac.
0.53 Ac.
0.56 Ac.
0.69 Ac.
0.72 Ac.
0.80 Ac.

LOt W: {Zoning Tract B)
Tier 3
Tier 4
17.694 Ac.
2.817 Ac.
0.50 Ac.
0.52 Ac.
6.02 Ac.
1.15 Ac.
6.52 Ac.
1.67 Ac.
6.36 Ac.
1.56 Ac.3

Develoament Total:4
Tier 3
Tier 4
18.954 Ac.
4.046 Ac.
0.69 Ac.
0.68 Ac.
6.39 Ac.
1.68 Ac.
7.08 Ac.
2.36 Ac.
7.08 Ac.
2.36 Ac.
Total 23.000 Ac. 1.37 Ac. 8.07 Ac. 9.44 Ac. 9.44 Ac.
Notes:
1. 100% of the existing ISA is grandfathered and added to the net ISA allowed.
2. The net ISA is the area within each respective tier minus the existing ISA within that tier times the maximum percentage ISA of that tier.
3. Includes proposed public road and sidewalk.
4. The development total is for Lots Y and W.

1

1

Stormwater Management Summary
Site Area' 23.000 Ac.
Facisting ISA 1.37 Ac.
Proposed ISA 9.44 Ac.
WET n~TENTI4N Pt3ND #'I
On-Site D.A. to Pond #1 9.13 Ac.
Off-Site D.A. to Pond #1 0.53 Ac.
otal D.A. to Pond #1 9.66 Ac.
On-Site ISA draining to Pond #1 3.92 Ac.
Future On-Site ISA draining to Pond #1 1.69 Ac.2
Off-Site ISA drainin to Pond #1 0.44 Ac.3
otal ISA draining to Pond #1 6.05 Ac.
Max. ISA Per Pond Desi n4 6.28 Ac. 65.0%
1~IfL'i' ~~TENTIQN :POND #~ .
On-Site O.A. to Pond #2 7.67 Ac.
Off-Site D.A. to Pond #2 3.06 Ac.
Total D.A. to Pond #2 10.73 Ac.
On-Site ISA draining to Pond #2 4.00 Ac.
Off-Site ISA drainin to Pond #2 2.13 Ac.s
ota11SA draining to Pond #2 6.13 Ac.
Max. ISA Per Pond Designs 6.44 Ac. 60.0%
Notes:
1. The site area is the total development area for Lot Y (commercial site) and Lot W (apartment site).
2. Pond #1 has been designed to treat 1.89 Ac. ISA from Lot Y (commercial site).
3. Off-site ISA to Pond #1 includes approximately 0.44 Ac. from Eastchester Drive (NC Hwy 68).
4. Max. ISA per the pond design is the ISA within the pond's drainage area.
5. Off-site ISA to Pond #2 includes approximately 1.44 Ac. from Lot 3 (PB 97 PG 109) and
approximately 0.69 Ac. from Whites Mill Road.
t
1
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1

~ ~ ~ ~ ~ ~~ ~
Alexandria Park Apartments
Wet Detention Pond #1
Summary of Results

Date: December 8, 2006
Revised: April 16, 2007
Pre-Development Post Development
Peak Flow Peak flow Post Development
Design Stone (cfs) (cfs) W.S. Elevation
10-year 24.42 20.13 850.69
100-year 45.41 57.02 851.85

NCDENR Stormwater BMP Manual Chapter Revised 07-02-07
Table 10-1
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 85 Percent TSS
Pollutant Removal Efficiency in the Mountain and Piedmont Regions, Adapted from Driscoll,
19Rh

1

1

Percent
Impervious
Cover

3.0

4.0 Permanent Pool Average Depth (ft)

5.0 6.0 7.0

8.0

9.0
10 % 0.59 0.49 0.43 0.35 0.31 0.29 0.26
20 % 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30 % 1.34 1.08 0.97 0.83 0.70 0.64 0.62
40 % 1.73 1.43 1.25 1.05 0.90 0.82 0.77
50 % 2.06 1.73 1.50 1.30 1.09 1.00 0.92
60 % 2.40 2.03 1.71 1.51 1.29 1.18 1.10
70% 2.88 2.40 2.07 1.79 1.54 1.35 1.26
80% 3.36 2.78 2.38 2.10 1.86 1.60 1.42
90 % 3.74 3.10 2.66 2.34 2.11 1.83 1.67
Table 10-2
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 85 Percent TSS
Pollutant Removal Efficiency in the Coastal Revion. Adapted from l7riSm11. 19Rh

Percent
Impervious
Cover

3.0

3.5

4.0 Permanent Pool Average Depth (ft)

4.5 5.0 5.5 6.0

6.5

7.0

7.5'
10% 0.9 0.8 0.7 0.6 0.5 0 0 0 0 0
20% 1.7 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5
30% 2.5 2.2 1.9 1.8 1.6 1.5 1.3 1.2 1.0 0.9
40% 3.4 3.0 2.6 2.4 2.1 1.9 1.6 1.4 1.1 1.0
50% 4.2 3.7 3.3 3.0 2.7 2.4 2.1 1.8 1.5 1.3
60% 5.0 4.5 3.8 3.5 3.2 2.9 2.6 2.3 2.0 1.6
70% 6.0 5.2 4.5 4.1 3.7 3.3~ 2.9 2.5 2.1 1.8
80% 6.8 6.0 5.2 4.7 4.2 3.7 3.2 2.7 2.2 2.0
90% 7.5 6.5 5.8 5.3 4.8 4.3 3.8 3.3 2.8 1.3
100% 8.2 7.4 6.8 6.2 5.6 5.0 4.4 3.8 3.2 2.6
Wet Detention Basul 10-7 July 2007
1

WET DETENTION POND DESIGN
WET DETENTION POND #1
PRE-DEVELOPMENT
HYDROLOGIC ANALYSIS

t
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Table of Contents
Table of Contents
i
********************** MASTER SUMMARY **************«*******
Watershed....... Master Network Summary ............. 1.01
*************** NETWORK SUMMARIES (DETAILED) ***************
Watershed....... Pre.10
Executive Summary (Nodes) .......... 2.01
Watershed....... Pre100
Executive Summary (Nodes) .......... 2.02
************~********* RAINFALL DATA ***********************
TypeII 24hr.... Pre.10
Synthetic Cumulative Depth ......... 3.01
TypeII 24hr.... Pre100
Synthetic Cumulative Depth ......... 3.03
********************** TC CALCULATIONS *********************
TC (PRE)........ Tc Catcs ........................... 4.01
*********************s CN CALCULATIONS ******s**************
POND #1 (PRE)... Runoff CN-Area ..................... 5.01
******************** RUNOFF HYDROGRAPHS ********************
PRE-DEV......... Pre.10
SC5 Unit Hyd. Summary .............. 6.01
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

Table of Contents
Table of Contents (continued)
ii
PRE-DEV......... Pre100
SCS Unit Hyd. Summary .............. 6.02
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

Type.... Master Network Summary
Name.... Watershed
Fite.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
MASTER DESIGN STORM SUMMARY
Defautt Network Design Storm Fite, ID HP.RNQ
Totat
Depth Rainfall
Return Event in Type
Pre.10 5.1000 Synthetic Curve
Pre100 7.5000 Synthetic Curve
HP Storms
Page 1.01
RNF File RNF ID
SCSTYPES TypeII 24hr
SCSTYPES TypeII 24hr
MASTER NETWORK SUMMARY
SCS Unit Hydrograph Method
(*Node=Outfalt; +Node=Diversion;)
(Trun= HYG Truncation: Btank=None; L=Left; R=Rt; LR=Left&Rt)
Return HYG Vol
Storage
Node ID
------------- Type
---- ---- Event
------ ac-ft Trun
---------- --
*OUTLET JCT 10 1.648
*OUTLET JCT 100 3.052
PRE-DEV AREA 10 1.648
PRE-DEV AREA 100 3.052
Max
Qpeak Qpeak Max WSEL Pond
hrs cfs ft ac-ft
--------- -------- -------- ---------
12.0240 24.42
12.0240 45.41
12.0240 24.42
12.0240 45.41
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

Type.... Executive Summary (Nodes) Page 2.01
Name.... Watershed Event: 10 yr
Fite.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
Storm... TypeII 24hr Tag: Pre.10
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
DEFAULT Design Storm File,ID = HP.RNQ HP Storms

r
t

1
f
1
Storm Tag Name =
Description: 10-Year,
---------------------
Data Type, Fite, ID =
Storm Frequency =
Totat Rainfall Depth=
Duration Multiplier =
Resulting Duration =
Resulting Start Time=
Pre.10
24-Hour
--------------------------------------------
Synthetic Storm SCSTYPES.RNF TypeII 24hr
10 yr
5.1000 in
1
24.0000 hrs
.0000 hrs Step= .1000 hrs End= 24.0000 hrs
HYG Vot Qpeak Qpeak Max WSEL
-Node-ID--------- Type ---ac=ft--Trun_--hrs--- --cfs--- ---ft----
Outfatl OUTLET JCT 1.648 12.0240 24.42
PRE-DEV AREA 1.648 12.0240 24.42
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007
1

Type.... Executive Summary (Nodes) Page 2.02
Name.... Watershed Event: 100 yr
Fite.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
Storm... TypeII 24hr Tag: Pre100
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
DEFAULT Design Storm Fite,ID = HP.RNQ HP Storms
Storm Tag Name = Pre100
Description: 100-Year, 24-Hour
---------------------------------------
Data Type, Fite, ID = Synthetic Storm
Storm Frequency = 100 yr -------------
SCSTYPES.RNF ----------------
TypeII 24hr
Total Rainfall Depth= 7.5000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs En d= 24.0000 hrs
HYG Vot Qpeak Qpeak Max WSEL
Node
ID
Type
ac_ft
Trun_
hrs cfs
ft
-
---------
-
---
--
Outfalt OUTLET JCT 3.052 --
---
12.0240 --
--- ---
----
45.41
PRE-DEV AREA 3.052 12.0240 45.41

i
s

5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007
1

t

1
1

t
1

Type.... Synthetic Cumulative Depth Page 3.01
Name.... TypeII 24hr Tag: Pre.10 Event: 10 yr
File.... C:\HAESTAD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 10-Year, 24-Hour
Storm... TypeII 24hr Tag: Pre.10
CUMUL ATIVE RAINF ALL DEPTHS (in)
Time ~ Outpu t Time incr ement = .1000 hrs
hrs J Ti me on left represents time for first value in each row.
.0000 J .0000 .0052 .0103 .0156 .0208
.5000 J .0262 .0315 .0370 .0424 .0480
1.0000 ~ .0536 .0592 .0649 .0706 .0764
1.5000 J .0823 .0881 .0941 .1001 .1061
2.0000 ~ .1122 .1184 .1245 .1308 .1371
2.5000 J .1435 .1498 .1563 .1628 .1694
3.0000 ~ .1760 .1826 .1893 .1961 .2029
3.5000 ~ .2098 .2166 .2236 .2306 .2377
4.0000 J .2448 .2520 .2593 .2667 .2742
4.5000 ~ .2818 .2895 .2973 .3052 .3132
5.0000 ~ .3213 .3295 .3378 .3462 .3548
5.5000 ~ .3634 .3721 .3809 .3898 .3989
6.0000 ~ .4080 .4172 .4266 .4360 .4455
6.5000 ~ .4552 .4649 .4748 .4847 .4948
7.0000 ~ .5049 .5152 .5255 .5360 .5465
7.5000 ~ .5572 .5679 .5788 .589$ .6008
8.0000 J .6120 .6235 .6355 .6480 .6610
8.5000 ~ .6745 .6885 .7030 .7181 .7336
9.0000 J .7497 .7660 .7823 .7987 .8150
9.5000 J .8313 .8480 .8656 .8839 .9031
10.0000 ~ .9231 .9441 .9663 .9898 1.0145
10.5000 ~ 1.0404 1.0679 1.0975 1.1291 1.1628
11.0000 ( 1.19$5 1.2377 1.2817 1.3307 1.3845
11.5000 ( 1.4433 1.5649 1.8072 2.1970 2.8961
12.0000 ~ 3.3813 3.4780 3.5631 3.6365 3.6983
12.5000 J 3.7485 3.7915 3.8319 3.8697 3.9048
13.0000 J 3.9372 3.9676 3.9966 4.0241 4.0502
13.5000 ~ 4.0749 4.0984 4.1208 4.1422 4.1626
14.0000 ~ 4.1820 4.2007 4.2190 4.2370 4.2546
14.5000 J 4.2719 4.2888 4.3054 4.3215 4.3374
15.0000 ~ 4.3529 4.3680 4.3827 4.3972 4.4112
15.5000 ~ 4.4249 4.4382 4.4512 4.4638 4.4761
16.0000 J 4.4880 4.4997 4.5112 4.5226 4.5339
16.5000 J 4.5451 4.5561 4.5670 4.5778 4.5$84
17.0000 J 4.5989 4.6093 4.6196 4.6297 4.6397
17.5000 ~ 4.6496 4.6594 4.6690 4.6785 4.6879
18.0000 ~ 4.6971 4.7062 4.7152 4.7241 4.7328
18.5000 J 4.7414 4.7499 4.7582 4.7665 4.7746
19.0000 ~ 4.7825 4.7904 4.7981 4.8057 4.8131
19.5000 J 4.8205 4.8277 4.8347 4.8417 4.8485
20.0000 ~ 4.8552 4.8618 4.8684 4.8750 4.8815
20.5000 ~ 4.8880 4.8945 4.9010 4.9074 4.9139
21.0000 ~ 4.9202 4.9266 4.9329 4.9392 4.9455
21.5000 J 4.9518 4.9580 4.9642 4.9704 4.9766
22.0000 ~ 4.9827 4.9888 4.9949 5.0010 5.0070
S/N: 621605806A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying, Inc.
Compute Time: 10:23:00 Date: 01/26/2007
1

' Type.... Synthetic Cumulative Depth Page 3.02
Name.... TypeIl 24hr Tag: Pre.10 Event: 10 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title...
Storm... 10-Year, 24-Hour
TypeII 24hr Tag: Pre.10
CUMULATIVE RAINFALL DEPT HS (in)
Time ~ Output Time increment = .1000 hrs
' hrs ~ Time on left represents time for first value in each row.

' 22.5000
23.0000 ~ 5.0130 5.0190 5.0249
~ 5.0426 5.0485 5.0543 5.0308
5.0601 5.0368
5.0659
23.5000 ~ 5.0716 5.0774 5.0831 5.0887 5.0944
24.0000 ~ 5.1000

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S/N; 621605B06ASF CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007
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Type.... Synthetic Cumulative Depth Page 3.03
Name.... TypeII 24hr Tag: Pre100 Event: 100 yr
File..., C:\HAESTAD\PPK W\RAINFALL\SCSTY PES.RNF
Title... 100-Year, 24-H our
Storm... TypeII 24hr Tag: Pre100
CUMULATIVE RAINF ALL DEPT HS (in)
Time ( Output Time incr ement = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
.0000 ~ .0000 .0076 ,0152 .0229 .0306
.5000 ( .0385 .0464 .0544 .0624 .0706
1.0000 ~ .0788 .0871 .0954 .1039 .1124
1.5000 ~ .1210 .1296 .1384 .1472 .1561
2.0000 ~ .1650 .1741 .1832 .1924 .2016
2.5000 ~ .2110 .2204 .2299 .2394 .2491
3.0000 f .2588 .2686 .2784 .2884 .2984
3.5000 ~ .3085 .3186 .3289 .3392 .3496
4.0000 ~ .3600 .3706 .3813 .3922 .4032
4.5000 ~ .4144 .4257 .4372 .4488 .4606
5.0000 ~ .4725 .4846 .4968 .5092 .5217
5.5000 ~ .5344 .5472 .5602 .5733 .5866
6.0000 ~ .6000 .6136 .6273 .6412 .6552
6.5000 ~ .6694 .6837 .6982 .7128 .7276
7.0000 ~ .7425 .7576 .7728 .7882 .$037
7.5000 ~ .8194 .8352 .8512 .8673 .8836
8.0000 ~ .9000 .9169 .9345 .9529 .9720
8.5000 ~ .9919 1.0125 1.0339 1.0560 1.0789
9.0000 ~ 1.1025 1.1265 1.1505 1.1745 1.1985
9.5000 ~ 1.2225 1.2471 1.2729 1.2999 1.3281
10.0000 ~ 1.3575 1.3884 1.4211 1.4556 1.4919
10.5000 ~ 1.5300 1.5705 1.6140 1.6605 1.7100
11.0000 ~ 1.7625 1.8201 1.8849 1.9569 2.0361
11.5000 ~ 2.1225 2.3013 2.6577 3.2309 4.2590
12.0000 ~ 4.9725 5.1147 5.2398 5.3478 5,4387
12.5000 ~ 5.5125 5.5758 5.6352 5.6907 5.7423
13.0000 ~ 5.7900 5.8347 5.8773 5.9178 5.9562
13.5000 ~ 5.9925 6.0270 6.0600 6.0915 6.1215
14.0000 ~ 6.1500 6.1775 6.2045 6.2309 6.2568
14.5000 ( 6.2822 6.3071 6.3314 6.3552 6.3785
15.0000 ~ 6.4013 6.4235 6.4452 6.4664 6.4871
15.5000 ~ 6.5072 6.5268 6.5459 6.5645 6.5825
16.0000 ~ 6.6000 6.6172 6.6341 6.6509 6.6675
16.5000 ~ 6.6839 6.7001 6.7162 6.7320 6.7477
17.0000 ~ 6.7631 6.7784 6.7935 6.8084 6.8231
17.5000 ~ 6.8377 6.8520 6.8662 6.8801 6.8939
18.0000 ~ 6.9075 6.9209 6.9341 6.9472 6.9600
18.5000 ~ 6.9727 6.9851 6.9974 7.0095 7.0214
19.0000 ~ 7.0331 7.0447 7.0560 7.0672 7.0781
19.5000 ~ 7.0889 7.0995 7.1099 7.1201 7.1302
20.0000 ( 7.1400 7.1498 7.1594 7.1691 7.1787
20.5000 ~ 7.1883 7.1978 7.2074 7.2168 7.2263
21.0000 ~ 7.2356 7.2450 7.2543 7.2636 7.2728
21.5000 ~ 7.2821 7.2912 7.3004 7.3094 7.3185
22.0000 ~ 7.3275 7.3365 7.3454 7.3544 7.3632
5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

' Type.... Synthetic Cumutative Depth Page 3.04
Name.... TypeII 24hr Tag: Pre100 Event: 100 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
' Title...
Storm... 100-Year, 24-Hour
TypeII 24hr Tag: Pre100
CUMULATIVE RAINFALL DEPT HS (in)
Time ~ Output Time increment = .1000 hrs
' hrs ~ Time on left represents time for first value in each row.

' 22.5000
23.0000 ~ 7.3721 7.3808 7.3896
~ 7.4156 7.4243 7.4328 7.3983
7.4414 7.4070
7.4498
23.5000 ~ 7.4583 7.4667 7.4751 7.4834 7.4918
24.0000 ( 7,5000
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S/N: 621605B06A8F CPT Engineering & Surveying, Tnc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

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Type.... Tc Calcs Page 4.01
Name.... TC (PRE)
File.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
Title... Tc (Pre)
TIME OF CONCENTRATION CALCULATOR
Tc (Pre}
--------------------------------
Segment #1:
Description:
Mannings n
Hydraulic Le
2yr, 24hr P
Slope
Tc: TR-55 Sheet
Sheet Ftow
.1500
ngth 167.00 ft
3.5000 in
.030000 ft/ft
Avg.Velocity .23 ft/sec
Segment #1 Time: .2001 hrs
Segment #2: Tc: TR-55 Shallow
Description: Shallow Conc Flout
Hydraulic Length 517.00 ft
Slope .068000 ft/ft
Unpaved
Avg.Velocity 4.21 ft/sec
Segment #2 Time: .0341 hrs
------------------------------------------------------------------------
Total Tc: .2342 hrs
S/N: 621605606A8F CPT Engineering & Surveying, Ync.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

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Type.... Tc Calcs Page 4.02
Name.... TC (PRE)
File.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
Title... Tc (Pre)
Tc-Equations-used__.
___= SCS TR-55 Sheet Flow ______________________________________________
Tc = (.007 * ((n * Lf)**0.8)) / ((P**.5) * (Sf**.4))
Where: Tc = Time of concentration, hrs
n = Mannings n
Lf = Ftow length, ft
P = 2yr, 24hr Rain depth, inches
Sf = Slope, ft/ft
__-= SCS TR-55 Shallow Concentrated Ftow _______________________________
Unpaved surface:
V = 16.1345 * (Sf**0.5)
Paved surface:
V = 20.3282 * (Sf**0.5)
Tc = (Lf / V) / (3600sec/hr)
Where: V =Velocity, ft/sec
Sf = Slope, ft/ft
Tc = Time of concentration, hrs
Lf = Ftow length, ft
5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

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Type.... Runoff CN-Area Page 5.01
Name.... POND #1 (PRE)
Fite.... F:\PROJECTS\424-04\CALCS\POND1- PRE.PPW
Title... Pond #1: (Pre-developed)
RUNOFF CURVE NUMBER DATA
Pond #1: (Pre-developed)
----------------------------------
------
---------
-------------------------
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres 96C 96UC CN
Woods good hydrologic condition 70 4.960 70.00
Grass, good hydrologic condition 74 2.930 74.00
Impervious Areas 98 .490 98.00
COMPOSITE AREA & WEIGHTED CN ---> 8.380 73.04 (73)
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

' Type.... SCS Unit Hyd. Summary Page 6.01
Name.... PRE-DEV Tag: Pre.10 Event: 10 yr
Fite.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
' Storm... TypeII 24hr Tag: Pre.10
SCS UNIT HYDROGRAPH METHOD
STORM EVENT: 10 year storm
Duration = 24.0000 hrs Rain Depth = 5.1000 in
Rain Dir = C:\HAESTAD\PPKW\RAINFALL\
Rain File -ID = SCSTYPES.RNF - TypeII 24hr
Unit Hyd Type = Default Curvilinear
HYG Dir F:\PROJECTS\424 04\CALCS\
HYG Fite - ID = P1-PRE.HYG - PRE-DEV Pre.10
Tc = .2342 hrs
Drainage Area = $.380 acres Runoff CN= 73
_____________ _______________________________
Computational Time Increment .03123 hrs
Computed Peak Time 12.0243 hrs
Computed Peak Ftow = 24.44 cfs
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Time Increment for HYG Fite = .0167 hrs
Peak Time, Interpolated Output = 12.0239 hrs
Peak Flow, Interpolated Output = 24.42 cfs
____________________________________________
DRAINAGE AREA
ID:Pond #1 (Pre)
CN = 73
Area = 8.380 acres
S = 3.6986 in
0.25 = .7397 in
Cumulative Runoff
2.3591 in
1.647 ac-ft
HYG Volume... 1.648 ac-ft (area under HYG curve)
***** UNIT HYDROGRAPH PARAMETERS *****
Time Concentration, Tc = .23424 hrs (ID: Tc (Pre))
Computational Incr, Tm = .03123 hrs = 0. 20000 Tp
Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb)
K 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp))
Receding/Rising, Tr/Tp = 1.6698 (solved from K = .7491)
Unit peak, qp = 40.53 cfs
Unit peak time Tp = .15616 hrs
Unit receding limb, Tr = .62464 hrs
total unit time, Tb = .78080 hrs
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

Type.... SCS Unit Hyd. Summary Page 6,02
Name.... PRE-DEV Tag: Pre100 Event: 100 yr
File.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
' Storm... TypeII 24hr Tag: Pre100
SCS UNIT HYDROGRAPH METHOD
STORM EVENT: 100 year storm
' Duration = 24.0000 hrs Rain Depth = 7.5000 in
Rain Dir = C:\HAESTAD\PPKW\RAINFALL\
Rain Fite -ID = SCSTYPES.RNF - TypeII 24hr
Unit Hyd Type = Default Curvilinear
HYG Dir = F:\PROJECTS\424-04\CALCS\
HYG File - ID = P1-PRE.HYG - PRE-DEV Pre100
Tc = .2342 hrs
Drainage Area = 8.380 acres Runoff CN= 73

Computational Time Increment .03123 hrs
Computed Peak Time 12.0243 hrs
Computed Peak Ftow = 45.44 cfs

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Time Increment for HYG File = .0167 hrs
Peak Time, Interpolated Output = 12.0239 hrs
Peak Ftow, Interpolated Output = 45.41 cfs
DRAINAGE AREA
ID:Pond #1 (Pre)
CN = 73
Area = 8.380 acres
S = 3.6986 in
0.25 = .7397 in
Cumulative Runoff
4.3696 in
3.051 ac-ft
HYG Volume... 3.052 ac-ft (area under HYG curve)
***** UNIT HYDROGRAPH PARAMETERS *****
Time Concentration, Tc = .23424 hrs (ID: Tc (Pre))
Compu tational Incr, Tm .03123 hrs = 0. 20000 Tp
Unit Hyd. Shape Fact or = 483.432 (37.46% under rising limb)
K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp))
Reced ing/Rising, Tr/ Tp = 1.6698 (solved firom K = .7491)
Unit peak, qp = 40.53 cfs
Unit peak time Tp = .15616 hrs
Unit receding limb, Tr = .62464 hrs
Total unit time, Tb = .78080 hrs
5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007
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Appendix A
Index of Starting Page Numbers for ID Names
-- P -
POND #1 (PRE)... 5.01
PRE-DEV Pre.10... 6.01, 6.02
-- T --
TC (PRE)... 4.01, 3.01, 3.03
----- W -----
Watershed... 1.01, 2.01, 2.02
A-1
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

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WET DETENTION POND DESIGN
WET DETENTION POND #1

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DISCHARGE FOR OVERFLOW WEIR
STAGE
-
Project: Alexandria Park Apartments
Location: Wet Detention Pond #1
NC Hwy 68 & Whites Mill Road
High Point, N.C.
Developer: Blue Ridge Companies
D
Input
ata:
Overflow Wei r #1 Overflow Weir #2
Cw= 3.00 in. Cw= 3.00 in.
Elev.= 849 Spillway crest Elev.= 850.5 Spillway crest
L= 3 ft., Weir length L= 12 ft., Weir length

Water Quality Release (orifice)
D= 2 in.
Elev.= 847 Invert elev. of release
Cd= 0.60 Orifice Coefficient
Emergency Spillway Dam Overtopping
Cw= 3.00 in. Cw= 3.00 in.
Elev.= 0 Emerg. spillway crest Elev.= 853 Top of dam
L= 0 ft., Weir length L= 290 ft., Weir length
Stage Increme nt 0.50 ft. ,

1 2 3 4 5 6 7 8 9
Stage WQ Weir #1 Weir #2 Combined Principal Emergency Dam Total
release Weir Spillway Spillway Overtopping Outflow
[ft•I [~~] [~~l [~~l [~~l [~~] [~~) [~~l [~~]
847.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
847.50 0.07 0.00 0.00 0.00 0.07 0.00 0.00 0.07
848.00 0.10 0.00 0.00 0.00 0.10 0.00 0.00 0.10
848.50 0.12 0.00 0.00 0.00 0.12 0.00 0.00 0.12
849.00 0.15 0.00 0.00 0.00 0.15 0.00 0.00 0.15---
849.50 0.16 3.18 0.00 3.18 3.35 0.00 0.00 3.35
850.00 0.18 9.00 0.00 9.00 9.18 0.00 0.00 9.18
850.50 0.19 16.53 0.00 16.53 16.73 0.00 0.00 16.73
851.00 0.21 25.46 12.73 25.46 25.66 0.00 0.00 25.66
851.50 0.22 35.58 36.00 36.00 36.22 0.00 0.00 36.22
' 852.00 0.23 46.77 66.14 66.14 66.37 0.00 0.00 66.37
852.50 0.24 58.93 101.82 101.82 102.07 0.00 0.00 102.07
853.00 0.26 72.00 142.30 142.30 142.56 0.00 0.00 142.56
853.50 0.27 85.91 187.06 187.06 187.33 0.00 307.59 494.92
854.00 0.28 100.62 235.72 235.72 236.00 0.00 870.00 1106.00
854.50 0.29 116.09 288.00 288.00 288.29 0.00 1598.29 1886.58
855.00 0.30 132.27 343.65 343.65 343.95 0.00 2460.73 2804.68
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WET DETENTION POND #1
WET DETENTION POND
DESIGN ROUTING

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Table of Contents
Table of Contents
i
******************s*** MASTER SUMMARY **********************
Watershed....... Master Network Summary ............. 1.01
*************** NETWORK SUMMARIES (DETAILED) ***************
Watershed....... Dev.10
Executive Summary (Nodes) .......... 2.01
Watershed....... Dev100
Executive Summary (Nodes) .......... 2.02
****************** DESIGN STORMS SUMMARY *******************
HP Storms....... Design Storms ...................... 3.01
**********:**:******** RAINFALL DATA ***:*********:********:
TypeII 24hr.... Dev.10
Synthetic Cumulative Depth ......... 4.01
TypeII 24hr.... Dev100
Synthetic Cumulative Depth ......... 4.03
********************** CN CALCULATIONS ***s*****************
POND #1 (POST).. Runoff CN-Area ..................... 5.01
**********************s POND VOLUMES *:*:*******:******:s***
POND #1......... Vol: Elev-Area ..................... 6.01
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

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Table of Contents
Table of Contents (continued)
ii
******************** OUTLET STRUCTURES *********************
OUTLET DEVICE... Outlet Input Data .................. 7.01
****************:****** PONO ROUTING ***********************
POND #1......... Pond E-V-Q Table ................... 8.01
POND #1 OUT Dev.10
Pond Routing Summary ............... 8.02
POND #1 OUT Dev100
Pond Routing Summary ............... 8.03
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

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Type.... Master Network Summary Page 1.01
Name.... Watershed
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
MASTER DESIGN STORM SUMMARY
Default Network Design Storm Fite, ID HP.RNQ HP Storms
Total
Depth Rainfall
Return Event in Type RNF Fite RNF ID
------------ ------ ---------------- -------- ----------------
Dev.10 5.1000 Synthetic Curve SCSTYPES TypeII 24hr
Dev100 7.5000 Synthetic Curve SCSTYPES TypeII 24hr
MASTER NETWORK SUMMARY
SCS Unit Hydrograph Method
(*Node=Outfall; +Node=Diversion;)
(Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt)
Return HYG Vol
Storage
Node ID
----------------- Type
---- Event
------ ac-ft Trun
---------- --
*OUTLET JCT 10 2.248
*OUTLET JCT 100 4.045
POND #1 IN POND 10 2.706
POND #1 IN POND 100 4.521
POND #1 OUT POND 10 2.248
1.216
POND #1 OUT POND 100 4.045
1.667
POST-DEVELOPED AREA 10 2.706
POST-DEVELOPED AREA 100 4.521
Max
Qpeak Qpeak Max WSEL Pond
hrs
--------- cfs
-------- ft ac-ft
-------- ---------
12.0741 20.13
12.0240 57.02
11.9238 50.31
11.9238 82.11
12.0741 20.13 850.69
12.0240 57.OZ 851.85
11.9238 50.31
11.9238 82.11
S/N: 621605806A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Executive Summary (Nodes) Page 2.01
Name.... Watershed Event: 10 yr
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Storm... TypeII 24hr Tag: Dev.10
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
DEFAULT Design Storm File,ID = HP.RNQ HP Storms
Storm Tag Name = Dev.10
Description: 10-Year, 24-Hour
-----------
-
----------
-------------
----------------
----------------
-
Data Type, File, ID = Synthet ic Storm SCSTYPES.RNF TypeII 24hr
Storm Frequency = 10 yr
Total Rainfall Depth= 5.1000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 h rs Step= .1000 hrs En d= 24.0000 hrs
HYG Vol Qpeak Qpeak Max WSEL
Node
ID Type hrs
r
ac=ft
Trun_ -cfs--- ---ft----
-
-
---------
Outfalt OUTLET --
JCT --
-
2.248 --
--
12.0741 -
20.13
POND #1 IN POND 2.706 11.9238 50.31
POND #1 OUT POND 2.248 12.0741 20.13 850.69
POST-DEVELOPED AREA 2.706 11.9238 50.31
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5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007
f

Type.... Executive Summary (Nodes)
Name.... Watershed Page 2.02
Event: 100 yr
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Storm... TypeII 24hr Tag: Dev100
NETWORK SUMMARY
-- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
DEFAULT Design Storm File,ID = HP.RNQ HP Storms
Storm Tag Name = Dev100
Description: 100-Year, 24-Hour
------------
-
-------------
----------------
-
-------------------------
Data Type, File, ID Synthetic Storm
Storm Frequency = 100 yr SCSTYPES.RNF TypeII 24hr
Total Rainfall Depth 7.5000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step=
.1000 hrs End= 24.0000 hrs
HYG Vol Qpeak Qpeak Max WSEL
hrs---
Trun_
ac_ft
Type
Node
ID --cfs--- ---ft----
--
---
---------
-
-
Outfall OUTLET JCT 4.045 --
12.0240 57.02
#1 IN POND 4.521
POND
POND #1 OUT POND 4.045 11.9238
12.0240 82.11
57.02 851.85
-
POST DEVELOPED AREA 4.521 11.9238 82.11
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r 5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765} Compute Time: 16:02:09 Date: 04/16/2007
1

Type.... Design Storms Page 3.01
Name.... HP Storms
File.... C:\HAESTAD\PPKW\RAINFALL\HP.RNQ
Title... Alexandria Park Apartments
NC Hwy 68 & Whites Mitt Road
Blue Ridge Companies, Inc.
Pond #1 (Post-developed)
DESIGN STORMS SUMMARY
Design Storm File,ID = HP.RNQ HP Storms
Storm Tag Name = Dev.10
Description: 10-Year, 24-Hour
----------------------------------------------------------------------
Data Type, File, ID = Synthetic Storm SCSTYPES.RNF TypeII 24hr
Storm Frequency = 10 yr
Total Rainfall Depth= 5.1000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs
' Storm Tag Name = Dev100
Description -100_Year~-24=Hour----------------------------------------
Data Type, File, ID = Synthetic Storm SCSTYPES.RNF TypelI 24hr
Storm Frequency = 100 yr
Total Rainfall Depth= 7.5000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs
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S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Synthetic Cumulative Depth Page 4.01
Name.... TypeIl 24hr Tag: Dev.10 Event: 10 yr
File.... C:\HAESTAD\PPK W\RAINFALL\SCSTY PES.RNF
Title... 10-Year, 24-Ho ur
~' Storm... TypelI 24hr Tag: Dev.10
CUMULATIVE RAINF ALL DEPT HS (in)
Time ~ Dutput Time incr ement = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
.0000
.5000 ~ .0000
~ .0262 .0052
.0315 .0103
.0370 .0156
.0424 .0208
.0480
1.0000 ~ .0536 .0592 .0649 .0706 .0764
1.5000 ~ .0823 .0881 .0941 .1001 .1061
2.0000
2.5000 ~ .1122
~ .1435 .1184
.1498 .1245
.1563 .1308
.1628 .1371
.1694
3.0000 ~ .1760 .1826 .1893 .1961 .2029
3.5000 ~ .2098 .2166 .2236 .2306 .2377
4.0000 ~ .2448 .2520 .2593 .2667 .2742
4.5000 ~ .2818 .2895 .2973 .3052 .3132
5.0000 ~ .3213 .3295 .3378 .3462 .3548
5.5000
6.0000 ~ .3634
~ .4080 .3721
.4172 .3809
.4266 .3898
.4360 .3989
.4455
6.5000 ~ .4552 .4649 .4748 .4847 .4948
7.0000 ~ .5049 .5152 .5255 .5360 .5465
7.5000
8.0000 ~ .5572
~ .6120 .5679
.6235 .5788
.6355 .5898
.6480 .6008
.6610
8.5000 ~ .6745 .6885 .7030 .7181 .7336
9.0000 ~ .7497 .7660 .7823 .7987 .8150
9.5000 ~ .8313 .8480 .8656 .8839 .9031
10.0000 ( .9231 .9441 .9663 .9898 1.0145
10.5000 ~ 1.0404 1.0679 1.0975 1.1291 1.1628
11.0000 ~ 1.1985 1.2377 1.2817 1.3307 1.3845
~' 11.5000 ~ 1.4433 1.5649 1.8072 2.1970 2.8961
12.0000 ~ 3.3813 3.4780 3.5631 3.6365 3.6983
12.5000 ~ 3.7485 3.7915 3.8319 3.8697 3.9048
13.0000
13.5000 ~ 3.9372
( 4.0749 3.9676
4.0984 3.9966
4.1208 4.0241
4.1422 4.0502
4.1626
14.0000 ~ 4.1820 4.2007 4.2190 4.2370 4.2546
14.5000 ~ 4.2719 4.2888 4.3054 4.3215 4.3374

~~ 15.0000
15.5000 ~ 4.3529
~ 4.4249 4.3680
4.4382 4.3827
4.4512 4.3972
4.4638 4.4112
4.4761
16.0000 ( 4.4880 4.4997 4.5112 4.5226 4.5339
16.5000 ~ 4.5451 4.5561 4.5670 4.5778 4.5884
17.0000 ~ 4.5989 4.6093 4.6196 4.6297 4.6397
17.5000 ~ 4.6496 4.6594 4.6690 4.6785 4.6879
18.0000 ~ 4.6971 4.7062 4.7152 4.7241 4.7328
' 18.5000
19.0000 ~ 4.7414
~ 4.7825 4.7499
4.7904 4.7582
4.7981 4.7665
4.8057 4.7746
4.8131
19.5000 ~ 4.8205 4.8277 4.8347 4.8417 4.8485
20.0000 ~ 4.8552 4.8618 4.8684 4.8750 4.8815
~I 20.5000
21.0000 ~ 4.8880
~ 4.9202 4.8945
4.9266 4.9010
4.9329 4.9074
4.9392 4.9139
4.9455
21.5000 ~ 4.9518 4.9580 4.9642 4.9704 4.9766
22.0000 ~ 4.9827 4.9888 4.9949 5.0010 5.0070

i
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type....
Name.... Synthetic Cumulative Depth
TypeII 24hr Tag: Dev.10 Page 4.02
Event: 10 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title...
Storm... 10-Year, 24-Hour
TypeII 24hr Tag: Dev.10
CUMULATIVE RAINFALL DEPTHS (in)
Time ~ Output Time increment = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
22.5000
23.0000 ~ 5.0130 5.0190 5.0249
~ 5.0426 5.0485 5.0543 5.0308
5.0601 5.0368
5.0659
23.5000 ~ 5.0716 5.0774 5.0831 5.0887 5.0944
24.0000 ~ 5.1000

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5lN: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Synthetic Cumulative Depth
Name.... TypeII 24hr Tag: Dev100
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title... 100-Year, 24-Hour
Storm... TypeII 24hr Tag: Dev100
Time
hrs
0000
.
.5000
1.0000
1.5000
2.0000
2.5000
3.0000
3.5000
, 4.0000
~ 4.5000
5.0000
5.5000
6.0000
6.5000
7.0000
7.5000
8.0000
8.5000
9.0000
9.5000
1a.D0oo
10.5000
11.0000
11.5000
12.0000
12.5000
13.0000
13.5000
14.0000
14.5000
15.0000
15.5000
16.0000
16.5000
17.0000
17.5000
18.0000
18.5000
19.0000
19.5000
20.0000
20.5000
21.0000
21.5000
22.0000
1
Page 4.03
Event: 100 yr
CUMULATIVE RAINFALL DEPTHS (in)
Output Time increment = .1000 hrs
Time on left represents time for first value
------- in each row.
-------------
-----------------
.0000 ----------
.0076 ---------
.0152 ------
.0229 .0306
.0385 .0464 .0544 .0624 .0706
.0788 .0871 .0954 .1039 .1124
.1210 .1296 .1384 .1472 .1561
.1650 .1741 .1832 .1924 .2016
.2110 .2204 .2299 .2394 .2491
.2588 .2686 .2784 .2884 .2984
.3085 .3186 .3289 .3392 .3496
.3600 .3706 .3813 .3922 .4032
.4144 .4257 .4372 .4488 .4606
.4725 .4846 .4968 .5092 .5217
.5344 .5472 .5602 .5733 .5866
.6000 .6136 .6273 .6412 .6552
I' .6694 .6837 .6982 .7128 .7276
.7425 .7576 .7728 .7882 .8037
.8194 .8352 .8512 .8673 .8836
~ .9000 .9169 .9345 .9529 .9720
~ .9919 1.0125 1.0339 1.0560 1.0789
~ 1.1025 1.1265 1.1505 1.1745 1.1985
~ 1.2225 1.2471 1.2729 1.2999 1.3281
~ 1.3575 1.3884 1.4211 1.4556 1.4919
~ 1.5300 1.5705 1.6140 1.6605 1.7100
~ 1.7625 1.8201 1.8849 1.9569 2.0361
~ 2.1225 2.3013 2.6577 3.2309 4.2590
~ 4.9725 5.1147 5.2398 5.3478 5.4387
5.5125 5.5758 5.6352 5.6907 5.7423
~ 5.7900 5.8347 5.8773 5.9178 5.9562
~ 5.9925 6.0270 6.0600 6.0915 6.1215
~ 6.1500 6.1775 6.2045 6.2309 6.2568
~ 6.2822 6.3071 6.3314 6.3552 6.3785
~ 6.4013 6.4235 6.4452 6.4664 6.4871
~ 6.5072 6.5268 6.5459 6.5645 6.5825
~ 6.6000 6.6172 6.6341 6.6509 6.6675
~ 6.6839 6.7001 6.7162 6.7320 6.7477
~ 6.7631 6.7784 6.7935 6.8084 6.8231
~ 6.$377 6.8520 6.8662 6.8801 6.8939
~ 6.9075 6.9209 6.9341 6.9472 6.9600
~ 6.9727 6.9851 6.9974 7.0095 7.0214
~ 7.0331 7.0447 7.0560 7.0672 7.0781
~ 7.0889 7.0995 7.1099 7.1201 7.1302
~ 7.1400 7.1498 7.1594 7.1691 7.1787
~ 7.1883 7.1978 7.2074 7.2168 7.2263
~ 7.2356 7.2450 7.2543 7.2636 7.2728
~ 7.2821 7.2912 7.3004 7.3094 7.3185
I 7.3275 7.3365 7.3454 7.3544 7.3632
S/N: 621605606A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying, Inc.
Compute Time: 16:02:09 Date: 04/16/2007
1

Type.... Synthetic Cumulative Depth Page 4.04
Name.... TypeII 24hr Tag: Dev100 Event: 100 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title...
Storm... 100-Year, 24-Hour
TypeII 24hr Tag: Dev100

Time CUMULATIVE RAINFALL DEPT
~ Output Time increment = HS (in)
.1000 hrs
hrs ~ Time on left represents time for first value in each row.

1 22.5000
23.0000 ~ 7.3721 7.3808 7.3896
~ 7.4156 7.4243 7.4328 7.3983
7.4414 7.4070
7.4498
23.5000 ~ 7.4583 7.4667 7.4751 7.4834 7.4918
24.0000 ~ 7.5000
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S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Runoff CN-Area Page 5.01
Name.... POND #1 (POST)
File.... F:\PROJECTS\424-04\CALCS\POND1-
Title... Pond #1 (Post-developed) POST.PPW
RUNOFF CURVE NUMBER DATA
Pond #1 (Post-developed)
---------------------------------------- ---------- ------------------------
Impervious
Area Adjustment Adjusted
Soil/Surface Description ------- CN
Impervious Areas 98 --acres--
6.050 %C %UC CN
98.00
Open space, good condition 61
COMPOSITE AREA & WEIGHTED CN ---> 3.610
9.660 61.00
84.17 (84)
........................................ .......... .........................

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5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16!2007

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Type.... Vol: Elev-Area Page 6.01
Name.... POND #1
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Title... Pond #1
Elevation Planimeter Area Al+A2+sgr(A1*A2) Volume Volume Sum
(ft) (sq.in) (acres) (acres)
---------- (ac-ft)
---------- (ac-ft)
-------------
------------
847.00 ---------------------
----- .2850 ------
.0000 .000 .000
848.00 ----- .3090 .8908 .297 .297
849.00 ----- .3330 .9628 .321 .618
850.00 ----- .3580 1.0363 .345 .963
852.00 ----- .4090 1.1497 .766 1.730
853.00 ----- .4360 1.2673 .422 2.152
POND VOLUME EQUATIONS
* Incremental volume computed by the Conic Method for Reservoir Volumes.
Volume = (1/3) * (EL2-EL1) * (Areal + Areal + sq.rt.(Area1*Area2))
where: EL1, EL2 = Lower and upper elevations of the increment
Areal,Area2 =Areas computed for EL1, EL2, respectively
Volume = Incremental volume between EL1 and EL2
5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

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Type.... Outlet Input Data
Name.... OUTLET DEVICE
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Title... Outlet Structure
REQUESTED POND WS ELEVATIONS:
Min. Elev.= 847.00 ft
Increment = .50 ft
Max. Elev.= 853.00 ft
*:****************************.***s****s**.***
OUTLET CONNECTIVITY
~r~*****:***t***~***~*«*~******~~*******~******
---> Forward
<--- Reverse
<---> Forward
----Structure
User Defined Table
TW SETUP, DS Channel
Flow
Flow
and
Nod
ST
Page 7.01
Only (Upstream to DnStream)
Only (DnStream to Upstream)
teverse Both Allowed
Outfall --E1_-ft- --E2_-ft
---> TW .000 853.000
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

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S/N: 621605606A8F
PondPack Ver. 7.5 (765)
Type.... Outlet Input Data
Name.... OUTLET DEVICE
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Title... Outlet Structure
OUTLET STRUCTURE INPUT DATA
Structure ID = ST
Structure Type = User Defined Table
------------------------------------
ELEV-FLOW RATING TABLE
Elev, ft Flow, cfs
847.00 .00
847.so .a7
848.00 .10
848.50 .12
849.00 .15
849.50 3.35
850.00 9.18
850.50 16.73
851.00 25.66
851.50 36.22
852.00 66.37
852.50 102.07
853.00 142.56
Structure ID = TW
Structure Type = TW SETUP, DS Channel
FREE OUTFACE CONDITIONS SPECIFIED
CONVERGENCE TOLERANCES...
Maximum Iterations= 30
Min. TW tolerance = .01 ft
Max. TW tolerance = .01 ft
Min. HW tolerance = .01 ft
Max. HW tolerance = .01 ft
Min. Q tolerance = .10 cfs
Max. Q tolerance = .10 cfs
Page 7.02
CPT Engineering & Surveying, Inc.
Compute Time: 16:02:09 Date: 04/16/2007
1

Type.... Pond E-V-Q Table Page 8.01
Name.... POND #1
File.... F:\PROJECTS\424-04\CAL CS\POND1-POST.PPW
LEVEL POOL ROUTING DATA
HYG Dir =
Inflow HYG file = F:\PROJECTS
P1-POST.HYG \424-04\CALCS\
- POND #1
IN
Dev.10
Outflow HYG file = P1-POST.HYG - POND #1 OUT Dev.10
Pond Node Data =
Pond Volume Data = POND #1
POND #1
Pond Outlet Data = OUTLET DEVI CE
No Infiltration
INITIAL CONDITIONS
-------------------
Starting WS Elev -----------
847.00 ----
ft
Starting Volume .000 ac-ft
Starting Outflow = .00 cfs
Starting Infiltr. _ .00
Starting Total Qout= .00 cfs
cfs
Time Increment .0167 hrs
Elevation Outflow
cfs
ft Storage
ac_ft Area Infilt.
cfs
acres Q Total
cfs 25/t + 0
cfs
----
-
---------
----
847.00 .00 ---
---
.000 --
---
-----
.2850 -
-
.00 ------
----
---
.00 ---
-
-
.00
847.50 .07 .145 .2969 .00 .07 210.86
848.00 .10 .297 .3090 .00 .10 430.37
848.50 .12 .454 .3209 .00 .12 658.57
849.00 .15
849.50 3.35 .618
.787 .3330
.3454 .00
.00 .15
3.35 895.47
1144.42
850.00 9.18 .963 .3580 .00 9.18 1405.06
850.50 16.73 1.145 .3704 .00 16.73 1676.49
851.00 25.66
851.50 36.22 1.334
1.528 .3831
.3959 .00
.00 25.66
36.22 1958.38
2251.14
852.00 66.37 1.730 .4090 .00 66.37 2572.89
852.50 102.07 1.938 .4224 .00 102.07 2909.77
853.00 142.56 2.152 .4360 .00 142.56 3261.22
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5/N: 621605B06A8F CPT Engineering & Surveying. Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Pond Routing Summary
Name.... POND #1 OUT Tag: Dev.10
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Storm... TypeII 24hr Tag: Dev.10
LEVEL POOL ROUTING SUMMARY
HYG Dir = F:\PROJECTS\424-04\CALCS\
Inflow HYG file = P1-POST.HYG - POND #1 IN Dev.10
Outflow HYG file = P1-POST.HYG - POND #1 OUT Dev.10
Pond Node Data = POND #1
Pond Volume Data = POND #1
Pond Outlet Data = OUTLET DEVICE
No Infiltration
INITIAL CONDITIONS
Starting WS Elev = 847.00 ft
Starting Volume = .000 ac-ft
Starting Outflow
Starting Infiltr. .00 cfs
.00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0167 hrs

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TNFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow = 50.31 cfs at 11.9238 hrs
Peak Outflow = 20.13 cfs at 12.0741 hrs
-------
----
Peak --------------
Elevation -----------
= 850.69 -----------------
ft
Peak _Storage===_=_ _=====1_216 _ac_ft__________________
MASS BALANCE (ac-ft)
-------------
+ Initial Vol -------------
= .000
+ HYG Vot IN = 2.706
- Infiltration = .000
- HYG Vol OUT = 2.248
- Retained Vol = .458
Unrouted Vot = -.000 ac-ft
(.0039K of Inflow Volume)
Page 8.02
Event: 10 yr
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Pond Routing Summary
Name.... POND #1 OUT Tag: Dev100
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Storm... TypeII 24hr Tag: Dev100
LEVEL POOL ROUTING SUMMARY
' HYG Dir = F:\PROJECTS\424-04\CALCS\
~ Inflow HYG file = P1-POST.HYG - POND #1 IN Dev100
Outflow HYG file = P1-POST.HYG - POND #1 OUT Dev100
Pond Node Data = POND #1
Pond Volume Data = POND #1
Pond Outlet Data = OUTLET DEVICE
No Infiltration
INITIAL CONDITIONS
Starting WS Elev = 847.00 ft
Starting Volume = .000 ac-ft
Starting
Starting Outflow
Infiltr. .00
.00 cfs
cfs
Starting Total Qout= .00 cfs
Time Inc rement = .0167 hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow = 82.11 cfs at 11.9238 hrs
Peak Outflow = 57.02 cfs at 12.0240 hrs
-
----
----
Peak --------------
Elevation -----------
= 851.85 -
------------------
ft
Peak Storage = 1.667 ac-ft
~`~ MASS BALANCE (ac-ft)
+ Initial Vol = .000
+ HYG Vol IN = 4.521
- Infiltration = .000
- HYG Vol OUT = 4.045
- Retained Vot = .476
Unrouted Vol = - 000 ac-ft
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Page 8.03
Event: 100 yr
(.008% of Inflow Volume)
5/N: 621605606ASF CPT Engineering & Surveying, Tnc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007
r

Appendix A
Index of Starting Page Numbers for ID Names
----- H -----
HP Storms... 3.01
----- 0 -----
OUTLET DEVICE... 7.01
----- P -----
POND #1... 6.01, 8.01, 8.02, 8.03
POND #1 (POST)... 5.01, 4.01, 4.03
----- W -----
Watershed... 1.01, 2.01, 2.02
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A-1
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16!2007

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WET DETENTION POND DESIGN
WET DETENTION POND #1

i

POND VOLUMES
PERMANENT WATER QUALITY SURFACE AREA
TEMPORARY WATER QUALITY STORAGE PROVIDED
s

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__------ MC~dr ts~~ . Cc~-~
~2 ~.'~~° 'L~Z
8d~3 3l~ 3S~S
Qd~ ~4c~ 1~3-
$~~ ss~~

WET DETENTION POND DESIGN
WET DETENTION POND #2
PRE-DEVELOPMENT
HYDROLQGIC ANALYSIS

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Table of Contents
Table of Contents

********************** MASTER SUMMARY **********************
Watershed....... Master Network Summary ............. 1.01
*************** NETWORK SUMMARIES (DETAILED) ***************
Watershed....... Pre.10
Executive Summary (Nodes) .......... 2.01
Watershed....... Pre100
Executive Summary (Nodes) .......... 2.02
********************** RAINFALL DATA ******s****************
TypeII 24hr.... Pre.10
Synthetic Cumulative Depth ......... 3.01
TypeII 24hr.... Pre100
Synthetic Cumulative Depth ......... 3.03
**************s*s***** TC CALCULATIONS *********************
TC (PRE)........ Tc Catcs ........................... 4.01
********************** CN CALCULATIONS *********************
POND #2 (PRE)... Runoff CN-Area ..................... 5.01
******************** RUNOFF HYDROGRAPHS ********************
PRE-DEV......... Pre.10
SCS Unit Hyd. Summary .............. 6.01
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

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Table of Contents
Table of Contents (continued)
ii
PRE-DEV......... Pre100
SCS Unit Hyd. Summary .............. 6.02
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

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Type.... Master Network Summary Page 1.01
Name.... Watershed
File.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
MASTER DESIGN STORM SUMMARY
Default Network Design Storm File, ID HP.RNQ HP Storms
Total
Depth Rainfall
Return Event in Type RNF Fite RNF ID
------------ ------ ---------------- -------- ----------------
Pre.10 5.1000 Synthetic Curve SCSTYPES TypeII 24hr
Pre100 7.5000 Synthetic Curve SCSTYPES TypeII 24hr
MASTER NETWORK SUMMARY
SCS Unit Hydrograph Method
(*Node=Outfall; +Node=Diversion;)
(Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt)
Return HYG Vot
Storage
Node ID
------------- Type
---- ---- Event
------ ac-ft Trun
---------- --
*OUTLET JCT 10 2.501
*OUTLET JCT 100 4.409
PRE-DEV AREA 10 2.501
PRE-DEV AREA 100 4.409
Max
Qpeak Qpeak Max WSEL Pond
hrs
--------- cfs ft ac-ft
-------- -------- ---------
12.1910 24.24
12.1910 42.77
12.1910 24.24
12.1910 42.77
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

Type.... Executive Summary (Nodes) Page 2.01
Name.... Watershed Event: 10 yr
File.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
' Storm... TypeII 24hr Tag: Pre.10
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR~Left & Rt)
DEFAULT Design Storm File,ID = HP.RNQ HP Storms
Storm Tag Name = Pre.10
Description: 10-Year, 24-Hour
--------------------------------------------------------------------
Data Type, File, ID = Synthetic Storm SCSTYPES.RNF TypeII 24hr
Storm Frequency = 10 yr
Total Rainfall Depth= 5.1000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs
HYG Vol Qpeak Qpeak Max WSEL
Node ID Type ac-ft Trun. hrs cfs ft
----------------- ---- ---------- -- --------- -------- ---------
Outfall OUTLET JCT 2.501 12.1910 24.24
PRE-DEV AREA 2.501 12.1910 24.24
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

Type.... Executive Summary (Nodes} Page 2.02
Name.... Watershed Event: 100 yr
File.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
' Storm... TypelI 24hr Tag: Pre100
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
DEFAULT Design Storm File,ID = HP.RNQ HP Storms
t

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Storm Tag Name = Pre100
Description: 100-Year, 24-Hour
--------------------------------------------------------------------
Data Type, Fite, ID = Synthetic Storm SCSTYPES.RNF TypeII 24hr
Storm Frequency = 100 yr
Total Rainfall Depth= 7.5000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs
HYG Vol Qpeak Qpeak Max WSEL
-Node-ID-------_- Type ---ac_ft--Trun_--hrs-_- --cfs--- ---ft----
Outfall OUTLET JCT 4.409 12.1910 42.77
PRE-DEV AREA 4.409 12.1910 42.77
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

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Type.... Synthetic Cumulative Depth Page 3.01
Name.... TypeII 24hr Tag: Pre.10 Event: 10 yr
Fite.... C:\HAESTAD\PPKW\RAINFALL\SCSTY PES.RNF
Title... 10-Year, 24-Hour
Storm... TypeII 24hr Tag: Pre.10
CUMULATIVE RAINFALL DEPTHS (in)
Time ~ Output Time incr ement = .1000 hrs
hrs ~ Ti me on left represents time for first value in each row.
.0000 ~ .0000 .0052 .0103 .0156 .0208
.5000 ~ .0262 .0315 .0370 .0424 .0480
1.0000 ~ .0536 .0592 .0649 .0706 .0764
1.5000 ~ .0823 .0881 .0941 .1001 .1061
2.0000 ~ .1122 .1184 .1245 .1308 .1371
2.5000 ~ .1435 .1498 .1563 .1628 .1694
3.0000 ~ .1760 .1826 .1893 .1961 .2029
3.5000 ~ .2098 .2166 .2236 .2306 .2377
4.0000 ( .2448 .2520 .2593 .2667 .2742
4.5000 ~ .2818 .2895 .2973 .3052 .3132
5.0000 ~ .3213 .3295 .3378 .3462 .3548
5.5000 ~ .3634 .3721 .3809 .3898 .3989
6.0000 ~ .4080 .4172 .4266 .4360 .4455
6.5000 ~ .4552 .4649 .4748 .4847 .4948
7,0000 ~ .5049 .5152 .5255 .5360 .5465
7.5000 ~ .5572 .5679 .5788 .5898 .6008
8.0000 ~ .6120 .6235 .6355 .6480 ,6610
8.5000 ~ .6745 .6885 .7030 .7181 .7336
9.0000 ~ .7497 .7660 .7823 .7987 .8150
9.5000 ~ .8313 .8480 .8656 .8839 .9031
10.0000 ~ .9231 .9441 .9663 .9898 1.0145
10.5000 ~ 1.0404 1.0679 1.0975 1.1291 1.1628
11.0000 ~ 1.1985 1.2377 1.2817 1.3307 1.3845
11.5000 ~ 1.4433 1.5649 1.8072 2.1970 2.8961
12.0000 ~ 3.3813 3.4780 3.5631 3.6365 3.6983
12.5000 ~ 3.7485 3.7915 3.8319 3.8697 3.9048
13.0000 ~ 3.9372 3.9676 3.9966 4.0241 4.0502
13.5000 ~ 4.0749 4.0984 4.1208 4.1422 4.1626
14.0000 ~ 4.1820 4.2007 4.2190 4.2370 4.2546
14.5000 ~ 4.2719 4.2888 4.3054 4.3215 4.3374
15.0000 ~ 4.3529 4.3680 4.3827 4.3972 4.4112
15.5000 ~ 4.4249 4.4382 4.4512 4.4638 4.4761
16.0000 ~ 4.4880 4.4997 4.5112 4.5226 4.5339
16.5000 ~ 4.5451 4.5561 4.5670 4.5778 4.5884
17.0000 ~ 4.5989 4.6093 4.6196 4.6297 4.6397
17.5000 ~ 4.6496 4.6594 4.6690 4.6785 4.6879
18.0000 ~ 4.6971 4.7062 4.7152 4.7241 4.7328
18.5000 ~ 4.7414 4.7499 4.7582 4.7665 4.7746
19.0000 ~ 4.7825 4.7904 4.7981 4.8057 4.8131
19.5000 ~ 4.8205 4.8277 4.8347 4.8417 4.8485
20.4000 ( 4.8552 4.8618 4.8684 4.8750 4.8815
20.5000 ~ 4.8880 4.8945 4.9010 4.9074 4.9139
21.0000 ~ 4.9202 4.9266 4.9329 4.9392 4.9455
21.5000 j 4.9518 4.9580 4.9642 4.9704 4.9766
22.0000 ~ 4.9827 4.9888 4.9949 5.0010 5.0070
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

Type....
Name.... Synthetic Cumulative Depth
TypelI 24hr Tag: Pre.10 Page 3.02
Event: 10 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
' Title...
Storm... 10-Year, 24-Hour
TypeII 24hr Tag: Pre.10
CUMULATIVE RAINFALL DEPT HS (in)
Time ~ Output Time increment = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
22.5000
23.0000 ~ 5.0130 5.0190 5.0249
~ 5.0426 5.0485 5.0543 5.0308
5.0601 5.0368
5.0659
23.5000 ~ 5.0716 5.0774 5.0831 5.0887 5.0944
24.0000 ~ 5.1000

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S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007
1

Type.... Synthetic Cumulative Depth
Name.... TypeII 24hr Tag: Pre100 Page 3.03
Event: 100 yr
File.... C:\HAE STAD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 100-Ye
Storm... TypelI ar, 24-Hour
24hr Tag:
Pre100
CUMUL ATIVE RAINF ALL DEPTHS (in )
Time ~ Outpu t Time incr ement = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
.0000 ~
.5000 ~ .0000
.0385 .0076
.0464 .0152
.0544 .0229
.0624 .0306
.0706
1.0000 ~ .0788 .0871 .0954 .1039 .1124
1.5000 ~ .1210 .1296 .1384 .1472 .1561
' 2.0000 ~
2.5000 ~ .1650
.2110 .1741
.2204 .1832
.2299 .1924
.2394 .2016
.2491
3.0000 ~ .2588 .2686 .2784 .2884 .2984
3.5000 ~ .3085 .3186 .3289 .3392 .3496
4.0000 ~ .3600 .3706 .3813 .3922 .4032
4.5000 ~ .4144 .4257 .4372 .4488 .4606
5.0000 ~ .4725 .4846 .4968 .5092 .5217
5.5000 ~
6.0000 ~ .5344
.6000 .5472
.6136 .5602
.6273 .5733
.6412 .5866
.6552
6.5000 ~ .6694 .6837 .6982 .7128 .7276
7.0000 ~ .7425 .7576 .7728 .7882 .8037
7.5000 ~
8.0000 ~ .8194
.9000 .8352
.9169 .8512
.9345 .8673
.9529 .8836
.9720
8.5000 ( .9919 1.0125 1.0339 1.0560 1.0789
9.0000 ~ 1.1025 1.1265 1.1505 1.1745 1.1985
9.5000 ~
10.0000 ~ 1.2225
1.3575 1.2471
1.3884 1.2729
1.4211 1.2999
1.4556 1.3281
1.4919
10.5000 ~ 1.5300 1.5705 1.6140 1.6605 1.7100
11.0000 ~ 1.7625 1.8201 1.8849 1.9569 2.0361
11.5000 ~ 2.1225 2.3013 2.6577 3.2309 4.2590
12.0000 ~ 4.9725 5.1147 5.2398 5.3478 5.4387
12.5000 ~ 5.5125 5.5758 5.6352 5.6907 5.7423
13.0000 ~
13.5000 ~ 5.7900
5.9925 5.8347
6.0270 5.8773
6 0600 5.9178
6.0915 5.9562
6.1215
14.0000 { 6.1500 6.1775 6.2045 6.2309 6.2568
14.5000 ( 6.2822 6.3071 6.3314 6.3552 6.3785
15.0000 ~
15.5000 ~ 6.4013
6.5072 6.4235
6.5268 6.4452
6.5459 6.4664
6.5645 6.4871
6.5825
16.0000 ~ 6.6000 6.6172 6.6341 6.6509 6.6675
16.5000 ~ 6.6839 6.7001 6.7162 6.7320 6.7477
17.0000 ~ 6.7631 6.7784 6.7935 6.8084 6.8231
17.5000 ~ 6.8377 6.8520 6.8662 6.8801 6.8939
18.0000 ~ 6.9075 6.9209 6.9341 6.9472 6.9600
' 18.5000 ~
19.0000 ~ 6.9727
7.0331 6.9851
7.0447 6.9974
7.0560 7.0095
7.0672 7.0214
7.0781
19.5000 ~ 7.0889 7.0995 7.1099 7.1201 7.1302
20.0000 ~ 7.1400 7.1498 7.1594 7.1691 7.1787
20.5000 ~
21.0000 ~ 7.1883
7.2356 7.1978
7.2450 7.2074
7.2543 7.2168
7.2636 7.2263
7.2728
21.5000 ~ 7.2821 7.2912 7.3004 7.3094 7.3185
22.0000 ~ 7.3275 7.3365 7.3454 7.3544 7.3632

5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

Type....
Name.... Synthetic Cumulative Depth
TypeII 24hr Tag: Pre100 Page 3.04
Event: 100 yr
Fite.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
' Title...
Storm... 100-Year, 24-Hour
TypeII 24hr Tag: Pre100
CUMULATIVE RAINFALL DEPTHS (in)
Time ~ Output Time increment = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
22.5000
23.0000 ~ 7.3721 7.3808 7.3896
~ 7.4156 7.4243 7.4328 7.3983
7.4414 7.4070
7.4498
23.5000 ~ 7.4583 7.4667 7.4751 7.4834 7.4918
24.0000 ~ 7.5000

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S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007
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Type.... Tc Calcs Page 4.01
Name.... TC (PRE)
Fite.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
Title... Tc (Pre)
TIME OF CONCENTRATION CALCULATOR
................................
Tc (Pre)
--------------------------------
Segment #1:
Description:
Mannings n
Hydraulic Le
2yr, 24hr P
Slope
Tc: TR-55 Sheet
Sheet Ftow
.4000
ngth 184.00 ft
3.5000 in
.027000 ft/ft
Avg.Velocity .10 ft/sec
Segment #1 Time: .4943 hrs
Segment #2: Tc: TR-55 Shallow
Description: Shallow Conc Ftow
Hydraulic Length 512.00 ft
Slope .049000 ft/ft
Unpaved
Avg.Velocity 3.57 ft/sec
Segment #2 Time: .0398 hrs
------------------------------------------------------------------------
Total Tc: .5342 hrs
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

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Type.... Tc Calcs Page 4.02
Name.... TC (PRE)
File.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
Title... Tc (Pre)
Tc-Equations-used___
___= SCS TR-55 Sheet Ftow ______________________________________________
Tc = (.007 * ((n * Lf)**0.8)) / ((P**.S) * (Sf**.4))
Where: Tc = Time of concentration, hrs
n = M~nnings n
Lf = Flow Length, ft
P = 2yr, 24hr Rain depth, inches
Sf = Slope, ft/ft
___= SCS TR-55 Shattow Concentrated Ftow _______________________________
Unpaved surface:
V = 16.1345 * (Sf**0.5)
Paved surface:
V = 20.3282 * (Sf**0.5)
Tc = (Lf / V) / (3600sec/hr)
Where: V =Velocity, ft/sec
Sf = Slope, ft/ft
Tc = Time of concentration, hrs
Lf = Flow length, ft
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

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Type.... Runoff CN-Area Page 5.01
Name.... POND #2 (PRE)
File.... F:\PROJECTS\424-04\CALCS\POND2- PRE.PPW
Title... Pond #2: (Pre-developed)
RUNOFF CURVE NUMBER DATA
Pond #2: (Pre-developed)
----------------------------------
------
---------
-------------------------
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres 96C %UC CN
Woods good hydrologic condition 70 4.830 70.00
Grass, good hydrologic condition 74 3.300 74.00
Impervious Areas 98 2.600 98.00
COMPOSITE AREA & WEIGHTED CN ---> 10.730 78.01 (78)
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

Type.... SCS Unit Hyd. Summary Page 6.01
Name.... PRE-DEV Tag: Pre.10 Event: 10 yr
File.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
' Storm... TypeII 24hr Tag: Pre.10
SCS UNIT HYDROGRAPH METHOD
STORM EVENT: 10 year storm
Duration = 24.0000 hrs Rain Depth = 5.1000 in
Rain Dir = C:\HAESTAD\PPKW\RAINFALL\
Rain File -ID = SCSTYPES.RNF - TypeII 24hr
' Unit Hyd Type = Default Curvilinear
HYG Dir = F:\PROJECTS\424-04\CALCS\
HYG Fite - ID = P2-PRE.HYG - PRE-DEV Pre.10
Tc = .5342 hrs
Drainage Area = 10.730 acres Runoff CN= 78
____________________________________________
Computational Time Increment .07122 hrs
Computed Peak Time 12.1787 hrs
Computed Peak Ftow = 24.31 cfs
Time Increment for HYG File = .0167 hrs
Peak Time, Interpolated Output = 12.1909 hrs
Peak Flow, Interpolated Output = 24.24 cfs
DRAINAGE AREA
ID:Pond #2 (Pre)
CN 78
Area = 10.730 acres
S = 2.8205 in
0.25 = .5641 in
Cumulative Runoff
-------------------
2.7968 in
2.501 ac-fit
HYG Volume... 2.501 ac-ft (area under HYG curve)
***** UNIT HYDROGRAPH PARAMETERS *****
Time Concentration, Tc = .53416 hrs (ID: Tc (Pre))
Compu tational Incr, Tm = .07122 hrs = 0. 20000 Tp
Unit Hyd. Shape Fact or = 483.432 (37.46% under rising limb)
K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr/Tp))
Reced ing/Rising, Tr/ Tp = 1.6698 (solved from K = .7491)
Unit peak, qp = 22.76 cfs
Unit peak time Tp = .35610 hrs
Unit receding limb, Tr = 1.42442 hrs
Total unit time, Tb = 1.78052 hrs
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

Type.... SCS Unit Hyd. Summary Page 6.02
Name.... PRE-DEV Tag: Pre100 Event: 100 yr
File.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
Storm... TypeII 24hr Tag: Pre100
SCS UNIT HYDROGRAPH METHOD
STORM EVENT: 100 year storm
Duration = 24.0000 hrs Rain Depth = 7.5000 in
Rain Dir = C:\HAESTAD\PPKW\RAINFALL\
Rain File -ID = SCSTYPES.RNF - TypeII 24hr
Unit Hyd Type = Default Curvilinear
HYG Dir = F:\PROJECTS\424-04\CALCS\
HYG Fite - ID = P2-PRE.HYG - PRE-DEV Pre100
Tc = .5342 hrs
Drainage Area = 10.730 acres Runoff CN= 78
Computational Time Increment .07122 hrs
Computed Peak Time 12.1787 hrs
Computed Peak Flow = 42.95 cfs
Time Increment for HYG Fite = .0167 hrs
Peak Time, Interpolated Output = 12.1909 hrs
Peak Ftow, Interpolated Output = 42.77 cfs
DRAINAGE AREA
ID:Pond #2 (Pre)
CN = 78
Area = 10.730 acres
S = 2.8205 in
0.25 = .5641 in
Cumulative Runoff
-------------------
4.9308 in
4.409 ac-ft
HYG Volume... 4.409 ac-ft (area under HYG curve)
***** UNIT HYDROGRAPH PARAMETERS *****
Time Concentration, Tc = .53416 hrs (ID: Tr (Pre))
Computational Incr, Tm = .07122 hrs = 0.20000 Tp
Unit Hyd. Shape Factor = 483.432 (37.46% under rising limb)
K = 483.43/645.333, K = .7491 (also, K = 2/(1+(Tr1Tp))
Receding/Rising, Tr/ Tp = 1.6698 (solved from K = .7491)
Unit peak, qp = 22.76 cfs
Unit peak time Tp = .35610 hrs
Unit receding limb, Tr = 1.42442 hrs
Total unit time, Tb = 1.78052 hrs
5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

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Appendix A
Index of Starting Page Numbers for ID Names
-- P --
POND #2 (PRE)... 5.01
PRE-DEV Pre.10... 6.01, 6.02
-- T --
TC (PRE)... 4.01, 3.01, 3.03
Watershed... 1.01, 2.01, 2.02
A-1
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007

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WET DETENTION POND DESIGN
WET DETENTION POND #2

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N

DISCHARGE FOR OVERFLOW WEIR
STAGE
-
Project: Alexandria Park Apartments
Location: Wet Detention Pond #2
NC Hwy 68 8 Whites Mill R oad
High Point, N.C.
Developer: Blue Ridge Companies
,, Input Data:
Overflow Wei r #1 Overflow Weir #2
Cw= 3.00 in. Cw= 3.00 in.
Elev.= 849 Spillway crest Elev.= 850.5 Spillway crest
L= 3 ft., Weir length L= 12 ft., Weir length
t if
Water Quality ice)
Release (or
D= 2.5 in.
Elev.= 847 Invert elev. of release
Cd= 0.60 Orifice Coefficient
Emergency S pillway Dam Overtopp ing
Cw= 3.00 in. Cw= 3.00 in.
Elev.= 0 Emerg. spillway crest Elev.= 853 Top of dam
L= 0 ft., Weir length L= 237 ft., Weir length
Stage Increment 0.50 ft.

1 2 3 4 5 6 7 8 9
Stage WQ Weir #1 Weir #2 Combined Principal Emergency Dam Total
release Weir Spillway Spillway Overtopping Outflow

847.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
' 847.50 0.10 0.00 0.00 0.00 0.10 0.00 0.00 0.10
848.00 0.16 0.00 0.00 0.00 0.16 0.00 0.00 0.16
848.50 0.19 0.00 0.00 0.00 0.19 0.00 0.00 0.19
849.00 0.23 0.00 0.00 0.00 0.23 0.00 0.00 0.23 ~-~'
849.50 0.25 3.18 0.00 3.18 3.44 0.00 0.00 3.44
850.00 0.28 9.00 0.00 9.00 9.28 0.00 0.00 9.28
850.50 0.30 16.53 0.00 16.53 16.84 0.00 0.00 16.84
851.00 0.32 25.46 12.73 25.46 25.78 0.00 0.00 25.78
851.50 0.34 35.58 36.00 36.00 36.34 0.00 0.00 36.34
852.00 0.36 46.77 66.14 66.14 66.50 0.00 0.00 66.50
852.50 0.38 58.93 101.82 101.82 102.20 0.00 0.00 102.20
853.00 0.40 72.00 142.30 142.30 142.70 0.00 0.00 142.70
' 853.50 0.41 85.91 187.06 187.06 187.48 0.00 251.38 438.85
854.00 0.43 100.62 235.72 235.72 236.15 0.00 711.00 947.15
854.50 0.45 116.09 288.00 288.00 288.45 0.00 1306.19 1594.64
855.00 0.46 132.27 343.65 343.65 344.11 0.00 2011.01 2355.13

1

WET DETENTION POND #2
WET DETENTION POND
DESIGN ROUTING

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Table of Contents
Table of Contents
i
**:******************* MASTER SUMMARY **********************
Watershed....... Master Network Summary ............. 1.01
*************** NETWORK SUMMARIES (DETAILED) ***************
Watershed....... Dev.10
Executive Summary (Nodes) .......... 2.01
Watershed....... Dev100
Executive Summary (Nodes) .......... 2.02
****************** DESIGN STORMS SUMMARY *******************
HP Storms....... Design Storms ...................... 3.01
********************** RAINFALL DATA ***********************
TypeII 24hr.... Dev.10
Synthetic Cumulative Depth ......... 4.01
TypeII 24hr.... Dev100
Synthetic Cumulative Depth ......... 4.03
**:*********:**s****** CN CALCULATIONS :********************
POND #2 (POST).. Runoff CN-Area ..................... 5.01
*********,e************* POND VOLUMES **:********************
POND #2......... Vol: Elev-Area ..................... 6.01
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Table of Contents
Table of Contents (continued)
ii
******************** OUTLET STRUCTURES *********************
OUTLET DEVICE... Outlet Input Data .................. 7.01
*********************** POND ROUTING ***********************
POND #2......... Pond E-V-Q Table ................... 8.01
POND #2 OUT Dev.10
Pond Routing Summary ............... B.OZ
POND #2 OUT Dev100
Pond Routing Summary ............... 8.03
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Type.... Master Network Summary Page 1.01
Name.... Watershed
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
MASTER DESIGN STORM SUMMARY
Default Network Design Storm File, ID HP.RNQ HP Storms
Total
Depth Rainfall
Return Event in Type RNF File RNF ID
------------ ------ ---------------- -------- ----------------
Dev.10 5.1000 Synthetic Curve SCSTYPES TypeII 24hr
Dev100 7.5000 Synthetic Curve SCSTYPES TypeII 24hr
MASTER NETWORK SUMMARY
SCS Unit Hydrograph Method
(*Node=Outfall; +Node=Diversion;)
(Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt)
Return HYG Vol
Storage
Node ID
----------------- Type
---- Event
------ ac-ft Trun
---------- --
*OUTLET JCT 10 2.202
*OUTLET JCT 100 4.153
POND #2 IN POND 10 2.833
POND #2 IN POND 100 4.816
POND #2 OUT POND 10 2.202
1.417
POND #2 OUT POND 100 4.153
2.195
POST-DEVELOPED AREA 10 2.833
POST-DEVELOPED AREA 100 4.816
Max
Qpeak Qpeak Max WSEL Pond
hrs
--------- cfs
-------- ft ac-ft
-------- ---------
12.1409 9.85
12.0741 34.76
11.9238 53.01
11.9238 88.30
12.1409 9.85 850.04
12.0741 34.76 851.43
11.9238 53.01
11.9238 88.30
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

' Type.... Executive Summary (Nodes) Page 2.01
Name.... Watershed Event: 10 yr
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
Storm... TypeII 24hr Tag: Dev.10
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
' DEFAULT Design Storm File,ID = HP.RNQ HP Storms
Storm Tag Name = Dev.10
Description: 10-Year, 24-Hour
-----------------------------
Data Type, File, ID = Synthet ----------
ic Storm -------------
SCSTYPES.RNF ----------------
TypeII 24hr
Storm Frequency = 10 yr
Total Rainfall Depth= 5.1000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 h rs Step= .1000 hrs En d= 24.0000 hrs

Node ID
Type
--
--- HYG Vol Qpeak
ac=ft Trun. hrs Qpeak Max WSEL
cfs
ft
---------
--
-
----
Outfall OUTLET JCT -
-- -
2.202 - ---------
12.1409 ---
-------- ----
9.85
POND #2 IN POND 2.833 11.9238 53.01
POND #2 OUT POND 2.202 12.1409 9.85 850.04
POST-DEVELOPED AREA 2.833 11.9238 53.01

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SlN: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

Type.... Executive Summary (Nodes) Page 2.02
Name.... Watershed Event: 100 yr
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
' Storm... TypeII 24hr Tag: Dev100
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
i DEFAULT Design Storm File,ID = HP.RNQ HP Storms
Storm Tag Name = Dev100
Description: 100-Year, 24-Hour
Data Type, File, ID = Synthetic Storm SCSTYPES.RNF TypeII 24hr
' Storm Frequency = 100 yr
Total Rainfall Depth= 7.5000, in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs En d= 24.0000 hrs
HYG Vol Qpeak Qpeak Max WSEL
Trun. hrs
Type
ac_ft
Node
ID cfs ft
-------
-
---
-
-
-
---------
---- - -
Outfall OUTLET JCT 4.153 - ---------
12.0741 --------
-
34.76
POND #2 IN POND 4.816 11.9238 88.30
POND #2 OUT POND 4.153 12.0741 34.76 851.43
POST-DEVELOPED AREA 4.816 11.9238 88.30

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S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

' Type.... Design Storms Page 3.01
Name.... HP Storms
File.... C:\HAESTAD\PPKW\RAINFALL\HP.RNQ
Title... Alexandria Park Apartments
NC Hwy 68 & Whites Mill Road
Blue Ridge Companies, Inc.
Pond #2 (Post-developed)
DESIGN STORMS SUMMARY
Design Storm File,ID = HP.RNQ HP Storms
' Storm Tag Name = Dev.10
Description: 10-Year, 24-Hour
----------------------------------------------------------------------
Data Type. File, ID = Synthetic Storm SCSTYPES.RNF TypeII 24hr
Storm Frequency = 10 yr
Total Rainfall Depth= 5.1000 in
Duration Multiplier = 1
Resulting Duration = 24.0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs
Storm Tag Name = Dev100
Description: 100-Year, 24-Hour
----------------------------------------------------------------------
Data Type, File, ID = Synthetic Storm SCSTYPES.RNF TypeII 24hr
Storm Frequency = 100 yr
Total Rainfall Depth= 7.5000 in
Duration Multiplier = 1
Resulting Duration = 24..0000 hrs
Resulting Start Time= .0000 hrs Step= .1000 hrs End= 24.0000 hrs

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r S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7,5 (765} Compute Time: 16:17:38 Date: 04/16/2007

I~/~JC.
Name.... ~yII LIICL IL LUIIIU LdL IVC UCF.I LII
TypeII 24hr Tag: Dev.10 rd~C 9.41
Event: 10 yr
File.... C:\HAESTAD\PPK W\RAINFALL\SCSTY PES.RNF
Title... 10-Year, 24-Ho ur
Storm... TypeII 24hr Tag: Dev.10
CUMULATIVE RAINF ALL DEPT HS (in)
Time ~ Output Time incr ement = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
.0000 ~ .0000 .0052 .0103 .0156 .0208
.5000 ~ .0262 .0315 .0370 .0424 .0480
1.0000 ~ .0536 .0592 .0649 .0706 .0764
1.5000 ~ .0823 .0881 .0941 .1001 .1061
2.0000 ( .1122 .1184 .1245 .1308 .1371
2.5000 J .1435 .1498 .1563 .1628 .1694
3.0000
3.5000 ~ .1760
~ .2098 .1826
.2166 .1893
.2236 .1961
.2306 .2029
.2377
4.0000 ~ .2448 .2520 .2593 .2667 .2742
4.5000 ~ .2818 ,2895 .2973 .3052 .3132
5.0000
5.5000 ~ .3213
~ .3634 .3295
.3721 .3378
.3809 .3462
.3898 .3548
.3989
6.0000 ~ .4080 .4172 .4266 .4360 .4455
6.5000 ~ .4552 .4649 .4748 .4847 .4948
7.0000 ~ .5049 .5152 .5255 .5360 .5465
7.5000 ~ .5572 .5679 .5788 .5898 .6008
8.0000 ~ .6120 .6235 .6355 .6480 .6610
8.5000
9.0000 ~ .6745
( .7497 .6885
.7660 .7030
.7823 .7181
.7987 .7336
.8150
9.5000 ~ .8313 .8480 .8656 .8839 .9031
10.0000 ~ .9231 .9441 .9663 .9898 1.0145
' 10.5000
11.0000 ~ 1.0404
~ 1.1985 1.0679
1.2377 1.0975
1.2817 1.1291
1.3307 1.1628
1.3845
11.5000 ~ 1.4433 1.5649 1.8072 2.1970 2.8961
12.0000 ~ 3.3813 3.4780 3.5631 3.6365 3.6983
12.5000 ~ 3.7485 3.7915 3.8319 3.8697 3.9048
13.0000 ~ 3.9372 3.9676 3.9966 4.0241 4.0502
13.5000 ~ 4.0749 4.09$4 4.1208 4.1422 4.1626
14.0000 ~ 4.1820 4.2007 4.2190 4.2370 4.2546
14.5000 ~ 4.2719 4.2888 4.3054 4.3215 4.3374
15.0000 ~ 4.3529 4.3680 4.3827 4.3972 4.4112
15.5000 ~ 4.4249 4.4382 4.4512 4.4638 4.4761
16.0000
16.5000 ~ 4.4880
~ 4.5451 4.4997
4.5561 4.5112
4.5670 4.5226
4.5778 4.5339
4.5884
17.0000 ~ 4.5989 4.6093 4.6196 4.6297 4.6397
17.5000 ~ 4.6496 4.6594 4.6690 4.6785 4.6879
18.0000
18.5000 ~ 4.6971
~ 4.7414 4.7062
4.7499 4.7152
4.7582 4.7241
4.7665 4.7328
4.7746
19.0000 ~ 4.7825 4.7904 4.7981 4.8057 4.8131
19.5000 ~ 4.8205 4.8277 4.8347 4.8417 4.8485
1 20.0000 ~ 4.8552 4.8618 4.8684 4.8750 4.8815
20.5000 ~ 4.8880 4.8945 4.9010 4.9074 4.9139
21.0000 ~ 4.9202 4.9266 4.9329 4.9392 4.9455
' 21.5000
22.0000 ~ 4.9518
~ 4.9827 4.9580
4.9888 4.9642
4.9949 4.9704
5.0010 4.9766
5.0070
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5/N: 621605B06A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying. Inc.
Compute Time: 16:17:38 Date: 04/16/2007

Type.... Synthetic Cumulative Depth Page 4.02
Name.... TypeII 24hr Tag: Dev.10 Event: 10 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title...
Storm... 10-Year, 24-Hour
TypeII 24hr Tag: Dev.10
CUMULATIVE RAINFALL DEPT HS (in)
Time ~ Output Time increment = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
22.5000 ~ 5.0130 5.0190 5.0249 5.0308 5.0368
23.0000 ~ 5.0426 5.04$5 5.0543 5.0601 5.0659
23.5000 ~ 5.0716 5.0774 5.0831 5.0887 5.0944
24.0000 ~ 5.1000

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r S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

Type.... Synthetic Cumulative Depth Page 4.03
Name.... TypeII 24hr Tag: Dev100 Event: 100 yr
File.... C:\HAESTAD\PPK W\RAINFALL\SCSTY PES.RNF
Title...
Storm... 100-Year, 24-H
TypeII 24hr our
Tag: Dev100
CUMULATIVE RAINF ALL DEPT HS (in)
Time ~ Output Time incr ement = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
' .0000
.5000 ~ .0000
~ .0385 .0076
.0464 .0152
.0544 .0229
.0624 .0306
.0706
1.0000 ~ .0788 .0871 .0954 .1039 .1124
1.5000 ~ .1210 .1296 .1384 .1472 .1561
2.0000
2.5000 ~ .1650
~ .2110 .1741
.2204 .1832
.2299 .1924
.2394 .2016
.2491
3.0000 ~ .2588 .2686 .2784 .2884 .2984
3.5000 ~ .3085 .3186 .3289 .3392 .3496
4.0000 ~ .3600 .3706 .3813 .3922 .4032
4.5000 ~ .4144 .4257 .4372 .4488 .4606
5.0000 ~ .4725 .4846 .4968 .5092 .5217
5.5000
6.0000 ~ .5344
~ .6000 .5472
.6136 .5602
.6273 :5733
.6412 .5866
.6552
6.5000 ( .6694 .6837 .6982 7128 .7276
7.0000 ~ .7425 .7576 .7728 .7882 .8037
' 7.5000
8.0000 ~ .8194
~ .9000 .8352
.9169 .8512
.9345 .8673
.9529 .8836
.9720
8.5000 ~ .9919 1.0125 1.0339 1.0560 1.0789
9.0000 ~ 1.1025 1.1265 1.1505 1.1745 1.1985
9.5000 ~ 1.2225 1.2471 1.2729 1.2999 1.3281
10.0000 ~ 1.3575 1.3884 1.4211 1.4556 1.4919
10.5000 ~ 1.5300 1.5705 1.6140 1.6605 1.7100
11.0000
11.5000 ~ 1.7625
~ 2.1225 1.8201
2.3013 1.8849
2.6577 1.9569
3.2309 2.0361
4.2590
12.0000 ~ 4.9725 5.1147 5.2398 5.3478 5.4387
12.5000 ~ 5.5125 5.5758 5.6352 5.6907 5.7423
13.0000
13.5000 ~ 5.7900
~ 5.9925 5.8347
6.0270 5.8773
6.0600 5.9178
6.0915 5.9562
6.1215
14.0000 ~ 6.1500 6.1775 6.2045 6.2309 6.2568
14.5000 ~ 6.2822 6.3071 6.3314 6.3552 6.3785
15.0000
15.5000 ~ 6.4013
~ 6.5072 6.4235
6.5268 6.4452
6.5459 6.4664
6.5645 6.4871
6.5825
16.0000 ~ 6.6000 6.6172 6.6341 6.6509 6.6675
16.5000 ~ 6.6839 6.7001 6.7162 6.7320 6.7477
17.0000 ( 6.7631 6.7784 6.7935 6.$084 6.8231
17.5000 ~ 6.8377 6.8520 6.8662 6.8801 6.8939
18.0000 ~ 6.9075 6.9209 6.9341 6.9472 6.9600
18.5000
19.0000 ~ 6.9727
~ 7.0331 6.9851
7.0447 6.9974
7.0560 7.0095
7.0672 7.0214
7.0781
19.5000 ~ 7.0889 7.0995 7.1099 7.1201 7.1302
20.0000 ~ 7.1400 7.1498 7.1594 7.1691 7.1787
' 20.5000
21.0000 ~ 7.1883
~ 7.2356 7.1978
7.2450 7.2074
7.2543 7.2168
7.2636 7.2263
7.2728
21.5000 ~ 7.2821 7.2912 7.3004 7.3094 7.3185
22.0000 ~ 7.3275 7.3365 7.3454 7.3544 7.3632

S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

Type.... Synthetic Cumulative Depth Page 4.04
Name.... TypeII 24hr Tag: Dev100 Event: 100 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title...
Storm... 100-Year, 24-Hour
TypeII 24hr Tag: Dev100
CUMULATIVE RAINFALL DEPT HS (in)
Time ~ Output Time increment = .1000 hrs
hrs ~ Time on left represents time for first value in each row.
22.5000
23.0000 ~ 7.3721 7.3808 7.3896
~ 7.4156 7.4243 7.4328 7.3983
7.4414 7.4070
7.4498
23.5000 ~ 7.4583 7.4667 7.4751 7.4834 7.4918
24.0000 ~ 7.5000
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5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Type.... Runoff CN-Area Page 5.01
Name.... POND #2 (POST)
File.... F:\PROJECTS\424-04\CALCS\POND2- POST.PPW
Title... Pond #2 (Post-developed)
RUNOFF CURVE NUMBER DATA
Pond #2 (Post-developed)
----------------------------------------
---------
-------------------------
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres %C %UC CN
Impervious Areas 98 6.130 98.00
Open space, good condition 61 4.600 61.00
COMPOSITE AREA & WEIGHTED CN --->
........................................
........................................ 10.730
..........
.......... 82.14 (82)
.........................
.........................
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Type.... Vol: Elev-Area Page 6.01
Name.... POND #2
Fite.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
Title... Pond #2
Elevation Planimeter Area Al+A2+sgr(A1*A2) Volume Volume Sum
(ft) (sq.in) (acres)
-
----
------- (acres)
----------------- (ac-ft)
--------- (ac-ft}
-------------
-----------
847.00 ------
---
-
----- .3780 .0000 .000 .000
$48.00 ----- .4530 1.2448 .415 .415
849.00 ----- .4910 1.4156 .472 .887
850.00 ----- .5300 1.5311 .510 1.397
852.00 ----- .6150 1.7159 1.144 2.541
853.00 ----- .6610 1.9136 .638 3.179
POND VOLUME EQUATIONS
* Incremental volume computed by the Conic Method for Reservoir Volumes.
Volume = (1/3) * (EL2-EL1) * (Areal + Areal + sq.rt.(Area1*Area2))
where: EL1, EL2 = Lower and upper elevations of the increment
Areal,Area2 =Areas computed for EL1, EL2, respectively
Volume = Incremental volume between EL1 and EL2
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Type.... Outlet Input Data Page 7.01
Name.... OUTLET DEVICE
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
Title... Outlet Structure
REQUESTED POND WS ELEVATIONS:
Min. Elev.= 847.00 ft
Increment = .50 ft
Max. Elev.= 853.00 ft
OUTLET CONNECTIVITY
**********************************s*s*********
--> Forward Flow Only (Upstream to DnStream)
<--- Reverse Flow Only (DnStream to Upstream)
<---> Forward and Reverse Both Allowed
----Structure---- No. Outfall E1, ft E2, ft
User Defined Table ST ---> TW .000 853.000
TW SETUP, DS Channel
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Type.... Outlet Input Data
Name.... OUTLET DEVICE
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
Title... Outlet Structure
OUTLET STRUCTURE INPUT DATA
Structure ID = ST
Structure Type = User Defined Table
------------------------------------
ELEV-FLOW RATING TABLE
Elev, ft Flow, cfs
--------- ---------
847.00 .00
847.50 .10
848.00 .16
848.50 .19
849.00 .23
849.50 3.44
850.00 9.28
850.50 16.84
851.00 25.78
851.50 36.34
852.00 66.50
852.50 102.20
853.00 142.70
Structure ID = TW
Structure Type = TW SETUP, DS Channel
FREE OUTFACE CONDITIONS SPECIFIED
CONVERGENCE TOLERANCES...
Maximum Iterations= 30
Min. TW tolerance = .01 ft
Max. TW tolerance = .01 ft
Min. HW tolerance = .01 ft
Max. HW tolerance = .01 ft
Min. Q tolerance = .10 cfs
Max. Q tolerance = .10 cfs
Page 7.02
SIN: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Type.... Pond E-V-Q Table Page 8.01
Name.... POND #2
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
LEVEL POOL ROUTING DATA
HYG Dir = F:\PROJECTS\424-04\CALCS\
Inflow HYG file = P1-POST.HYG - POND #2 IN Dev.10
Outflow HYG file = P1-POST.HYG - POND #2 OUT Dev.10
Pond Node Data = POND #2
Pond Volume Data = POND #2
Pond Outlet Data = OUTLET DEVICE
No Infiltration
INITIAL CONDITIONS
Starting WS Elev - 847.00 ft
Starting Volume = .000 ac-ft
Starting Outflow = .00 cfs
Starting Infiltr. - .00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0167 hrs
Elevation Outflow Storage Area Infilt. Q Total 25/t + 0
---
ft cfs ac_ft acres cfs cfs cfs
-
-------
847.00 --
-------
.00 -
---
.000 - -
.3780 ----
.00 -----
----
.00 .00
847.50 .10 .198 .4147 .00 .10 287.16
848.00 .16 .415 .4530 .00 .16 601.44
848.50 .19 .646 .4718 .00 .19 936.49
849.00 .23 .887 .4910 .00 .23 1285.30
849.50 3.44 1.137 .5103 .00 3.44 1651.24
850.00 9.28 1.397 .5300 .00 9.28 2033.94
850.50 16.84 1.667 .5507 .00 16.84 2432.97
851.00 25.78 1.948 .5717 .00 25.78 2848.50
851.50 36.34 2..239 .5932 .00 36.34 3281.03
852.00 66.50 2.541 .6150 .00 66.50 3748.86
852.50 102.20 2.854 .6378 .00 102.20 4238.39
853.00 142.70 3.179 .6610 .00 142.70 4749.38
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Type.... Pond Routing Summary
Name.... POND #2 OUT Tag: Dev.10
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
Storm... TypeII 24hr Tag: Dev.10
LEVEL POOL ROUTING SUMMARY
HYG Dir = F:\PROJECTS\424-04\CALCS\
Inflow HYG file = P1-POST.HYG - POND #2 IN Dev.10
Outflow HYG file = P1-POST.HYG - POND #2 OUT Dev.10
Pond Node Data = POND #2
Pond Volume Data = POND #2
Pond Outlet Data = OUTLET DEVICE
No Infiltration
INITIAL CONDITIONS
Starting WS Elev = 847.00 ft
Starting Volume = .000 ac-ft
Starting Outflow = .00 cfs
Starting Infiltr. _ .00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0167 hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow = 53.01 cfs at 11.9238 hrs
Peak
-- Outflow = 9.85 cfs at 12.1409 hrs
-
-
Peak --------------
Elevation ------------
= 850.04 -----------------------
ft
Peak Storage = 1.417 ac-ft
MASS BALANCE
------------- (ac-ft)
------

+ Initial Vol -------
= .000
+ HYG Vol IN = 2.833
- Infiltration = .000
- HYG Vol OUT = 2.202
- Retained Vol = .631
Unrouted Vol = -.000 ac-ft
(.010% of Inflow Volume)
Page 8.02
Event: 10 yr
S/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

Type.... Pond Routing Summary
Name.... POND #2 OUT Tag: Dev100
File.... F:\PROJECTS\424-04\CALCS\POND2-POST.PPW
Storm... TypeII 24hr Tag: Dev100
LEVEL POOL ROUTING SUMMARY
~' HYG Dir = F:\PROJECTS\424-04\CALCS\
Inflow HYG file = P1-POST.HYG - POND #2 IN Dev100
Outflow HYG file = P1-POST.HYG - POND #2 OUT Dev100
Pond Node Data = POND #2
Pond Volume Data = POND #2
Pand Outlet Data = OUTLET DEVICE
No Infiltration

INITIAL CONDITIONS

Starting WS Elev = 847.00 ft
Starting Volume = .000 ac-fit
Starting Outflow .00 cfs
Starting Infiltr. .00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0167 hrs

1

INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow - 88.30 cfs at 11.9238 hrs
Peak
---- Outflow
-
- = 34.76 cfs at 12.0741 hrs

Peak --
----------
Elevation -----------
= 851.43 ------------------------
ft
Peak Storage = 2.195 ac-ft
MASS BALANCE
-----------
- (ac-fit)
-
+ Initial Vol -------------
= .000
+ HYG Vol IN = 4.816
- Infiltration = .000
- HYG Vol OUT = 4.153
- Retained Vol = .663
Unrouted Vol = -.000 ac-ft
(.007% of Inflow Volume)
Page 8.03
Event: 100 yr
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

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Appendix A
Index of Starting Page Numbers for ID Names
----- H -----
HP Storms... 3.01
-- 0 --
OUTLET DEVICE... 7.01
----- P -----
POND #2... 6.01, 8.01, 8.02, 8.03
POND #2 (POST)... 5.01, 4.01, 4.03
----- W -----
Watershed... 1.01, 2.01, 2.02
A-1
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

i

WET DETENTION P()ND DESIGN
WET DETENTION POND #Z
r

POND VOLUMES
PERMANENT WATER QUALITY SURFACE AREA
TEMPORARY WATER QUALITY STORAGE PROVIDED

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