20070218 Ver 2_Stormwater Info_20070813

1
WATERSHED DEVELOPMENT,
STORMWATER,
AND
EROSION CONTROL CALCULATIONS
FOR
ALEXANDRIA PARK APARTMENTS
NC HWY 68 & WHITES MILL ROAD
HIGH POINT, NORTH CAROLINA
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PSG
DEVELOPER/ OWNER: ,~ , ~,P-cti ~t a E ~~~
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Blue Ridge Companies, Inc.
5826 5amet Drive
Suite 145 ,~,~,1e,,,r,
High Point, North Carolina 27265 ~`. o~CH ~ARo~~~°'~.,,
[phone] ~ ~ ~oF~s~o ~ ~=
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ee~, ~;- r ,~ ~~~
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tltiSt ~\
CPT Engineering and Surveying, Inc.
3935 Bean Jordan Place -Suite 137 • High Point, NC 27265 • Phone [phone] • F((a~~x (336)j 8~12r,-8~~7n80
AUG 1 3 2007
DENR -WATER QUALITY
WE7lANDS A,ND STOR~yATER BRANCH

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SITE LOCATION
USGS MAP
SOILS SURVEY MAP

REF: 501L SURVEY OF 501L TYPES:
GUILFORD COUNTY, NG ,R `f wacla sandy lown
UNITED 5TATE5 DEPARTMENT OFA fine sandy loon, 2 to 6 percent elopes
SOILS CONSERVATION SERVICE n fine sandy loam, 10 to la percent slopes
DECEMSER 19"
AUG 7 - 2007
DENR - WATER QUALITY
WETUINO'.Ai() STnR%V.ATER BRANCH
ENGINEERING AND 5URVEYINCG, INC. AMXANDRIA rA . APARTML-NTS
LAND DEVEL.OFMENT CONSULTING
4400 TYNIN& STREET
HIGH POINT, NORTH CAROLINA 2'1265
PHONE: [phone] - FAX: [phone]'780
SOIL SURVE"r MAP
6ULFOR7 COUN°r�, NC,
5GALE: I"=1000' (T

STORM DRAINAGE
CALCULATIONS

CPT Engineering and Surveying, Inc.
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 h r 3.50 4.44 5.10 6.04 6.77 7.50
From Eqs. Ill-(7-3), p.Ill-(4-5), Stormwater Management: vo1.1
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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~ -P NEADWQTER DEPTH FOR
HEADWATER SCALES 29,3 CONCRETE PIPE CULVERTS
r~.vlsED MAY Is~a WITH INLET CONTRa!_
BUREAU OF M7tLIC ROADti iAt1 Nq

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EROSION CONTROL CALCULATIONS
SEDIMENT BASIN DESIGN
OUTLET PROTECTION

Sediment Basin Design
Project: Alexandria Pazk Apartments Computed By: STW Date: 12/15/06
Location: High Point, N.C. Checked By: STW Revised: 02/05/07
Developer. Blue Ridge Companies, Inc.
Design Criteria: Settling Efficiency Criteria:
Design Storm 10 yr Design Storm 10 yr
Rational Runoff Coeff. 0.50 Rational Runoff Coeff. 0.50
Intensity 5.81 in/hr (Tc= 10 min.) Intensity 5.81 in/hr (Tc= 10 min.)
Weir Coefficient 2.5
Height Over Weir 1 ft
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Bottom Bottom Top Top Side- Weir
Basin Drainage Denuded Sediment Basin Width Length Depth Width Length slope Length
Number Area (Acres) Area (Acres) Volume fr. ft. ft. fr. fr. ft.
Re 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.
R 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
$52 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
3 846 5,048
848 10,667 15,715
849 12,736 11,702 27,417
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Appendices
FMS ~ 3t (~y„~
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u-~ss ~ r~~P
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Discharge (ft3/sec)
c~o. SZ.f.Bc~
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).

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8.06.3

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Kcv. 123
30
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tmp#4.txt
Culvert Calculator
Entered Data:
shape .... ................
Number of Barrels ...............
solving for .....................
Chart Number ....................
scale Number .................
Chart Description ...............
ENTRANCE
Scale Description ...............
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 ........................
Messages:
Inlet head > Outlet head.
Computing Inlet Control headwater.
Solving Inlet Equation 26.
Solving Inlet Equation 28.
Headwater: 848.8588 ft
848.8588 ft Inlet Control
0.0113 ft/ft
10.7663 fps
Page 1
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1

WET DETENTION FUND DESIGN

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1

Stormwater Management Summary
Site Area' 23.000 Ac.
Existing ISA 1.37 Ac.
Proposed ISA 9.44 Ac.
WET DETENTION POND #'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
Total ISA draining to Pond #1 6.05 Ac.
Max. ISA Per Pond Desi n4 6.28 Ac. 65.0%
WET DETEMTlO'N POND #2
On-Site D.A. to Pond #2 7.67 Ac.
Off-Site D.A. to Pond #2 3.06 Ac.
otal D.A. to Pond #2 10.73 Ac.
On-Site ISA draining to Pond #2 4.00 Ac.
Off-Site ISA drainin to Pond #Z 2.13 Ac.S
Total ISA draining to Pond #2 6.13 Ac.
Max. ISA Per Pond Design" 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 1.69 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.

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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,
1986

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 F,fficiencv in the Coastal Reeion. Adapted from Driscoll, 1986

1
1
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 3.3a 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 Basin 10-7 July 2007
1

1

1
1

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

f
1
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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 Cumutative Depth ......... 3.03
********s************* TC CALCULATIONS *********************
TC (PRE)........ Tc Catcs ........................... 4.01
********************** CN CALCULATIONS *********************
POND #1 (PRE)... Runoff CN-Area ..................... S.O1
******************** RUNOFF HYDROGRAPHS ********************
PRE-DEV......... Pre.10
SCS Unit Hyd. Summary .............. 6.01
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

Table of Contents ii
Table of Contents (continued)
PRE-DEV......... Pre100
SCS Unit Hyd. Summary .............. 6.02
~~
0
1

i~
1

1

S/N: 621605606ASF CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

1
1
i
1
~i
Type.... Master Network Summary Page 1.01
Name.... Watershed
Fite.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
MASTER DESIGN STORM SUMMARY
Defiauit 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 TypeIl 24hr
Pre100 7.5000 Synthetic Curve SCSTYPES TypeII 24hr
MASTER NETWORK SUMMARY
SCS Unit Hydrograph Method
(*Node=Outfatt; +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 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
S/N: 621605B06A8F CPT Engineering & Surveying, Tnc.
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... TypeIl 24hr Tag: Pre.10
NETWORK SUMMARY
-- NODES
(Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left & Rt)
DEFAULT Design Storm Fite,IO = HP.RNQ HP Storms
Storm Tag Name = Pre.10
Description: 10-Year, 24-Hour

' ---------------------------------------
Data Type, Fite, TD = Synthetic Storm
Storm Frequency = 10 yr -------------
SCSTYPES.RNF ----------------
TypeIl 24hr
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 Vot Qpeak
Node
ID
Type
ac=ft
Trun_
hrs Qpeak Max WSEL
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

' Type.... Executive Summary (Nodes) Page 2.02
Name.... Watershed Event: 100 yr
File.... 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 ------------
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 Vot Qpeak Qpeak Max WSEL
Node
ID
Type
ac_ft
Trun_
hrs cfs
ft
-
-
---------
---
--
Outfall OUTLET JCT 3.052 --
---
12.0240 --
--- ---
----
45.41
' PRE-DEV AREA 3.052 12.0240 45.41

1
1

S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

1

1

1
1

1

it
1
1
Type.... Synthetic Cumulative Depth Page 3.01
Name.... TypeII 24hr Tag: Pre.10 Event: 10 yr
File.... C:\HAEST AD\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 ~ Ti me on left represents time for first value in each row.
.0000 ~ -.0000 .0052 .0103 .0156 .0208
.5400 ( .0262 .0315 .0370 .0424 .0480
1.0000 ~ .0536 .0592 .0649 .0706 .0764
1.5000 ~ .0$23 .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
20.0040 ~ 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 ~ 4.9518 4.9580 4.9642 4.9704 4.9766
22.0000 ~ 4.9827 4.9888 4.9949 5.0010 5.0070
' S/N: 621605B06A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying, Inc.
Compute Time: 10:23:00 Date: 01/26/2007

' Type.... Synthetic Cumulative Depth
Name.... TypeIl 24hr Tag: Pre.10 Page 3.02
Event: 10 yr
Fite.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF

' Titte... 10-Year, 24-Hour
Storm... TypeII 24hr Tag: Pre.10
CUMULATIVE RAINFALL DEPT HS (in)
' Time ~ Output Time increment =
hrs ~ Time on left represents time for .1000 hrs
first value
in each row.
22.5000 ~- 5.0130 5.0190 5.0249
23.0000 ~ 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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5/N: 621605B06A8F 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
Fite..., C:\HAE STAD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 100-Ye ar, 24-Hour
Storm... TypeII 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 f ----- ---
.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 ~ .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 .8037
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
' S/N: 621605B06A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying, Inc.
Compute Time: 10:23:00 Date: 01/26/2007

' Type.... Synthetic Cumulative Depth
Name.... TypelI 24hr Tag: Pre100 Page 3.04
Event: 100 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
' Title... 100-Year, 24-Hour
Storm... TypeII 24hr Tag: Pre100
CUMULATIVE RAINFALL DEPT HS (in)
' Time ~ Output Time increment =
hrs ~ Time on left represents time for .1000 hrs
first value
in each row.
-
- -~-
22.5000 ~ 7.3721 7.3808 7.3896 7.3983 -
7.4070
23.0000 ~ 7.4156 7.4243 7.4328 7.4414 7.449$
23.5000 ~ 7.4583 7.4667 7.4751 7.4834 7.4918
24.0000 I 7.5000

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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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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 Flow
.1500
ngth 167.00 ft
3.5000 in
.030000 ft/ft
Avg.Velocity .23 ft/sec
Segment #1 Time: .2001 hrs
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Segment #2: Tc: TR-55 Shallow
Description: Shallow Conc Ftow
Hydraulic Length 517.00 ft
Slope .068000 ft/ft
Unpaved
Avg.Velocity 4.21 ft/sec
Segment #2 Time: .0341 hrs
------------------------------------------------------------------------
Totat Tc: .2342 hrs
5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007

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Type.... Tc Catcs Page 4.02
Name.... TC (PRE)
Fite.... 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 = Flow length, ft
P = 2yr, 24hr Rain depth, inches
Sf = Slope, ft/ft
-__= SCS TR-55 Shallow Concentrated Flow _______________________________
Unpaved surface:
V = 16.1345 * (Sf**0.5)
Paved surface:
V = 20.3282 * (Sf**O.S)
Tc = (Lf / V) / (3600sec/hr)
Where: V =Velocity, ft/sec
Sf = Slope, ft/ft
Tc =Time of concentration, hrs
Lf = Ftow length, ft
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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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
Soit/Surface Description CN acres %C %UC 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
File.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
Storm... TypeTI 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 Fite -ID = SCSTYPES.RNF - TypeIl 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
Time Increment for HYG Fite = .0167 hrs
Peak Time, Interpolated Output = 12.0239 hrs
Peak Ftow, 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-fit (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

1
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:23:00 Date: 01/26/2007
1

Type.... SCS Unit Hyd. Summary Page 6,02
Name.... PRE-DEV Tag: Pre100 Event: 100 yr
Fite.... F:\PROJECTS\424-04\CALCS\POND1-PRE.PPW
Storm... TypelI 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 - TypeIl 24hr
Unit Hyd Type = Default Curvilinear
HYG Dir = F:\PROJECTS\424-04\CALCS\
HYG Fite - ID = P1-PRE.HYG - PRE-DEV PrelO0
Tc = .2342 hrs
Drainage Area = 8.380 acres Runoff CN= 73

.03123 hrs
Computational Time Increment
~
Computed Peak Time 12.0243 hrs
Computed Peak Ftow = 45.44 cfs
Time Increment for HYG Fite - .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))
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

1
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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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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STAGE-DISCHARGE FOR OVERFLOW WEIR
Project: Alexandria Park Apartments
Location: Wet Detention Pond #1
NC Hwy 68 8 Whites Allilf Road
High Point, N.C.
Developer: Blue Ridge Companies

Input Data:
Overflow Wei r #1 Overtlow 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
f
Water Quality Release (ori
ice)
D= 2 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= 290 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
[mil [~~] [~~I [~~] [~~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

********************** 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 ***********************
TypelI 24hr.... Dev.10
Synthetic Cumulative Depth ......... 4.01
TypeII 24hr.... Dev100
Synthetic Cumulative Depth ......... 4.03
********************** CN CALCULATIONS *********************
POND #1 (POST).. Runoff CN-Area ..................... 5.01
********::************* POND VOLUMES ***********************
POND #1......... Vol: Elev-Area ..................... 6.01
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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Table of Contents
Table of Contents (continued)
ii
******************** OUTLET STRUCTURES *********************
OUTLET DEVICE... Outlet Input Data .................. 7.01
*******s*************** POND ROUTING *************s*********
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 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 2.248
*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 57.02 851.$5
11.9238 50.31
11.9238 82.11
5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Executive Summary (Nodes)
Name.... Watershed Page 2.01
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 Synthetic Storm
Storm Frequency = 10 yr SCSTYPES.RNF TypeII 24hr
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
hrs---
Trun_
ac=ft
Type
Node
ID --cfs--- ---ft----
--
---
-
---------
-
Outfalt OUTLET JCT 2.248 --
12.0741 20.13
POND #1 IN POND 2.706
POND #1 OUT POND 2.248 11.9238
12.0741 50.31
20.13 850.69
POST-DEVELOPED AREA 2.706 11.9238 50.31
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5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007
1

Type.... Executive Summary (Nodes) Page 2.02
Name.... Watershed 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 En d= 24.0000 hrs
HYG Vol Qpeak Qpeak Max WSEL
hrs---
Trun_
ac=ft
Type
ID
Node --cfs--- ---ft----
--
---
---------
-
-
Outfall OUTLET JCT 4.045 --
12.0240 57.02
POND #1 IN POND 4.521
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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S/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 Mill 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
Description: 100-Year, 24-Hour
Storm-Tag-Name--------Dev100------------------------------------------
Data Type, File, ID = Synthetic Storm SCSTYPES.RNF TypeTI 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: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:OZ:09 Date: 04/16/2007

Type.... Synthetic Cumulative Depth
Name.... TypeII 24hr Tag: Dev.10 Page 4.01
Event: 10 yr
File.... C:\HAEST AD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 10-Year,
Storm... TypeII 24-Hour
24hr Tag:
Dev.10
CUMULATIVE RAINF ALL DEPTHS (in )
Time ~ Outpu t Time incr ement = .1000 hrs
Ti
hrs
i on left
me 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 ~
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 .68$5 .7030 .71$1 .7336
9.0000 ~ .7497 .7660 .7823 .7987 .8150

I 9.5000 ~
10.0000 ~ .8313
.9231 .8480
.9441 .8656
.9663 .8839
.9898 .9031
1.0145
10.5000 ( 1.0404 1.0679 1.0975 1.1291 1.1628
11.0000 ~
11.5000 ~ 1.1985
1.4433 1.2377
1.5649 1.2817
1.8072 1.3307
2.1970 1.3845
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
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 ~ 4.9518 4.9580 4.9642 4.9704 4.9766
22.0000 ~ 4.9827 4.9888 4.9949 5.0010 5.0070

5/N: 621605B06A8F 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: Dev.10 Page 4.02
Event: 10 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title... 10-Year, 24-Hour
Storm... TypeII 24hr Tag: Dev.10
CUMULATIVE RAINFALL DEPT HS tin)
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
23.0000 ~ 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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SIN: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007
1

Type.... Synthetic Cumulative Depth
Name.... TypeII 24hr Tag: Dev100 Page 4.03
Event: 100 yr
File.... C:\HAE STAD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 100-Ye
Storm... TypeII ar, 24-Hour
24hr Tag:
Dev100
CUMULATIVE 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 {
2.0000 {
2.5000 {
3.0000 { .1210
.1650
.2110
.2588 .1296
.1741
.2204
.2686 .1384
.1832
.2299
.2784 .1472
.1924
.2394
.2884 .1561
.2016
.2491
.2984
3.5000 {
4.0000 { .3085
.3600 .3186
.3706 .3289
.3813 .3392
.3922 .3496
.4032
4.5000 {
5.0000 { .4144
.4725 .4257
.4846 .4372
.4968 .4488
.5092 .4606
.5217
5.5000 {
6.0000 {
6.5000 { .5344
.6000
.6694 .5472
.6136
.6837 .5602
.6273
.6982 .5733
.6412
.7128 .5866
.6552
.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 { 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 {
17.0000 { 6.6839
6.7631 6.7001
6.7784 6.7162
6.7935 6.7320
6.8084 6.7477
6.8231
17.5000 { 6.8377 6.8520 6.8662 6.$801 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 { 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
J
S/N: 621605B06A8F 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 Page 4.04
Event: 100 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title... 100-Year, 24-Hour
Storm... 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 ~ 7.3721 7.3808 7.3896
23.0000 ~ 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: 621605806A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007
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Type.... Runoff CN-Area Page 5.01
Name.... POND #1 (POST)
File.... F:\PROJECTS\424-04\CALCS\POND1-POST.PPW
Title... Pond #1 (Post-developed)
RUNOFF CURVE NUMBER DATA
........................
........................
Pond #1 (Post-developed)
--------------------------------------------------------------------------
Area
Soil/Surface Description CN acres
Impervious Areas 98 6.050
Open space, good condition 61 3.610
COMPOSITE AREA & WEIGHTED CN ---> 9.660
................................................
................................................
Impervious
Adjustment Adjusted
%C %UC CN
98.00
61.00
84.17 (84}
......................
......................
5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Vol: Elev-Area Page 6.01
Name.... POND #1
File.... F:\PROJECTS\42
Title... Pond #1 4-04\CALCS\POND1-POST.PPW
Elevation Planimeter Area Al+A2+sgr(A1*A2) Volume Volume Sum
(ft) (sq.in)
- (acres
-
------- ) (acres)
------------------ (ac-ft)
------- (ac-ft)
---------------
---------------------
-
847.00 -----
848.00 -
.2850
.3090 .0000
.8908 .000
.297 .000
.297
_____
849.00 .3330 .9628 .321 .618
850.00 ----- .3580 1.0363 .345 .963

~~ 852.00 -----
853.00 ----- .4090
.4360 1.1497
1.2673 .766
.422 1.730
2.152
POND VOLUME EQUATIONS
* Incremental volume computed by the Conic Metho d for R eservoir Volumes.
Volume = (1/3) * (E L2-EL1} * (Areal + Areal + sq.rt.( Area1*Area2))
..
where: EL1, EL2
= Lower
and upper elevatio
ns of t
he increment
Areal,Area2
Volume =Areas
= Incre computed for EL1,
mental volume betw EL2, r
een EL1 espectively
and EL2
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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
OUTLET CONNECTIVITY
************~******~*:*************x******~***
---> Forward
<--- Reverse
<---> Forward
----Structure
User Defined Table
TW SETUP, DS Channet
Flow
Flow
and
No_
ST
Page 7.01
Only (Upstream to DnStream)
Only (DnStream to Upstream)
2everse Bath Allowed
Outfall E1, ft E2, ft
---> TW .000 853.000
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04/16/2007

Type.... Outlet Input Data
Name.... OUTLET DEVICE
Fite.... 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
847.50 .07
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 CONDITION S 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. fl2
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:02:09 Date: 04!16/2007

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 = 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 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 Infi1C.
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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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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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 = .00 cfs
Starting Infiltr. _ .00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0167 hrs
INFLOW/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 Vol IN = 2.706
- Infiltration = .000
- HYG Vol OUT = 2.248
- Retained Vol = .458
Unrouted Vol = -.000 ac-ft
(.003 of Inflow Volume)
Page 8.02
Event: 10 yr
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.... 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 Outflow = .00 cfs
Starting Infiltr. _ .00 cfs
Starting Total Qout= .00 cfs
Time Increment = .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 Vol = .476
Unrouted Vol = -.000 ac-ft
Page 8.03
Event: 100 yr
(.008% of Inflow Volume)
' 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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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
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
POND VOLUMES
PERMANENT WATER QUALITY SURFACE AREA
TEMPORARY WATER QUALITY STORAGE PROVIDED

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WET DETENTION POND DESIGN
WET DETENTION POND #Z

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PRE-DEVELOPMENT
HYDROL(JGIC ANALYSIS

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Table of Contents
Table of Contents
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********************** 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 Calcs ........................... 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 ii
Table of Contents (continued)
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

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 Fite, ID HP.RNQ HP Storms
Total
Depth Rainfall
Return Event in Type RNF File RNF ID
------------ ------ ---------------- -------- ----------------
Pre.10 5.1000 Synthetic Curve SCSTYPES TypeI1 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 Vol
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
Fite.... F:\PROJECTS\424-04\CALCS\POND2-PRE.PPW
' Storm... TypeII 24hr Tag: Pre.10
NETWORK SUMMARY -- NODES
(Trun.= HYG Truncation: Btank=None; L=Left; R=Rt; LR=Left & Rt)
' DEFAULT Design Storm Fite,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 Rainfatt 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 Vot Qpeak Qpeak Max WSEL
Node ID Type ac-ft Trun. hrs cfs ft
----------------- ---- ---------- -- --------- -------- ---------
Outfatl 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

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Type.... Executive Summary (Nodes) Page 2.02
Name.... Watershed Event: 100 yr
Fite.... F:\PROJECTS\424-04\CALCS\POND2-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, 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
HYG Vol Qpeak Qpeak Max W5EL
-Node-ID--------- Type ---ac_ft--Trun_--hrs-~- --cfs--- ---ft----
Outfalt OUTLET JCT 4.409 12.1910 42.77
PRE-DEV AREA 4.409 12.1910 42.77
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.... Synthetic Cumulative Depth Page 3.01
Name.... TypeII 24hr Tag: Pre.10 Event: 10 yr
File.... C:\HAESTAD\PPKW\RAINFALL\SCSTY PES.RNF
Title... 10-Year, 24-Ho ur
Storm... TypeII 24hr Tag: Pre.10
CUMULATIVE RAINFALL DEPT HS (in)
Time ~ Output Time increment = .1000 hrs
hrs ~ Time on tefit 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 .9$98 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
20.0000 ~ 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 ~ 4.9518 4.9580 4.9642 4.9704 4.9766
22.0000 ~ 4.9827 4.9888 4.9949 5.0010 5.0070
S/N: 621605B06A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying, Inc.
Compute Time: 10:34:35 Date: 01/26/2007

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Type.... Synthetic Cumulative Depth Page 3.02
Name.... TypeII 24hr Tag: Pre.10 Event: 10 yr
Fite.... C:\HAESTAD\PPKW\RAINFALL\SCSTYPES.RNF
Title... 10-Year, 24-Hour
Storm... 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 ~ 5.0130 5.0190 5.0249 5.0308 5.0368
23.0000 ~ 5.0426 5.0485 5.0543 5.0601 5.0659
23.5000 ~ 5.0716 5.0774 5.0831 5.0887 5.0944
24.0000 I 5.1000
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 3.03
Name.... TypeII 24hr Tag: Pre100 Event: 100 yr
File.... C:\HAE STAD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 100-Ye ar, 24-Hour
Storm... TypeII 24hr Tag: Pre100
CUMULATIVE RAINF ALL DEPTHS (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 ~ .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 .8037
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
S/N: 621605B06A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying, Inc.
Compute Time: 10:34:35 Date: 01/26!2007
1

' Type.... Synthetic Cumulative 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: 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 Flow
Hydraulic Length 512.00 ft
Slope .049000 ft/ft
Unpaved
Avg.Vetocity 3.57 ft/sec
Segment #2 Time: .0398 hrs
------------------------------------------------------------------------
Total Tc: .5342 hrs
5/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 Catcs Page 4.02
Name.... TC (PRE)
Fite.... F:\PROJECTS\424-04\CALCS\POND2-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 = Flow length, ft
P = 2yr, 24hr Rain depth, inches
Sf = Slope, ft/ft
___= SCS TR-55 Shallow Concentrated Flow _______________________________
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
Soit/Surface Description CN acres %C %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: 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 6.01
Name.... PRE-DEV Tag: Pre.10 Event: 10 yr
Fite.... 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\RAINFAL~\
Rain File -ID = SCSTYPES.RNF - TypeII 24hr
Unit Hyd Type = Default Curvilinear
HYG Dir = F:\PROJECTS\424-04\CALCS\
HYG File - 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 Flow = 24.31 cfs
Time Tncrement for HYG Fite = .0167 hrs
Peak Time, Interpolated Output = 12.1909 hrs
Peak Flow, Interpolated Output = 24.24 cfs
_______________T=
E AREA =____________
A
DRAIN
G
-------------------
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-ft
' HYG Volume... 2.501 ac-ft (area under HYG curve)
***** UNIT HYDROGRAPH PARAMETERS *****
Time Concentration, Tc = .53416 hrs (ID: 7c (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+(Tr/Tp))
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
Totat 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.OZ
Name.... PRE-DEV Tag: Pre100 Event: 100 yr
Fite.... 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 File - ID = P2-PRE.HYG - PRE-DEV Pre100
1 Tc
Drainage Area = .5342 hrs
= 10.730 acres Runoff CN= 78

Computational .07122 hrs
Time Increment
Computed Peak _
Time 12.1787 hrs
Computed Peak Flow = 42.95 cfs

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Time Increment for HYG File = .0167 hrs
Peak Time, Interpolated Output = 12.1909 hrs
Peak Flow, 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: Tc (Pre))
Computational Incr, Tm = .07122 hrs = 0.20000 Tp
Unit Hyd. Shape Factor
K = 483.43/645.333, K 483.432
= .7491 (37.469K under rising limb)
(also, K = 2/(1+(Tr1Tp))
Receding/Rising, Tr/Tp 1.6698 (solved from K = .7491).
Unit peak, qp = 22.76 cfis
Unit peak time Tp = .35610 hrs
Unit receding limb, Tr = 1.42442 hrs
Total unit time, Tb = 1.78052 hrs

1 5/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 10:34:35 Date: 01/26/2007
1

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
----- W -----
Watershed... 1.01, 2.01, 2.02
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1 S/N: 621605606A8F
PondPack Ver. 7.5 (765)
A-1
CPT Engineering & Surveying, Inc.
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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DISCHARGE FOR OVERFLOW WEIR
STAGE-
Project: Alexandria Park Apartments
Location: Wet Detention Pond #2
NC Hwy 68 & Whites Mill Road
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
ice)
Water Quality Release (or
D= 2.5 in.
Elev.= 847 Invert elev. of release
Cd= 0.60 Orifice Coefficient
Emergency S pillway 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= 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
[ft.] [cfs] [cfs] [cfs]_ [cfs] [cfs] [cfs] Ic~l [cam]
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
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WET DETENTION POND #2
WET DETENTION POND
DESIGN ROUTING

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Table of Contents
Table of Contents
i
************s*******:* MASTER SUMMARY ***********s**********
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 *****************s***
POND #2 (POST).. Runoff CN-Area ..................... 5.01
************:********** POND VOLUMES ********:******e*******
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

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 ............... 8.02
POND #2 OUT Dev100
Pond Routing Summary
............... 8.03

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

Type.... Executive Summary (Nodes)
Name.... Watershed Page 2.01
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, Fite, ID Synthetic Storm
Storm Frequency = 10 yr SCSTYPES.RNF TypelI 24hr
_ 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
Trun. hrs
Type
ac_ft
Node ID Qpeak Max WSEL
-cfs- ft
-- ---------
--
---
-
---------------- ---- -
Outfall OUTLET JCT 2.202 - ---------
12.1409 -
9.85
POND #2 IN POND 2.833
POND #2 OUT POND 2.202 11.9238
12.1409 53.01
9.85 850.04
POST-DEVELOPED AREA 2.833 11.9238 53.01
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5/N: 621605B06A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765) Compute Time: 16:17:38 Date: 04/16/2007

Type.... Executive Summary (Nodes)
Name.... Watershed Page 2.02
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)
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 TypelI 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
hrs
ac_ft
Trunk
Type
Node
ID Qpeak Max WSEL
- ---ft----
cfs
--
---
-
-
---------
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
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 Fite,ID = HP.RNQ HP Storms
Page 3.01
Storm Tag Name = Dev.10
Description_-10_Year_-24_Hour-----------------------------------------
Data Type, File, ID = Synthetic Storm SCSTYPES.RNF TypeTI 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: 16:17:38 Date: 04/16/2007

_ __
I~/fJC JylI IIICI Il LUIIIU LdI IVC VC~.)lll
Name.... TypeII 24hr Tag: Dev.10
~"d~j'C 4.V1
Event: 10 yr
File.... C:\HAEST AD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 10-Year, 24-Hour
Storm... TypeII 24hr Tag: Dev.10
CUMUL ATIVE RAINF ALL DEPTHS (in)
Time { Outpu t 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 {
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 ~
7.5000 { .5049
.5572 .5152
.5679 .5255
.5788 .5360
.5898 .5465
.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 {
13.0000 { 3.7485
3.9372 3.7915
3.9676 3.8319
3.9966 3.8697
4.0241 3.9048
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 {
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
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

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 4.02
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
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: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 (765} Compute Time: 16:17:38 Date: 04/16/2007

Type.... Synthetic Cumulative Depth
Name.... TypeII 24hr Tag: Dev100 Page 4.03
Event: 100 yr
File.... C:\HAE STAD\PPKW\RAI NFALL\SCSTY PES.RNF
Title... 100-Ye
Storm... TypeII ar, 24-Hour
24hr Tag:
Dev100
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 ( .258$ .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 .496$ .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 ( 1.7625 1.$201 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 (
17.0000 ( 6.6839
6.7631 6.7001
6.7784 6.7162
6.7935 6.7320
6.8084 6.7477
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

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

' 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 -
Impervious Areas 98 -acres-- %C %UC
6.130 CN
98.00
Open space, good condition 61
--->
COMPOSITE AREA & WEIGHTED CN 4.600

10.730 61.00
.14 82
82 ( )
......................................... ..................... .............

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.... Vol: Elev-Area Page 6.01
Name.... POND #2
File.... 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
848.00 ----- .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) * (E L2-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 = Incre mental volume between EL1 and EL2
S/N: 621605606A8F CPT Engineering & Surveying, Inc.
PondPack Ver. 7.5 {765) Compute Time: 16:17:38 Date: 04/16/2007

Type.... Outlet Input Data Page 7.01
Name. ... OUTLET DEVICE
' File.
Title ... F:\PROJ
... Outlet ECTS\424-04\CALCS\POND2-P05T.PPW
Structure
REQUESTED POND W5 ELEVATIONS:
Min. Elev.= 847.00 ft
Increment = .50 ft
Max. Elev.= 853.00 ft
' *~*** **s****s********************~***********a
OUTLET CONNECTIVITY
***** *********~**************~****:*~*****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

' S/N: 621605B06A8F
PondPack Ver. 7.5 (765)
CPT Engineering & Surveying, Inc.
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
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.... 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 2S/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
5/N: 621605606A8F 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: 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
Starting Infiitr. .00 cfs
.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 Vot = .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: 04116/2007

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
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 88.30 cfs at 11 9238 hrs
Peak Outflow 34.76 cfs at 12.0741
-----
- hrs
----
' --
-----------------------------------------
Peak-Elevation----=----85143-ft-----------------
Peak Storage 2.195 ac-ft ----
' MASS BALANCE (ac-fit)
+ Initial Vol
' + HYG Vol IN
- Infiltration
- HYG Vol OUT
- Retained Vol
Unrouted Vol

.000
4.816
.000
4.153
.663
-.000 ac-ft (.007% of Inflow Volume)
Page 8.03
Event: 100 yr
SIN: 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
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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V'VET DETENTION POND DESIGN
WET DETENTION POND #2
POND VOLUMES
PERMANENT WATER QUALITY SURFACE AREA
TEMPORARY WATER QUALITY STORAGE PROVIDED

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