20081404 Ver 1_More Info Received_20081105

ENVIRONMENTAL SERVICES, INC.
524 S. NEW HOPE ROAD
RALEIGH, NORTH CAROLINA 27610
919-212-1760 • FAX [phone]
www.environmentalservicesinc.com
November 5, 2008
Ms. Cyndi Karoly
NCDWQ - 401/Wetlands Unit
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
Re: Lakewood Subdivision
DWQ Project # 2008-1404
Ms. Karoly:
"V
ESI is submitting this additional information for the above referenced project on behalf of
the applicant. The information provided below is in response to your letter dated 8
October 2008. Our responses are provided in the order they were listed in your letter.
Some of the accompanying documentation has been provided by the project engineer and
is attached to this letter.
1. Planting Plan
ESI has revised the proposed buffer restoration plan to include specifics regarding the
species to be planted. Also provided is a sketch showing the approximate layout of the
proposed planting details. Trees and shrubs will be planted in clusters throughout the
new buffer. All applicable densities will be achieved using this cluster method. The
planting cluster proposed for Zone I will consist of a shrub surrounded by a cluster of
five trees. Zone 2 planting will consist of a shrub surrounded by a cluster of three trees.
Planting at an initial density of 440 stems/acre will require approximately 550 total
stems in the 1.25 acres to be planted.
2. Level Spreaders
The level spreader has been redesigned to be more parallel with the contour lines. The
calculations to support the stormwater management are also included with this package
along with the O&M agreement.
3. Picnic Area in the Buffer
The picnic area has been removed from the site plan and replaced with a small fishing
area that will remain in a relatively natural state. The proposed fishing area is
approximately 15 feet wide and 50 feet long.
FLORIDA 0 GEORGIA • NORTH CAROLINA 0 SOUTH CAROLINA • MARYLAND 0 OHIO
ENVIRONMENTAL SERVICES, INC.
4. Avoidance and Minimization
The applicant has shifted most of the proposed boardwalk outside of Zone I to
demonstrate additional avoidance and minimization measures. Total Zone I impacts
have been reduced from 22, 669ftz down to 10, 464ft {reduction of 12, 205ft2}. Zone 2
impacts have therefore increased and are 14,134ftz Total buffer impact has been
reduced by 2, 640ft' for a new total of 24,598f z. The elevation of the proposed boardwalk
will be a minimum of 3 feet above ground level in most locations.
5. Septic Fields
The project engineer has depicted the proposed septic f elds on the attached site plan.
We trust that this information will allow you to continue reviewing the permit
application. Please call me if you have any questions or comments.
Sincerely,
ENVIRONMENTAL SERVICES, INC.
eff Harbour, PWS
Asst. Vice President
Cc: Bruce Goodenough
Lauren Witherspoon
Lakewood Subdivision Buffer Planting Diagram
Tar River Reservoir
Zone 1 planting cluster
Black gum,
water oak,
persimmon, or
1 river birch e
Black gum, Black gum, t.
water oak, water oak,
persimmon, or I persimmon, or
river birch;„ river birch
Wax myrtle
10? i 10?
g

Black gum, Black gum,
water oak, water oak,
persimmo% or persimmon, or
river ALA.Aw river birch

Zone 2 planting cluster
' Black gum \
water oak,
persimmon, or
river birch
I p, $, 10
Black gum, Black gum,
water oak, /'Silky dogwood, ?. water oak,
persimmon, or red chokeberry, persi
river birch or V riv
g Wax myrtle V
Buffer Impacts for Lake Wood Subdivision
Zone 1 Impacts (ft2) Zone 2 Impacts (ft2)
Canal 7350 2740
Elevated Boardwalk 0 9840
Fishing Area 750 0
Trails from Lots 804 1554
Walkway to Boatdocks 1560 0
and Fishing Platform
Zone 1 Total Zone 2 Total
10464 14134
Total
10090
9,840
750
2,358
1,560
Combined Total
24598
08-I``w°
STORM LINE 1
DESIGN CALCULATION
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Ex. 15" CPP from Field Stream Dr
Worksheet for Circular Channel
Project Description
Project File j:\phillip\haestad\fmw\p070044.fm2
Worksheet Ex. 15" CPP from Field Stream Dr
Flow Element Circular Channel
Method Manning's Formula
Solve For Full Flow Capacity
Input Data
Mannings Coefficient 0.024
Channel Slope 0.015000 ft/ft
Diameter 15.00 in
Results
Depth 1.25 ft
Discharge 4.29 cfs
Flow Area 1.23 ft2
Wetted Perimeter 193 ft
Top Width 0.00 ft
Critical Depth 0.84 ft
Percent Full 100.00
Critical Slope 0.023992 ft/ft
Velocity 3.49 ft/s
Velocity Head 0.19 ft
Specific Energy FULL ft
Froude Number FULL
Maximum Discharge 4.61 cfs
Full Flow Capacity 4.29 cfs
Full Flow Slope 0.015000 ft/ft
FlovvMastef v5lb
Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 'I of 1
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FES-2, 18"FES
EROSION CONTROL
V= 2.8
ZONE= 1 Figure *.06.b.1
Stone Class = A Figure *.06.b.2
Class A B 1 II
Dmax 6 12 20 24
Depth 10 22 48 48
LENGTH OF APRON
zone class Inlet Outlet
1 A n/a 6
STORM LINE 2 DESIGN
CALCULATIONS
H yd ra f l ow Table of Contents P070044 Lakewood Subdivision Sign Pond.gpw
' Hydraflow Hydrographs by Intelisolve v9.02 Friday, Jun 6, 2008
' Watershed Model Schematic ................................................................................... 1
Hydrograph Return Period Recap .......................................................................... 2
2 - Year
' Summary Report ....... 3
...........................................................................................................
Hydrograph Reports . 4
Hydrograph No. 1, Rational, Da-1 Offsite Residential ........................................................ 4
Hydrograph No. 2, Rational, Da-2 Offsite Farm Land ........................................................ 5
Hydrograph No. 3, Rational, Da-3 Pond Area .................................................................... 6
Hydrograph No. 4, Combine, P4 ........................................................................................ 7
Hydrograph No. 5, Combine, POND .................................................................................. 8
Hydrograph No. 6, Reservoir, ROUTED RUNOFF ............................................................ 9
10 - Year
Summary Report ................................................................................................................ 10
Hydrograph Reports .......................................................................................................... 11
Hydrograph No. 1, Rational, Da-1 Offsite Residential ...................................................... 11
Hydrograph No. 2, Rational, Da-2 Offsite Farm Land ...................................................... 12
Hydrograph No. 3, Rational, Da-3 Pond Area .................................................................. 13
Hydrograph No. 4, Combine, P4 ...................................................................................... 14
Hydrograph No. 5, Combine, POND ................................................................................ 15
Hydrograph No. 6, Reservoir, ROUTED RUNOFF .......................................................... 16
25 - Year
Summary Report ................................................................................................................ 17
Hydrograph Reports .......................................................................................................... 18
Hydrograph No. 1, Rational, Da-1 Offsite Residential ...................................................... 18
Hydrograph No. 2, Rational, Da-2 Offsite Farm Land ...................................................... 19
Hydrograph No. 3, Rational, Da-3 Pond Area .................................................................. 20
Hydrograph No. 4, Combine, P4 ...................................................................................... 21
Hydrograph No. 5, Combine, POND ................................................................................ 22
Hydrograph No. 6, Reservoir, ROUTED RUNOFF .......................................................... 23
100 - Year
Summary Report ................................................................................................................ 24
Hydrograph Reports .......................................................................................................... 25
Hydrograph No. 1, Rational, Da-1 Offsite Residential ...................................................... 25
Hydrograph No. 2, Rational, Da-2 Offsite Farm Land .................... ............................. 26
Hydrograph No. 3, Rational, Da-3 Pond Area .................................................................. 27
Hydrograph No. 4, Combine, P4 ........................ ......................................................... 28
Hydrograph No. 5, Combine, POND ................................................................................ 29
Hydrograph No. 6, Reservoir, ROUTED RUNOFF .......................................................... 30
I Watershed Model Schematic
1
Hydraflow Hydrographs by Intelisolve v9.02
1 Oftstle Residential 2 -- Da-2 Offsile Fat in Land
l?
V 5-POND
E - ROUTED RUNOFF
Project: 13070044 Lakewood Subdivision Sign Pond gpw
3 - Da-3 Pond At ea
(?D
pnday, Jun G, 2008
2
Hydrograph Return Period Recap
Hydraflow Hydrographs by Intelisolve v9.02
Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph
tion
d
i
No. type Hyd(s) escr
p
(origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr
1 Rational --- --- 11.96 -- - - 16.18 18.23 20.98 Da-1 Offsite Residential
2 Rational ------- - - 14.65 ------- -- 19.96 22.61 ---- 26.21 Da-2 Oflsite Farm Land
3 Rational ------- ------- 4.869 ------ -- 6.200 6.816 --- - 7.567 Da-3 Pond Area
4 Combine 1, 2, - - 24.61 ---- -- 33.44 37.80 --- 43.69 P4
5 Combine 3,4 ---- 24.61 -- 33.44 37.80 ---- 43.69 POND
6 Reservoir 5 ------- 11.35 ------- - -- 14.80 15.18 ------ 16.74 ROUTED RUNOFF
I1iol . file. 1-'07004 4 Lakew ood Sub division Si0ii M idupw ? Frid ay, Jun 6, 2-0043
I Hydrograph Summary Report
Hydraflow Hydrographs by Intelisolve v9.02
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Hyd.
volume
(cult) Inflow
hyd(s) Maximum
elevation
(ft) Total
strge used
(cult) Hydrograph
description
1 Rational 11.96 1 36 25,831 - -- -- Da-1 Offsite Residential
2 Rational 14.65 1 42 36,910 - - ------ - - - Da-2 Offsite Farm Land
3 Rational 4.869 1 6 1,753 -- Da-3 Pond Area
4 Combine 24.61 1 42 62,741 1, 2, ------ ----- P4
5 Combine 24.61 1 42 65,181 3,4 - - - --- - POND
6
I
I Reservoir 11.35 1 61 65,106 5 132.77 40,712 ROUTED RUNOFF
H),' 0044 Lakewo od SUTA M61011 S ign P011( Tp w ri P eriod: 2 Ye ar Friday, Jun 6, 2008
t
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.02 Friday, Jun 6, 2008
Hyd. No. 1
Da-1 Offsite Residential
Hydrograph type = Rational Peak discharge = 11.96 cfs
Storm frequency = 2 yrs Time to peak = 36 min
Time interval = 1 min Hyd. volume = 25,831 cuft
Drainage area = 20.800 ac Runoff coeff. = 0.25
Intensity = 2.300 in/hr Tc by User = 36.00 min
OF Curve = Raleigh.IDF Asc/Rec limb fact = 111
Q (cfs)
12.00
10.00
8.00
6.00
4.00
2.00
0.00 '
0 10
- Hyd No. 1
Da-1 Offsite Residential
Hyd No. 1 -- 2 Year
20 30 40 50 60 70
Q (cfs)
12.00
10.00
8.00
6.00
4.00
2.00
-- 0.00
80
Time (min)
5
Hydrograph Report
Hydraflow Hydrographs by Intelisolve V9.02
Hyd. No. 2
Da-2 Offsite Farm Land
Friday, Jun 6, 2008
Hydrograph type = Rational
Storm frequency = 2 yrs
Time interval = 1 min
Drainage area = 23.500 ac
' Intensity = 2.078 in/hr
OF Curve = Raleigh.IDF
1 Q (cfs)
' 15.00
12.00
9.00
6.00 -
' 3.00 -
0 00 -
Da-2 Offsite Farm Land
Hyd. No. 2 -- 2 Year
0 10
- Hyd No. 2
Peak discharge = 14.65 cfs
Time to peak = 42 min
Hyd. volume = 36,910 cuft
Runoff coeff. = 0.3
Tc by User = 42.00 min
Asc/Rec limb fact = 1/1
20 30 40 50 60 70 80
Q (cfs)
15.00
12.00
9.00
6.00
3.00
-1 0.00
90
Time (min)
Da-3 Pond Area
Hyd. No. 3 -- 2 Year
Hydrograph type = Rational
Storm frequency = 2 yrs
'
Time interval = 1 min
Drainage area = 1.910 ac
intensity = 5.311 in/hr
IDF Curve = Raleigh.IDF
Q (cfs)
5.00
i
4.00
3.00
2.00
' 1.00
0 00
Friday, Jun 6, 2008
Peak discharge = 4.869 cfs
Time to peak = 6 min
Hyd. volume = 1,753 cuft
Runoff coeff. = 0.48
Tc by User = 6.00 min
Asc/Rec limb fact = 1/1
6
Q (cfs)
5.00
4.00
3.00
2.00
1.00
0 1 2
Hyd No. 3
Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.02
Hyd. No. 3
Da-3 Pond Area
3 4 5 6 7 8 9 10 11
'?- 0.00
12
Time (min)

Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.02 Friday, Jun 6, 2008
Hyd. No. 4
' P4
Hydrograph type = Combine Peak discharge = 24.61 cfs
Storm frequency = 2 yrs Time to peak = 42 min
Time interval = 1 min Hyd. volume = 62,741 cuft
Inflow hyds. = 1, 2 Contrib. drain. area= 44.300 ac
' Q (cfs)
' 28.00
24.00
20.00
t 16.00
12.00
8.00
4.00
0 00
P4
Hyd. No. 4 -- 2 Year
0 10
Hyd No. 4
20 30
Hyd No. 1
40 50 60
- Hyd No. 2
70 80
Q (cfs)
28.00
24.00
20.00
16.00
12.00
8.00
4.00
-? 0.00
90
Time (min)
Hydrograph Report
8
Hydraflow Hydrographs by Intelisolve v9.02
Hyd. No. 5
POND
Hydrograph type = Combine
¦ Storm frequency = 2 yrs
¦ Time interval = 1 min
Inflow hyds. = 3, 4

Q (cfs)
28.00
24.00
20.00
16.00
12.00
' 8.00 -
4.00 -
0 00
POND
Hyd. No. 5 -- 2 Year
0 10
' - Hyd No. 5
Friday, Jun 6, 2008
Peak discharge = 24.61 cfs
Time to peak = 42 min
Hyd. volume = 65,181 cuft
Contrib. drain. area= 1.910 ac
20 30
Hyd No. 3
40 50 60
- Hyd No. 4
70 80
Q (cfs)
28.00
24.00
20.00
16.00
12.00
8.00
4.00
-?- 0.00
90
Time (min)

Hydrograph Report
9
Hydraflow Hydrographs by Intelisolve v9.02 Friday, Jun 6, 2008
Hyd. No. 6
ROUTED RUNOFF
Hydrograph type = Reservoir Peak discharge = 11.35 cfs
Storm frequency = 2 yrs Time to peak = 61 min
Time interval = 1 min Hyd. volume = 65,106 cuft
Inflow hyd. No. = 5 -POND Max. Elevation = 132.77 ft
¦ Reservoir name = <New Pond> Max. Storage = 40,712 cuft
Storage Indication method used
Q (cfs)
28.00
24.00
20.00
16.00
12.00
8.00
4.00
0 00
ROUTED RUNOFF
Hyd. No. 6 -- 2 Year
0.00
0 60
' - - -- Hyd No. 6
¦
120 180 240 300 360 420 480
- Hyd No. 5 11111111111! Total storage used = 40,712 cuft
540
Time (min)
10
H yd ro g ra p h Summary Report Hydraflow Hydrographs by Intelisolve v9.02
Hyd. j Hydrograph Peak Time Time to I Hyd. j Inflow ( Maximum j Total i Hydrograph j
SIC. hype tow inter,ai peak volume hyd(s?, ! °_levat:cn Sirge used description
origin:i cfs ;;ruin) (mini lcutt`, ;tt+ ;cult`
11
Hyrlrograph Report
Hydraflow Hydrograpns by Intelisolve v9.02
Hyd, No, I
Da--1 Offsite Residentiai
Friday, Jun 6, 2008
Hydrograph type = Rational
Storm frequency = 10 yrs
Time interval = 1 min
Drainage area = 20.800 ac
Intensity = 3.111 in/hr
OF Curve = Raleigh.IDF
Q (cfs)
18.00
' 15.00
12.00
9.00
6.00
' 3.00
0 00
Da-1 Offsite Residential
Hyd. No. 1 -10 Year
0 10
- Hyd No. 1
Peak discharge = 16.18 cfs
Time to peak = 36 min
Hyd. volume = 34,940 cult
Runoff coeff. = 0.25
Tc by User = 36.00 min
Asc/Rec limb fact = 1/1
20 30 40 50 60 70
Q (cfs)
18.00
15.00
12.00
9.00
6.00
3.00
-?- 0.00
80
Time (min)
12
HydrOgraph Repo
Hydratlow Hydrographs by !ntelisolve v9.02
Hyd. No. 2
Da-2 Gnsite F=arm 'La; c'
Hydrograph type = Rational
Storm frequency = 10 yrs
1 Time interval = 1 min
Drainage area = 23.500 ac
Intensity = 2.832 in/hr
OF Curve = Raleigh.IDF
Friday.. Jun 6, 2008
Peak discharge = 19.96 cfs
Time to peak = 42 min
Hyd. volume = 50,308 cuft
Runoff coeff. = 0.3
Tc by User = 42.00 min
Asc/Rec limb fact = 1/1
I Q (Cfs)
Da-2 Offsite Farm Land
Hyd. No., 2 -- 10 Year
0 10 20
- Hyd No. 2
30 40 50 60 70 80
Q (cfs)
21.00
18.00
15.00
12.00
9.00
6.00
3.00
-? 0.00
90
Time (min)
13
Hydrograph Report
Hydraflow Hydrographs by Intelisolve x9.02
Hyd. No, 3
Da-3 Pond Area
'
Hydrograph type = Rational
Storm frequency = 10 yrs
Time interval = 1 min
Drainage area = 1.910 ac
Intensity = 6.763 in/hr
' OF Curve = Raleigh.IDF
Friday, Jun 6, 2008
Peak discharge = 6.200 cfs
Time to peak = 6 min
Hyd. volume = 2,232 cult
Runoff coeff. = 0.48
Tc by User = 6.00 min
Asc/Rec limb fact = 1/1
Da-3 Pond Area
' Q (cfs) Hyd. No. 3 -- 10 Year
7.00
6.00
' / .0011-
5.00
4.00
' 3.00
2.00
1.00
0 00 -4/
Q (cfs)
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0 1 2 3
---- Hyd No. 3
4 5 6 7 8 9 10 11
-%-- 0.00
12
Time (min)
14
Hydrograph Report
Hydrarlow Hydrographs by lnteiisolve v9.02
lid. No. 4
P4
Hydrograph type = Combine
Storm frequency = 10 yrs
Time interval = 1 min
Inflow hyds. = 1, 2
t Q (cfs)
35.00
' 30.00
' 25.00
20.00
15.00
10.00
5.00
l
n nn
P4
Hyd. No. 4 --10 Year
Q (cfs)
35.00
30.00
25.00
20.00
15.00
10.00
5M

Friday, Jun 6, 2008
Peak discharge = 33.44 cfs
Time to peak = 42 min
Hyd. volume = 85,248 cuft
Contrib. drain. area= 44.300 ac
Hyd No. 4
20 30 40 50 60
Hyd No. 1 Hyd No. 2
70 80
"- 0.00
90
Time (min)
15
I Hydrograph Report
Hydraflow Hydrograpns by Inte!iscive v9.02

POND
'
Hydrograph type _ Combine
Storm frequency = 10 yrs
' Time interval = 1 min
Inflow hyds. = 3, 4

' Q (cfs)
35.00
' 30.00
25.00
20.00
15.00
' 10.00
5.00
0 00
POND
Hyd. No. 5 -- 10 Year
Q (cfs)
35.00
Friday, Jun 6, 2008
Peak discharge = 33.44 cfs
Time to peak = 42 min
Hyd. volume = 88,451 cuft
Contrib. drain. area= 1.910 ac
' 0 10 20 30 40 50 60
-- Hyd No. 5 Hyd No. 3 Hyd No. 4
30.00
25.00
20.00
15.00
10.00
5.00
70 80
-1- 0.00
90
Time (min)
16
HydrOgraph Repoft
Hydraflow Hydrographs by Intelisolve x9.02
}-rya. No. 6
ROUTED RUNOFF
Hydrograph type = Reservoir
Storm frequency = 10 yrs
' Time interval = 1 min
Inflow hyd. No. = 5 -POND
Reservoir name = <New Pond>

Friday, Jun 6, 2008
Peak discharge = 14.80 cfs
Time to peak = 59 min
Hyd. volume = 88,374 cult
Max. Elevation = 133.31 ft
Max. Storage = 54,332 cult
e Storage Indication method used.
Q (cfs)
35.00
' 30.00
25.00
20.00
15.00
10.00
5.00 '
i
Q (cfs)
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00 -'..,?-.?,
' 0 60
- Hyd No. 6
ROUTED RUNOFF
Hyd. No. 6 --10 Year
120 180 240 300 360 420 480
Hyd No. 5 Total storage used = 54,332 cuff
540
Time (min)
17
Hydrograph Summary Report
Hyd. Hydrograph Pea k j Time Time to Hyd. ( Inflow
rroe 9c . nterral ' peak volume
orgin; c*s rrml (min) c-r=;
Hydraflow Hydrographs by Intelisolve v9.02
Maximum Total Hydrograph
S!evation strge used descrictien
7,cuftj
1 Rational 18.23 1 36 39,379
- Da-1 Offsite Residential
!?
2 Rational 22.61 1 42 56,969 - Da-2 Offsite Farm Land
3 Rational 6.816 1 6 2,454 - - - Da-3 Pond Area
4 Combine 37.80 1 42 96,348 1, 2, P4
5 Combine 37.80 1 42 99,901 3,4 POND
6

i Reservoir 15.18 1 64 99,823 5 133.62 62,428 ROUTED RUNOFF
I
i
I
I
I
P070044 Lakewood Subdivision Sign Pon -gWurn Period: 25 Year Friday, Jun 6, 2008
18
I Hydragraph Report
Hydraflcw hydregraphs by Intelisclve v9.02

Da-1 Offsite Residential
1
Hydrograph type Rational
Storm frequency = 25 yrs
1 Time interval = 1 min
Drainage area = 20.800 ac
Intensity = 3.506 in/hr
1 IDF Curve = Raleigh.IDF
i
1
1 Q(GfS)
Friday, Jun 6, 2008
Peak discharge = 18.23 cfs
Time to peak = 36 min
Hyd. volume = 39,379 cult
Runoff coeff. = 0.25
Tc by User = 36.00 min
Asc/Rec limb fact = 1/1
Da-1 Offsite Residential
Hyd. No. 1 -- 25 Year
0 10 20
i
Hyd No. 1
30 40 50 60 70
Q (cfs)
21.00
18.00
15.00
12.00
9.00
6.00
3.00
d- 0.00
80
Time (min)
Hydr®graph Report
Hydraflov? Hydrograpns by intelisolve v9.02
Hyd. No, 2
Da-2 Offsite Farm Land
Hydrograph type = Rational
Storm frequency = 25 yrs
Time interval = 1 min
Drainage area = 23.500 ac
' Intensity = 3.207 in/hr
OF Curve = Raleigh.IDF
0 cfs
19
Friday. Jun 6. 2005
Peak discharge = 22.61 cfs
Time to peak = 42 min
Hyd. volume = 56,969 cult
Runoff coeff. = 0.3
Tc by User = 42.00 min
Asc/Rec limb fact = 1/1
Da-2 Offsite Farm Land
Hyd. No. 2 - 25 Year
0 (cfs)
24.00
20.00
16.00
12.00
8.00
4.00
0 10
' Hyd No. 2
20 30 40 50 60 70 80
-1 0.00
90
Time (min)
Hy drograph
? Report
Hydra low Hydregraphs by Inte!isolve v9.02
Hyd. No. 3
' Da-3 Pond Area
Hydrograph type = Rational
Storm frequency = 25 yrs
Time interval = 1 min
Drainage area = 1.910 ac
' Intensity = 7.434 in/hr
OF Curve = Raleigh.IDF

Q (cfs)
L 7.00
6.00
5.00
4.00
3.00
2.00
' 1.00
0 00
Da-3 Pond Area
Hyd. No. 3 - 25 Year
20
Friday. Jun 6. 2008
Peak discharge = 6.816 cfs
Time to peak = 6 min
Hyd. volume = 2,454 cuft
Runoff coeff. = 0.48
Tc by User = 6.00 min
Asc/Rec limb fact = 1/1
Q (cfs)
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0 1 2
' - Hyd No. 3
3 4 5 6 7 8 9 10 11
-X-- 0.00
12
Time (min)
21
Hydrograph Report
Hvdraflow Hydrographs by Intelisolve v9.02
Hyd. No. -4
P4
Hydrograph type = Combine
Storm frequency = 25 yrs
Time interval = 1 min
Inflow hyds. = 1, 2
Q (cfs)
40.00
30.00
20.00
10.00
Q (cfs)
40.00
30.00
20.00
10.00
0.00 ?f i i' • - 0.00
0 10 20 30 40 50 60 70 80 90
Time (min)
- Hyd No. 4 Hyd No. 1 Hyd No. 2
P4
Hyd. No. 4 - 25 Year
Friday. Jun 6. 2005
Peak discharge = 37.80 cfs
Time to peak = 42 min
Hyd. volume = 96,348 cult
Contrib. drain. area = 44.300 ac
22
Hydrograph Report
Hydraflow Hydrographs by intelisolve v9.02
Hyd. No. 5
POND
Hydrograph type = Combine
Storm frequency = 25 yrs
Time interval = 1 min
Inflow hyds. = 3, 4
Q (cfs)
40.00
30.00
20.00
10.00
0.00 r- -?
0 10
- Hyd No. 5
Friday. Jun 6. 2008
Peak discharge = 37.80 cfs
Time to peak = 42 min
Hyd. volume = 99,901 cult
Contrib. drain. area= 1.910 ac
POND
Hyd. No. 5 -- 25 Year
20 30
Hyd No. 3
40 50 60
-- Hyd No. 4
70 80
Q (cfs)
40.00
30.00
20.00
10.00
0.00
90
Time (min)
23
Hydrograph Report

Hydraflow Hydrographs by Intelisolve v9.02 Friday, Jun 6, 2008
Hyd. No. 6
ROUTED RUNOFF
Hydrograph type = Reservoir Peak discharge
Time to peak = 15.18 cfs
= 64 min
Storm frequency = 25 yrs Hyd. volume = 99,823 cult
Time interval
No.
Inflow hyd = 1 min
= 5 -POND Max. Elevation = 133.62 ft
.
Reservoir name = <New Pond> Max. Storage = 62,428 cult
Storage Indication method used.
ROUTED RUNOFF
Q (S)
Q (Cfs) Hyd. No. 6 -- 25 Year
40.00
40.00
t?
?

30.00
30.00

t
20.00
20.00

10.00
10.00

E
? t
. ?
? - -
i - -- - -
0.00
0.00
0
60 120 -
180 240 300 360 420 480
540
Time (min)
- Hyd No. 6 - Hyd No. 5 Total storage used = 62,428 tuft
I Nydrograph Summary Report
iiyd.' Hydrograoh Peak
?Ve. type flow
(origin) (cfs

Time 'Time to Hyd. I Inflow ' Maximum Total
inter,,al peak voiume '"Wdlsi elevation serge used
(min) (min) (cuff; (ft) (cuft)
24
Hvdraflo4ti 'Hydro graphs by Intelisolve V9.02
Hydrograph
description
1 Rational 20.98 1 36 45,315 - Da-1 Offsite Residential
2 Rational 26.21 1 42 66,042 - Da-2 Offsite Farm Land
3 Rational 7.567 1 6 2,724 - Da-3 Pond Area
4 Combine 4169 1 42 111,356 1, 2, P4
5 Combine 43.69 1 42 115,346 3,4 POND
6
I Reservoir 16.74 1 64 115,267 5 134.03 73,166 ROUTED RUNOFF
P070044 Lakewood Subdivision Sign Pond .gloWurn Period: 100 Year Friday. Jun 6; 2008
25
Hydr®graph Report
Hydraflow Hydr ographs by Intelisolve v9.02
Friday. Jur a. 2008
Hyd. No. 1
Da-1 Offsite Residential
Hydrograph type = Rational
Storm frequency = 100 yrs
'
Time interval = 1 min
Drainage area = 20.800 ac
intensity = 4.034 in/hr
OF Curve = Raleigh.lDF
Peak discharge = 20.98 cfs
Time to peak = 36 min
Hyd. volume = 45,315 cuft
Runoff coeff. = 0.25
Tc by User = 36.00 min
Asc/Rec limb fact = 1/1
' Da-1 Offsite Residential Q (GFS)
Q (cfs) Hyd. No. 1 --100 Year
21.00
' 21.00
18.00
18.00
'
15.00 15.00
' 12.00
12.00
9.00
a 0n
6.00
6.00
3.00
3.00
I i
0.00
0.00 70 80
O 10 20 30 40 50 60 Time (min)
' - Hyd No. 1
Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.02
Hyd. No. 2
Da-2 Offsite Farm Land
Hydrograph type = Rational
Storm frequency = 100 yrs
Time interval = 1 min
Drainage area = 23.500 ac
Intensity = 3.717 in/hr
OF Curve = Raleigh.IDF

Q (cfs)
Da-2 Offsite Farm Land
Hyd. No. 2 -100 Year
26
Friday. Jun S. 2008
Peak discharge = 26.21 cfs
Time to peak = 42 min
Hyd. volume = 66,042 cult
Runoff coeff. = 0.3
Tc by User = 42.00 min
Asc/Rec limb fact = 1/1
Q (cfs)
28.00
24.00
20.00
16.00
12.00
8.00
4.00
0 10
Hyd No. 2
20 30 40 50 60 70 80
0.00
90
Time (min)
Hydrograph Report
Hydraflow Hydrographs by Intelisolve V9.02
Hyd. No. 3
Da-3 Pond Area
Hydrograph type = Rational
Storm frequency = 100 yrs
Time interval = 1 min
Drainage area = 1.910 ac
Intensity = 8.253 in/hr
OF Curve = Raleigh.IDF

Q (cfs)
8.00
6.00
4.00
2.00
0 00
27
Friday. Jun 6. 2008
Peak discharge = 7.567 cfs
Time to peak = 6 min
Hyd. volume = 2,724 cult
Runoff coeff. = 0.48
Tc by User = 6.00 min
Asc/Rec limb fact = 1/1
Da-3 Pond Area
Hyd. No. 3 -- 100 Year
0 1 2 3
-= Hyd No. 3
4 5 6 7 8 9 10 11
Q (cfs)
8.00
6.00
4.00
2.00
Y- 0.00
12
Time (min)
Wydrograph Report
Hydraflow Hydroaraphs by Intelisolve v9.02
Hyd. No. 4
P4
Hydrograph type = Combine
Storm frequency = 100 yrs
Time interval = 1 min
Inflow hyds. = 1, 2

28
Friday. Jun 6. 2008
Peak discharge = 43.69 cfs
Time to peak = 42 min
Hyd. volume = 111,356 cult
Contrib. drain. area= 44.300 ac
Q (cfs)
P4
Hyd. No. 4 - 100 Year
Q (cfs)
50.00
40.00
30.00
20.00
10.00
u.uu
0 10 20 30
- Hyd No. 4 Hyd No. 1
40 50 60
Hyd No. 2
70 80
--?- 0.00
90
Time (min)
Hydr®graph Report
Hydraflow Hydrographs by Intelisolve x9.02
Hyd. No. o
POND
Hydrograph type = Combine
Storm frequency = 100 yrs
Time interval = 1 min
Inflow hyds. = 3, 4
Q (cfs)
50.00
40.00
r
30.00
20.00 -
' 10.00 -
0 00 -
29
Friday Jun 6. 2008
Peak discharge = 43.69 cfs
Time to peak = 42 min
Hyd. volume = 115,346 cuft
Contrib. drain. area= 1.910 ac
POND
Hyd. No. 5 --100 Year
0 10
Hyd No. 5
Q (cfs)
50.00
40.00
30.00
20.00
10.00
20 30
Hyd No. 3
40 50 60 70
- Hyd No. 4
80
1 0.00
90
Time (min)
Hydrograph Report
Hydraflow Hydrographs by Intelisoive v9.02
Hyd. No. 06
ROUTED RUNOFF
Hydrograph type = Reservoir
Storm frequency = 100 yrs
Time interval = 1 m?n
Inflow hyd. No. = 5 -POND
¦ Reservoir name = <New Pond>
Storage Indication method used
Peak discharge
Time to peak
Hyd. volume
Max. Elevation
Max. Storage
30
Friday. Jun. 6. 2005
= 16.74 cfs
= 64 min
= 115,267 cult
= 134.03 ft
= 73,166 cult
ROUTED RUNOFF
Hyd. No. 6 -- 100 Year Q (cfs)
50.00
40.00
t
k 30.00
¢` LV.UV
6
p
10.00
0.00
0 60 120 180 240 300 360 420 480 540
Time (min)
Hyd No. 6 ??? _ Hyd No. 5 Total storage used = 73.166 cult
P4 - TWIN 24" RCP'S
DESIGN Q FOR 25 YEAR STORM
Q(25)= 37.8 CFS StormCad
18.9 cfs for Twin Pipes
HEADWATER CHECK
Pipe Size = 24 "RCP
H/W = 1.4 CHART SD-13 (CRM)
HW = 2.80
MAX ALLOWED = 3>2.80, OK
EROSION CONTROL
V= 12.5
ZONE= 2 Figure *.06.b.1
Stone Class = B Figure *.06.b.2
Class A B 1 II
Dmax 6 12 20 24
Depth 10 22 48 48
LENGTH OF APRON
zone class Inlet Outlet
1 A 6 8
2 B 6 12
3 1 med. 8 16
4 1 heavy 8 16
5 2 heavy 10 20
6 2heavy 12 20
P4 - Twin 24"RCP's
Wcrks, eet fcr Circular Channel
^-cject Desc,`, ?ucr
Project File j:\phillip\haestad\fmw\p070044.fm2
Worksheet P4 - Twin 24"RCP's
Flow Element Circular Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.013
Channel Slope 0.030000 ft/ft
Diameter 24.00 in
Discharge 19.80 cfs
Results
Depth 1.01 ft
Flow Area 1.58 ft2
Wetted Perimeter 3.15 ft
Top Width 2.00 ft
Critical Depth 1.60 ft
Percent Full 50.31
Critical Slope 0.008030 ft/ft
Velocity 12.50 ft/s
Velocity Head 2.43 ft
Specific Energy 3.44 ft
Froude Number 2.48
Maximum Discharge 42.15 cfs
Full Flow Capacity 39.18 cfs
Full Flow Slope 0.007661 ft/ft
Flow is supercritical.
06/06/08
10:44:30 AM
FlowMaster v5.15
Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1
P5 - 15" RICP
DESIGN Q FOR 10 YEAR STORM
Q(10)= 1.1 3 C F S Da-6, Q=CIA
HEADWATER CHECK
Pipe Size = 15 "RCP
H/W = 0.58 CHART SD-B (CRM)
HW = 0.73
MAX ALLOWED = 2>0.73, OK
EROSION CONTROL
V= 6.0
ZONE= 1 Figure *.06.b.1
Stone Class = A Figure *.06.b_2
Class A B 1 II
Dmax 6 12 20 24
Depth 10 22 48 48
LENGTH OF APRON
zone class Inlet Outlet
1 A 3.75 5
2 B 3.75 7.5
3 1 med. 5 10
4 1 heavy 5 10
5 2 heavy 6.25 12.5
6 2heavy 7.5 12.5
P5
Worksheet fcr Circular Channel
ciec; :?esc,iPicr
Project File j:\phi1lip\haestad\fmw\p070044.fm2
Worksheet P5
Flow Element Circular Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.013
Channel Slope 0.023000 ft/ft
Diameter 15.00 in
Discharge 1.73 cfs
Results
Depth 0.36 ft
Flow Area 0.29 ft2
Wetted Perimeter 1.41 ft
Top Width 1.13 ft
Critical Depth 0.52 ft
Percent Full 28.45
Critical Slope 0.005388 ft/ft
Velocity 6.02 ft/s
Velocity Head 0.56 ft
Specific Energy 0.92 ft
Froude Number 2.10
Maximum Discharge 10.54 cfs
Full Flow Capacity 9.80 cfs
Full Flow Slope 0.000717 ft/ft
Flow is supercritical.
L
L
1
I
06/06/08
10:13:00 AM
FlowMaster v5.15
Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1
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