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WITHERS t~ " RAVEN EL
STORMWATER MANAGEMENT PLAN
WESTON TOWNHOMES
Morrisville, North Carolina
Prepared For;
EVERGREEN PARTNERS, LLC
4441 E. Six Forks Road
Suite 106-141
Raleigh, NC 27606
Attn David Cu(ly
Prepared By:
WITHERS & RAVENEL, INC
111 MacKenan Drive
Cary, North Carolina 27511
May 2007
W&R Project No. 02050561.10
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INTRODUCTION
WESTON TOWNHOMES
STORMWATER MANAGEMENT PLAN
MORRISVILLE, NORTH CAROLINA
The purpose of this study is to document pre- and post-development peak stormwater discharges
for the 1-year and to-year design storm events. The goal is to provide detention structures adequate
• to maintain a discharge less than or equal to the pre-development peak discharges for the 1-year
and io-year storms after the site has been developed in order to meet Neuse River Rules and local
town ordinances.
The site has a small stream running north to south through the middle of the property which will
serve as the discharge point for the one stormwater device on the property. The majority of the site
naturally drains towards the existing stream. A small portion of the site flows into the roadside
drainage along NC-54. The proposed stormwater detention pond will be in the center of the site, on
the north side ofthe primary subdivision road on the west side ofthe creek. (twill capture the runoff
from approximately 60% of the total site area, and 100% of the runoff from the impervious areas on
. the site.
The outlet from the detention pond will be routed through an existing stormwater pipe network
• located on an adjacent property. The stormwater management plan has been designed to meet
Neuse River Rules for diffuse flow through the buffer and i-year pre/post peak flows, as well as the
Town of Morrisville requirement for io-year pre/post peak flow rates.
METHODOLOGY
The stormwater study was conducted using the natural drainage features as depicted by the Wake
• County LIDAR topographic information (1-ft contours), field survey data and proposed development
within the drainage areas. The pre-development drainage area includes the entire site. For the
proposed conditions, the site was divided into two drainage areas with one of the drainage areas
• representing the runoff to the attenuation device and the second encompassing the remaining area
of the site.
The scope ofwork included the following analyses:
Hydrolo~y
• ^ Simulation of the i-year, 2-year, to-year andloo-year rainfall events for the Morrisville
area
^ Formulation of the i-year, 2-year, 1o-year and ioo-year flood hydrographs for the pre-
• and post-development drainage areas
• Hydraulic
^ Routing the 1-year, z-year, to-year and loo-year flood hydrographs for post development
runoff through the proposed stormwater attenuation device
•
•
The results of the hydrology calculations are used in the hydraulic analyses. The hydraulic design
requires the development of aotage-storage and stage-discharge function forthe proposed dry
detention device. The rainfall/runoff hydrographs, stage-storage and stage-discharge functions
have been compiled to create a routing computer simulation model using Haestad Methods
PondPack vio.o software. This PondPack model was then used to assess the impact of the peak
discharges for the design rainfall events. The PondPack modeling results are provided as
appendices to this report.
Weston Townhomes
stormwater Management Report
W&R Project zo556i.io
April zoo?
WESTON TOWNHOMES
STORMWATER MANAGEMENT PLAN
MORRISVILLE, NORTH CAROLINA
HYDROLOGY
The SCS Method was used for this model. Runoff hydrographs for the 24-hour duration rainfall
curves were determined using the NOAA Atlas i4 rainfall data for Raleigh-Durham International
Airport for the 2-year, so-year and loo-year storm events. The z-year hydrograph was computed
using a Type II rainfall distribution curve. The SCS method requires three basic parameters: a curve
number (CN), time of concentration (t~, and drainage area.
Curve numbers were based on soil type and land use. Soil types were delineated from the Soil
Survey of Wake County, North Carolina (November 1970). Land use for existing conditions was based
on the most recent Wake County aerial photographs. Post development land use is based on the
proposed site plan. The curve numbers used in this study are listed in the appendix of this report.
Times of concentration were calculated using methods described in the SCS publication "Urban
Hydrology for Small Watersheds, TR-55" and based on Wake County topographic maps and field
survey data. The post-development time of concentration was calculated for the drainage areas that
are piped to the storage device based on the flow time through the piped drainage systems and
small areas of sheet flow. The breakdown of the time of concentrations and the calcuiateci values
are found in the appendices of this report.
Weston Townhomes z W&R Project zo556i.io
StormwaterManagement Report April zoo?
WESTON TOWNHOMES
STORMWATER MANAGEMENT PLAN
MORRISVILLE, NORTH CAROLINA
TABLE i. DRAINAGE AREA SUMMARY
Pre-Development
Pre Development -Entire Site
Description Acres CN
Woods - C soils 2.83 70
Woods - D soils 3.35 77
Total 6.18 74
Post Development
Drainage Area #i -Post -Untreated
Description Acres CN
Woods 1.97 70
Open Space o.56 74
Total Z•53 71
Drainage Area #2 -Post - To Stormwater Pond
Description Acres CN
Impervious 1.81 g8
Open Space 1.84 74
Total 3.65 86
HYDRAULICS
Computer simulated reservoir routing of the 1-year, 2-year, 1o-year and loo-year design storms
utilized stage-storage and stage-discharge functions. Stage-storage functions were derived from the
proposed grading of the dry pond. Anon-linear regression relation for surface area versus elevation
was derived for the device. This relation estimates the incremental volume of the basin to the stage
or elevation ofthe basin. Stage-discharge functions were developed to size the outlet structure for
the structure for both peak attenuation requirements and water quality restrictions.
Weston Townhomes 3 W&R Project zo556i.io
Stormwater Management Report April Zoo?
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Name: CARY Location: 035° 49' 02.12" N 078° 49' 10.94" W
Date: 5/25/2007 Caption: Weston Townhomes
Scale: 1 inch equals 1000 feet Site Outlined in Red
Copyright (C) 1998, Maplech, Inc
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' "°"~"` ~' """ `°"~ ° ~ ~° "` '~ WESTON TOWNHOMES PHASE 1 ~~
' "°"~""`~"1DP~'"`°'"""" ° ° °"° °' POST DEVELOPMENT CONDITIONS PLAN WITHERS RAVENEL
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WESTON TOWNHOMES
STORMWATER MANAGEMENT PLAN
MORRISVILLE, NORTH CAROLINA
CONCLUSIONS
Based on the routing study, the post development peak discharge from the entire site is less than
the pre-development peak for the 1-year and io-year design storms. Table 2 below summarizes the
peak attenuation results. The outlet of the pond also ensures sheet flow through the buffer for the
first i" of rainfall.
TABLE 2. PEAKATTENUATION SUMMARY FOR THE 2-YEAR AND 10-YEAR DESIGN STORMS
1-year QPeak 10-year Qpeak
Pre-Development 8.25 cfs 23.19 cfs
Post-Development
Post- Untreated 2.75 cfs 8.45 cfs
Post -From Pond 4.56 cfs 13.62 cfs
Post-Development Total 7.06 cfs* 20.38 cfs*
" Nost Development Peaks are ottset
PROPOSED OUTLET SUMMARY
• io" orifice @ 365.00
• 4' x 4' inlet box, weir crest @ 369.75
• i8" Diameter Outlet Barrel
Weston Townhomes q W&R Project zo556i.io
Stormwater Management Report April zoo?
PEAK DISCHARGE
& ROUTING
CALCULATIONS
Job File: K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\WESTON TH REV 4 07.PPW
Rain Dir: K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\
JOB TITLE
--------------------------
--------------------------
Project Date: 1/23/2006
Project Engineer:
Project Title: 54 Park Morrisville
Project Comments:
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Table of Contents
i
********************** MASTER SUMMARY **********************
Watershed....... Master Network Summary ............. 1.01
****************** DESIGN STORMS SUMMARY *******************
RDU NOAA 14 Desi Design Storms ...................... 2.01
***************+****** TC CALCULATIONS *********************
POST TO POND.... TC CalCS ........................... 3.01
POST UNTREATED.. Tc Calcs ........................... 3.03
PRE DEVELOPMENT Tc Calcs ........................... 3.05
*************+******** CN CALCULATIONS *********************
POST TO POND.... Runoff CN-Area ..................... 4.01
POST UNTREATED.. Runoff CN-Area ..................... 4.02
PRE DEVELOPMENT Runoff CN-Area ..................... 4.03
*********************** POND VOLUMES ***********************
BMP ............. Vol: Elev-Area ..................... 5.01
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
2:04 PM
Withers & Ravenel
4/23/2007
Table of Contents
ii
******************** OUTLET STRUCTURES *********************
Outlet 1........ Outlet Input Data .................. 6.01
Composite Rating Curve ............. 6.04
*********************** POND ROUTING ***********************
BMP OUT 1
Pond Routing Summary ............... 7.01
BMP OUT 2
Pond Routing Summary ............... 7.02
BMP OUT 10
Pond Routing Summary ............... 7.03
BMP OUT 100
Pond Routing Summary ............... 7.04
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Master Network Summary Page 1.01
Name.... Watershed
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
MASTER DESIGN STORM SUMMARY
Network Storm Collection: RDU NOAA 14 Desi
Total
Depth
Return Event
------ in
------
2 ------
3.4400
10 4.9800
100 7.3700
1 3.0000
Rainfall
Type
----------------
Time-Depth Curve
Time-Depth Curve
Time-Depth Curve
Synthetic Curve
RNF ID
RDU NOAA 2yr
RDU NOAA 10yr
RDU NOAA 100yr
TypeII 24hr
MASTER ^:ET;":ORK SUMMP.F,Y
SCS Unit Hydrograph Method
(*Node=Outfall; +Node=Diversion;)
(Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left&Rt)
Return HYG Vol
Node ID Type Event ac-ft Trun
BMP IN POND 2 .622
BMP IN POND 10 1.049
BMP IN POND 100 1.741
BMP IN POND 1 .506
BMP OUT POND 2 .622
BMP OUT POND 10 1.049
BMP OUT POND 100 1.740
BMP OUT POND 1 .505
*OUT POST JCT 2 .838
*OUT POST JCT 10 1.492
*OUT POST JCT 100 2.591
*OUT POST JCT 1 .666
Max
Qpeak Qpeak Max WSEL Pond Storage
hrs cfs ft ac-ft
12.1000 13.41
12.1000 19.61
12.1000 26.09
11.9000 9.14
12.2500 5.04 369.16 .144
12.1500 13.62 370.05 .194
12.1500 21.73 370.53 .224
12.0500 4.56 368.48 .109
12.1000 8.69
12.1500 20.38
12.1000 34.93
12.0000 7.06
S/N. DOYXYWH3NLBE
PondPack (10.00.015.00)
2:04 PM
Withers & Ravenel
4/23/2007
•
•
•
•
•
•
•
•
•
•
•
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Type.... Master Network Summary Page 1.02
Name.... Watershed
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
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
Node ID Type Event ac-ft Trun
*OUT PRE JCT 2 .617
*OUT PRE JCT 10 1.209
*OUT PRE JCT 100 2.249
*OUT PRE JCT 1 .468
POST TO POND AREA 2 .622
PAST TQ PQNT) ARF_.A 10 l_Q4Q
POST TO POND AREA 100 1.741
POST TO POND AREA 1 .506
POST UNTREATED AREA 2 .216
POST UNTREATED AREA 10 .443
POST UNTREATED AREA 100 .851
POST UNTREATED AREA 1 .160
PRE DEVELOPMENT AREA 2 .617
PRE DEVELOPMENT AREA 10 1.209
PRE DEVELOPMENT AREA 100 2.249
PRE DEVELOPMENT AREA 1 .468
Max
Qpeak Qpeak Max WSEL Pond Storage
hrs cfs ft ac-ft
12.1000 13.06
12.1000 23.19
12.1000 35.27
11.9500 8.25
12.1000 13.91
12.lnnn 14,61
12.1000 26.09
11.9000 9.14
12.1000 4.46
12.1000 8.45
12.1000 13.40
11.9500 2.75
12.1000 13.06
12.1000 23.19
12.1000 35.27
11.9500 8.25
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
2:04 PM
Withers & Ravenel
4/23/2007
Type.... Design Storms
Name.... RDU NOAA 14 Desi
Page 2.01
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
Title... Project Date: 1/23/2006
Project Engineer:
Project Title: 54 Park Morrisville
Project Comments:
DESIGN STORMS SUMMARY
Design Storm File,ID = RDU NOAA 14 Desi
Storm Tag Name = 2
Data Type, File, ID = Time-Depth Curve RDU NOAA 2yr
Storm Frequency = 2 yr
Total Rainfall Depth= 3.4400 in
Duration Multiplier = 1
Resulting Duration = 23.9904 hrs
Resulting Start Time= .0000 hrs Step= .0833 hrs End= 23.9904 hrs
Storm Tag Name = 10
Data Type, File, ID
Storm Frequency
Total Rainfall Depth
Duration Multiplier
Resulting Duration
Resulting Start Time
Time-Depth Curve RDU NOAA l0yr
10 yr
4.9800 in
1
23.9904 hrs
.0000 hrs Step= .0833 hrs End= 23.9904 hrs
Storm Tag Name = 100
Data Type, File, ID = Time-Depth Curve RDU NOAA 100yr
Storm Frequency = 100 yr
Total Rainfall Depth= 7.3700 in
Duration Multiplier = 1
Resulting Duration = 23.9990 hrs
Resulting Start Time= .0000 hrs Step= .0833 hrs End= 23.9990 hrs
Storm Tag Name = 1
Data Type, File, ID =
Storm Frequency =
Total Rainfall Depth=
Duration Multiplier =
Resulting Duration =
Resulting Start Time=
Synthetic Storm TypeII 24hr
1 yr
3.0000 in
1
24.0000 hrs
.0000 hrs Step= .1000 hrs End= 24.0000 hrs
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Tc Calcs
Name.... POST TO POND
Page 3.01
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
........................................................................
........................................................................
TIME OF CONCENTRATION CALCULATOR
........................................................................
........................................................................
Segment #l: Tc: User Defined
Segment #1 Time: .0830 hrs
------------------------------------------------------------------------
Total Tc: .0830 hrs
Calculated Tc < Min.Tc:
LTSe Minimum TC, , .
Use Tc = .0833 hrs
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
2:09 PM
Withers & Ravenel
4/23/2007
Type.... Tc Calcs
Name.... POST TO POND
Page 3.02
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
------------------------------------------------------------------------
Tc Equations used...
------------------------------------------------------------------------
___= User Defined =____------ ___________________________________
Tc = Value entered by user
Where: Tc = Time of concentration
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Tc Calcs
Name.... POST UNTREATED
Page 3.03
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
........................................................................
........................................................................
TIME OF CONCENTRATION CALCULATOR
........................................................................
........................................................................
Segment #1: Tc: User Defined
Segment #1 Time: .0830 hrs
Total Tc: .0830 hrs
Calculated Tc < Min.Tc:
Use Minimum Tc...
Use Tc = .0833 hrs
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Tc Calcs
Name.... POST UNTREATED
Page 3.04
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
------------------------------------------------------------------------
Tc Equations used...
------------------------------------------------------------------------
___= User Defined =-----------------------------------------------------
Tc = Value entered by user
Where: Tc = Time of concentration
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Tc Calcs
Name.... PRE DEVELOPMENT
Page 3.05
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
........................................................................
........................................................................
TIME OF CONCENTRATION CALCULATOR
........................................................................
........................................................................
Segment #1: Tc: User Defined
Segment #1 Time: .0830 hrs
-------------------------
Total Tc: .0830 hrs
Calculated Tc < Min.Tc:
Use Minimum Tr_,_
Use Tc = .0833 hrs
S/N: DOYXYWH3NLSE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Tc Calcs
Name.... PRE DEVELOPMENT
Page 3.06
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
------------------------------------------------------------------------
Tc Equations used...
------------------------------------------------------------------------
___= User Defined ______________________________________________________
Tc = Value entered by user
Where: Tc = Time of concentration
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Runoff CN-Area
Name.... POST TO POND
Page 4.01
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
RUNOFF CURVE NUMBER DATA
..........................................................................
..........................................................................
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres oC %UC CN
Townhomes 98 1.000 98.00
Sidewalk 98 .220 98.00
Pavement 98 .590 98.00
Open space C Soils - Good condition 74 1.840 74.00
COMPOSITE AREA & WEIGHTED
.......................... CN --->
.............. 3.650
..........
............ 85.90 (86)
.............
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Runoff CN-Area
Name.... POST UNTREATED
Page 4.02
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
RUNOFF CURVE NUMBER DATA
..........................................................................
..........................................................................
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres oC aUC CN
-------------------------------- ---- --------- ----- ----- ------
Open space C Soils - Good condition 74 .560 74.00
Woods - good 70 1.970 70.00
COMPOSITE AREA & WEIGHTED CN ---> 2.530 70.89 (71)
...........................................................................
...........................................................................
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Runoff CN-Area
Name.... PRE DEVELOPMENT
Page 4.03
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
RUNOFF CURVE NUMBER DATA
..........................................................................
..........................................................................
Impervious
Area Adjustment Adjusted
Soil/Surface Description CN acres oC oUC CN
Woods - good 70 2.830 70.00
Woods - good 77 3.350 77.00
COMPOSITE AREA & WEIGHTED CN --->
........................................
........................................ 6.180
..........
..........
............
............ 73.79 (74)
.............
.............
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Vol: Elev-Area
Name.... BMP
Page 5.01
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
Elevation Planimeter Area Al+A2+sgr(Al*A2) Volume Volume Sum
(ft)
------------ (sq.in) (sq.ft)
--------------------- (sq.ft)
----------------- (ac-ft)
-
--
- (ac-ft)
365.00
----- 824
0 -
-
-
--
.000 -------------
.000
366.00 ----- 1109 2889 .022 .022
367.00 ----- 1426 3793 .029 .051
368.00 ----- 1773 4789 .037 .088
369.00 ----- 2350 6164 .047 .135
370.00 ----- 2558 7360 .056 .191
371.00 ----- 2996 8322 .064 .255
POND VOLUME EQUATIONS
* Incremental volume computed by the Conic Method for Reservoir Volumes.
`.'Clw..~ _ (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: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Outlet Input Data
Name.... Outlet 1
Page 6.01
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
REQUESTED POND WS ELEVATIONS:
Min. Elev.= 365.00 ft
Increment = .05 ft
Max. Elev.= 371.00 ft
OUTLET CONNECTIVITY
---> Forward Flow Only (Upstream to DnStream)
<--- Reverse Flow Only (DnStream to Upstream)
<---> Forward and Reverse Both Allowed
Structure No. Outfall E1, ft E2, ft
Orifice-Circular O1 ---> TW 365.000 371.000
Inlet Box RO ---> CO 369.750 371.000
Culvert-Circular CO ---> TW 365.000 371.000
TW SETUP, DS Channel
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Outlet Input Data
Name.... Outlet 1
Page 6.02
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
OUTLET STRUCTURE INPUT DATA
Structure ID = O1
Structure Type = Orifice-Circular
------------------------------------
# of Openings = 1
Invert Elev. = 365.00 ft
Diameter = .8300 ft
Orifice Coeff. _ .600
Structure ID = RO
Structure Type = Inlet Box
# of Openings = 1
Invert Elev. = 369.75 ft
Orifice Area = 16.0000 sq.ft
Orifice Coeff. _ .600
Weir Length = 16.00 ft
Weir Coeff. = 3.100
K, Reverse = 1.000
Mannings n = .0000
Kev,Charged Riser = .000
Weir Submergence = No
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Outlet Input Data
Name.... Outlet 1
Page 6.03
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
OUTLET STRUCTURE INPUT DATA
Structure ID = CO
Structure Type = Culvert-Circular
------------------
No. Barrels -----------
= 1 -------
Barrel Diameter = 1.5000 ft
Upstream Invert = 365.00 ft
Dnstream Invert = 364.00 ft
Horiz. Length = 140.00 ft
Barrel Length = 140.00 ft
Barrel Slope = .00714 ft/ft
OUTLET CONTROL DATA...
Mannings n = .0130
Ke = ,5000
Kb = .018213
Kr = .5000
HW Convergence = .001
ffprward antran~e ing~l
(per ft of full flow)
(reverse entrance loss)
+/- ft
INLET CONTROL DATA...
Equation form = 1
Inlet Control K = .0018
Inlet Control M = 2.0000
Inlet Control c = .02920
Inlet Control Y = .7400
Tl ratio (HW/D) _ .000
T2 ratio (HW/D) = 1.204
Slope Factor = -.500
Use unsubmerged inlet control Form 1 equ. below T1 elev.
Use submerged inlet control Form 1 equ. above T2 elev.
In transition zone between unsubmerged and submerged inlet control,
interpolate between flows at Tl & T2...
At Tl Elev = 365.00 ft ---> Flow = 7.58 cfs
At T2 Elev = 366.81 ft ---> Flow = 8.66 cfs
Structure ID = TW
Structure Type = TW SETUP, DS Channel
FREE OUTFACE CONDITIONS SPECIFIED
CONVERGENCE TOLERANCES ...
Maximum Iterations= 40
Min. TW tolerance = .01 ft
Max. TW tolerance = .01 ft
.Min. HW tolerance = .01 ft
Max. HW tolerance = .01 ft
Min. Q tolerance = .00 cfs
Max. Q tolerance = .00 cfs
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Composite Rating Curve
Name.... Outlet 1
Page 6.04
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
***** COMPOSITE OUTFLOW SUMMARY ****
WS Elev, Total Q
----------------
Elev. Q
ft cfs
365.00
365.05
365.10
365.15
365.20
365.25
365.30
365.35
365.40
365,45
365.50
365.55
365.60
365.65
365.70
365.75
365.80
365.85
365.90
365.95
366.00
366.05
366.10
366.15
366.20
366.25
366.30
366.35
366.40
366.45
366.50
366.55
366.60
366.65
366.70
366.75
366.80
366.85
.00
.01
.03
.07
.12
.18
.26
.35
.45
.56
.67
.80
.94
1.07
1.22
1.37
1.53
1.72
1.81
1.90
1.99
2.08
2.16
2.23
2.31
2.38
2.45
2.52
2.58
2.65
2.71
2.77
2.83
2.89
2.95
3.01
3.06
3.12
Notes
-------- Converge -------------------------
TW Rlo« Frrnr
ft +/-ft
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Qiitfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
Free Outfall
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
Contributing Structures
(no Q: O1,RO,CO)
O1 (no Q: RO,CO)
Ol (no Q: RO,CO)
Ol (no Q: RO,CO)
O1 (no Q: RO,CO)
01 (no Q: RO,CO)
O1 (no Q: RO,CO)
Ol (no Q: RO,CO)
O1 (no Q: RO,CO)
01 (np Q; R. (l; C'(11
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
01 (no Q: RO,CO)
O1 (no Q: RO,CO)
01 (no Q: RO,CO)
Ol (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
01 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
01 (no Q: RO,CO)
01 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
Ol (no Q: RO,CO)
Ol (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
Ol (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
O1 (no Q: RO,CO)
Withers & Ravenel
2:04 PM
4/23/2007
Type.... Composite Rating Curve
Name.... Outlet 1
Page 6.05
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
***** COMPOSITE OUTFLOW SUMMARY ****
WS Elev, Total Q Notes
-------- -------- ----- --- Converge --- ---- --- ---------------
Elev. Q TW Elev Error
ft
-
-- cfs f t +/-ft Con trib uting Structures
-
----
366.90 -------
3.17 -----
Free --- -----
Outfall ----
Ol ----
(no ---
Q: ---------------_
RO,CO)
366.95 3.23 Free Outfall O1 (no Q: RO,CO)
367.00 3.28 Free Outfall 01 (no Q: RO,CO)
367.05 3.33 Free Outfall Ol (no Q: RO,CO)
367.10 3.38 Free Outfall O1 (no Q: RO,CO)
367.15 3.43 Free Outfall 01 (no Q: RO,CO)
367.20 3.48 Free Outfall O1 (no Q: RO,CO)
367.25 3.53 Free Outfall 01 (no Q: RO,CO)
367.30 3.58 Free Outfall O1 (no Q: RO,CO)
367,35 3:62 F'T"PP Outfall nl Inn (1• R_n,rn)
367.40 3.67 Free Outfall 01 (no Q: RO,CO)
367.45 3.71 Free Outfall 01 (no Q: RO,CO)
367.50 3.76 Free Outfall O1 (no Q: RO,CO)
367.55 3.81 Free Outfall 01 (no Q: RO,CO)
367.60 3.85 Free Outfall Ol (no Q: RO,CO)
367.65 3.89 Free Outfall Ol (no Q: RO,CO)
367.70 3.94 Free Outfall Ol (no Q: RO,CO)
367.75 3.98 Free Outfall O1 (no Q: RO,CO)
367.80 4.02 Free Outfall Ol (no Q: RO,CO)
367.85 4.06 Free Outfall O1 (no Q: RO,CO)
367.90 4.11 Free Outfall 01 (no Q: RO,CO)
367.95 4.15 Free Outfall O1 (no Q: RO,CO)
368.00 4.19 Free Outfall 01 (no Q: RO,CO)
368.05 4.23 Free Outfall O1 (no Q: RO,CO)
368.10 4.27 Free Outfall O1 (no Q: RO,CO)
368.15 4.31 Free Outfall O1 (no Q: RO,CO)
368.20 4.35 Free Outfall 01 (no Q: RO,CO)
368.25 4.38 Free Outfall Ol (no Q: RO,CO)
368.30 4.42 Free Outfall 01 (no Q: RO,CO)
368.35 4.46 Free Outfall O1 (no Q: RO,CO)
368.40 4.50 Free Outfall O1 (no Q: RO,CO)
368.45 4.54 Free Outfall O1 (no Q: RO,CO)
368.50 4.57 Free Outfall O1 (no Q: RO,CO)
368.55 4.61 Free Outfall Ol (no Q: RO,CO)
368.60 9.65 Free Outfall O1 (no Q: RO,CO)
368.65 4.68 Free Outfall O1 (no Q: RO,CO)
368.70 4.72 Free Outfall 01 (no Q: RO,CO)
368.75 4.76 Free Outfall O1 (no Q: RO,CO)
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
2:04 PM
Withers & Ravenel
4/23/2007
Type.... Composite Rating Curve
Name.... Outlet 1
Page 6.06
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
***** COMPOSITE OUTFLOW SUMMARY ****
WS Elev, Total Q Notes
-------- -------- ----- --- Converge
--------
--
---------------
Elev. Q TW E lev Error
ft
-------- cfs
------- f
--- t +/-ft Contributing Structures
368.80
4.79 --
Free --- -----
Outfall ---------
O1 (no --
Q: ---------------
RO,CO)
368.85 4.83 Free Outfall O1 (no Q: RO,CO)
368.90 4.86 Free Outfall 01 (no Q: RO,CO)
368.95 4.90 Free Outfall O1 (no Q: RO,CO)
369.00 4.93 Free Outfall O1 (no Q: RO,CO)
369.05 4.96 Free Outfall 01 (no Q: RO,CO)
369.10 5.00 Free Outfall O1 (no Q: RO,CO)
369.15 5.03 Free Outfall O1 (no Q: RO,CO)
369.20 5.07 Free Outfall Ol (no Q: RO,CO)
369.25 5,10 Free Outfall n1 (no Q. Rn ten)
~,
369.30 5.13 Free Outfall Ol (no Q: RO,CO)
369.35 5.17 Free Outfall O1 (no Q: RO,CO)
369.40 5.20 Free Outfall O1 (no Q: RO,CO)
369.45 5.23 Free Outfall O1 (no Q: RO,CO)
369.50 5.26 Free Outfall O1 (no Q: RO,CO)
369.55 5.30 Free Outfall Ol (no Q: RO,CO)
369.60 5.33 Free Outfall O1 (no Q: RO,CO)
369.65 5.36 Free Outfall Ol (no Q: RO,CO)
369.70 5.39 Free Outfall Ol (no Q: RO,CO)
369.75 5.42 Free Outfall O1 (no Q: RO,CO)
369.80 6.01 Free Outfall O1,RO,C0
369.85 7.05 Free Outfall O1,RO,C0
369.90 8.40 Free Outfall O1,RO,C0
369.95 9.98 Free Outfall O1,RO,C0
370.00 11.78 Free Outfall O1,RO,C0
370.05 13.75 Free Outfall O1,RO,C0
370.10 15.91 Free Outfall O1,RO,C0
370.15 18.22 Free Outfall O1,RO,C0
370.20 20.67 Free Outfall O1,RO,C0
370.25 21.13 Free Outfall O1,RO,C0
370.30 21.24 Free Outfall O1,RO,C0
370.35 21.35 Free Outfall O1,RO,C0
370.40 21.46 Free Outfall O1,RO,C0
370.45 21.57 Free Outfall O1,RO,C0
370.50 21.67 Free Outfall O1,RO,C0
370.55 21.76 Free Outfall O1,RO,C0
370.60 21.87 Free Outfall O1,RO,C0
370.65 21.98 Free Outfall Ol,R0,C0
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:09 PM 4/23/2007
Type.... Composite Rating Curve
Name.... Outlet 1
Page 6.07
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
***** COMPOSITE OUTFLOW SUMMARY ****
WS Elev, Total Q Notes
-------- -------- ------ -- Converge -------------------------
Elev. Q TW El ev Error
ft cfs ft +/-ft Contributing Structures
370.70 22.08 Free Outfall O1,RO,C0
370.75 22.19 Free Outfall Ol,R0,C0
370.80 22.29 Free Outfall O1,RO,C0
370.85 22.39 Free Outfall O1,RO,C0
370.90 22.50 Free Outfall Ol,R0,C0
370.95 22.60 Free Outfall Ol,R0,C0
371.00 22.70 Free Outfall O1,RO,C0
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Pond Routing Summary Page 7.01
Name.... BMP OUT Tag: 1 Event: 1 yr
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
Storm... TypeII 24hr Tag: 1
LEVEL POOL ROUTING SUMMARY
HYG Dir = K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\
Inflow HYG file = work_pad.hyg - BMP IN 1
Outflow HYG file = work pad.hyg - BMP OUT 1
Pond Node Data = BMP
Pond Volume Data = BMP
Pond Outlet Data = Outlet 1
No Infiltration
INITIAL CONDITIONS
Starting WS Elev = 365.00 ft
Starting Volume = .000 ac-ft
Starting Outflo4r = .00 cfs
Starting I.^.filtr. _ . nn cfs
Starting Total Qout= .00 cfs
Time Increment = .0500 hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow = 9.14 cfs at 11.9000 hrs
Peak
----- Outflow =
------------- 4.56 cfs at 12.0500 hrs
Peak -
Elevation = -----------
368.48 -----------------------
ft
Peak Storage = .109 ac-ft
MASS BALANCE (ac-ft)
--------------------------
+ Initial Vol = .000
+ HYG Vol IN = .506
- Infiltration = .000
- HYG Vol OUT = .505
- Retained Vol = .000
Unrouted Vol = -.000 ac-ft (.0000 of Inflow Volume)
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Pond Routing Summary Page 7.02
Name.... BMP OUT Tag: 2 Event: 2 yr
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
Storm... RDU NOAA 2yr Tag: 2
LEVEL POOL ROUTING SUMMARY
HYG Dir = K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\
Inflow HYG file = work_pad.hyg - BMP IN 2
Outflow HYG file = work pad.hyg - BMP OUT 2
Pond Node Data = BMP
Pond Volume Data = BMP
Pond Outlet Data = Outlet 1
No Infiltration
INITIAL CONDITIONS
Starting WS Elev = 365.00 ft
Starting Volume = .000 ac-ft
Starting Outfloca = .00 cfs
Starting Infiltr. _ ,00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0500 hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow = 13.41 cfs at 12.1000 hrs
Peak Outflow = 5.04 cfs at 12.2500 hrs
Peak Elevation = 369.16 ft
Peak Storage = .144 ac-ft
MASS BALANCE (ac-ft)
+ Initial Vol = .000
+ HYG Vol IN = .622
- Infiltration = .000
- HYG Vol OUT = .622
- Retained Vol = .000
Unrouted Vol = -.000 ac-ft
(.000% of Inflow Volume)
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Pond Routing Summary Page 7.03
Name.... BMP OUT Tag: 10 Event: 10 yr
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
Storm... RDU NOAA l0yr Tag: 10
LEVEL POOL ROUTING SUMMARY
HYG Dir = K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\
Inflow HYG file = work pad.hyg - BMP IN 10
Outflow HYG file = work pad.hyg - BMP OUT 10
Pond Node Data = BMP
Pond Volume Data = BMP
Pond Outlet Data = Outlet 1
No Infiltration
INITIAL CONDITIONS
Starting WS Elev = 365.00 ft
Starting Volume = .000 ac-ft
Starting Outflow = .00 cfs
Starting Inflltr. _ .00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0500 hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow = 19.61 cfs at 12.1000 hrs
Peak Outflow = 13.62 cfs at 12.1500 hrs
Peak Elevation = 370.05 ft
Peak Storage = .194 ac-ft
MASS BALANCE (ac-ft)
+ Initial Vol = .000
+ HYG Vol IN = 1.049
- Infiltration = .000
- HYG Vol OUT = 1.049
- Retained Vol = .000
Unrouted Vol = -.000 ac-ft (.0000 of Inflow Volume)
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Type.... Pond Routing Summary Page 7.04
Name.... BMP OUT Tag: 100 Event: 100 yr
File.... K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\Weston TH Rev 4 07.ppw
LEVEL POOL ROUTING SUMMARY
HYG Dir = K:\05\05-560\05561.10-Phase 1 Weston Townhomes\H-H\
Inflow HYG file = work_pad.hyg - BMP IN 100
Outflow HYG file = work pad.hyg - BMP OUT 100
Pond Node Data = BMP
Pond Volume_Data = BMP
Pond Outlet Data = Outlet 1
No Infiltration
INITIAL CONDITIONS
Starting WS Elev = 365.00 ft
Starting Volume = .000 ac-ft
Starting Outflow = .00 cfs
Starting Infiltr, _ .00 cfs
Starting Total Qout= .00 cfs
Time Increment = .0500 hrs
INFLOW/OUTFLOW HYDROGRAPH SUMMARY
Peak Inflow = 26.09 cfs at 12.1000 hrs
Peak Outflow = 21.73 cfs at 12.1500 hrs
Peak Elevation = 370.53 ft
Peak Storage = .224 ac-ft
MASS BALANCE (ac-ft)
+ Initial Vol = .000
+ HYG Vol IN = 1.741
- Infiltration = .000
- HYG Vol OUT = 1.740
- Retained Vol = .000
Unrouted Vol = -.000 ac-ft (.0000 of Inflow Volume)
S/N: DOYXYWH3NLBE Withers & Ravenel
PondPack (10.00.015.00) 2:04 PM 4/23/2007
Appendix A
Index of Starting Page Numbers for ID Names
----- B -----
BMP... 5.01, 7.01, 7.02, 7.03, 7.04
----- O -----
Outlet 1... 6.01, 6.04
----- P -----
POST TO POND... 3.01, 4.01
POST UNTREATED... 3.03, 4.02
PRE DEVELOPMENT... 3.05, 4.03
----- R -----
RDU NOAA 14 Desi... 2.01
----- W -----
Watershed... 1.01
A-1
S/N: DOYXYWH3NLBE
PondPack (10.00.015.00)
2:04 PM
Withers & Ravenel
4/23/2007
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Title: Weston Townhomes Pond Outlet Project Engineer: WR
k:1...\h-h\weston outlet-dw.stm Withers 8 Ravenel StortnCAD v5.6 [05.08.005.OOJ
01/24/08 01:D7:15 PM ®Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1
37.17 h 24 inch Concrete
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Title: Weston Townhomes Pond Outlet
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01/24/08 01:08:18 PM
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~ Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA *1-203-755-1666
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Page 1 of 1
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37.17 ft 24 inch Caiaete
@S=1.67 °h
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