20070193 Ver 1_Stormwater Info_20070131

~' ~ Q 70 1 ~ 3
DRAINAGE SYS1`EM
CALCULATIONS
WakeMed Apex Healthplex
Apex, NC
BBM Project No.: BBH001.000
Storm Drainage / HGL Calculations
Wet Detention Pond Design
Erosion Control Calculations
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December 06, 2006

Table of Contents BBHOO,.gpw
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hydrograph Return Period Recap ...................................................................... 1
1 -Year
Summary Report ................................................................................................................. 2
Hydrograph Reports ........................................................................................................... 3
Hydrograph No. 1, SCS Runoff, New Pre-Development .................................................. 3
TR-55 Tc Worksheet .................................................................................................... 4
Hydrograph No. 2, SCS Runoff, New Post-Development ................................................ . 5
TR-55 Tc Worksheet .................................................................................................... 6
Hydrograph No. 3, SCS Runoff, Existing Pre-Development ............................................. 7
TR-55 Tc Worksheet .................................................................................................... 8
Hydrograph No. 4, SCS Runoff, Existing Post-Deelopment ............................................. 9
TR-55 Tc Worksheet .................................................................................................. 10
Hydrograph No. 5, Reservoir, Existing Pond -Pre ......................................................... 11
Pond Report ............................................................................................................... 12
Hydrograph No. 6, Reservoir, Existing Pond -Post ........................................................ 13
Pond Report ...................................................:..............................................:............ 14
Hydrograph No. 7, Reservoir, New Pond -Post ............................................................. 15
Pond Report ............................................................................................................... 16
10 -Year
Summary Report ............................................................................................................... 17
Hydrograph Reports ......................................................................................................... 18
Hydrograph No. 1, SCS Runoff, New Pre-Development ................................................ 18
TR-55 Tc Worksheet .................................................................................................. 19
Hydrograph No. 2, SCS Runoff, New Post-Development ............................................... 20
TR-55 Tc Worksheet .................................................................................................. 21
Hydrograph No. 3, SCS Runoff, Existing Pre-Development ........................................... 22
TR-55 Tc Worksheet .................................................................................................. 23
Hydrograph No. 4, SCS Runoff, Existing Post-Deelopment ........................................... 24
TR-55 Tc Worksheet .................................................................................................. 25
Hydrograph No. 5, Reservoir, Existing Pond -Pre ......................................................... 26
Pond Report ............................................................................................................... 27
Hydrograph No. 6, Reservoir, Existing Pond -Post ........................................................ 28
Pond Report ................................................................:.............................................. 29
Hydrograph No. 7, Reservoir, New Pond -Post ............................................................. 30
Pond Report ............................................................................................................... 31
50 -Year
Summary Report ............................................................................................................... 32
Hydrograph Reports ......................................................................................................... 33
Hydrograph No. 1, SCS Runoff, New Pre-Development ................................................ 33
TR-55 Tc Worksheet .................................................................................................. 34
Hydrograph No. 2, SCS Runoff, New Post-Development ............................................... 35
TR-55 Tc Worksheet .................................................................................................. 36
Hydrograph No. 3, SCS Runoff, Existing Pre-Development ........................................... 37
TR-55 Tc Worksheet .................................................................................................. 38
Hydrograph No. 4, SCS Runoff, Existing Post-Deelopment ........................................... 39

Contents
BBH001.gpw
TR-55 Tc Worksheet .................................................................................................. 40
Hydrograph No. 5, Reservoir, Existing Pond -Pre ....:.................................................... 41
Pond Report .................................................................:............................................. 42
Hydrograph No. 6, Reservoir, Existing Pond -Post ........................................................ 43
Pond Report ............................................................................................................... 44
Hydrograph No. 7, Reservoir, New Pond -Post ............................................................. 45
Pond Report ............................................................................................................... 46

Hydrograph Return Period Recap
Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph

No. type Hyd(s) description
(origin) 1-Yr 2-Yr 3-Yr 5-Yr 10-Yr 25-Yr 50-Yr 100-Yr
1 SCS Runoff --- 2.253 --- ------ ----- 10.69 - 18.76 ----- New Pre-Development
2 SCS Runoff --- 24.65 ------ -- ------ 52.15 73.13 ----- New Post-Development
3 SCS Runoff -- 44.16 --- -- ---- 102.73 --- 148.40 ----- .Existing Pre-Development
4 SCS Runoff ---- 53.03 -- -- 118.00 ---- 168.08 -- Existing Post-Deelopment
5 Reservoir 3 0.302 ---- - --- 5.620 -- 51.24 ------ Existing Pond --Pre
6 Reservoir 4 0.335 --- ---- -- 13.18 -- 82.52 ----- Existing Pond -Post
7 Reservoir 2 2.076 ----- -- ------ 10.26 -- 49.28 --- New Pond -Post
Proj. file: BBH001.gpw Tuesday, Jan 30 2007, 2:21 PM
Hydraflow Hydrographs by Intelisolve

Hydrograph Summary Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(tuft) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(tuft) Hydrograph
description
1 SCS Runoff 2.253 2 746 17,420 - --- --- New Pre-Development
2 SCS Runoff 24.65 1 715 44,550 -- --- --- New Post-Development
3 SCS Runoff 44.16 2 716 89,219 - ------ Existing Pre-Development
4 SCS Runoff 53.03 2 716 107,551 - Existing Post-Deelopment
5 Reservoir 0.302 2 1442 68,381 3 411.77 257,030 Existing Pond -Pre
6 .Reservoir 0.335 2 1442 79,035 4 412.14 273,803 Existing Pond -Post
7 Reservoir 2.076 1 742 34,819 2 383.85 52,564 New Pond -Post
BBH001.gpw Return Period: 1 Year Tuesday, Jan 30 2007, 2:21 PM
Hydraflow Hydrographs by Intelisolve

Hydrograph Plot 3
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 1
New Pre-Development
Hydrograph type = SCS Runoff Peak discharge = 2.253 cfs
Storm frequency = 1 yrs Time interval = 2 min
Drainage area = 8.810 ac Curve number = 66
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 49.70 min
Total precip. = 3.00 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 17,420 tuft
New Pre-Development
Q (cfs)
Hyd. No. 1 --1 Yr
3.00
2.00
1.00
0.00 '
0 3
Hyd No. 1
Q (cfs)
3.00
2.00
1.00
0.00
5 8 11 13 16 19 21 24 27
Time (hrs)

TR55 Tc Worksheet
4
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
New Pre-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.800 0.011 0.011
Flow length (ft) = 275.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 7.30 0.00 0.00
Travel Time (min) = 47.17 + 0.00 + 0.00 = 47.17
Shallow Concentrated Flow
Flow length (ft) = 467.00 0.00 0.00
Watercourse slope (%) = 6.80 0.00 0.00
Surface description =Unpaved Paved Paved
Average velocity (ft/s) = 4.21 0.00 0.00
Travel Time (min) = 1.85 + 0.00 + 0.00 = 1.85
Channel Flow
X sectional flow area (sgft) = 6.00 0.00 0.00
Wetted perimeter (ft) = 4.00 0.00 0.00
Channel slope (%) = 3.60 0.00 0.00
Manning's n-value = 0.050 0.015 0.015
Velocity (ft/s) = 7.42 0.00 0.00
Flow length (ft) = 318.0 0.0 0.0
Travel Time (min) = 0.71 + 0.00 + 0.00 = 0.71
Total Travel Time, Tc .............. ........................ ..................... ................... 49.70 min

Hydrograph Plot
5
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 2
New Post-Development
Hydrograph type = SCS Runoff Peak discharge = 24.65 cfs
Storm frequency = 1 yrs Time interval = 1 min
Drainage area = 7.200 ac Curve number = 88
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 1.80 min
Total precip. = 3.00 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 44,550 tuft
New Post-Development
Q (cfs) Hyd. No. 2 -- 1 Yr Q (cfs)
28.00
24.00
20.00
16.00
12.00
8.00
4.00
0 00
28.00
24.00
20.00
16.00
12.00
8.00
4.00
0 00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Hyd No. 2 Time (hrs)

TR55 Tc Worksheet
6
Hydraflow Hydrographs by Intelisolve
Hyd. No. 2
New Post-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 0.0 0.0 0.0
Two-year 24-hr precip. (in) = 0.00 0.00 0.00
Land slope (%) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Shallow Concentrated Flow
Flow length (ft) = 260.00 0.00 0.00
Watercourse slope (%) = 8.80 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 6.03 0.00 0.00
Travel Time (min) = 0.72 + 0.00 + 0.00 = 0.72
Channel Flow
X sectional flow area (sgft) = 1.77 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 3.50 0.00 0.00
Manning's n-value = 0.015 0.015 0.015
Velocity (ft/s) = 9.65 0.00 0.00
Flow length (ft) = 647.0 0.0 0.0
Travel Time (min) = 1.12 + 0.00 + 0.00 = 1.12
Total Travel Time, Tc .............................. ................................................ 1.80 min

Hydrograph Plot
7
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 3
Existing Pre-Deve lopment
Hydrograph type = SCS Runoff Peak discharge = 44.16 cfs
Storm frequency = 1 yrs Time interval = 2 min
Drainage area = 17.290 ac Curve number = 84
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 6.30 min
Total precip. = 3.00 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 89,219 tuft
Q (cfs)
50.00
Existing Pre-Development
Hyd. No. 3 -- 1 Yr
40.00
30.00
20.00
10.00
0.00 ~
0
2 5
Hyd No. 3
7 9
Q (cfs)
50.00
40.00
30.00
20.00
10.00
' 0.00
12 14 16 19 21 23 26
Time (hrs)

TR55 Tc Worksheet
8
Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Existing Pre-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 115.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 24.00 0.00 0.00
Travel Time (min) = 3.82 + 0.00 + 0.00 = 3.82
Shallow Concentrated Flow
Flow length (ft) = 0.00 0.00 0.00
Watercourse slope (%) = 0.00 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Channel Flow
X sectional flow area (sgft) = 1.76 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 1.90 0.00 0.00
Manning's n-value = 0.013 0.015 0.015
Velocity (ft/s) = 8.17 0.00 0.00
Flow length (ft) = 1238.0 0.0 0.0
Travel Time (min) = 2.53 + 0.00 + 0.00 = 2.53
Total Travel Time, Tc ............. .............................................. ................... 6.30 min

Hydrograph Plot
9
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 4
Existing Post-Dee lopment
Hydrograph type = SCS Runoff Peak discharge 53.03 cfs
Storm frequency = 1 yrs Time interval = 2 min
Drainage area = 19.010 ac Curve number = 86
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 6.30 min
Total precip. = 3.00 in .Distribution = Type. II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 107,551 cult
Existing Post-Deelopment
Q (cfs) Hyd. No. 4 -- 1 Yr Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0.00
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0.0 2.3 4.7 7.0 9.3 11.7 14.0 16.3 18.7 21.0 23.3
Time (hrs)
Hyd No. 4

TR55 Tc Worksheet
10
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
Existing Post-Deelopment
Descriution A B C .Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 115.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 24.00 0.00 0.00
Travel Time (min) = 3.82 + 0.00 + 0.00 = 3.82
Shallow Concentrated Flow
Flow length (ft) = 0.00 0.00 0.00
Watercourse slope (%) = 0.00 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Channel Flow
X sectional flow area (sgft) = 1.76 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 1.90 0.00 0.00
Manning's n-value = 0.013 0.015 0.015
Velocity (ft/s) = 8.17 0.00 0.00
Flow length (ft) = 1238.0 0.0 0.0
Travel Time (min) = 2.53 + 0.00 + 0.00 = 2.53
Total Travel Time, Tc ............. .............................................. ................... 6.30 min

Hydrograph Plot
11
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 5
Existing Pond -Pre
Hydrograph type =Reservoir Peak discharge = 0.302 cfs
Storm frequency = 1 yrs Time interval = 2 min
Inflow hyd. No. = 3 Max. Elevation = 411.77 ft
Reservoir name =Existing Pond Max. Storage = 257,030 cult
Storage Indication method used. Wet pond routing start elevation = 410.00 ft. Hydrograph Volume = 68,381 tuft
Existing Pond -Pre
Q (cfs) Hyd. No. 5 --1 Yr
50.00
40.00
30.00
20.00
10.00
0.00 ' ''
0 10 19 29 39 48 58 68 77
Hyd No. 5 Hyd No. 3
Q (cfs)
50.00
40.00
30.00
20.00
10.00
~i 0.00
87 97
Time (hrs)

Pond Report
12
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 1 -Existing Pond
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cuff) Total storage (tuft)
0.00 403.00 14,618 0 0
1.00 404.00 18,783 16,701 16,701
3.00 406.00 23,454 42,237 58,938
5.00 408.00 28,632 52,086 111,024
7.00 410.00 40,731 69,363 180,387
9.00 412.00 46,066 86,797 267,184
11.00 414.00 51,352 97,418 364,602
Culvert /Orifice Structures
[A] [B] [C] [D]
Rise (in) = 36.00 3.00 0.00 0.00
Span (in) = 36.00 3.00 0.00 0.00
No. Barrels = 1 1 0 0
Invert EI. (ft) = 403.60 410.00 0.00 0.00
Length (ft) = 90.00 6.00 0.00 0.00
Slope (%) = 0.60 1.00 0.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a No No No
Weir Structures
IA] IB] [Cl ID]
Crest Len (ft) = 24.00 0.00 0.00 0.00
Crest EI. (ft) = 412.80 0.00 0.00 0.00
Weir Coeff. = 3.33 3.33 0.00 3.33
Weir Type =Riser - - --
Multi-Stage =Yes No No No
Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: CulverUOr~ce outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0.00
Stage /Discharge Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Discharge (cfs)
Total O

Hydrograph Plot 13
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 302007, 2:21 PM
Hyd. No. 6
Existing Pond -Post
Hydrograph type =Reservoir Peak discharge = 0.335 cfs
Storm frequency = 1 yrs Time interval = 2 min
Inflow hyd. No. = 4 Max. Elevation = 412.14 ft
Reservoir name =Existing Pond Max. Storage = 273,803 cult
Storage Indication method used. Wet pond routing start elevation = 410.00 ft.
Hydrograph Volume = 79,035 cult
Existing Pond -Post
Q (cfs) Hyd. No. 6 -- 1 Yr Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0 00
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0 10 19 29 39 48 58 68 77 87 97
Time (hrs)
Hyd No. 6 Hyd No. 4

Pond Report
14
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 1 -Existing Pond
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) .Total storage (tuft)
0.00 403.00 14,618 0 0
1.00 404.00 18,783 16,701 16,701
3.00 406.00 23,454 42,237 58,938
5.00 408.00 28,632 52,086 111,024
7.00 410.00 40,731 69,363 180,387
9.00 412.00 46,066 86,797 267,184
11.00 414.00 51,352 97,418 364,602
Culvert I Orifice Structures
[A] [B] [C] [D]
Rise (in) = 36.00 3.00 0.00 0.00
Span (in) = 36.00 3.00 0.00 0.00
No. Barrels = 1 1 0 0
Invert EI. (ft) = 403.60 410.00 0.00 0.00
Length (ft) = 90.00 6.00 0.00 0.00
Slope (%) = 0.60 1.00 0.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a No No No
Weir Structures
[A] IB] [Cl ID]
Crest Len (ft) = 24.00 0.00 0.00 0.00
Crest EI. (ft) = 412.80 0.00 0.00 0.00
Weir Coeff. = 3.33 3.33 0.00 3.33
Weir Type =Riser -- - --
Multi-Stage =Yes No No No
Exfiltration =.0.000 in/hr (Contour) Tailwater Elev. _ .0.00 ft
Note: CuIveNOrifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft) Stage /Discharge
12.00
10.00
8.00
6.00
4.00
2.00
0.00
Stage (ft)
--- 12.00
10.00
8.00
6.00
4.00
2.00
0 00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Discharge (cfs)
Total O

Hydrograph Plot
15
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 7
New Pond -Post
Hydrograph type =Reservoir .Peak discharge = 2.076 cfs
Storm frequency = 1 yrs Time interval = 1 min
Inflow hyd. No. = 2 Max. Elevation = 383.85 ft
Reservoir name =New Pond Max. Storage = 52,564 cult
Storage Indication method used. Wet pond routing start elevation = 382.00 ft. Hydrograph Volume = 34,819 cult
Q (cfs)
28.00
24.00
20.00
16.00
12.00
8.00
4.00
0.00
New Pond -Post
Hyd. No. 7 -- 1 Yr
Q (cfs)
28.00
24.00
20.00
16.00
12.00
8.00
4.00
0 00
0 5 10 15 19 24 29 34 39 44 48
Hyd No. 7 Hyd No. 2 Time (hrs)

Pond Report 16
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 2 -New Pond
Pond Data
Pond storage is based on k nown contour a reas. Average end area method used.
Stage I Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (tuft)
0.00 379.00 7,700 0 0
1.00 380.00 8,906 8,303 8,303
3.00 382.00 11,487 20,393 28,696
5.00 384.00 14,294 25,781 54,477
7.00 386.00 17,328 31,622 86,099
7.50 386.50 21,000 9,582 95,681
Culvert /Orifice Structures Weir Structures.
G°-l IB] [C] IDl IA] IBl [C] IDl
Rise (in) = 30.00 2.00 6.00 0.00 Crest Len (ft) = 24.00 0.00 0.00 0.00
Span (in) = 30.00 2.00 8.00 0.00 Crest EI. (ft) = 385.50 0.00 0.00 0.00
No. Barrels = 1 1 4 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert EI. (ft) = 379.00 382.00 383.50 0.00 Weir Type =Riser --- - --
Length (ft) = 132.00 1.00 1.00 0.00 Multi-Stage =Yes No No No
Slope (%) = 0.22 1.00 1.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a Yes Yes No Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: CuIveNOr'~ce outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions
Stage (ft)
8.00
6.00
4.00
2.00
0.00
0.00
Stage /Discharge
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90
Total Q
Stage (ft)
1.00 V vv
Discharge (cfs)

17
Hydrograph Summary Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(tuft) Inflow
hyd(s) Maximum
elevation
(ft) .Maximum
storage
(tuft) Hydrograph
description
1 SCS Runoff 10.69 2 744 63,683 - - - New Pre-Development
2 SCS Runoff 52.15 1 715 98,770 -- -- -- New Post-Development
3 SCS Runoff 102.73 2 716 212,990 -- - --- Existing Pre-Development
4 SCS Runoff 118.00 2 716 247,329 - - - Existing Post-Deelopment
5 Reservoir 5.620 2 770 166,829 3 412.95 313,265 Existing Pond -Pre
6 Reservoir 13.18 2 736 201,134 4 413.09 320,083 Existing Pond -Post
7 Reservoir 10.26 1 722 88,616 2 385.52 78,520 New Pond -Post
BBH001.gpw Return Period: 10 Year Tuesday, Jan 30 2007, 2:21 PM
Hydraflow Hydrographs by Intelisolve

18
Hydrograph Plot
Hydraflow Hydrographs by Intelisotve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 1
New Pre-Development
Hydrograph type = SCS Runoff Peak discharge = 10.69 cfs
Storm frequency = 10 yrs Time interval = 2 min
Drainage area = 8.810 ac Curve number = 66
Basin Slope = 0.0 % .Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 49.70 min
Total precip. = 5.38 in Distribution = -Type I I
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 63,683 tuft
New Pre-Development
Q (cfs) Hyd. No. 1 --10 Yr
12.00
10.00
8.00
6.00
4.00
2.00
0 00
Q (cfs)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
0 2 5 7 9 12 14 16 19 21 23 26
Hyd No. 1 Time (hrs)

TR55 Tc Worksheet
19
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
New Pre-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.800 0.011 0.011
Flow length (ft) = 275.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 7.30 0.00 0.00
Travel Time (min) = 47.17 + 0.00 + 0.00 = 47.17
Shallow Concentrated Flow
Flow length (ft) = 467.00 0.00 0.00
Watercourse slope (%) = 6.80 0.00 0.00
Surface description =Unpaved Paved Paved
Average velocity (ft/s) = 4.21 0.00 0.00
Travel Time (min) = 1.85 + 0.00 + 0.00 = 1.85
Channel Flow
X sectional flow area (sgft) = 6.00 0.00 0.00
Wetted perimeter (ft) = 4.00 0.00 0.00
Channel slope (%) = 3.60 0.00 0.00
Manning's n-value = 0.050 0.015 0.015
Velocity (ft/s) = 7.42 0.00 0.00
Flow length (ft) = 318.0 0.0 0.0
Travel Time (min) = 0.71 + 0.00 + 0.00 = 0.71
Total Travel Time, Tc .............................................................................. 49.70 min

20
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 2
New Post-Development
Hydrograph type = SCS Runoff Peak discharge = 52.15 cfs
Storm frequency = 10 yrs Time interval = 1 -min
Drainage area = 7.200 ac Curve number = 88
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 1.80 min
Total precip. = 5.38 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 98,770 cult
New Post-Development
Q (cfs)
Hyd. No. 2 - 10 Yr
60.00
50.00
40.00
30.00
20.00
10.00
0.00
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Time (hrs)
Hyd No. 2

TR55 Tc Worksheet
21
Hydraflow Hydrographs by Intelisolve
Hyd. No. 2
New Post-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 0.0 0.0 0.0
Two-year 24-hr precip. (in) = 0.00 0.00 0.00
Land slope (%) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Shallow Concentrated Flow
Flow length (ft) = 260.00 0.00 0.00
Watercourse slope (%) = 8.80 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 6.03 0.00 0.00
Travel Time (min) = 0.72 + 0.00 + 0.00 = 0.72
Channel Flow
X sectional flow area (sgft) = 1.77 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 3.50 0.00 0.00
Manning's n-value = 0.015 0.015 0.015
Velocity (ft/s) = 9.65 0.00 0.00
Flow length (ft) = 647.0 0.0 0.0
Travel Time (min) = 1.12 + 0.00 + 0.00 = 1.12
Total Travel Time, Tc ..................................... ...................... ................... 1.80 min

22
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 3
Existing Pre-Deve lopment
Hydrograph type = SCS Runoff Peak discharge = 102.73 cfs
Storm frequency = 10 yrs Time interval = 2 min
Drainage area = 17.290 ac Curve number = 84
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 6.30 min
Total precip. = 5.38 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 212,990 cult
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
0.00 ' ' 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Hyd No. 3 Time (hrs)
Existing Pre-Development
Hyd. No. 3 --10 Yr

TR55 Tc Worksheet
23
Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Existing Pre-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 115.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 24.00 0.00 0.00
Travel Time (min) = 3.82 + 0.00 + 0.00 = 3.82
Shallow Concentrated Flow
Flow length (ft) = 0.00 0.00 0.00
Watercourse slope (%) = 0.00 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Channel Flow
X sectional flow area (sgft) = 1.76 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 1.90 0.00 0.00
Manning's n-value = 0.013 0.015 0.015
Velocity (ft/s) = 8.17 0.00 0.00
Flow length (ft) = 1238.0 0.0 0.0
Travel Time (min) = 2.53 + 0.00 + 0.00 = 2.53
Total Travel Time, Tc ............. ........................ ......................................... 6.30 min

Hydrograph Plot 24
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 4
Existing Post-Dee lopment
Hydrograph type = SCS Runoff Peak discharge = 118.00 cfs
Storm frequency = 10 yrs Time interval = 2 min
Drainage area = 19.010 ac Curve number = 86
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 6.30 min
Total precip. = 5.38 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 247,329 cult
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
0.00 _ ' ' 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Hyd No. 4 Time (hrs)
Existing Post-Deelopment
Hyd. No. 4 -- 10 Yr

TR55 Tc Worksheet
25
Hyd. No. 4
Existing Post-Deelopment
Hydraflow Hydrographs by Intelisolve
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 115.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 24.00 0.00 0.00
Travel Time (min) = 3.82 + 0.00 + 0.00 = 3.82
Shallow Concentrated Flow
Flow length (ft) = 0.00 0.00 0.00
Watercourse slope (%) = 0.00 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 0.00 0.00 0..00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Channel Flow
X sectional flow area (sgft) = 1.76 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 1.90 0.00 0.00
Manning's n-value = 0.013 0.015 0.015
Velocity (ft/s) = 8.17 0.00 0.00
Flow length (ft) = 1238.0 0.0 0.0
Travel Time (min) = 2.53 + 0.00 + 0.00 = 2.53
Total Travel Time, Tc ............. ...................................... ........................... 6.30 min

26
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 5
Existing Pond -Pre
Hydrograph type =Reservoir Peak discharge = 5.620 cfs
Storm frequency = 10 yrs Time interval = 2 min
Inflow hyd. No. = 3 Max. Elevation = 412.95 ft
Reservoir name =Existing Pond Max. Storage = 313,265 cult
Storage Indication method used. Wet pond routing start elevation = 410.00 ft.
Existing Pond -Pre
Q (cfs)
Hyd. No. 5 -- 10 Yr
120.00
100.00
80.00
60.00
40.00
20.00
0.00
Hydrograph Volume = 166,829 cuff
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
0 00
0 10 19 29 39 48 58 68 77 87 97
Time (hrs)
Hyd No. 5 Hyd No. 3

Pond Report 27
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 1 -Existing Pond
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
0.00 403.00 14,618 0 0
1.00 404.00 18,783 16,701 16,701
3.00 406.00 23,454 42,237 58,938
5.00 408.00 28,632 52,086 111,024
7.00 410.00 40,731 69,363 180,387
9.00 412.00 46,066 86,797 267,184
11.00 414.00 51,352 97,418 364,602
Culvert /Orifice Structures
[A] [B] [C] (D]
Rise (in) = 36.00 3.00 0.00 0.00
Span (in) = 36.00 3.00 0.00 0.00
No. Barrels = 1 1 0 0
Invert EI. (ft) = 403.60 410.00 0.00 0.00
Length (ft) = 90.00 6.00 0.00 0.00
Slope (%) = 0.60 1.00 0.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a No No No
Weir Structures
(A] [B] [C] [D]
Crest Len (ft) = 24.00 0.00 0.00 0.00
Crest EI. (ft) = 412.80 0.00 0.00 0.00
Weir Coeff. = 3.33 3.33 0.00 3.33
Weir Type =Riser - --- --
Multi-Stage =Yes No No No
Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft) Stage /Discharge
12.00
10.00
8.00
6.00
4.00
2.00
0 00
Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Discharge (cfs)
Total Q

Hydrograph Plot 2$
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 6
Existing Pond -Post
Hydrograph type =Reservoir Peak discharge = 13.18 cfs
Storm frequency = 10 yrs Time interval = 2 min
Inflow hyd. No. = 4 Max. Elevation = 413.09 ft
Reservoir name =Existing Pond Max. Storage = 320,083 cult
Storage Indication method used. Wet pond routing start elevation = 410.00 ft.
Q (cfs)
120.00
Existing Pond -Post
Hyd. No. 6 -- 10 Yr
100.00
80.00
Hydrograph Volume = 201,134 cuff
60.00
40.00
20.00
Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
0.00 0.00
0 10 19 29 39 48 58 68 77 87 97
Time (hrs)
Hyd No. 6 Hyd No. 4

Pond Report Zs
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 1 -Existing Pond
Pond Data
Pond storage is based on known contour a reas. Average end area method used:
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (tuft) Total storage (tuft)
0.00 403.00 14,618 0 0
1.00 404.00 18,783 16,701 16,701
3.00 406.00 23,454 42,237 58,938
5.00 408.00 28,632 52,086 111,024
7.00 410.00 40,731 69,363 180,387
9.00 412.00 46,066 86,797 267,184
11.00 414.00 51,352 97,418 364,602
Culvert /Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise (in) = 36.00 3.00 0.00 0.00 Crest Len (ft) = 24.00 0.00 0.00 0.00
Span (in) = 36.00 3.00 0.00 0.00 Crest EI. (ft) = 412.80 0.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Cceff. = 3.33 3.33 0.00 3.33
Invert EI. (ft) = 403.60 410.00 0.00 0.00 Weir Type =Riser -
Length (ft) = 90.00 6.00 0.00 0.00 Multi-Stage =Yes No No No
Slope (%) = 0.60 1.00 0.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a No No No Exfiltration = 0. 000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions
Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
Stage I Discharge
Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Total Q Discharge (cfs)

30
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 7
New Pond -Post
Hydrograph type =Reservoir Peak discharge = 10.26 cfs
Storm frequency = 10 yrs Time interval = 1 min
Inflow hyd. No. = 2 Max. Elevation = 385.52 ft
Reservoir name =New Pond Max. Storage = 78,520 cult
Storage Indication method used. Wet pond routing start elevation = 382.00 ft. Hydrograph Volume = 88,616 cult
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0.00
New Pond -Post
Hyd. No. 7 -- 10 Yr
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0 4 8 12 15 19 23 27 31 35 38 42
Time (hrs)
Hyd No. 7 Hyd No. 2

Pond Report
31
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 2 -New Pond
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (tuft) Total storage (tuft)
0.00 379.00 7,700 0 0
1.00 380.00 8,906 8,303 8,303
3.00 382.00 11,487 20,393 28,696
5.00 384.00 14,294 25,781 54,477
7.00 386.00 17,328 31,622 86,099
7.50 386.50 21,000 9,582 95,681
Culvert 1 Orifice Structures
[A] [B] [C] [D]
Rise (in) = 30.00 2.00 6.00 0.00
Span (in) = 30.00 2.00 8.00 0.00
No. Barrels = 1 1 4 0
Invert EI.(ft) = 379.00 382.00 383.50 0.00
Length (ft) = 132.00 1.00 1.00 0.00
Slope (%) = 0.22 1.00 1.00 0.00
N-Value = .013 .013 .013 .000
Orif. Cceff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a Yes Yes No
Weir Structures
IA] IBl [C] ID]
Crest Len (ft) = 24.00 0.00 0.00 0.00
Crest EI. (ft) = 385.50 0.00 0.00 0.00
Weir Cceff. = 3.33 3.33 0.00 0.00
Weir Type =Riser --- --- ---
Multistage =Yes No No No
Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: CulverUOrifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft)
8.00
6.00
4.00
2.00
Stage /Discharge
Stage (ft)
0.00 .,,.,
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 V
Discharge (cfs)
Total Q

32
Hydrograph Summary Report
Hyd.
No. Hydrograph
type
(origin) Peak
flow
(cfs) Time
interval
(min) Time to
peak
(min) Volume

(tuft) Inflow
hyd(s) Maximum
elevation
(ft) Maximum
storage
(cult) Hydrograph
description
1 SCS Runoff 18.76 2 744 107,781 -- -- New Pre-Development
2 SCS Runoff 73.13 1 715 142,057 - ------ New Post-Development
3 SCS Runoff 148.40 2 716 314,188 - -- - Existing Pre-Development
4 SCS Runoff 168.08 2 716 360,202 -- --- -- Existing Post-Deelopment
5 Reservoir 51.24 2 724 267,928 3 413.54 342,010 Existing Pond -Pre
6 Reservoir 82.52 2 722 313,910 4 413.83 356,089 Existing Pond -Post
7 Reservoir 49.28 1 718 131,838 2 386.12 88,465 New Pond -Post
BBH001.gpw Return Period: 50 Year Tuesday, Jan 30 2007, 2:21 PM
Hydraflow Hydrographs by Intelisolve

Hydrograph Plot
33
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 1
New Pre-Development
Hydrograph type = SCS Runoff Peak discharge = 18.76 cfs
Storm frequency = 50 yrs Time interval = 2 min
Drainage area = 8.810 ac Curve number = 66
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 49.70 min
Total precip. = 7.21 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 107,781 cult
Q (cfs)
21.00
18.00
New Pre-Development
Hyd. No. 1 -- 50 Yr
15.00
12.00
9.00
6.00
3.00
0 00
Q (cfs)
21.00
18.00
15.00
12.00
9.00
6.00
3.00
0 00
0 2 5 7 9 12 14 16 19 21 23 26
Time (hrs)
Hyd No. 1

TR55 Tc Worksheet
34
Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
New Pre-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.800 0.011 0.011
Flow length (ft) 275.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 7.30 0.00 0.00
Travel Time (min) = 47.17 + 0.00 + 0.00 = 47.17
Shallow Concentrated Flow
Flow length (ft) = 467.00 0.00 0.00
Watercourse slope (%) = 6.80 0.00 0.00
Surface description =Unpaved Paved Paved
Average velocity (ft/s) = 4.21 0.00 0.00
Travel Time (min) = 1.85 + 0.00 + 0.00 = 1.85
Channel Flow
X sectional flow area (sgft) = 6.00 0.00 0.00
Wetted perimeter (ft) = 4.00 0.00 0.00
Channel slope (%) = 3.60 0.00 0.00
Manning's n-value = 0.050 0.015 0.015
Velocity (ft/s) = 7.42 0.00 0.00
Flow length (ft) = 318.0 0.0 0.0
Travel Time (min) = 0.71 + 0.00 + 0.00 = 0.71
Total Travel Time, Tc .............................................................................. 49.70 min

35
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 2
New Post-Development
Hydrograph type = SCS Runoff Peak discharge 73.13 cfs
Storm frequency = 50 yrs Time interval = 1 min
Drainage area = 7.200 ac Curve number. = 88
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time of conc. (Tc) = 1.80 min
Total precip. = 7.21 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 142,057 cult
New Post-Development
Q (cfs) Hyd. No. 2 -- 50 Yr Q (cfs)
80.00 80.00
70.00 70.00
60.00 60.00
50.00 50.00
40.00 40.00
30.00 30.00
20.00 20.00
10.00 10.00
0.00 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Time (hrs)
Hyd No. 2

TR55 Tc Worksheet
36
Hydraflow Hydrographs by Intelisolve
Hyd. No. 2
New Post-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 0.0 0.0 0.0
Two-year 24-hr precip. (in) = 0.00 0.00 0.00
Land slope (%) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Shallow Concentrated Flow
Flow length (ft) = 260.00 0.00 0.00
Watercourse slope (%) = 8.80 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 6.03 0.00 0.00
Travel Time (min) = 0.72 + 0.00 + 0.00 = 0.72
Channel Flow
X sectional flow area (sgft) = 1.77 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 3.50 0.00 0.00
Manning's n-value = 0.015 0.015 0.015
Velocity (ft/s) = 9.65 0.00 0.00
Flow length (ft) = 647.0 0.0 0.0
Travel Time (min) = 1.12 + 0.00 + 0.00 = 1.12
Total Travel Time, Tc .............................................................................. 1.80 min

Hydrograph Plot
37
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 3
Existing Pre-Development
Hydrograph type = SCS Runoff Peak discharge = 148.40 cfs
Storm frequency = 50 yrs Time interval = 2 min
Drainage area = 17.290 ac Curve number = 84
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = TR55 Time. of conc. (Tc) = 6.30 min
Total precip. = 7.21 in Distribution =Type II
Storm duration = 24 hrs Shape factor = 484
Hydrograph Volume = 314,188 cult
Q (cfs)
160.00
Existing Pre-Development
Hyd. No. 3 -- 50 Yr
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0 00
Q (cfs)
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0 00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Hyd No. 3 Time (hrs)

TR55 Tc Worksheet
38
Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Existing Pre-Development
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 115.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 24.00 0.00 0.00
Travel Time (min) = 3.82 + 0.00 + 0.00 = 3.82
Shallow Concentrated Flow
Flow length (ft) = 0.00 0.00 0.00
Watercourse slope (%) = 0.00 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + .0.00 = 0.00
Channel Flow
X sectional flow area (sgft) = 1.76 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 1.90 0.00 0.00
Manning's n-value = 0.013 0.015 0.015
Velocity (ft/s) = 8.17 0.00 0.00
Flow length (ft) = 1238.0 0.0 0.0
Travel Time (min) = 2.53 + 0.00 + 0.00 = 2.53
Total Travel Time, Tc .............................................................................. 6.30 min

Hydrograph Plot
39
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
Existing Post-Dee lopment
Hydrograph type = SCS Runoff
Storm frequency = 50 yrs
Drainage area = 19.010 ac
Basin Slope = 0.0
Tc method = TR55
Total precip. = 7.21 in
Storm duration = 24 hrs
Tuesday, Jan 30 2007, 2:21 PM
Peak discharge = 168.08 cfs
Time interval = 2 min
Curve number = 86
Hydraulic length = 0 ft
Time of conc. (Tc) = 6.30 min
Distribution =Type II
Shape factor = 484
Hydrograph Volume = 360,202 tuft
Q (cfs)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0 00
Existing Post-Deelopment
Hyd. No. 4 -- 50 Yr Q (cfs)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0 00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Hyd No. 4 Time (hrs)

TR55 Tc Worksheet
40
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
Existing Post-Deelopment
Description A B C Totals
Sheet Flow
Manning's n-value = 0.150 0.011 0.011
Flow length (ft) = 115.0 0.0 0.0
Two-year 24-hr precip. (in) = 3.60 0.00 0.00
Land slope (%) = 24.00 0.00 0,.00
Travel Time (min) = 3.82 + 0.00 + 0.00 = 3.82
Shallow Concentrated Flow
Flow length (ft) = 0.00 0.00 0.00
Watercourse slope (%) = 0.00 0.00 0.00
Surface description =Paved Paved Paved
Average velocity (ft/s) = 0.00 0.00 0.00
Travel Time (min) = 0.00 + 0.00 + 0.00 = 0.00
Channel Flow
X sectional flow area (sgft) = 1.76 0.00 0.00
Wetted perimeter (ft) = 4.71 0.00 0.00
Channel slope (%) = 1.90 0.00 0.00
Manning's n-value = 0.013 0.015 0.015
Velocity (ft/s) = 8.17 0.00 0.00
Flow length (ft) = 1238.0 0.0 0.0
Travel Time (min) = 2.53 + 0.00 + 0.00 = 2.53
Total Travel Time, Tc .............................................................................. 6.30 min

41
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 5
Existing Pond -Pre
Hydrograph type =Reservoir Peak discharge = 51.24 cfs
Storm frequency = 50 yrs Time interval = 2 min
Inflow hyd. No. = 3 Max. Elevation = 413.54 ft
Reservoir name =Existing Pond Max. Storage = 342,010 cult
Storage Indication method used. Wet pond routing start elevation = 410.00 ft. Hydrograph Volume = 267,928 tuft
Q (cfs)
160.00
140.00
120.00
100.00
80.00
60.00
40.00
Existing Pond -Pre
Hyd. No. 5 -- 50 Yr Q (cfs)
20.00
0.00 '
0 2 5
Hyd No. 5
7 9
Hyd No. 3
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0.00
12 14 16 19 21 23 26
Time (hrs)

Pond Report a2
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 1 -Existing Pond
Pond Data
Pond storage is based on known contour a reas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (tuft) Total storage (cult)
0.00 403.00 14,618 0 0
1.00 404.00 18,783 16,701 16,701
3.00 406.00 23,454 42,237 58,938
5.00 408.00 28,632 52,086 111,024
7.00 410.00 40,731 69,363 180,387
9.00 412.00 46,066 86,797 267,184
11.00 414.00 51,352 97,418 364,602
Culvert /Orifice Structures Weir Structures
IAI IBl [Cl IDl IAl IBl [C] IDl
Rise (in) = 36.00 3.00 0.00 0.00 Crest Len (ft) = 24.00 0.00 0.00 0.00
Span (in) = 36.00 3.00 0.00 0.00 Crest EI. (ft) = 412.80 0.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Cceff. = 3.33 3.33 0.00 3.33
Invert EI. (ft) = 403.60 410.00 0.00 0.00 Weir Type =Riser - - -
Length (ft) = 90.00 6.00 0.00 0.00 Multi-Stage =Yes No No No
Slope (%) = 0.60 1.00 0.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a No No No Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: Culvert/Or~ce outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions
Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
Stage /Discharge
Stage (ft)
12.00
10.00
8.00
6.00
4.00
z.oo
0 00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Total Q Discharge (cfs)

Hydrograph Plot
43
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 6
Existing Pond -Post
Hydrograph type =Reservoir Peak discharge = 82.52 cfs
Storm frequency = 50 yrs Time interval = 2 min
Inflow hyd. No. = 4 Max. Elevation = 413.83 ft
Reservoir name =Existing Pond Max. Storage = 356,089 cult
Storage Indication method used. Wet pond routing start elevation = 410.00 ft. Hydrograph Volume = 313,910 cult
Q (cfs)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0 00
Existing Pond -Post
Hyd. No. 6 -- 50 Yr
0 2 5 7 9 12 14 16 19 21 23
Hyd No. 6 Hyd No. 4
Q (cfs)
180.00
160.00
140.00
120.00
100.00
80.00
60.00
40.00
20.00
0.00
26
Time (hrs)

Pond Report 4a
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 1 -Existing Pond
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) .Total storage (cult)
0.00 403.00 14,618 0 0
1.00 404.00 18,783 16,701 16,701
3.00 406.00 23,454 42,237 58,938
5.00 408.00 28,632 52,086 111,024
7.00 410.00 40,731 69,363 180,387
9.00 412.00 46,066 86,797 267,184
11.00 414.00 51,352 97,418 364,602
Culvert /Orifice Structures Weir Structures
I1°-l IBl [Cl IDl I1°-l IBI [C] IDl
Rise (in) = 36.00 3.00 0.00 0.00 Crest Len (ft) = 24.00 0.00 0.00 0.00
Span (in) = 36.00 3.00 0.00 0.00 Crest EI. (ft) = 412.80 0.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Cceff. = 3.33 3.33 0.00 3.33
Invert EI. (ft) = 403.60 410.00 0.00 0.00 Weir Type =Riser - - ---
Length (ft) = 90.00 6.00 0.00 0.00 Multi-Stage =Yes- No No No
Slope (%) = 0.60 1.00 0.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multi-Stage = n/a No No No Exfiltration = 0.000 inlhr (Contour) Tailwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions.
Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
Stage I Discharge
Stage (ft)
12.00
10.00
8.00
6.00
4.00
2.00
0 00
0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00 100.00
Total Q Discharge (cfs)

Hydrograph Plot
45
Hydraflow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Hyd. No. 7
New Pond -Post
Hydrograph type =Reservoir Peak discharge = 49.28 cfs
Storm frequency = 50 yrs Time interval = 1 min
Inflow hyd. No. = 2 Max. Elevation = 386.12 ft
Reservoir name =New Pond Max. Storage = 88,465 cult
Storage Indication method used. Wet pond routing start elevation = 382.00 ft.
Q (cfs)
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0 00
New Pond -Post
Hyd. No. 7 -- 50 Yr
Hydrograph Volume = 131,838 cult
0
2 5
Hyd No. 7
7 9
Hyd No. 2
Q (cfs)
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
" 0.00
12 14 16 19 21 23 26
Time (hrs)

Pond Report 4s
Hydraftow Hydrographs by Intelisolve Tuesday, Jan 30 2007, 2:21 PM
Pond No. 2 -New Pond
Pond Data
Pond storage is based on known contour a reas. Average end area method used.
Stage /Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
0.00 379.00 7,700 0 0
1.00 380.00 8,906 8,303 8,303
3.00 382.00 11,487 20,393 28,696
5.00 384.00 14,294 25,781 54,477
7.00 386.00 17,328 31,622 86,099
7.50 386.50 21,000 9,582 95,681
Culvert /Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise (in) = 30.00 2.00 6.00 0.00 Crest Len (ft) = 24.00 0.00 0.00 0.00
Span (in) = 30.00 2.00 8.00 0.00 Crest EI. (ft) = 385.50 0.00 0.00 0.00
No. Barrels = 1 1 4 0 Weir Cceff. = 3.33 3.33 0.00 0.00
Invert EI. (ft) = 379.00 382.00 383.50 0.00 Weir Type =Riser -- -
Length (ft) = 132.00 1.00 1.00 0.00 Multistage =Yes No No No
Slope (%) = 0.22 1.00 1.00 0.00
N-Value = .013 .013 .013 .000
Orif. Coeff. = 0.60 0.60 0.60 0.00
Multistage = n/a Yes Yes No Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: CuIveNOr~ce outflows have been analyzed under inlet and outlet control. Weir riser checked for orifice conditions
Stage (ft)
8.00
6.00
4.00
2.00
0.00
0.00
Stage /Discharge
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90
Total Q
Stage (ft)
1.00 V VV
Discharge (cfs)

WETLAND OPERATION AND MAINTENANCE AGREEMENT
The wetland is defined as the wetland, pretreatment including forebays and the vegetated filter if one is
provided.
Maintenance activities shah be pertormed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland for sediment accumulation, erosron, trash accumulation, vegetated cover, and
general condition.
b. Check and clear the or~ce of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the copection system (i.e. catch basins, piping, swales, riprap, etc.} quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland semi-annually or when depth is reduced to 7596 of the
original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate
manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near
a wetland or stream, etc.}.
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readity penetrate into accumulated sediments.
When the permanent pool depth reads 2.25 feet in the main pond, the sediment shall be removed.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be removed
to design levels. This shall be performed by removing the upper t3 inches of soil and stockpiling it. Then
the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled soil
should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks.
When the permanent pod depth reads 2.25 feet in the forebay and micro-pool, the sediment shall be
removed.
BASIN DIAGRAM
(frll rn the blanks)
Permanent Pod Elevation 382.00
Sediment moval EI_379_7 7
Sediment Removal Elevation 379.75 7596
--------------------•------------- 3 ----------- ------
Bottom E vation 379.00 596
FOREBAY MAIN POND
5. Remove cattails and other indigenous wetland plants when they cover 5096 of the basin surface. These
plants shall be encouraged to grow abng the vegetated shelf and forebay berm.
Page 1 or 2

Weiland planting densities in the marsh areas should be maintained by replanting bare areas as needed.
Wetland plants should be encouraged to grow in the marsh areas.
6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. AIt components of the wetland shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shad be
maintained across the entire flow spreading structure. Any down gradient erosion mus# be repaired andlor
replanted as necessary.
i acknowledge and agree by my signature bek~r that I am responsible for the performance of the seven
maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Note: The legally responsible party should not be a homeowners association unless more than 50% of the
lots have been sold a d a resident of the subdivisan has been named the president.
I, ~` , a Notary Pubrliyc~ for the State of ,~~'"~'~ C~-d~ "~~
County of l~/q'1~ , do her y certify th t I~ 1 ~C~'i ~ ~ t/ • .~ ~ ^~'e s
personally appeared before me this ~~ day of , 200?, and acknowledge the due
execution of the forgoing wet (wetland] detention basi maintenanc equirements. Witness my hand and
offiaal seal,
~~'c. h'~~~,C~~} \
O~ ?~'Iky j, ~'
„a«
~ Au~t~U a
SEAL ~ f'S/fl
My commission expires /
Page 2 of 2
Print name: M tG u ~cL L- ~ o~! t~S
Title: ~1Q.~GtaR~ ~IK.t3t~A'ia¢Y ~kol4rfY AIGVtr.o~`"rtMC
Address: Wi~c~ts~. 3od~ r~ew la.~ttR.~1 /~wt~~ 'Rl~ttgH, tSG Z"I'Gto