20110446 Ver 1_More Info Received_20110623

¦WSPmSELLS
Transportation & Infrastructure
June 23, 2011
NCDENR
Division of Water Quality
512 N. Salisbury St., 9 h Floor
Raleigh, North Carolina 27604
919-807-6301
Attention: Ms. Karen Higgins
Reference: DWQ #11-0446
Storm Water Management Plan
Cottonwood Village
Lincoln County, NC
Dear Ms. Higgins:
NORTH CAROLINA 128 Overhill Drive
CONNECTICUT Suite 105
MASSACHUSETTS Mooresville, NC 281 17
NEW HAMPSHIRE Tel: [phone]
NEW JERSEY Fax: [phone]
NEW YORK www.wspsells.com
PENNSYLVANIA
SOUTH CAROLINA
VIRGINIA

JuN 2 3 2011
On behalf of Shoreline Property Management, Inc., please find attached two copies of the revised
Storm Water Management Plan, two copies of the revised calculations (soils map and USGS map.
We revised the plans per the comments dated May 24, 2011.
If you have any questions or require additional information, please contact us.
Respectfully submitted,
WSP SELLS
e?/- -C-4 C-t'
Jonathan A. Carter, P.E.
Project Manager

cc: Mr. Erich Hahne, Shoreline Property Management, Inc.
STORM WATER MANAGEMENT
CALCULATIONS
FOR
COTTONWOOD VILLAGE
PHASE 1
LINCOLN COUNTY, NORTH CAROLINA
Revised June 23, 2011
PREPARED BY:
jmEmWSP• SELLS
F-0891
128 Overhill Drive, Suite 105
Mooresville, NC 28117
Phone: [phone]
Fax: [phone]
;?4
3091fi
s -
STORM WATER MANAGEMENT
CALCULATIONS
FOR
COTTONWOOD VILLAGE
PHASE 1
LINCOLN COUNTY, NORTH CAROLINA
Revised June 23, 2011
PREPARED BY:
p/mmmWSP•SELLS
F-0891
128 Overhill Drive, Suite 105
Mooresville, NC 28117
Phone: [phone]
Fax: [phone]
L JUN `l, ; ZU11
DENR . ttATE
R6U
(wnw,.?.. ?._
N GAR,
30916
? r tiNS?rs s?
N,A?.?,,.

PROJECT NARRATIVE
The Cottonwood Village Phase 1 project in Lincoln County, NC will consist of the extension of an
existing road to serve the multiple lots proposed for the development. Phase 1 construction will
consist of a stream crossing and approximately 2.28 acres of disturbance.
A 404 permit (US Army Corp. of Engineers) has been approved (2010-01950, Nationwide permit
39, December 8, 2010).
The enclosed storm water management plan includes the entire Cottonwood Village development
and shows the construction of Pond 1, which will be constructed prior to the entire site reaching 24%
imperviousness. Pond I takes into account Phase 1, Phase 2, and pant of Phase 3 (apartments that
will drain to Pond 1 in the future) of Cottonwood Village. The storm water management plan also
shows the location of Pond 2 which will need to be constructed with Phase 3 and Phase 4 of the
project.
The proposed BMP(s) are denoted as Pond 1 and Pond 2. The BMP(s) are designed in accordance
with the North Carolina BMP Manual (2007 edition). Pond 1 is designed for 90% TSS removal with
a permanent pool minimum average depth of 3.5 feet. Pond 2 will need to be designed with Phase 3
and Phase 4 of the project.
The hydrologic calculations include pre and post discharge rates for the 1-yr, 10-yr, 25-yr, 50-yr, and
100-yr 24 hour events. These calculations are based upon SCS TR20 method using HydroCAD
computer modeling. The water quality drawdown is based upon the 1-inch storm event per the BMP
guidelines.
As shown in the calculations, the post development discharge rates are below predevelopment
discharge rates for the 1-yr and 10-yr storm event. The emergency spillway is sized for the 100-yr
storm event.
The BMP(s) will be constructed after the site construction is completed and the site is stabilized in
accordance with the erosion and sediment control plan. Following construction of the BMP(s) and
establishment of vegetation, the BMP(s) will be maintained in accordance with the Operations and
Maintenance Agreements included in this Plan.
0
•

NCDENR FORMS
•
Permit No.
(to bepmvdedbyDINO)
AWA
NCDENR
Project name
Contact person
Phone number
Date
Drainage area number
701662.0100
61 ODI
11. ?DESIGN INFORMATION
Site Characteristics
Drainage area 710,323 ft'
Impervious area, post-development 409,316 fe
% Impervious 57.62%
Design rainfall depth 1.0 in
Storage Volume: Non-SA Waters
Minimum volume required 33,865 fO OK
Volume provided 39,665 fe
OK, volume provided Is equal to or in excess of volume required.
Storage Volume: SA Waters
1.5' runoff volume fe
Pre-development 1-yr, 24-hr runoff to
Post-development 1-yr, 24-hr runoff I?
Minimum volume required to
Volume provided to
Peak Flow Calculations
Is the pre/post control of the lyr 24hr storm peak flow required?
1-yr, 24-hr rainfall depth
Rational C, pre-development
Rational C, post-development
Rainfall intensity:)-yr, 24-hr stomp
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr. 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pod elevation)
Top of I Oft vegetated shelf elevation
Bottom of 101t vegetated shelf elevation
Sediment deanout, top elevation (bottom of pond)
Sediment deanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state-required temp. pod?
Elevation of the top of the additional volume
1?
?o?pF W ATF9QG
•y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM Y
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submfited
The Required Items Checkilst (Parf Ill) must be printed, filled out end submitted along w1h all of the requred information.
Y (Y or N)
3.0 In
0.40 (untUess)
0.60 (uni less)
4.67 lift OK
3.35 ft'/sec
2.19 felsec
-1.16 elsec
712.00 fmsl
710.50 fmsl
705.00 fmsl
711.001ms1
710.00 tmsi Data not needed for calculation option #1, but OK if provided.
705.001msl
704.001msl Data not needed for calculation option #i, but OK If provided.
1.00 It
y (Y or N)
712.0 fmsl OK
Form SW401-Wet Detention 8as4n-Rev.8.9117109 Parts I. a II. Design Summery. Page 1 of 2
Permit No.
(to be provided by DM)
II. DESIGN INFORMATION
. Surface Areas
Area, temporary pad 28,665 f?
Area REQUIRED, permanent pool 22,162 fl
SAIDA ratio 3.12 (unitless)
Area PROVIDED, permanent per. Ar.,„,,w 22,918 a OK
Area, bottom of 10ft vegetated shelf, AwLo.,F 19,867 fe
Area, sediment deanout, top elevation (bottom of pond), Aw,,d 8,391 ft`
Volumes
Volume, temporary pod 39,665 fO OK
Volume permanent pool, V"-,, 83,8117 f?
Volume, forebay (sum of forebays if more than one forebay) 16,159 le
Forebay % of permanent pod volume 19.34A'% OK
SAIDA Table Data
Design TSS removal 90%
Coastal SAIDA Table Used? n (Y or N)
MountaWledmait SAIDA Table Used? y (Y or N)
SAIDA ratio 3.12 (unittess)
Average depth (used In $AIDA table):
Calculation option 1 used? (See Figure 10-2b) y (Y or N)
Volume, permanent pod, V,,,,,,w 83,667 le
Area provided, permanent pool, A,,,,,,,,, 22,918 fV
Average depth calculated 3.56 It OK
Average depth used in SAW, d,,, (Round to nearest 0.5ft) 3.5 ft OK
Calculation option 2 used? (See Figure 10.2b) in (Y or N)
Area provided, permanent pod, A,,,,,1,,, 22,918 fe
Area, bottom of 1011 vegetated shelf At,, ,4y 19,867 ftz
Area, sediment cieanout, top elevation (bottom of pond), At,,,w 8,391 fe
'Depth' (distance b/w bottom of 1 Oft shelf and top of sediment) 5.00 ft
Average depth calculated it
Average depth used in SAW, d,„ (Round to nearest 0.5ft) ft
Drawdown Calculations
Drawdown through orifice?
Diameter of orifice (if circular)
Area of orifice (it-non-circular?
Coefficient of discharge (CD)
Driving head (H,)
Drawdown through weir?
Weir type
Coefficient of discharge (C,)
Length of weir (L)
Driving head (H)
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Storage volume discharge rate (through discharge orifice or weir)
Storage volume drawdown time
Additional Information
Vegetated side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build-art?
Drain mechanism for maintenance or emergencies Is:
y (Y or N)
3.00 in
in'
0.60 (unitless)
0.48 it
n (Y or N)
(uniUess)
(unkless)
it
it
3.35 fe/sec
2.19 ft'/sec
0.30 fe/sec
2.77 days
OK, draws down In 2-5 days.
3 :1 OK
10 :1 OK
10.0 it OK
4 :1 OK
2.5 :1 OK
y (Y or N) OK
IT it OK
y (Y or N) OK
y (Y or N) OK
y (Y or N) OK
Concrete Spillway
Form SW401-Wat Detention Basin•Rev.8-9/17!09 Pads 1. & 11, Design Summary. Pape 2 or 2
C?
RAINFALL DATA
•
0
•
Precipitation Frequency Data Server

Paget of 4
POINT PRECIPITATION'',
FREQUENCY ESTIMATES
FROM NOAA ATLAS 14 ';Nt
LINCOLNTON 4 W, NORTH CAROLINA (31-4996) 35.4667 N 81.3333 W 898 feet
from "Precipitation-Frequency Atlas of the United States" NOAA Atlas 14, Volume 2, Version 3
O.M. Bonnin, D. Martin, B. Lin, T. Pam)", hf.Yekta, and D. Riley
NOAH, National Weather Service, Silver Spring, Maryland, 2004
. Extracted: Mon Ike 13 2010
U
•
on ldence Limits Seasonality 11 Related Info 11 GIS data Maps Docs Return to State Map
Precipitation Frequency Estimates (inches) I
11k F 6-0 ]
(yars?W11?? , 21 RRot]Rki?I?.
R rP E?FdaslyFda -j 1
F653-91P-6-21F-78-V-061 1.33 1.34 1.65 2.0-31F24-751F 98 3.54 3.97 4.59 3.24 7.01 8.59 10.84 12.92
0 0.46 0.73 0.92 1.28 1.60 1.87 2.00 2.44 2.98 3.60 4.26 4.77 5.49 6.24 8.28 10.11 12.69 15.07
0 0.54 0.87 1.10 1.56 2.00 2.35 2.51 3.06 3.73 4.54 5.33 5.89 6.68 7.50 9.78 11.73 14.45 16.99
10 0.60 0.96 1.22 1.77 2.30 2.72 2.93 3.56 4.34 5.27 6.17 6.78 7.-63--IF
48 10.95 12.97 15.79 18.46
25 0.68 1.08 1.37 2.03 2.70 3.24 3.51 4.27 5.19 6.29 7.32 7.99 8.92 9.79 12.51 14.59 17.52 20.35
SO 0.73 F,-1-71F,4--8V2-23T302 365 3.99 4.86 5.89 .7.09 8.23 8.94 9.94 10.81 13.73 15.83 18.83 21.77
F100 0.79 1.25 1.58 2.42 3.34 4.08 4.49 5.48 6.63 7.92 9.15 9.93 10.97 11.84 14.96 17.04 20.10 23.14
200 0.84 1.33 1.68 2.61 3.67 4.52 5.03 6.14 7.41 8.79 10.12 10.93 12.04 12.89 16.20 18.26 21.34 24.47
500 0.90 1.43 1.80 2.87 4.11 5.14 5.80 7.09 8.52 9.97 11.44 12.31 13.49 14.30 17.89 19.87 22.9b 26.19
1000 0.95 1,50 1.89 3.06 4.46 5.64 6.44 ?.88 9.43 10.92 12.49 13.40 14.64 15.40 19.20 21.09 24.18 27.48
' These predpitatlon hegmq estimates are based on a odat duration series. ARI Is the Averape Recurrence Interval.
Please refer to NOM Atlas 114 Dowment for more Information. NOTE: Formstfm forces estimates near zero to swam as zero.
L * Upper bound of the 90%o confidence interval
Precipitation Fre uenc Estimates inches
ARI** 5 10 15 30 60 120 3 6 12 24 Ph8r Fdr, 7 10 20 30 45 60 11 I --1F
ears rnin min min min 11 min min hr hr hr da da da da da 11 da
C? 0.42 0.68 0.84 1.16 1.45 1.69 1.82 2.22 2.69 3.20 3.81 4.25 4.89 5.56 7.38 9.01 11.36 13.47
-5-5- 1 0.80 1.01 1.40 1.75 2.05 2.20 .2.68 3.25 3.87 F-5-9- 1 5.11 5.84 6.62 8.72 10.60 13.28 15.71
F -5- 0.59 0.95 1.20 1.70 2.18 F2-57F2-76F3 35 4.07 4.87 5.74 6.30 7.11 7.95 10.30 12,28 15.11 17.68
F-16-T-6-6-1 F10-5-T-3-31 1.93 2.51 -98- 1 3.21 3.89 F_73- 1 5.65 6.63 7.25 8.12 8.99 11.54 13.58 16.52 19.22
F-25--]FO-74-1 1.18 1.49 2.21 2.9-4 3.54 F3-851F 66 5.65 6.74 7.86 8.54 9.48 10.38 13.20 15.28 18.32 21.19
50 0.80 1.27 1.61 2.43 3.29 3.99 4.39 5.31 6.41 7.60 8.84 9.57 10.57 11.47 14.49 16.59 19.70 22.67
100 0.86 1.37 1.73 2.65 3.65 4.47 4.95 6.00 7.21 8.49 9.84 10.63 11.68 12.58F---117 87
21.03 24.12
1580
526-6-T-9-21 1.46 1.84 2.86 4.02 4.97 5.56 6.74 8.07 9.41 10.88 11.71 12.83 13.70 17.14 19.17 22.36 25.53
500 1.00 111.57 1.98 3.15 4.53 5.69 6.45 7.82 9.30 10.71 12.32 13.21 14,39 15.21 18.95 20,89 24.08 27.37
1000 1.06 1.66 2.09 3,38 4.94 6.27 7.19 8.72 10.33 .11.73 13.45 14.39 15.64 16.41 20.38 22.22 25.39 28.76
' The uaner bound or the weirdeneA inlpntat At gnat enn&tpm uw.i It th...fi..00A ML nr tt...Lpid.t. t .., t:....n... r ...>w.. u....__....- _......,t._
These pred0tathn frequency estimates are based on a POW duration series. ARI Is the Average Recurrence interval.
Please refer to NOAA Atlas U Document for mere Inrnrmaunn- NnTP Fnrmatrm n mte peHmalaa near sere In .nn..,.a sera
* Lower bound of the 90% confidence interval
Precipitation Frequency Estimates inches
ARI** S 10 1S 30 60 120 3 6 11 12 24 48 4 7 10 20 30 45 60
ears min min min min mhf niln Ilr hr hr 11 hr 11 hr da da da day da day 11
da
?-2- i J- 0.36 0,57 0.71 0.98 1.22 1.41 1.51 1.87 2.28 2.78 3,29 3.70 4.31 4.95 6.64 8.20 10.39 12.41
L 0.42 0.68 5- 1 1,17 1.47 1.71 1.83 2.25 2.75 3.36 3.97 4.45 5.14 5.89 7.85 9.65 12.14 14.47
®0.50 0.79 1.(10 1.43 1.83 2.15 2.29 2.81 3.43 4.23 4.97 5.48 6.26 7.07 9.26 11.19 13.83 16.30
10 F55-5-No .88 1.11 1.61 2.10 2.48 2.66 3.26 3.97 4.91 5.73 6.30 7.14 7.99 10.36 12.37 15.11 17.71
2S 0.61 0.98 1.24 1.84 2.45 2.94 3.17 3.87 4.72 5.83 6.78 7.40 8.32 9.20 11.81 13.89 1652 19.52
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0 POND CALCULTIONS

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WET POND 1
COTTONWOOD VILLAGE - PHASE 1
DATE: June 6, 2011
PRE
area 14.2 ac.
CN 60
tc 15.1 min.
RUNOFF
CFS VOLUME
AC-FT
1-Y 3.35 0.324
10-Y 24.72 1.541
25-Y 37.06 2.251
50-Y 47.47 2.857
100-Y 58.78 3.522
POST
area 16.30 ac.
CN 82
tc 5.0 min.

RUNOFF
CFS
RUNOFF
VOLUME
AC-FT

OUTFLOW
CFS
OUTFLOW
VOLUME
AC-FT

STORAGE
AC-FT MAXIMUM
WATER
ELEVATION
FT
1-Y 40.05 1.698 2.19 0.754 3.104 712.17
10-Y 95.38 4.199 24.27 3.222 4.126 713.59
25-Y 120.72 5.396 52.72 4.405 4.545 714.13
50-Y 140.64 6.354 67.28 5.352 4.818 714.46
100-Y 161.29 7.359 68.46 6.347 51.490 714.86
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NCDENR Stormwater BMP Manual Chapter Revised 06-16-09
Table 10-3
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 90 Percent TSS
Pollutant Removal Efficiency in the Mountain and Piedmont Regions, Adapted from Driscoll, 1986
Percent
Impervious
Cover

3.0

3.5

4.0 Permanent Pool Average Depth (ft)

4.5 5.0 5.5 6.0 6.5 7.0

7.5

8.0

8.5

9.0
10% 0.9 0.8 0.8 0.7 0.6 0.6 0.5 0.5 0.5 0.5 0.4 0.4 0.4
20% 1.5 1.3 1.1 1.0 1.0 0.9 0.9 0.9 0.8 0.8 0.8 0.7 0.7
30% 1.9 1.8 1.7 1.5 1.4 1.4 1.3 1.1 1.0 1.0 1.0 0.9 0.9
40% 2.5 2.3 2.0 1.9 1.8 1.7 1.6 1.6 1.5 1.4 1.3 1.2 1.1
50% 3.0 2.8 2.5 2.3 2.0 1.9 1.9 1.8 1.7 1.6 1.6 1.5 1.5
60% 3.5 3.2 2.8 2.7 2.5 2.4 2.2 2.1 1.9 1.9 1.8 1.8 1.7
70% 4.0 3.7 3.3 3.1 2.8 2.7 2.5 2.4 2.2 2.1 2.0 2.0 1.9
80% 4.5 4.1 3.8 3.5 3.3 3.0 2.8 2.7 2.6 2.4 2.3 2.1 2.0
90% 5.0 4.5 4.0 3.8 3.5 3.3 3.0 2.9 2.8 2.7 2.6 2.5 2.4
Table 10-4
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 90 Percent TSS
Pollutant Removal Efficiency in the Coastal Region, Adapted from Driscoll, 1986
•
Percent
Impervious
Cover

3.0

3.5

4.0 Permanent Pool Average Depth (ft)

4.5 5.0 5.5 6.0

6.5

7.0

7.5'
10% 1.3 1.0 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
20% 2.4 2.0 1.8 1.7 1.5 1.4 1.2 1.0 0.9 0.6
30% 3.5 3.0 2.7 2.5 2.2 1.9 1.6 1.3 1.1 0.8
40% 4.5 4.0 3.5 3.1 2.8 2.5 2.1 1.8 1.4 1.1
50% 5.6 5.0 4.3 3.9 3.5 3.1 2.7 2.3 1.9 1.5
60% 7.0 6.0 5.3 4.8 4.3 3.9 3.4 2.9 2.4 1.9
70% 8.1 7.0 6.0 5.5 5.0 4.5 3.9 3.4 2.9 2.3
80% 9.4 8.0 7.0 6.4 5.7 5.2 4.6 4.0 3.4 2.8
90% 10.7 9.0 7.9 7.2 6.5 5.9 5.2 4.6 3.9 3.3
100% 12 10.0 8.8 8.1 7.3 6.6 5.8 5.1 4.3 3.6
The engineering design of a wet detention basin must include a 10-foot-wide (minimum)
vegetated shelf around the full perimeter of the basin. The inside edge of the shelf shall
be no deeper than 6" below the permanent pool level, and the outside edge shall be 6"
above the permanent pool level. For a 10' wide shelf, the resulting slope is 10:1. With
half the required shelf below the water (maximum depth of 6 inches), and half the
required shelf above the water, the vegetated shelf will provide a location for a diverse
population of emergent wetland vegetation that enhances biological pollutant removal,
provides a habitat for wildlife, protects the shoreline from erosion, and improves
sediment hap efficiency. A 10' wide shelf also provides a safety feature prior to the
deeper permanent pool.
Short-circuiting of the stormwater must be prevented. The most direct way of
minimizing short-circuiting is to maximize the length of the flow path between the inlet
and the outlet: basins with long and narrow shapes can maximize the length of the flow
path. Long and narrow but irregularly shaped wet detention basins may appear more
15 Wet Detention Basin 10-15 July 2007
Appendices
•
3o
Outlet 17 W 3 Do + La
plpe
diameter (Do)
La -----+I
i' water < 0.5Do
o?
ng?r of Pic 60
-loin,
4

20 ?... ,.< ..'' .50fs 100
Discharge (ft /sec)
3.
v
2 W
Q
L
Q
O
it O
D
1000
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection 0otect/ion from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
to
Rev, I W3
16 8.06.3
•
•
•
DA? 1
Subcat Reach on Link Drainage Diagram for Cottonwood-POND 1-PRE
Prepared by WSP SELLS, Printed 6/23/21)11
HydroCADS 9.00 On 04719 ® 2009 HydroCAD Software Solutions LLC
17
Cottonwood-POND 1 -PRE
. Prepared by WSP SELLS Printed 6123/2011
HydroCAD® 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Pane 2
Area Listing (all nodes)
Area CN Description
(acres) (subcatchment-numbers)
14.200 60 Woods, Fair, HSG B (1S)
14.200 TOTAL AREA
•
•
18
Cottonwood-POND 1 -PRE
. Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 3
Soil Listing (ail nodes)
Area Soil Subcatchment
(acres) Gaup Numbers
0.000 HSG A
14.200 HSG B 1S
0.000 HSG C
0.000 HSG D
0.000 Other
14.200 TOTAL AREA
•
•
19
Cottonwood-POND 1 -PRE Type// 24-hr 1-year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
HydroCADS 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Paoe 4
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=14.200 ac 0.00% Impervious Runoff Depth>0.27"
Flow Length=917' Tc=15.1 min CN=60 Runoff=3.35 cfs 0.324 of
Total Runoff Area =14.200 ac Runoff Volume = 0.324 of Average Runoff Depth = 0.27"
100.00% Pervious= 14.200ac 0.00% Impervious = 0.000 ac
•
0
20
Cottonwood-POND 1 -PRE Type// 24-hr 1-year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 1S: DA -1
Runoff - 3.35 cfs @ 12.13 hrs, Volume= 0.324 af, Depth> 0.27"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-year Rainfall=2.98"
Area (ac) CN Description
14.200 60 Woods, Fair, HSG B
14.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
•
12.3 100 0.0700 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.60"
1.2 445 0.1400 6.02 Shallow Concentrated Flow, Shallow
Unpaved Kv=16.1 fps
1.6 372 0.1020 3.97 15.89 Channel Flow, Channel -1
Area= 4.0 sf Perim= 7.3' r= 0.55'
n= 0.080 Earth. Iona dense weeds
15.1 917 Total
Subcatchment 1S: DA -1
Hydragraph
? RunoN
Type 11.24-hr I -year

3 Rainfall=2.98"
Runoff Area=14.200 ac
Runoff Volume=0.324 of
2- Runoff Depth>0.27"
Flow Length=917'
_ Tc=15.1 min
1 CN=60
7 8 9 10 11 12 13 14 15
Time (hours)
11
21
Cottonwood-POND 1 -PRE Type // 24-hr 1 -year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Pace 6
Hydrograph for Subcatchment 1S: DA -1
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.19 0.00 0.00
5.25 0.20 0.00 0.00
5.50 0.21 0.00 0.00
5.75 0.23 0.00 0.00
6.00 0.24 0.00 0.00
6.25 0.25 0.00 0.00
6.50 0.27 0.00 0.00
6.75 0.28 0.00 0.00
7.00 0.30 0.00 0.00
7.25 0.31 0.00 0.00
7.50 0.33 0.00 0.00
7.75 0.34 0.00 0.00
8.00 0.36 0.00 0.00
8.25 0.37 0.00 0.00
8.50 0.39 0.00 0.00
8.75 0.42 0.00 0.00
9.00 0.44 0.00 0.00
9.25 0.46 0.00 0.00
9.50 0.49 0.00 0.00
9.75 0.51 0.00 0.00
10.00 0.54 0.00 0.00
10.25 0.57 0.00 0.00
10.50 0.61 0.00 0.00
10.75 0.65 0.00 0.00
11.00 0.70 0.00 0.00
11.25 0.76 0.00 0.00
11.50 0.84 0.00 0.00
11.75 1.15 0.00 0.00
12.00 1.98 0.06 1.31
12.25 2.10 0.08 2.27
12.50 2.19 0.10 1.24
12.75 2.25 0.11 0.85
13.00 2.30 0.12 0.71
13.25 2.34 0.13 0.62
13.50 2.38 0.14 0.56
13.75 2.41 0.15 0.51
14.00 2.44 0.16 0.46
14.25 2.47 0.17 0.42
14.50 2.50 0.17 0.41
14.75 2.52 0.18 0.39
15.00 2.54 0.19 0.38
15.25 2.57 0.19 0.36
15.50 2.59 0.20 0.35
15.75 2.60 0.20 0.33
16.00 2.62 0.21 0.31
16.25 2.64 0.21 0.29
16.50 2.66 0.22 0.29
16.75 2.67 0.22 0.28
17.00 2.69 0.23 0.28
17.25 2.70 0.23 0.27
17.50 2.72 0.24 0.26
17.75 2.73 0.24 0.26
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 2.74 0.25 0.25
18.25 2.76 0.25 0.24
18.50 2.77 0.25 0.24
18.75 2.78 0.26 0.23
19.00 2.79 0.26 0.22
19.25 2.81 0.27 0.22
19.50 2.82 0.27 0.21
19.75 2.83 0.27 0.20
20.00 2.84 0.28 0.19
22
•
Cottonwood-POND 1-PRE
Prepared by WSP SELLS
HvdroCAD® 9.00 s/n 04719 ® 2009
Type// 24-hr 10-year Rainfall=5.27'
Printed 6/23/2011
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=14.200 ac 0.00% Impervious Runoff Depth>1.30"
Flow Length=917' Tc=15.1 min CN=60 Runoff=24.72 cfs 1.541 of
Total Runoff Area =14.200 ac Runoff Volume =1.541 of Average Runoff Depth =1.30"
100.00% Pervious= 14.200ac 0.00% Impervious = 0.000 ac
•

23
Cottonwood-POND 1 -PRE Type 1124-hr 90 year Rainfall=5.27"
Prepared by WSP SELLS Printed 6/23/2011
• HydroCAD® 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Pace 8
Summary for Subcatchment 1S: DA -1
Runoff - 24.72 cfs ae 12.09 hrs, Volume= 1.541 af, Depth> 1.30"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10-year Rainfall=5.27"
Area (ac) CN Description
14.200 60 Woods, Fair, HSG B
14.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
12.3 100 0.0700 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.60"
1.2 445 0.1400 6.02 Shallow Concentrated Flow, Shallow
Unpaved Kv=16.1 fps
1.6 372 0.1020 3.97 15.89 Channel Flow, Channel -1
Area= 4.0 sf Perim= 7.3' r= 0.55'
n= 0.080 Earth, long dense weeds
15.1 917 Total
Subcatchment 1S: DA -1
Hydrograph
I ®RunoH
24 Type II 24-hr 10-year
22- Rainfall=6.27"
2 Runoff Area=.14.200 ac
Runoff Volume=UM of
16=
14 Runoff Depth>1.30"
M 12 Flow Length=917'
10 Tc=15.1 min
6 CN=60
o?
5 6 7 a 9 10 11 12 13 14
Time (hours)
•
24
Cottonwood-POND 1 -PRE Type 1124-hr 10 year Rainfal1=5.27'
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC _Paee_9
Hydrograph for Subcatchment 1S: DA -1
r-?
J
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (CIS)
5.00 0.33 0.00 0.00
5.25 0.35 0.00 0.00
5.50 0.38 0.00 0.00
5.75 0.40 0.00 0.00
6.00 0.42 0.00 0.00
6.25 0.45 0.00 0.00
6.50 0.47 0.00 0.00
6.75 0.50 0.00 0.00
7.00 0.52 0.00 0.00
7.25 0.55 0.00 0.00
7.50 0.58 0.00 0.00
7.75 0.60 0.00 0.00
8.00 0.63 0.00 0.00
8.25 0.66 0.00 0.00
8.50 0.70 0.00 0.00
8.75 0.73 0.00 0.00
9.00 0.77 0.00 0.00
9.25 0.82 0.00 0.00
9.50 0.86 0.00 0.00
9.75 0.90 0.00 0.00
10.00 0.95 0.00 0.00
10.25 1.01 0.00 0.00
10.50 1.08 0.00 0.00
10.75 1.15 0.00 0.00
11.00 1.24 0.00 0.00
11.25 1.35 0.00 0.00
11.50 1.49 0.00 0.09
11.75 2.04 0.07 1.38
12.00 3.49 0.53 18.16
12.25 3.72 0.63 12.73
12.50 3.87 0.70 5.39
12.75 3.98 0.75 3.34
13.00 4.07 0.80 2.71
13.25 4.14 0.83 2.30
13.50 4.21 0.87 2.04
13.75 4.27 0.90 1.81
14.00 4.32 0.92 1.63
14.25 4.37 0.95 1.48
14.50 4.41 0.97 1.40
14.75 4.46 1.00 1.34
15.00 4.50 1.02 1.28
15.25 4.54 1.04 1.22
15.50 4.57 1.06 1.15
15.75 4.61 1.08 1.09
16.00 4.64 1.10 1.02
16.25 4.67 1.11 0.96
16.50 4.70 1.13 0.94
16.75 4.72 1.14 0.91
17.00 4.75 1.16 0.89
17.25 4.78 1.17 0.87
17.50 4.80 1.19 0.85
17.75 4.83 1.20 0.82
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 4.85 1.22 0.80
18.25 4.88 1.23 0.77
18.50 4.90 1.24 0.75
18.75 4.92 1.26 0.73
19.00 4.94 1.27 0.70
19.25 4.96 1.28 0.68
19.50 4.98 1.29 0.65
19.75 5.00 1.30 0.62
20.00 5.02 1.31 0.60
25
Cottonwood-POND 1-PRE Type// 24-hr 25-year Rainfall=6.29"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Pane 10
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=14.200 ac 0.00% Impervious Runoff Depth>1.90"
Flow Length=917' Tc=15.1 min CN=60 Runoff=37.06 cfs 2.251 of
Total Runoff Area =14.200 ac Runoff Volume = 2.251 of Average Runoff Depth =1.90"
100.00% Pervious =14.200 ac 0.00% Impervious = 0.000 ac
L_J
0
26
Cottonwood-POND 1 -PRE Type// 24-hr 25-year Rainfall=6.29"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 11
Summary for Subcatchment 1S: DA -1
Runoff = 37.06 cfs @ 12.08 hrs, Volume= 2.251 af, Depth> 1.90"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 25-year Rainfall=6.29"
Area (ac) CN Description
14.200 60 Woods, Fair, HSG B
14.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.3 100 0.0700 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.60"
1.2 445 0.1400 6.02 Shallow Concentrated Flow, Shallow
Unpaved Kv=16.1 fps
1.6 372 0.1020 3.97 15.89 Channel Flow, Channel -1
Area= 4.0 sf Perim= 7.3' r= 0.55'
n= 0.080 Earth. Iona dense weeds
15.1 917 Total
Subcatchment IS: DA -1
Hydrograph
40
38 37.06 eh
38. Type 1124-hr 25-year
34-
32_ Rainfall=6.29"
28_ # Runoff Area=14.200 ac
28 Runoff Volume=2.251 of
,24
.. 22 Runoff Depth' 1.00"
20
1a. Flow Length=917'.
14: Tc=15.1 min
12= CN=60
10:
5
E
11 12 13 14
Time (hours)
® Runoff
27
Cottonwood-POND 1 -PRE Type// 24-hr 25 year Rainfall=6.29"
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 12
Hydrograph for Subcatchment 1S: DA -1
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.40 0.00 0.00
5.25 0.42 0.00 0.00
5.50 0.45 0.00 0.00
5.75 0.48 0.00 0.00
6.00 0.50 0.00 0.00
6.25 0.53 0.00 0.00
6.50 0.56 0.00 0.00
6.75 0.59 0.00 0.00
7.00 0.62 0.00 0.00
7.25 0.65 0.00 0.00
7.50 0.69 0.00 0.00
7.75 0.72 0.00 0.00
8.00 0.75 0.00 0.00
8.25 0.79 0.00 0.00
8.50 0.83 0.00 0.00
8.75 0.88 0.00 0.00
9.00 0.92 0.00 0.00
9.25 0.97 0.00 0.00
9.50 1.03 0.00 0.00
9.75 1.08 0.00 0.00
10.00 1.14 0.00 0.00
10.25 1.21 0.00 0.00
10.50 1.28 0.00 0.00
10.75 1.37 0.00 0.00
11.00 1.48 0.00 0.09
11.25 1.61 0.01 0.31
11.50 1.78 0.03 0.73
11.75 2.43 0.16 3.32
12.00 4.17 0.85 28.65
12.25 4.44 0.99 18.46
12.50 4.62 1.09 7.57
12.75 4.75 1.16 4.62
13.00 4.86 1.22 3.73
13.25 4.95 1.27 3.16
13.50 5.03 1.32 2.80
13.75 5.10 1.36 2.48
14.00 5.16 1.39 2.22
14.25 5.21 1.43 2.01
14.50 5.27 1.46 1.90
14.75 5.32 1.49 1.82
15.00 5.37 1.52 1.73
15.25 5.41 1.55 1.65
15.50 5.46 1.58 1.56
15.75 5.50 1.60 1.47
16.00 5.54 1.62 1.38
16.25 5.57 1.65 1.30
16.50 5.61 1.67 1.26
16.75 5.64 1.69 1.23
17.00 5.67 1.71 1.20
17.25 5.70 1.73 1.17
17.50 5.73 1.75 1.13
17.75 5.76 1.77 1.10
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 5.79 1.79 1.07
18.25 5.82 1.81 1.04
18.50 5.85 1.82 1.00
18.75 5.87 1.84 0.97
19.00 5.90 1.86 0.94
19.25 5.92 1.87 0.90
19.50 5.95 1.89 0.87
19.75 5.97 1.90 0.83
20.00 6.99 1.91 0.80
28
Cottonwood-POND 1 -PRE Type 1124-hr 50-year Rainfall=7.09"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 13
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=14.200 ac 0.00% Impervious Runoff Depth>2.41"
Flow Length=917' Tc=15.1 min CN=60 Runoff=47.47 cfs 2.857 of
Total Runoff Area =14.200 ac Runoff Volume = 2.857 of Average Runoff Depth = 2.41"
100.00% Pervious =14.200 ac 0.00% Impervious = 0.000 ac
•
0
29
Cottonwood-POND 1-PRE
Prepared by WSP SELLS
• HydroCAD® 9.00 s/n 04719 ® 20
Type ll 24-hr 50 year Rainfall=7.09"
Printed 6/23/2011
Software Solutions LLC
Summary for Subcatchment 1S: DA -1
Runoff = 47.47 cfs @ 12.08 hrs, Volume= 2.857 af, Depth> 2.41
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 50-year Rainfall=7.09"
Area (ac) CN Description
14.200 60 Woods, Fair, HSG B
14.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
12.3 100 0.0700 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.60"
1.2 445 0.1400 6.02 Shallow Concentrated Flow, Shallow
Unpaved Kv=16.1 fps
1.6 372 0.1020 3.97 15.89 Channel Flow, Channel -1
Area= 4.0 sf Perim= 7.3' r= 0.55'
n= 0.080 Earth. Iona dense weeds
15.1 917 Total
•
Subcatchment 1S: DA -1
Hydrograph
Q RunoN
40
1 30-
V
25
1
Type 1124-hr 50-year
- Rainfall=7.09"
Runoff Area=14:200 ac
Runoff Volume=2.857 of
Runoff Depth5-2.41"
Flow Length=917'
Tc=15.1 min
CN=60
Tf"r1TTrl"1-rT'?-TTrTTT-r'rl !?-rrrf rT? rT-! rrr-r-n-r?
8 9 10 11 12 13 14 15 16 t7 18 19 20
Time (hours)
•
30
Cottonwood-POND 1 -PRE Type// 24-hr 50-year Rainfall=7.09"
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 15
Hydrograph for Subcatchment 1S: DA -1
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.45 0.00 0.00
5.25 0.48 0.00 0.00
5.50 0.51 0.00 0.00
5.75 0.54 0.00 0.00
6.00 0.57 0.00 0.00
6.25 0.60 0.00 0.00
6.50 0.63 0.00 0.00
6.75 0.67 0.00 0.00
7.00 0.70 0.00 0.00
7.25 0.74 0.00 0.00
7.50 0.77 0.00 0.00
7.75 0.81 0.00 0.00
8.00 0.85 0.00 0.00
8.25 0.89 0.00 0.00
8.50 0.94 0.00 0.00
8.75 0.99 0.00 0.00
9.00 1.04 0.00 0.00
9.25 1.10 0.00 0.00
9.50 1.16 0.00 0.00
9.75 1.22 0.00 0.00
10.00 1.28 0.00 0.00
10.25 1.36 0.00 0.00
10.50 1.45 0.00 0.05
10.75 1.55 0.01 0.19
11.00 1.67 0.02 0.41
11.25 1.82 0.03 0.74
11.50 2.01 0.06 1.35
11.75 2.74 0.25 5.07
12.00 4.70 1.13 37.40
12.25 5.01 1.30 23.22
12.50 5.21 1.43 9.36
12.75 5.35 1.51 5.67
13.00 5.47 1.59 4.56
13.25 5.58 1.65 3.86
13.50 5.66 1.71 3.41
13.75 5.74 1.76 3.02
14.00 5.81 1.80 2.70
14.25 5.88 1.84 2.44
14.50 5.94 1.88 2.31
14.75 6.00 1.92 2.20
15.00 6.05 1.96 2.10
15.25 6.10 1.99 1.99
15.50 6.15 2.02 1.89
15.75 6.20 2.05 1.78
16.00 6.24 2.08 1.67
16.25 6.28 2.11 1.57
16.50 6.32 2.13 1.52
16.75 6.36 2.16 1.48
17.00 6.39 2.18 1.44
17.25 6.43 2.21 1.41
17.50 6.46 2.23 1.37
17.75 6.50 2.25 1.33
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 6.53 2.28 1.29
18.25 6.56 2.30 1.25
18.50 6.59 2.32 1.21
18.75 6.62 2.34 1.17
19.00 6.65 2.36 1.13
19.25 6.68 2.38 1.08
19.50 6.70 2.39 1.04
19.75 6.73 2.41 1.00
20.00 6.75 2.43 0.96
31
Cottonwood-POND 1 -PRE Type 1124-hr 900-year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD®9 00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Page 16
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=14.200 ac 0.00% Impervious Runoff Depth>2.98"
Flow Length=917' Tc=15.1 min CN=60 Runoff=58.78 cfs 3.522 of
Total Runoff Area =14.200 ac Runoff Volume = 3.522 of Average Runoff Depth = 2.98"
100.00% Pervious =14.200 ac 0.00% Impervious = 0.000 ac
•
•
32
Cottonwood-POND 1 -PRE Type 11 24-hr 100-year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Pane 17
Summary for Subcatchment 1S: DA -1
Runoff - 58.78 cfs @ 12.08 hrs, Volume= 3.522 af, Depth> 2.98"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100-year Rainfall=7.92"
Area (ac) CN Description
14.200 60 Woods, Fair, HSG B
14.200 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
•
12.3 100 0.0700 0.14 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.60"
1.2 445 0.1400 6.02 Shallow Concentrated Flow, Shallow
Unpaved Kv=16.1 fps
1.6 372 0.1020 3.97 15.89 Channel Flow, Channel -1
Area= 4.0 sf Perim= 7.3' r= 0.55'
n= 0.080 Earth, long dense weeds
15.1 917 Total
Subcatchment 1S: DA -1
Hydrograph
RunoN
•
40
9 35
9 30
"I
10
5
.........I..
1 12 13
Time (hours)
Type II 24-hr-100-year
Rainfall=7.92"
Runoff Area=14.200 ac
Runoff Volume=3:522 of
Runoff Depth>2.98"
Flow Length=917'
Tc=15.1 min
CN=60
18 19 20
33
Cottonwood-POND 1 -PRE Type 1124-hr 100 year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 18
Hydrograph for Subcatchment 1 S: DA -1
0
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.50 0.00 0.00
5.25 0.53 0.00 0.00
5.50 0.56 0.00 0.00
5.75 0.60 0.00 0.00
6.00 0.63 0.00 0.00
6.25 0.67 0.00 0.00
6.50 0.71 0.00 0.00
6.75 0.74 0.00 0.00
7.00 0.78 0.00 0.00
7.25 0.82 0.00 0.00
7.50 0.87 0.00 0.00
7.75 0.91 0.00 0.00
8.00 0.95 0.00 0.00
8.25 1.00 0.00 0.00
8.50 1.05 0.00 0.00
8.75 1.10 0.00 0.00
9.00 1.16 0.00 0.00
9.25 1.23 0.00 0.00
9.50 1.29 0.00 0.00
9.75 1.36 0.00 0.00
10.00 1.43 0.00 0.04
10.25 1.52 0.01 0.15
10.50 1.62 0.01 0.29
10.75 1.73 0.02 0.50
11.00 1.86 0.04 0.80
11.25 2.03 0.07 1.25
11.50 2.24 0.11 2.05
11.75 3.07 0.36 7.05
12.00 5.25 1.45 47.09
12.25 5.59 1.66 28.35
12.50 5.82 1.81 11.27
12.75 5.98 1.91 6.79
13.00 6.11 2.00 5.45
13.25 6.23 2.07 4.60
13.50 6.33 2.14 4.06
13.75 6.42 2.20 3.59
14.00 6.49 2.25 3.21
14.25 6.57 2.30 2.89
14.50 6.63 2.35 2.74
14.75 6.70 2.39 2.61
15.00 6.76 2.43 2.49
15.25 6.82 2.48 2.36
15.50 6.87 2.51 2.23
15.75 6.92 2.55 2.10
16.00 6.97 2.58 1.97
16.25 7.01 2.61 1.85
16.50 7.06 2.64 1.80
16.75 7.10 2.68 1.75
17.00 7.14 2.70 1.70
17.25 7.18 2.73 1.66
17.50 7.22 2.76 1.61
17.75 7.26 2.79 1.56
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 7.29 2.81 1.52
18.25 7.33 2.84 1.47
18.50 7.36 2.86 1.42
18.75 7.40 2.89 1.37
19.00 7.43 2.91 1.32
19.25 7.46 2.93 1.27
19.50 7.49 2.95 1.23
19.75 7.51 2.97 1.18
20.00 7.54 2.99 1.13
34

1S vl\ 1P
•
DA- 1
WET POND #1
0 1 subcat Reach on [Link
35
Cottonwood-POND 1 -POST-FUTURE
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 2
Area Listing (all nodes)
Area CN Description
(acres) (subcatchment-numbers)
6.900 61 >75% Grass cover, Good, HSG B (1S)
9.400 98 Paved roads w/curbs & sewers, HSG B (1S)
16.300 TOTAL AREA
C?
•
36
Cottonwood-POND 1 -POST-FUTURE
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 3
Soil Listing (ail nodes)
Area Soil Subcatchment
(acres)
0.000
16.300
0.000
0.000
0.000
16.300

•
Goup Numbers
HSG A
HSG B 1S
HSG C
HSG D
Other
TOTAL AREA
37
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 1-year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
. HydroCAD®9 00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 4
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=16.300 ac 57.67% Impervious Runoff Depth>1.25"
Tc=5.0 min CN=82 Runoff=40.05 cfs 1.698 of
Pond 1 P: WET POND #1 Peak Elev=712.17' Storage=3.104 of Inflow=40.05 cfs 1.698 of
Primary=2.19 cfs 0.754 of Secondary=0.00 cfs 0.000 of Outflow=2.19 cfs 0.754 of
Total Runoff Area =16.300 ac Runoff Volume =1.698 of Average Runoff Depth =1.26"
42.33% Pervious = 6.900 ac 57.67% Impervious = 9.400 ac
•
is
38
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 1-year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 1S: DA -1
•
•
(49) Hint: Tc<2dt may require smaller dt
Runoff = 40.05 cfs @ 11.96 hrs, Volume= 1.698 af, Depth> 1.25"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-year Rainfall=2.98"
Area (ac) CN Description
6.900 61 >75% Grass cover, Good, HSG B
9.400 98 Paved roads w/curbs 8 sewers, HSG B
16.300 82 Weighted Average
6.900 42.33% Pervious Area
9.400 57.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1S: DA -1
Hydrograph
LL
28
6
0
a 9 10 11 12 13
Time (hours)
Type II 24-hr 1-year
Rainfall=2.98"
Runoff Area=16.300 ac
Runoff Volume=1.698 of
Runoff Depth>1.26"
Tc=5:0 Irvin
CN=82
1s
a Runoff
39
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 1-year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
i HydroCAD@ 9 00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 6
Hydrograph for Subcatchment IS: DA -1
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.19 0.00 0.00
5.25 0.20 0.00 0.00
5.50 0.21 0.00 0.00
5.75 0.23 0.00 0.00
6.00 0.24 0.00 0.00
6.25 0.25 0.00 0.00
6.50 0.27 0.00 0.00
6.75 0.28 0.00 0.00
7.00 0.30 0.00 0.00
7.25 0.31 0.00 0.00
7.50 0.33 0.00 0.00
7.75 0.34 0.00 0.00
8.00 0.36 0.00 0.00
8.25 0.37 0.00 0.00
8.50 0.39 0.00 0.00
8.75 0.42 0.00 0.00
9.00 0.44 0.00 0.00
9.25 0.46 0.00 0.02
9.50 0.49 0.00 0.05
9.75 0.51 0.00 0.10
10.00 0.54 0.00 0.15
10.25 0.57 0.01 0.22
10.50 0.61 0.01 0.32
10.75 0.65 0.02 0.46
11.00 0.70 0.03 0.64
11.25 0.76 0.04 0.99
11.50 0.84 0.06 1.50
11.75 1.15 0.18 9.76
12.00 1.98 0.63 35.41
12.25 2.10 0.72 5.32
12.50 2.19 0.78 3.52
12.75 2.25 0.82 2.66
13.00 2.30 0.85 2.25
13.25 2.34 0.88 1.96
13.50 2.38 0.91 1.73
13.75 2.41 0.94 1.54
14.00 2.44 0.96 1.37
14.25 2.47 0.98 1.28
14.50 2.50 1.00 1.22
14.75 2.52 1.01 1.16
15.00 2.54 1.03 1.10
15.25 2.57 1.05 1.05
15.50 2.59 1.06 0.98
15.75 2.60 1.08 0.92
16.00 2.62 1.09 0.86
16.25 2.64 1.10 0.83
16.50 2.66 1.11 0.81
16.75 2.67 1.13 0.79
17.00 2.69 1.14 0.77
17.25 2.70 1.15 0.74
17.50 2.72 1.16 0.72
17.75 2.73 1.17 0.70
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 2.74 1.18 0.68
18.25 2.76 1.19 0.66
18.50 2.77 1.20 0.63
18.75 2.78 1.21 0.61
19.00 2.79 1.22 0.59
19.25 2.81 1.23 0.57
19.50 2.82 1.24 0.54
19.75 2.83 1.24 0.52
20.00 2.84 1.25 0.50
40
Cottonwood-POND 1-POST-FUTURE Type 1124-hr 1-year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD09 00 s/n 04719 02009 HydroCAD Software Solutions LLC Pace 7
Summary for Pond 1P: WET POND #1
Inflow Area = 16.300 ac, 57.67% Impervious, Inflow Depth > 1.25" for 1-year event
Inflow = 40.05 cfs @ 11.96 hrs, Volume= 1.698 of
Outflow = 2.19 cfs @ 13.03 hrs, Volume= 0.754 af, Atten= 95%, Lag= 64.5 min
Primary = 2.19 cfs @ 13.03 hrs, Volume= 0.754 of
Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Starting Elev= 710.50' Surf.Area= 0.526 ac Storage= 2.073 of
Peak Elev= 712.17'@ 13.03 hrs Surf.Area= 0.669 ac Storage= 3.104 of (1.031 of above start)
Plug-Flow detention time= (not calculated: initial storage excedes outflow)
Center-of-Mass det. time= 121.0 min ( 912.9 - 791.8 )
Volume Invert Avail.Storage Storage Description
#1 704.00' 5.676 of Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
704.00 0.074 0.000 0.000
705.00 0.227 0.151 0.151
706.00 0.265 0.246 0.397
•
707.00 0.309 0.287 0.684
708.00 0.356 0.333 1.016
709.00 0.405 0.381 1.397
710.00 0.456 0.431 1.827
710.50 0.526 0.245 2.073
711.00 0.600 0.281 2.354
712.00 0.658 0.629 2.983
713.00 0.721 0.690 3.673
714.00 0.816 0.769 4.441
715.00 0.821 0.819 5.260
715.50 0.846 0.417 5.676
Device Routing Invert Outlet Devices
#1 Primary 704.00' 30.0" Round 30" RCP Culvert
L= 264.0' RCP, groove end projecting, Ke= 0.200
Outlet Invert= 701.36' S= 0.0100'/' Cc= 0.900
n= 0.013 Concrete pipe, straight & clean
#2 Device 1 710.50' 3.0" Vert. 3" diameter orifice C= 0.600
#3 Device 1 712.00' 24.0" W x 6.0" H Vert. 4 - 24" x 6" Orifices X 4.00 C= 0.600
#4 Device 1 713.50' 48.0" x 48.0" Horiz. 4`x4' box inside diameter C=0.600
Limited to weir flow at low heads
#5 Secondary 714.50' 12.0' long x 24.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
r?
L
41
Cottonwood-POND 1 -POST-FUTURE
Prepared by WSP SELLS
. HydroCAD® 9.00 s/n 04719 0 2009 HydroCAD
Type 11 24-hr 1-year Rainfall=2.98"
Printed 6123/2011
parlp R
primary OutFlow Max=2.17 cfs @ 13.03 hrs HW=712.17' (Free Discharge)
E t =30" RCP Culvert (Passes 2.17 cfs of 59.51 cfs potential flow)
2=3" diameter orifice (Orifice Controls 0.29 cfs @ 5.99 fps)
3=4 - 24" x 6" Orifices (Orifice Controls 1.88 cfs @ 1.34 fps)
=4'x4' box Inside diameter ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cis @ 5.00 hrs HW=710.50' (Free Discharge)
S=Broad-Crested Rectangular Weir (Controls 0.00 cfs)
Pond 1 P: WET POND #1
Inflow
40.os u. 1-1 Outflow
44 Inflow Area=16.300 ac M Primary
.
? Secondary
40= Peak Elev=712.17'
36= Storage=3.104 of
34'
32 .
30:
28:
Ln 26
24
22 `- •
9 10 11 12 13 14 15 16 17
Time (hours)
u
42
Cottonwood-POND 1-POST-FUTURE Type 1124-hr 1 -year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
• HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 9

Hydrograph fo r Pond 1 P: WET POND #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (acre-feet) (feet) (cfs) (cfs) (cfs)
5.00 0.00 2.073 710.50 0.00 0.00 0.00
5.50 0.00 2.073 710.50 0.00 0.00 0.00
6.00 0.00 2.073 710.50 0.00 0.00 0.00
6.50 0.00 2.073 710.50 0.00 0.00 0.00
7.00 0.00 2.073 710.50 0.00 0.00 0.00
7.50 0.00 2.073 710.50 0.00 0.00 0.00
8.00 0.00 2.073 710.50 0.00 0.00 0.00
8.50 0.00 2.073 710.50 0.00 0.00 0.00
9.00 0.00 2.073 710.50 0.00 0.00 0.00
9.50 0.05 2.073 710.50 0.00 0.00 0.00
10.00 0.15 2.077 710.51 0.00 0.00 0.00
10.50 0.32 2.087 710.53 0.00 0.00 0.00
11.00 0.64 2.106 710.56 0.01 0.01 0.00
11.50 1.50 2.147 710.63 0.04 0.04 0.00
12.00 35.41 2.754 711.64 0.24 0.24 0.00
12.50 3.52 3.073 712.13 1.59 1.59 0.00
13.00 2.25 3.103 712.17 2.19 2.19 0.00
13.50 1.73 3.097 712.16 2.01 2.01 0.00
14.00 1.37 3.082 712.14 1.75 1.75 0.00
14.50 1.22 3.068 712.12 1.50 1.50 0.00
. 15.00
15.50 1.10
0.98 3.059
3.050 712.11
712.10 1.32
1.17 1.32
1.17 0.00
0.00
16.00 0.86 3.043 712.09 1.04 1.04 0.00
16.50 0.81 3.037 712.08 0.93 0.93 0.00
17.00 0.77 3.033 712.07 0.85 0.85 0.00
17.50 0.72 3.030 712.07 0.79 0.79 0.00
18.00 0.68 3.027 712.06 0.74 0.74 0.00
18.50 0.63 3.024 712.06 0.70 0.70 0.00
19.00 0.59 3.022 712.06 0.65 0.65 0.00
19.50 0.54 3.019 712.05 0.60 0.60 0.00
20.00 0.50 3.017 712.05 0.56 0.56 0.00
•
43
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr I -year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 10
Stage-Discharge for Pond 1 P: WET POND #1
•
•
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
704.00 0.00 0.00 0.00
704.15 0.00 0.00 0.00
704.30 0.00 0.00 0.00
704.45 0.00 0.00 0.00
704.60 0.00 0.00 0.00
704.75 0.00 0.00 0.00
704.90 0.00 0.00 0.00
705.05 0.00 0.00 0.00
705.20 0.00 0.00 0.00
705.35 0.00 0.00 0.00
705.50 0.00 0.00 0.00
705.65 0.00 0.00 0.00
705.80 0.00 0.00 0.00
705.95 0.00 0.00 0.00
706.10 0.00 0.00 0.00
706.25 0.00 0.00 0.00
706.40 0.00 0.00 0.00
706.55 0.00 0.00 0.00
706.70 0.00 0.00 0.00
706.85 0.00 0.00 0.00
707.00 0.00 0.00 0.00
707.15 0.00 0.00 0.00
707.30 0.00 0.00 0.00
707.45 0.00 0.00 0.00
707.60 0.00 0.00 0.00
707.75 0.00 0.00 0.00
707.90 0.00 0.00 0.00
708.05 0.00 0.00 0.00
708.20 0.00 0.00 0.00
708.35 0.00 0.00 0.00
708.50 0.00 0.00 0.00
708.65 0.00 0.00 0.00
708.80 0.00 0.00 0.00
708.95 0.00 0.00 0.00
709.10 0.00 0.00 0.00
709.25 0.00 0.00 0.00
709.40 0.00 0.00 0.00
709.55 0.00 0.00 0.00
709.70 0.00 0.00 0.00
709.85 0.00 0.00 0.00
710.00 0.00 0.00 0.00
710.15 0.00 0.00 0.00
710.30 0.00 0.00 0.00
710.45 0.00 0.00 0.00
710.60 0.02 0.02 0.00
710.75 0.08 0.08 0.00
710.90 0.12 0.12 0.00
711.05 0.15 0.15 0.00
711.20 0.16 0.18 0.00
711.35 0.20 0.20 0.00
711.50 0.22 0.22 0.00
711.65 0.24 0.24 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
711.80 0.26 0.26 0.00
711.95 0.27 0.27 0.00
712.10 1.10 1.10 0.00
712.25 3.51 3.51 0.00
712.40 6.81 6.81 0.00
712.55 10.52 10.52 0.00
712.70 13.08 13.08 0.00
712.85 15.16 15.16 0.00
713.00 16.96 16.96 0.00
713.15 18.59 18.59 0.00
713.30 20.07 20.07 0.00
713.45 21.46 21.46 0.00
713.60 24.41 24.41 0.00
713.75 30.52 30.52 0.00
713.90 38.38 38.38 0.00
714.05 47.60 47.60 0.00
714.20 57.97 57.97 0.00
714.35 66.84 66.84 0.00
714.50 67.32 67.32 0.00
714.65 69.66 67.79 1.87
714.80 73.56 68.26 5.30
714.95 78.50 68.72 9.78
715.10 84.25 69.19 15.06
715.25 90.34 69.65 20.69
715.40 97.10 70.10 27.00
44
Cottonwood-POND 1 -POST-FUTURE Type 11 24-hr 1-year Rainfall=2.98"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 11
Stage-Area-Storage for Pond 1 P: WET POND #1
•
E
Elevation Surface Storage
(feet) (acres) (acre-feet)
704.00 0.074 0.000
704.15 0.097 0.023
704.30 0.120 0.045
704.45 0.143 0.068
704.60 0.166 0.090
704.75 0.189 0.113
704.90 0.212 0.135
705.05 0.229 0.163
705.20 0.235 0.200
705.35 0.240 0.237
705.50 0.246 0.273
705.65 0.252 0.310
705.80 0.257 0.347
705.95 0.263 0.384
706.10 0.269 0.425
706.25 0.276 0.468
706.40 0.283 0.511
706.55 0.289 0.554
706.70 0.296 0.597
706.85 0.302 0.640
707.00 0.309 0.684
707.15 0.316 0.733
707.30 0.323 0.783
707.45 0.330 0.833
707.60 0.337 0.883
707.75 0.344 0.933
707.90 0.351 0.983
708.05 0.358 1.035
708.20 0.366 1.092
708.35 0.373 1.149
708.50 0.381 1.206
708.65 0.388 1.263
708.80 0.395 1.320
708.95 0.403 1.377
709.10 0.410 1.440
709.25 0.418 1.504
709.40 0.425 1.569
709.55 0.433 1.633
709.70 0.441 1.698
709.85 0.448 1.762
710.00 0.456 1.827
710.15 0.477 1.901
710.30 0.498 1.974
710.45 0.519 2.048
710.60 0.541 2.129
710.75 0.563 2.213
710.90 0.585 2.298
711.05 0.603 2.385
711.20 0.612 2.480
711.35 0.620 2.574
711.50 0.629 2.669
711.65 0.638 2.763
Elevation Surface Storage
(feet) (acres) (acre-feet)
711.80 0.646 2.857
711.95 0.655 2.952
712.10 0.664 3.052
712.25 0.674 3.155
712.40 0.683 3.259
712.55 0.693 3.362
712.70 0.702 3.466
712.85 0.712 3.569
713.00 0.721 3.673
713.15 0.735 3.788
713.30 0.749 3.903
713.45 0.764 4.018
713.60 0.778 4.134
713.75 0.792 4.249
713.90 0.806 4.364
714.05 0.816 4.482
714.20 0.817 4.605
714.35 0.818 4.727
714.50 0.819 4.850
714.65 0.819 4.973
714.80 0.820 5.096
714.95 0.821 5.219
715.10 0.826 5.343
715.25 0.834 5.468
715.40 0.841 6.593
45
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 10 year Rainfall=5.27"
Prepared by WSP SELLS Printed 6/23/2011
HydroCADS 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 12
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=16.300 ac 57.67% Impervious Runoff Depth>3.09"
Tc=5.0 min CN=82 Runoff=95.38 cfs 4.199 of
Pond 1 P: WET POND #1 Peak Elev=713.59' Storage=4.126 of Inflow=95.38 cfs 4.199 of
Primary=24.27 cfs 3.222 of Secondary=0.00 cfs 0.000 of Outflow=24.27 cfs 3.222 of
Total Runoff Area =16.300 ac Runoff Volume = 4.199 of Average Runoff Depth = 3.09"
42.33% Pervious = 6.900 ac 57.67% Impervious = 9.400 ac
0
•
46
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 90-year Rainfall=5.27`
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 13
Summary for Subcatchment 1S: DA -1
[49] Hint: Tc<2dt may require smaller dt
Runoff = 95.38 cfs @ 11.95 hrs, Volume= 4.199 af, Depth> 3.09"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 10-year Rainfall=5.27'
Area (ac) CN Description
6.900 61 >75% Grass cover, Good, HSG B
9.400 98 Paved roads w/curbs & sewers, HSG 8
16.300 82 Weighted Average
6.900 42.33% Pervious Area
9.400 57.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1S: DA -1

Hydrograph
80
55
5o
AC
15
10
0
•
W.- u,
Type II 24-hr 10-year
Rainfall=5.27"
' Runoff Area=16.300 ac
Runoff Volume=4.199 of
Runoff Depth>349"
Tc=5.0 min
CN=82
8 7 8 9 10 11 12 13 14 15 18 17 18 19 20
Time (hours)
? Runoff
47
Cottonwood-POND 1 -POST-FUTURE Type 11 24-hr 10-year Rainfall=5.27`
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 14
Hydrograph for Subcatchment 1S: DA -1
•
is
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.33 0.00 0.00
5.25 0.35 0.00 0.00
5.50 0.38 0.00 0.00
5.75 0.40 0.00 0.00
6.00 0.42 0.00 0.00
6.25 0.45 0.00 0.00
6.50 0.47 0.00 0.03
6.75 0.50 0.00 0.07
7.00 0.52 0.00 0.11
7.25 0.55 0.01 0.15
7.50 0.58 0.01 0.19
7.75 0.60 0.01 0.24
8.00 0.63 0.02 0.28
8.25 0.66 0.02 0.35
8.50 0.70 0.03 0.44
8.75 0.73 0.03 0.54
9.00 0.77 0.04 0.65
9.25 0.82 0.06 0.73
9.50 0.86 0.07 0.80
9.75 0.90 0.08 0.94
10.00 0.95 0.10 1.13
10.25 1.01 0.12 1.38
10.50 1.08 0.14 1.69
10.75 1.15 0.17 2.14
11.00 1.24 0.21 2.70
11.25 1.35 0.27 3.75
11.50 1.49 0.34 5.17
11.75 2.04 0.67 28.47
12.00 3.49 1.78 82.01
12.25 3.72 1.97 11.72
12.50 3.87 2.10 7.66
12.75 3.98 2.19 5.76
13.00 4.07 2.26 4.82
13.25 4.14 2.33 4.19
13.50 4.21 2.38 3.68
13.75 4.27 2.43 3.27
14.00 4.32 2.48 2.90
14.25 4.37 2.52 2.70
14.50 4.41 2.56 2.57
14.75 4.46 2.60 2.45
15.00 4.50 2.63 2.32
15.25 4.54 2.67 2.19
15.50 4.57 2.70 2.06
15.75 4.61 2.73 1.93
16.00 4.64 2.76 1.80
16.25 4.67 2.78 1.73
16.50 4.70 2.81 1.68
16.75 4.72 2.83 1.63
17.00 4.75 2.86 1.59
17.25 4.78 2.88 1.54
17.50 4.80 2.90 1.50
17.75 4.83 2.93 1.45
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 4.85 2.95 1.40
18.25 4.88 2.97 1.35
18.50 4.90 2.99 1.31
18.75 4.92 3.01 1.26
19.00 4.94 3.03 1.21
19.25 4.96 3.05 1.17
19.50 4.98 3.06 1.12
19.75 5.00 3.08 1.07
20.00 5.02 3.09 1.02
48
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 10 year Rainfall=5.27"
Prepared by WSP SELLS Printed 6/23/2011
S HydroCAD09 00 s//n04719 02009 HydroCAD Software Solutions LLC Page 15
Summary for Pond 1 P: WET POND #1
Inflow Area = 16.300 ac, 57.67% Impervious, Inflow Depth > 3.09" for 10-year event
Inflow - 95.38 cfs @ 11.95 hrs, Volume= 4.199 of
Outflow = 24.27 cfs @ 12.11 hrs, Volume= 3.222 A Atten= 75%, Lag= 9.1 min
Primary = 24.27 cfs @ 12.11 hrs, Volume= 3.222 of
Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Starting Elev= 710.50' Surf.Area= 0.526 ac Storage= 2.073 of
Peak Elev= 713.59'@ 12.11 hrs Surf.Area= 0.777 ac Storage= 4.126 of (2.053 of above start)
Plug-Flow detention time= 287.8 min calculated for 1.150 of (27% of inflow)
Center-of-Mass det. time= 54.6 min ( 826.7 - 772.1 )
Volume Invert Avail.Storage Storage Description
#1 704.00' 5.676 of Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) ( acres) (acre-feet) (acre-feet)
704.00 0.074 0.000 0.000
705.00 0.227 0.151 0.151
706.00 0.265 0.246 0.397
707.00 0.309 0.287 0.684
708.00 0.356 0.333 1.016
709.00 0.405 0.381 1.397
710.00 0.456 0.431 1.827
710.50 0.526 0.245 2.073
711.00 0.600 0.281 2.354
712.00 0.658 0.629 2.983
713.00 0.721 0.690 3.673
714.00 0.816 0.769 4.441
715.00 0.821 0.819 5.260
715.50 0.846 0.417 5.676
Device Routing Invert Outlet Devices
#1 Primary 704.00' 30.0" Round 30" RCP Culvert
L= 264.0' RCP, groove end projecting, Ke= 0.200
Outlet Invert= 701.36' 8=0.0100'f Cc= 0.900
n= 0.013 Concrete pipe, straight & clean
#2 Device 1 710.50' 3.0" Vert. 3" diameter orifice C= 0.600
#3 Device 1 712.00' 24.0" W x 6.0" H Vert. 4 - 24" x 6" Orifices X 4.00 C= 0.600
#4 Device 1 713.50' 48.0" x 48.0" Horiz. 4'x4' box inside diameter C=0.600
Limited to weir flow at low heads
#5 Seconda ry 714.50' 12.0' long x 24.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
•
49
•

•
Cottonwood-POND 1 -POST-FUTURE
Prepared by WSP SELLS
HvdroCADO 9.00 sh 04719 © 2009 HvdroCAD
Type 11 24-hr 10-year Rainfall=5.27"
Printed 6/23/2011
Primary OutFlow Max=23.95 cis @ 12.11 hrs HW=713.59' (Free Discharge)
t- E2=3" 0" RCP Culvert (Passes 23.95 cis of 64.36 cis potential flow)
diameter orifice (Orifice Controls 0.41 cfs @ 8.28 fps)
=4 - 24" x 6" Orifices (Orifice Controls 22.23 cfs @ 5.56 fps)
=4'x4' box Inside diameter (Weir Controls 1.31 cfs @ 0.96 fps)
econdary OutFlow Max=0.00 cfs @ 5.00 hrs HW=710.50' (Free Discharge)
=Broad-Crested Rectangular Weir (Controls 0.00 cfs)
Pond 1 P: WET POND #1
Hydrograph
95.E tff
105: Inflow Area=1 6.300 ac
'95 Peak Elev=713.59'
855 Storage=4.126 of
'
9:
80--
75-1
70 _
65
60
55
50'
.
LL 45
40'.
35
30 ,
25
20-`
15
5 6
24 21 crs "
[ zs n?i's /?/i

1 12 13
Time (hours)
20
M Inflow
U Outflow
0 Primary
C1 Secondary
50
Cottonwood-POND 1-POST-FUTURE
Prepared by WSP SELLS
HydroCAD® 9.00 s/n 04719 0 2009 HydroCAD Software So
Type// 24-hr 10 year Rainfall=5.27"
Printed 6/23/2011
Hydrograph for Pond 1 P: WET POND #1
Time
(hours) Inflow
(cfs) Storage
(acre-feet) Elevation
(feet) Outflow
(cfs) Primary
(cfs) Secondary
(cfs)
5.00 0.00 2.073 710.50 0.00 0.00 0.00
5.50 0.00 2.073 710.50 0.00 0.00 0.00
6.00 0.00 2.073 710.50 0.00 0.00 0.00
6.50 0.03 2.073 710.50 0.00 0.00 0.00
7.00 0.11 2.076 710.51 0.00 0.00 0.00
7.50 0.19 2.082 710.52 0.00 0.00 0.00
8.00 0.28 2.092 710.53 0.00 0.00 0.00
8.50 0.44 2.106 710.56 0.01 0.01 0.00
9.00 0.65 2.128 710.60 0.02 0.02 0.00
9.50 0.80 2.157 710.65 0.04 0.04 0.00
10.00 1.13 2.193 710.71 0.07 0.07 0.00
10.50 1.69 2.248 710.81 0.10 0.10 0.00
11.00 2.70 2.332 710.96 0.14 0.14 0.00
11.50 5.17 2.482 711.20 0.18 0.18 0.00
12.00 82.01 3.913 713.31 20.20 20.20 0.00
12.50 7.66 3.808 713.18 18.85 18.85 0.00
13.00 4.82 3.413 712.62 11.86 11.86 0.00
13.50 3.68 3.234 712.36 6.01 6.01 0.00
14.00 2.90 3.170 712.27 3.96 3.96 0.00
14.50 2.57 3.138 712.23 3.11 3.11 0.00
15.00
15.50 2.32
2.06 3.121
3.109 712.20
712.18 2.65
2
33 2.65
2
33 0.00
0
00
16.00 1.80 3.098 712.17 .
2.05 .
2.05 .
0.00
16.50 1.68 3.089 712.15 1.87 1.87 0.00
17,00 1.59 3.082 712.14 1.74 1.74 0.00
17.50 1.50 3.076 712.13 1.63 1.63 0.00
18.00 1.40 3.070 712.13 1.53 1.53 0.00
18.50 1.31 3.065 712.12 1.44 1.44 0.00
19.00 1.21 3.060 712.11 1.34 1.34 0.00
19.50 1.12 3.055 712.10 1.24 1.24 0.00
20.00 1.02 3.049 712.10 1.15 1.15 0.00
•
51
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 10 year Rainfall=5.270
Prepared by WSP SELLS Printed 6/2312011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 18
Stage-Discharge for Pond 1 P: WET POND #1
•
•
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
704.00 0.00 0.00 0.00
704.15 0.00 0.00 0.00
704.30 0.00 0.00 0.00
704.45 0.00 0.00 0.00
704.60 0.00 0.00 0.00
704.75 0.00 0.00 0.00
704.90 0.00 0.00 0.00
705.05 0.00 0.00 0.00
705.20 0.00 0.00 0.00
705.35 0.00 0.00 0.00
705.50 0.00 0.00 0.00
705.65 0.00 0.00 0.00
705.80 0.00 0.00 0.00
705.95 0.00 0.00 0.00
706.10 0.00 0.00 0.00
706.25 0.00 0.00 0.00
706.40 0.00 0.00 0.00
706.55 0.00 0.00 0.00
706.70 0.00 0.00 0.00
706.85 0.00 0.00 0.00
707.00 0.00 0.00 0.00
707.15 0.00 0.00 0.00
707.30 0.00 0.00 0.00
707.45 0.00 0.00 0.00
707.60 0.00 0.00 0.00
707.75 0.00 0.00 0.00
707.90 0.00 0.00 0.00
708.05 0.00 0.00 0.00
708.20 0.00 0.00 0.00
708.35 0.00 0.00 0.00
708.50 0.00 0.00 0.00
708.65 0.00 0.00 0.00
708.80 0.00 0.00 0.00
708.95 0.00 0.00 0.00
709.10 0.00 0.00 0.00
709.25 0.00 0.00 0.00
709.40 0.00 0.00 0.00
709.55 0.00 0.00 0.00
709.70 0.00 0.00 0.00
709.85 0.00 0.00 0.00
710.00 0.00 0.00 0.00
710.15 0.00 0.00 0.00
710.30 0.00 0.00 0.00
710.45 0.00 0.00 0.00
710.60 0.02 0.02 0.00
710.75 0.08 0.08 0.00
710.90 0.12 0.12 0.00
711.05 0.15 0.15 0.00
711.20 0.18 0.18 0.00
711.35 0.20 0.20 0.00
711.50 0.22 0.22 0.00
711.65 0.24 0.24 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
711.80 0.26 0.26 0.00
711.95 0.27 0.27 0.00
712.10 1.10 1.10 0.00
712.25 3.51 3.51 0.00
712.40 6.81 6.81 0.00
712.55 10.52 10.52 0.00
712.70 13.08 13.08 0.00
712.85 15.16 15.16 0.00
713.00 16.96 16.96 0.00
713.15 18.59 18.59 0.00
713.30 20.07 20.07 0.00
713.45 21.46 21.46 0.00
713.60 24.41 24.41 0.00
713.75 30.52 30.52 0.00
713.90 38.38 38.38 0.00
714.05 47.60 47.60 0.00
714.20 57.97 57.97 0.00
714.35 66.84 66.84 0.00
714.50 67.32 67.32 0.00
714.65 69.66 67.79 1.87
714.80 73.56 68.26 5.30
714.95 78.50 68.72 9.78
715.10 84.25 69.19 15.06
715.25 90.34 69.65 20.69
715.40 97.10 70.10 27.00
52
Cottonwood-POND 1 -POST-FUTURE Type l! 24-hr 90 year Rainfall=5.27'
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 19
Stage-Area-Storage for Pond 1 P: WET POND #1
•
•
Elevation Surface Storage
(feet) (acres) (acre-feet)
704.00 0.074 0.000
704.15 0.097 0.023
704.30 0.120 0.045
704.45 0.143 0.068
704.60 0.166 0.090
704.75 0.189 0.113
704.90 0.212 0.135
705.05 0.229 0.163
705.20 0.235 0.200
705.35 0.240 0.237
705.50 0.246 0.273
705.65 0.252 0.310
705.80 0.257 0.347
705.95 0.263 0.384
706.10 0.269 0.425
706.25 0.276 0.468
706.40 0.283 0.511
706.55 0.289 0.554
706.70 0.296 0.597
706.85 0.302 0.640
707.00 0.309 0.684
707.15 0.316 0.733
707.30 0.323 0.783
707.45 0.330 0.833
707.60 0.337 0.883
707.75 0.344 0.933
707.90 0.351 0.983
708.05 0.358 1.035
708.20 0.366 1.092
708.35 0.373 1.149
708.50 0.381 1.206
708.65 0.388 1.263
708.80 0.395 1.320
708.95 0.403 1.377
709.10 0.410 1.440
709.25 0.418 1.504
709.40 0.425 1.569
709.55 0.433 1.633
709.70 0.441 1.698
709.85 0.448 1.762
710.00 0.456 1.827
710.15 0.477 1.901
710.30 0.498 1.974
710.45 0.519 2.048
710.60 0.541 2.129
710.75 0.563 2.213
710.90 0.585 2.298
711.05 0.603 2.385
711.20 0.612 2.480
711.35 0.620 2.574
711.50 0.629 2.669
711.65 0.638 2.763
Elevation Surface Storage
(feet) (acres) (acre-feet)
711.80 0.646 2.857
711.95 0.655 2.952
712.10 0.664 3.052
712.25 0.674 3.155
712.40 0.683 3.259
712.55 0.693 3.362
712.70 0.702 3.466
712.85 0.712 3.569
713.00 0.721 3.673
713.15 0.735 3.788
713.30 0.749 3.903
713.45 0.764 4.018
713.60 0.778 4.134
713.75 0.792 4.249
713.90 0.806 4.364
714.05 0.816 4.482
714.20 0.817 4.605
714.35 0.818 4.727
714.50 0.819 4.850
714.65 0.819 4.973
714.80 0.820 5.096
714.95 0.821 5.219
715.10 0.826 5.343
715.25 0.834 5.468
715.40 0.841 5.593
53
Cottonwood-POND 1-POST-FUTURE Type // 24-hr 25-year Rainfall=6.29"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 20
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=16.300 ac 57.67% Impervious Runoff Depth>3.97"
Tc=5.0 min CN=82 Runoff=120.72 cfs 5.396 of
Pond 1P: WET POND #1 Peak Elev=714.13' Storage=4.545 of Inflow=120.72 cfs 5.396 of
Primary=52.72 cfs 4.405 of Secondary=0.00 cfs 0.000 of Outflow=52.72 cfs 4.405 of
Total Runoff Area =16.300 ac Runoff Volume = 6.396 of Average Runoff Depth = 3.97"
42.33% Pervious = 6.900 ac 57.67% Impervious - 9.400 ac
•
•
54
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 25-year Rainfall=6.29x'
Prepared by WSP SELLS Printed 6/2312011
• HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Pace 21
Summary for Subcatchment 1S: DA -1
5.0
•
13
,a
[49] Hint: Tc<2dt may require smaller dt
Runoff - 120.72 cfs @ 11.95 hrs, Volume= 5.396 af, Depth> 3.97'
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 25-year Rainfall=6.29°
Area (ac) CN Description
6.900 61 >75% Grass cover, Good, HSG B
9.400 98 Paved roads w/curbs & sewers, HSG B
16.300 82 Weighted Average
6.900 42.33% Pervious Area
9.400 57.67% Impervious Area
Tc Length Slope Velocity Capacity Description
Direct Entry,
Subcatchment'IS: DA -1
Hydrograph
LL
•
®Runoff
IM as
Type II 24-hr 25-year
Rainfall=6.29"
Runoff Area=16.300 ac
Runoff Volume=5.396 of
Runoff Depth>3.97"
Tc=5.0 min
CN=82
r-r-i--r-r*-r?"r? rr-t-r? rT r-r• r-r i ? rr?rr r}-' i i rri i e * Tr i .rT-i i i r?
5 6 7 8 9 10 11 12 13 14 15 16 17 19 19 20
Time (hours)
55
•
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 25-year Rainfall=6.29"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 22
Hydrograph for Subcatchment 1S: DA -1
r?
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.40 0.00 0.00
5.25 0.42 0.00 0.00
5.50 0.45 0.00 0.00
5.75 0.48 0.00 0.04
6.00 0.50 0.00 0.09
6.25 0.53 0.00 0.14
6.50 0.56 0.01 0.19
6.75 0.59 0.01 0.24
7.00 0.62 0.01 0.29
7.25 0.65 0.02 0.34
7.50 0.69 0.03 0.40
7.75 0.72 0.03 0.46
8.00 0.75 0.04 0.52
8.25 0.79 0.05 0.61
8.50 0.83 0.06 0.74
8.75 0.88 0.07 0.88
9.00 0.92 0.09 1.04
9.25 0.97 0.11 1.15
9.50 1.03 0.12 1.22
9.75 1.08 0.14 1.41
10.00 1.14 0.17 1.67
10.25 1.21 0.20 2.02
10.50 1.28 0.23 2.44
10.75 1.37 0.28 3.04
11.00 1.48 0.33 3.77
11.25 1.61 0.41 5.16
11.50 1.78 0.51 7.01
11.75 2.43 0.95 37.52
12.00 4.17 2.35 103.16
12.25 4.44 2.58 14.59
12.50 4.62 2.74 9.51
12.75 4.75 2.86 7.14
13.00 4.86 2.95 5.97
13.25 4.95 3.03 5.18
13.50 5.03 3.10 4.55
13.75 5.10 3.16 4.04
14.00 5.16 3.22 3.58
14.25 5.21 3.27 3.33
14.50 5.27 3.32 3.17
14.75 5.32 3.37 3.02
15.00 5.37 3.41 2.86
15.25 5.41 3.45 2.70
15.50 5.46 3.49 2.54
15.75 5.50 3.53 2.37
16.00 5.54 3.56 2.21
16.25 5.57 3.59 2.12
16.50 5.61 3.63 2.07
16.75 5.64 3.66 2.01
17.00 5.67 3.69 1.95
17.25 5.70 3.72 1.89
17.50 5.73 3.74 1.84
17.75 5.76 3.77 1.78
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 5.79 3.80 1.72
18.25 5.82 3.82 1.66
18.50 5.85 3.85 1.61
18.75 5.87 3.87 1.55
19.00 5.90 3.89 1.49
19.25 5.92 3.92 1.43
19.50 5.95 3.94 1.37
19.75 5.97 3.96 1.31
20.00 5.99 3.98 1.25
56
•
Cottonwood-POND 1 -POST-FUTURE
Prepared by WSP SELLS
Software Solutions LLC
Type 1124-hr 25-year Rainfall=6.29"
Printed 6/23/2011
Summary for Pond 1 P: WET POND #1

•
Inflow Area = 16.300 ac, 57.67% Impervious, Inflow Depth > 3.97" for 25-year event
Inflow = 120.72 cfs c@ 11.95 hrs, Volume= 5.396 of
Outflow = 52.72 cfs @ 12.06 hrs, Volume= 4.405 af, Atten= 56%, Lag= 6.6 min
Primary - 52.72 cfs @ 12.06 hrs, Volume= 4.405 of
Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Starting Elev= 710.50' Surf.Area= 0.526 ac Storage= 2.073 of
Peak Elev= 714.13'@ 12.06 hrs Surf.Area= 0.817 ac Storage= 4.545 of (2.472 of above start)
Plug-Flow detention time= 207.5 min calculated for 2.325 of (43% of inflow)
Center-of-Mass det. time= 49.4 min ( 815.8 - 766.3 )
Volume Invert Avail.Storage Storage Description
#1 704.00' 5.676 of Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
704.00 0.074 0.000 0.000
705.00 0.227 0.151 0.151
706.00 0.265 0.246 0.397
707.00 0.309 0.287 0.684
708.00 0.356 0.333 1.016
709.00 0.405 0.381 1.397
710.00 0.456 0.431 1.827
710.50 0.526 0.245 2.073
711.00 0.600 0.281 2.354
712.00 0.658 0.629 2.983
713.00 0.721 0.690 3.673
714.00 0.816 0.769 4.441
715.00 0.821 0.819 5.260
715.50 0.846 0.417 5.676
Device Routing Invert Outlet Devices
#1 Primary 704.00' 30.0" Round 30" RCP Culvert
L= 264.0' RCP, groove end projecting, Ke= 0.200
Outlet Invert= 701.36' S= 0.0100 T Cc= 0.900
n= 0.013 Concrete pipe, straight & clean
#2 Device 1 710.50' 3.0" Vert. 3" diameter orifice C= 0.600
#3 Device 1 712.00' 24.0" W x 6.0" H Vert. 4 - 24" x 6" Orifices X 4.00 C= 0.600
#4 Device 1 713.50' 48.0" x 48.0" Horiz. 4'x4' box Inside diameter C=0.600
Limited to weir flow at low heads
#5 Seconda ry 714.50' 12.0' long x 24.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
57
•
•
Cottonwood-POND 1 -POST-FUTURE
Prepared by WSP SELLS
Type// 24-hr 25-year Rainfall=6.29"
Printed 6/23/2011
Primary OutFlow Max=51.30 cfs @ 12.06 hrs HW=714.11' (Free Discharge)
L E=30" RCP Culvert (Passes 51.30 cfs of 66.06 cfs potential flow)
=3" diameter orifice (Orifice Controls 0.44 cfs @ 8.98 fps)
=4 - 24" x 6" Orifices (Orifice Controls 26.21 cfs @ 6.55 fps)
=4'x4' box inside diameter (Weir Controls 24.64 cfs @ 2.54 fps)
Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=710.50' (Free Discharge)
5=13road-Crested Rectangular Weir ( Controls 0.00 cfs)
Pond 1 P: WET POND #1
1
1
U.
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Time (hours)
C7
58
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 25 year Rainfall=6.29"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 25
Hydrograph for Pond 1 P: WET POND #1
Time Inflow Storage Elevation Outflow Primary
5.00 0.00 2.073 710.50 0.00 0.00 0.00
5.50 0.00 2.073 710.50 0.00 0.00 0.00
6.00 0.09 2.074 710.50 0.00 0.00 0.00
6.50 0.19 2.080 710.51 0.00 0.00 0.00
7.00 0.29 2.090 710.53 0.00 0.00 0.00
7.50 0.40 2.104 710.56 0.01 0.01 0.00
8.00 0.52 2.122 710.59 0.02 0.02 0.00
8.50 0.74 2.147 710.63 0.04 0.04 0.00
9.00 1.04 2.181 710.69 0.06 0.06 0.00
9.50 1.22 2.226 710.77 0.09 0.09 0.00
10.00 1.67 2.280 710.87 0.12 0.12 0.00
10.50 2.44 2.359 711.01 0.15 0.15 0.00
11.00 3.77 2.478 711.20 0.18 0.18 0.00
11.50 7.01 2.686 711.53 0.22 0.22 0.00
12.00 103.16 4.403 713.95 41.44 41.44 0.00
12.50 9.51 3.992 713.42 21.16 21.15 0.00
13.00 5.97 3.547 712.82 14.72 14.72 0.00
13.50 4.55 3.293 712.45 8.10 8.10 0.00
14.00 3.58 3.202 712.32 4.97 4.97 0.00
14.50 3.17 3.164 712.26 3.79 3.79 0.00
15.00 2.86 3.144 712.23 3.26 3.26 0.00
.
15.50 2.54 3.129 712.21 2.87 2.87 0.00
16.00 2.21 3.116 712.19 2.52 2.52 0.00
16.50 2.07 3.106 712.18 2.25 2.25 0.00
17.00 1.95 3.099 712.17 2.08 2.08 0.00
17.50 1.84 3.094 712.16 1.97 1.97 0.00
18.00 1.72 3.089 712.15 1.86 1.86 0.00
18.50 1.61 3.082 712.14 1.75 1.75 0.00
19.00 1.49 3.076 712.14 1.64 1.64 0.00
19.50 1.37 3.070 712.13 1.53 1.53 0.00
20.00 1.25 3.064 712.12 1.41 1.41 0.00

59
Cottonwood-POND 1 -POST-FUTURE Type 11 24-hr 25-year Rainfall=6.29"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD@ 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 26
Stage-Discharge for Pond 1 P: WET POND #1
•
0
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
704.00 0.00 0.00 0.00
704.15 0.00 0.00 0.00
704.30 0.00 0.00 0.00
704.45 0.00 0.00 0.00
704.60 0.00 0.00 0.00
704.75 0.00 0.00 0.00
704.90 0.00 0.00 0.00
705.05 0.00 0.00 0.00
705.20 0.00 0.00 0.00
705.35 0.00 0.00 0.00
705.50 0.00 0.00 0.00
705.65 0.00 0.00 0.00
705.80 0.00 0.00 0.00
705.95 0.00 0.00 0.00
706.10 0.00 0.00 0.00
706.25 0.00 0.00 0.00
706.40 0.00 0.00 0.00
706.55 0.00 0.00 0.00
706.70 0.00 0.00 0.00
706.85 0.00 0.00 0.00
707.00 0.00 0.00 0.00
707.15 0.00 0.00 0.00
707.30 0.00 0.00 0.00
707.45 0.00 0.00 0.00
707.60 0.00 0.00 0.00
707.75 0.00 0.00 0.00
707.90 0.00 0.00 0.00
708.05 0.00 0.00 0.00
708.20 0.00 0.00 0.00
708.35 0.00 0.00 0.00
708.50 0.00 0.00 0.00
708.65 0.00 0.00 0.00
708.80 0.00 0.00 0.00
708.95 0.00 0.00 0.00
709.10 0.00 0.00 0.00
709.25 0.00 0.00 0.00
709.40 0.00 0.00 0.00
709.55 0.00 0.00 0.00
709.70 0.00 0.00 0.00
709.85 0.00 0.00 0.00
710.00 0.00 0.00 0.00
710.15 0.00 0.00 0.00
710.30 0.00 0.00 0.00
710.45 0.00 0.00 0.00
710.60 0.02 0.02 0.00
710.75 0.08 0.08 0.00
710.90 0.12 0.12 0.00
711.05 0.15 0.15 0.00
711.20 0.18 0.18 0.00
711.35 0.20 0.20 0.00
711.50 0.22 0.22 0.00
711.65 0.24 0.24 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
711.80 0.26 0.26 0.00
711.95 0.27 0.27 0.00
712.10 1.10 1.10 0.00
712.25 3.51 3.51 0.00
712.40 6.81 6.81 0.00
712.55 10.52 10.52 0.00
712.70 13.08 13.08 0.00
712.85 15.16 15.16 0.00
713.00 16.96 16.96 0.00
713.15 18.59 18.59 0.00
713.30 20.07 20.07 0.00
713.45 21.46 21.46 0.00
713.60 24.41 24.41 0.00
713.75 30.52 30.52 0.00
713.90 38.38 38.38 0.00
714.05 47.60 47.60 0.00
714.20 57.97 57.97 0.00
714.35 66.84 66.84 0.00
714.50 67.32 67.32 0.00
714.65 69.66 67.79 1.87
714.80 73.56 68.26 5.30
714.95 78.50 68.72 9.78
715.10 84.25 69.19 15.06
715.25 90.34 69.65 20.69
715.40 97.10 70.10 27.00
60
Cottonwood-POND 1 -POST-FUTURE Type Il 24-hr 25-year Rainfall=6.29"
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 27
Stage-Area-Storage for Pond 1 P: WET POND #1
•
•
Elevation Surface Storage
(feet) (acres) (acre-feet)
704.00 0.074 0.000
704.15 0.097 0.023
704.30 0.120 0.045
704.45 0.143 0.068
704.60 0.166 0.090
704.75 0.189 0.113
704.90 0.212 0.135
705.05 0.229 0.163
705.20 0.235 0200
705.35 0.240 0.237
705.50 0.246 0.273
705.65 0.252 0.310
705.80 0.257 0.347
705.95 0.263 0.384
706.10 0.269 0.425
706.25 0.276 0.468
706.40 0.283 0.511
706.55 0.289 0.554
706.70 0.296 0.597
706.85 0.302 0.640
707.00 0.309 0.684
707.15 0.316 0.733
707.30 0.323 0.783
707.45 0.330 0.833
707.60 0.337 0.883
707.75 0.344 0.933
707.90 0.351 0.983
708.05 0.358 1.035
708.20 0.366 1.092
708.35 0.373 1.149
708.50 0.381 1.206
708.65 0.388 1.263
708.80 0.395 1.320
708.95 0.403 1.377
709.10 0.410 1.440
709.25 0.418 1.504
709.40 0.425 1.569
709.55 0.433 1.633
709.70 0.441 1.698
709.85 0.448 1.762
710.00 0.456 1.827
710.15 0.477 1.901
710.30 0.498 1.974
710.45 0.519 2.048
710.60 0.541 2.129
710.75 0.563 2.213
710.90 0.585 2.298
711.05 0.603 2.385
711.20 0.612 2.480
711.35 0.620 2.574
711.50 0.629 2.669
711.65 0.638 2.763
Elevation Surface Storage
_(feet) (acres) (acre-feet)
711.80 0.646 2.857
711.95 0.655 2.952
712.10 0.664 3.052
712.25 0.674 3.155
712.40 0.683 3.259
712.55 0.693 3.362
712.70 0.702 3.466
712.85 0.712 3.569
713.00 0.721 3.673
713.15 0.735 3.788
713.30 0.749 3.903
713.45 0.764 4.018
713.60 0.778 4.134
713.75 0.792 4.249
713.90 0.806 4.364
714.05 0.816 4.482
714.20 0.817 4.605
714.35 0,818 4.727
714.50 0.819 4.850
714.65 0.819 4.973
714.80 0.820 5.096
714.95 0.821 5.219
715.10 0.826 5.343
715.25 0.834 5.468
715.40 0.841 6.593
61
Cottonwood-POND 1 -POST-FUTURE Type 11 24-hr 50 year Rainfall=7.09"
• Prepared by WSP SELLS Printed 6/23/2011
HydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Pane 28
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=16.300 ac 57.67% Impervious Runoff Depth>4.68"
Tc=5.0 min CN=82 Runoff=140.64 cfs 6.354 of
Pond 1P: WET POND #1 Peak Elev=714.46' Storage=4.818 of Inflow=140.64 cfs 6.354 of
Primary=67.28 cfs 5.352 of Secondary=0.00 cfs 0.000 of Outflow=67.28 cfs 5.352 of
Total Runoff Area =16.300 ac Runoff Volume = 6.354 of Average Runoff Depth = 4.68"
42.33% Pervious = 6.900 ac 57.67% Impervious = 9.400 ac

•
62
Cottonwood-POND 1 -POST-FUTURE Type l/ 24-hr 50-year Rainfall=7.09"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 29
Summary for Subcatchment 1S: DA -1
•
[49] Hint: Tc<2dt may require smaller dt
Runoff = 140.64 cfs @ 11.95 hrs, Volume= 6.354 af, Depth> 4.68"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 50-year Rainfall=7.09"
Area (ac) CN Description
6.900 61 >75% Grass cover, Good, HSG B
9.400 98 Paved roads w/curbs & sewers, HSG B
16.300 82 Weighted Average
6.900 42.33% Pervious Area
9.400 57.67% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment 1S: DA -1
Hydrograph
140M a.
Type II 24-hr 50-year
Rainfall=7.09"
110- Runoff Area=16.300 ac
100. Runoff Volume=6.354 of
90-
80- Runoff Depth>4.68"
"
a 70 Tc=5.0 min
601 '1 a 1 CN=82
20
10
10 11
•
Time (hours)
18 18 20
? Run?f
63
•
Type Il 24-hr 50 year Rainfall=7.09"
Printed 6/23/2011
Hydrograph for Subcatchment IS: DA -1

Cottonwood-POND 1-POST-FUTURE
Prepared by WSP SELLS
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.45 0.00 0.00
5.25 0.48 0.00 0.05
5.50 0.51 0.00 0.10
5.75 0.54 0.00 0.15
6.00 0.57 0.01 0.21
6.25 0.60 0.01 0.27
6.50 0.63 0.02 0.33
6.75 0.67 0.02 0.39
7.00 0.70 0.03 0.45
7.25 0.74 0.04 0.52
7.50 0.77 0.04 0.58
7.75 0.81 0.05 0.65
8.00 0.85 0.07 0.72
8.25 0.89 0.08 0.85
8.50 0.94 0.09 1.00
8.75 0.99 0.11 1.18
9.00 1.04 0.13 1.37
9.25 1.10 0.15 1.50
9.50 1.16 0.18 1.58
9.75 1.22 0.20 1.81
10.00 1.28 0.23 2.13
10.25 1.36 0.27 2.55
10.50 1.45 0.32 3.05
10.75 1.55 0.37 3.77
11.00 1.67 0.44 4.65
11.25 1.82 0.53 6.31
11.50 2.01 0.65 8.50
11.75 2.74 1.18 44.75
12.00 4.70 2.81 119.75
12.25 5.01 3.08 16.83
12.50 5.21 3.27 10.96
12.75 5.35 3.40 8.22
13.00 5.47 3.51 6.87
13.25 5.58 3.60 5.95
13.50 5.66 3.68 5.22
13.75 5.74 3.75 4.64
14.00 5.81 3.82 4.11
14.25 5.88 3.87 3.82
14.50 5.94 3.93 3.64
14.75 6.00 3.98 3.46
15.00 6.05 4.03 3.28
15.25 6.10 4.08 3.09
15.50 6.15 4.13 2.91
15.75 6.20 4.17 2.72
16.00 6.24 4.21 2.54
16.25 6.28 4.24 2.43
16.50 6.32 4.28 2.37
16.75 6.36 4.32 2.30
17.00 6.39 4.35 2.24
17.25 6.43 4.38 2.17
17.50 6.46 4.42 2.10
17.75 6.50 4.45 2.04
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 6.53 4.48 1.97
18.25 6.56 4.51 1.90
18.50 6.59 4.53 1.84
18.75 6.62 4.56 1.77
19.00 6.65 4.59 1.70
19.25 6.68 4.61 1.64
19.50 6.70 4.64 1.57
19.75 6.73 4.66 1.50
20.00 6.75 4.68 1.43
64
Cottonwood-POND 1 -POST-FUTURE Type H 24-hr 50 year Rainfall=7.09"
. Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Page 31
Summary for Pond 1 P: WET POND #1
Inflow Area = 16.300 ac, 57.67% Impervious, Inflow Depth > 4.68" for 50-year event
Inflow = 140.64 cfs @ 11.95 hrs, Volume= 6.354 of
Outflow = 67.28 cis @ 12.07 hrs, Volume= 5.352 af, Atten= 52%, Lag= 6.8 min
Primary = 67.28 cfs @ 12.07 hrs, Volume= 5.352 of
Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Starting Elev= 710.50' Surf.Area= 0.526 ac Storage= 2.073 of
Peak Elev= 714.46'@ 12.05 hrs Surf.Area= 0.818 ac Storage= 4.818 of (2.746 of above start)
Plug-Flow detention time= 180.0 min calculated for 3.279 of (52% of inflow)
Center-of-Mass det. time= 46.7 min ( 809.2 - 762.5 )
Volume Invert Avail.Storage Storage Description
#1 704.00' 5.676 of Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
704.00 0.074 0.000 0.000
705.00 0.227 0.151 0.151
706.00 0.265 0.246 0.397
707.00 0.309 0.287 0.684
708.00 0.356 0.333 1.016
709.00 0.405 0.381 1.397
710.00 0.456 0.431 1.827
710.50 0.526 0.245 2.073
711.00 0.600 0.281 2.354
712.00 0.658 0.629 2.983
713.00 0.721 0.690 3.673
714.00 0.816 0.769 4.441
715.00 0.821 0.819 5.260
715.50 0.846 0.417 5.676
Device Routing Invert Outlet Devices
#1 Primary 704.00' 30.0" Round 30" RCP Culvert
L= 264.0' RCP, groove end projecting, Ke= 0.200
Outlet Invert= 701.36' S= 0.0100'/' Cc= 0.900
n= 0.013 Concrete pipe, straight & clean
#2 Device 1 710.50' 3.0" Vert. 3" diameter orifice C= 0.600
#3 Device 1 712.00' 24.0" W x 6.0" H Vert. 4 - 2,V' x 6" Orifices X 4.00 C= 0.600
#4 Device 1 713.50' 48.0" x 48.0" Horiz. 4'x4' box inside diameter C=0.600
Limited to weir flow at low heads
#5 Secondary 714.50' 12.0' long x 24.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

65
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 50-year Rainfal1=709"
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 32
Primary OutFlow Max=67.09 cfs @ 12.07 hrs HW=714.43' (Free Discharge)
'L E=310" RCP Culvert (Barrel Controls 67.09 cfs @ 13.67 fps)
=3" diameter orifice (Passes < 0.46 cfs potential flow)
=4 - 24" x 6" Orifices (Passes < 28.42 cfs potential flow)
=4'x4' box inside diameter (Passes < 46.88 cfs potential flow)
econdary OutFlow Max=0.00 cfs @ 5.00 hrs HW=710.50' (Free Discharge)
=Broad-Crested Rectangular Weir (Controls 0.00 cfs)
Pond 1 P: WET POND #1
U.
150:
140=
130:
120-:
110-
100-
1
6 7 8
•
66
140.64 Us
Inflow-Area=16.300 ac
Peak Elev=714.46'
Storage=4.818 of

1 12 13 14 15
Tlme (hours)
19
13 Inflow
0 outflow
El Primary
C:3 Secondary
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 50-year Rainfall=7.09"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 33
Hydrograph for Pond 1 P: WET POND #1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (acre-feet) (feet) (cfs) (cfs) (cfs)
5.00 0.00 2.073 710.50 0.00 0.00 0.00
5.50 0.10 2.074 710.50 0.00 0.00 0.00
6.00 0.21 2.081 710.51 0.00 0.00 0.00
6.50 0.33 2.092 710.53 0.00 0.00 0.00
7.00 0.45 2.107 710.56 0.01 0.01 0.00
7.50 0.58 2.128 710.60 0.02 0.02 0.00
8.00 0.72 2.154 710.64 0.04 0.04 0.00
8.50 1.00 2.187 710.70 0.06 0.06 0.00
9.00 1.37 2.233 710.78 0.09 0.09 0.00
9.50 1.58 2.290 710.89 0.12 0.12 0.00
10.00 2.13 2.360 711.01 0.15 0.15 0.00
10.50 3.05 2.459 711.17 0.17 0.17 0.00
11.00 4.65 2.608 711.40 0.21 0.21 0.00
11.50 8.50 2.862 711.81 0.26 0.26 0.00
12.00 119.75 4.712 714.33 65.79 65.79 0.00
12.50 10.96 4.065 713.51 22.11 22.11 0.00
13.00 6.87 3.620 712.92 16.07 16.07 0.00
13.50 5.22 3.337 712.51 9.73 9.73 0.00
14.00 4.11 3.226 712.35 5.73 5.73 0.00
14.50 3.64 3.182 712.29 4.30 4.30 0.00
15.00
15.50 3.28
2.91 3.161
3.145 712.26
712.23 3.71
3.28 3.71
3.28 0.00
0.00
16.00 2.54 3.130 712.21 2.89 2.89 0.00
16.50 2.37 3.118 712.20 2.58 2.58 0.00
17.00 2.24 3.111 712.19 2.39 2.39 0.00
17.50 2.10 3.105 712.18 2.23 2.23 0.00
18.00 1.97 3.100 712.17 2.10 2.10 0.00
18.50 1.84 3.095 712.16 1.98 1.98 0.00
19.00 1.70 3.088 712.15 1.86 1.86 0.00
19.50 1.57 3.082 712.14 1.74 1.74 0.00
20.00 1.43 3.075 712.13 1.61 1.61 0.00
•
67
Cottonwood-POND 1 -POST-FUTURE Type 11 24-hr 50-year Rainfall=7.09"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 34
Stage-Discharge for Pond 1 P: WET POND #1
•
•
Elevation Discharge Primary Secondary
_ (feet) (cfs) (cfs) (cfs)
704.00 0.00 0.00 0.00
704.15 0.00 0.00 0.00
704.30 0.00 0.00 0.00
704.45 0.00 0.00 0.00
704.60 0.00 0.00 0.00
704.75 0.00 0.00 0.00
704.90 0.00 0.00 0.00
705.05 0.00 0.00 0.00
705.20 0.00 0.00 0.00
705.35 0.00 0.00 0.00
705.50 0.00 0.00 0.00
705.65 0.00 0.00 0.00
705.80 0.00 0.00 0.00
705.95 0.00 0.00 0.00
706.10 0.00 0.00 0.00
706.25 0.00 0.00 0.00
706.40 0.00 0.00 0.00
706.55 0.00 0.00 0.00
706.70 0.00 0.00 0.00
706.85 0.00 0.00 0.00
707.00 0.00 0.00 0.00
707.15 0.00 0.00 0.00
707.30 0.00 0.00 0.00
707.45 0.00 0.00 0.00
707.60 0.00 0.00 0.00
707.75 0.00 0.00 0.00
707.90 0.00 0.00 0.00
708.05 0.00 0.00 0.00
708.20 0.00 0.00 0.00
708.35 0.00 0.00 0.00
708.50 0.00 0.00 0.00
708.65 0.00 0.00 0.00
708.80 0.00 0.00 0.00
708.95 0.00 0.00 0.00
709.10 0.00 0.00 0.00
709.25 0.00 0.00 0.00
709.40 0.00 0.00 0.00
709.55 0.00 0.00 0.00
709.70 0.00 0.00 0.00
709.85 0.00 0.00 0.00
710.00 0.00 0.00 0.00
710.15 0.00 0.00 0.00
710.30 0.00 0.00 0.00
710.45 0.00 0.00 0.00
710.60 0.02 0.02 0.00
710.75 0.08 0.08 0.00
710.90 0.12 0.12 0.00
711.05 0.15 0.15 0.00
711.20 0.18 0.18 0.00
711.35 0.20 0.20 0.00
711.50 0.22 0.22 0.00
711.65 0.24 0.24 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
711.80 0.26 0.26 0.00
711.95 0.27 0.27 0.00
712.10 1.10 1.10 0.00
712.25 3.51 3.51 0.00
712.40 6.81 6.81 0.00
712.55 10.52 10.52 0.00
712.70 13.08 13.08 0.00
712.85 15.16 15.16 0.00
713.00 16.96 16.96 0.00
713.15 18.59 18.59 0.00
713.30 20.07 20.07 0.00
713.45 21.46 21.46 0.00
713.60 24.41 24.41 0.00
713.75 30.52 30.52 0.00
713.90 38.38 38.38 0.00
714.05 47.60 47.60 0.00
714.20 57.97 57.97 0.00
714.35 66.84 66.84 0.00
714.50 67.32 67.32 0.00
714.65 69.66 67.79 1.87
714.80 73.56 68.26 5.30
714.95 78.50 68.72 9.78
715.10 84.25 69.19 15.06
715.25 90.34 69.65 20.69
715.40 97.10 70.10 27.00
68
Cottonwood-POND 1-POST-FUTURE Type // 24-hr 50 year Rainfall=7.09"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Paste 35
Stage-Area-Storage for Pond 1 P: WET POND #1
•
•
Elevation Surface Storage
(feet) (acres) (acre-feet)
704.00 0.074 0.000
704.15 0.097 0.023
704.30 0.120 0.045
704.45 0.143 0.068
704.60 0.166 0.090
704.75 0.189 0.113
704.90 0.212 0.135
705.05 0.229 0.163
705.20 0.235 0.200
705.35 0.240 0.237
705.50 0.246 0.273
705.65 0.252 0.310
705.80 0.257 0.347
705.95 0.263 0.384
706.10 0.269 0.425
706.25 0.276 0.468
706.40 0.283 0.511
706.55 0.289 0.554
706.70 0.296 0.597
706.85 0.302 0.640
707.00 0.309 0.684
707.15 0.316 0.733
707.30 0.323 0.783
707.45 0.330 0.833
707.60 0.337 0.883
707.75 0.344 0.933
707.90 0.351 0.983
708.05 0.358 1.035
708.20 0.366 1.092
708.35 0.373 1.149
708.50 0.381 1.206
708.65 0.388 1.263
708.80 0.395 1.320
708.95 0.403 1.377
709.10 0.410 1.440
709.25 0.418 1.504
709.40 0.425 1.569
709.55 0.433 1.633
709.70 0.441 1.698
709.85 0.448 1.762
710.00 0.456 1.827
710.15 0.477 1.901
710.30 0.498 1.974
710.45 0.519 2.048
710.60 0.541 2.129
710.75 0.563 2.213
710.90 0.585 2.298
711.05 0.603 2.385
711.20 0.612 2.480
711.35 0.620 2.574
711.50 0.629 2.669
711.65 0.638 2.763
Elevation Surface Storage
(feet) (acres) (acre-feet)
711.80 0.646 2.857
711.95 0.655 2.952
712.10 0.664 3.052
712.25 0.674 3.155
712.40 0.683 3.259
712.55 0.693 3.362
712.70 0.702 3.466
712.85 0.712 3.569
713.00 0.721 3.673
713.15 0.735 3.788
713.30 0.749 3.903
713.45 0.764 4.018
713.60 0.778 4.134
713.75 0.792 4.249
713.90 0.806 4.364
714.05 0.816 4.482
714.20 0.817 4.605
714.35 0.818 4.727
714.50 0.819 4.850
714.65 0.819 4.973
714.80 0.820 5.096
714.95 0.821 5.219
715.10 0.826 5.343
715.25 0.834 5.468
715.40 0.841 5.593
69
Cottonwood-POND 1-POST-FUTURE Type// 24-hr 900-year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 36
Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: DA -1 Runoff Area=16.300 ac 57.67% Impervious Runoff Depth>5.42"
Tc=5.0 min CN=82 Runoff=161.29 cfs 7.359 of
Pond 1 P: WET POND #1 Peak Elev=714.86' Storage=5.149 of Inflow=161.29 cfs 7.359 of
Primary=68.46 cfs 6.285 of Secondary=7,18 cfs 0.062 of Outflow=75.64 cfs 6.347 of
Total Runoff Area =16.300 ac Runoff Volume = 7.359 of Average Runoff Depth = 5.42"
42.33% Pervious = 6.900 ac 57.67% Impervious = 9.400 ac
•

70
Cottonwood-POND 1 -POST-FUTURE Type H 24-hr 900 year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
. HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment 1S: DA -1
[491 Hint: Tc<2dt may require smaller dt
Runoff - 161.29 cfs @ 11.95 hrs, Volume= 7.359 af, Depth> 5.42"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type II 24-hr 100-year Rainfall=7.92"
Area (ac) CN Description
6.900 61 >75% Grass cover, Good, HSG B
9.400 98 Paved roads w/curbs & sewers, HSG B
16.300 82 Weighted Average
6.900 42.33% Pervious Area
9.400 57.67% Impervious Area
5.0
Tc Length Slope Velocity Capacity Description
Direct Entry,
Subcatchment 1S: DA -1
•
Hydrograph
1
M
Type II 24-hr 100-year
Rainfal1=T9.2"
Runoff Area=16.300 ac
Runoff Volume=7.359 of
Runoff Depth>5.42"
Tc=5.0 min
CN=82
L`
5 6 T 8 9 10 11 12 13
Time (hours)
14
Runoff
71
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 900-year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Paae 38
Hydrograph for Subcatchment 1S: DA -1
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
5.00 0.50 0.00 0.09
5.25 0.53 0.00 0.15
5.50 0.56 0.01 0.21
5.75 0.60 0.01 0.28
6.00 0.63 0.02 0.34
6.25 0.67 0.02 0.41
6.50 0.71 0.03 0.49
6.75 0.74 0.04 0.56
7.00 0.78 0.05 0.64
7.25 0.82 0.06 0.71
7.50 0.87 0.07 0.79
7.75 0.91 0.08 0.87
8.00 0.95 0.10 0.95
8.25 1.00 0.11 1.10
8.50 1.05 0.13 1.30
8.75 1.10 0.15 1.51
9.00 1.16 0.18 1.74
9.25 1.23 0.21 1.88
9.50 1.29 0.24 1.98
9.75 1.36 0.27 2.25
10.00 1.43 0.31 2.62
10.25 1.52 0.36 3.12
10.50 1.62 0.41 3.71
10.75 1.73 0.48 4.56
11.00 1.86 0.56 5.59
11.25 2.03 0.67 7.53
11.50 2.24 0.81 10.08
11.75 3.07 1.43 52.31
12.00 5.25 3.30 136.92
12.25 5.59 3.61 19.15
12.50 5.82 3.82 12.46
12.75 5.98 3.97 9.33
13.00 6.11 4.09 7.80
13.25 6.23 4.20 6.75
13.50 6.33 4.29 5.92
13.75 6.42 4.37 5.26
14.00 6.49 4.44 4.66
14.25 6.57 4.51 4.33
14.50 6.63 4.57 4.13
14.75 6.70 4.63 3.92
15.00 6.76 4.69 3.71
15.25 6.82 4.75 3.50
15.50 6.87 4.80 3.29
15.75 6.92 4.84 3.08
16.00 6.97 4.89 2.87
16.25 7.01 4.93 2.75
16.50 7.06 4.97 2.68
16.75 7.10 5.01 2.60
17.00 7.14 5.05 2.53
17.25 7.18 5.09 2.45
17.50 7.22 5.12 2.38
17.75 7.26 5.16 2.30
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
18.00 7.29 5.19 2.23
18.25 7.33 5.23 2.15
18.50 7.36 5.26 2.08
18.75 7.40 5.29 2.00
19.00 7.43 5.32 1.93
19.25 7.46 5.35 1.85
19.50 7.49 5.37 1.77
19.75 7.51 5.40 1.70
20.00 7.54 5.42 1.62
72
Cottonwood-POND 1 -POST-FUTURE Type// 24-hr 900-year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 39
Summary for Pond 1 P: WET POND #1
Inflow Area = 16.300 ac, 57.67% Impervious, Inflow Depth > 5.42" for 100-year event
Inflow = 161.29 cfs @ 11.95 hrs, Volume= 7.359 of
Outflow = 75.64 cis @ 12.06 hrs, Volume= 6.347 af, Atten= 53%, Lag= 6.2 min
Primary - 68.46 cfs @ 12.06 hrs, Volume= 6.285 of
Secondary = 7.18 cfs @ 12.06 hrs, Volume= 0.062 of
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Starting Elev= 710.50' Surf.Area= 0.526 ac Storage= 2.073 of
Peak Elev= 714.86' @ 12.06 hrs Surf.Area= 0.820 ac Storage= 5.149 of (3.076 of above start)
Plug-Flow detention time= 160.7 min calculated for 4.260 of (58% of inflow)
Center-of-Mass det. time= 45.2 min ( 804.3 - 759.1 )
Volume Invert Avail.Storage Storage Description
#1 704.00' 5.676 of Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) ( acres) (acre-feet) (acre-feet)
704.00 0.074 0.000 0.000
705.00 0.227 0.151 0.151
706.00 0.265 0.246 0.397
707.00 0.309 0.287 0.684
708.00 0.356 0.333 1.016
709.00 0.405 0.381 1.397
710.00 0.456 0.431 1.827
710.50 0.526 0.245 2.073
711.00 0.600 0.281 2.354
712.00 0.658 0.629 2.983
713.00 0.721 0.690 3.673
714.00 0.816 0.769 4.441
715.00 0.821 0.819 5.260
715.50 0.846 0.417 5.676
Device Routing Invert Outlet Devices
#1 Primary 704.00' 30.0" Round 30" RCP Culvert
L= 264.0' RCP, groove end projecting, Ke= 0.200
Outlet Invert= 701.36' S= 0.0100T Cc= 0.900
n= 0.013 Concrete pipe, straight & clean
#2 Device 1 710.50' 3.0" Vert. 3" diameter orifice C= 0.600
#3 Device 1 712.00' 24.0" W x 6.0" H Vert. 4 - M' x 6" Orifices X 4.00 C= 0.600
#4 Device 1 713.50' 48.0" x 48.0" Horiz. 4'x4' box inside diameter C= 0.600
Limited to weir flow at low heads
#5 Secondary 714.50' 12.0' long x 24.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63

73
0
Cottonwood-POND 1 -POST-FUTURE
Prepared by WSP SELLS
Type// 24-hr 100-year Rainfall=7.92"
Printed 6/2312011
Primary OutFlow Max=68.42 cfs @ 12.06 hrs HW=714.85' (Free Discharge)
=30" RCP Culvert (Barrel Controls 68.42 cfs @ 13.94 fps)
2=3" diameter orifice (Passes < 0.49 cfs potential flow)
3=4 - 24" x 6" Orifices (Passes < 31.05 cfs potential flow)
=4'x4' box inside diameter (Passes < 82.16 cfs potential flow)
econdary OutFiow Max=6.75 cfs @ 12.06 hrs HW=714.85' (Free Discharge)
=Broad-Crested Rectangular Weir (Weir Controls 6.75 cis @ 1.60 fps)
Pond 1 P: WET POND #1
Hydrograph
•
180-
170-
160=:
150
1An
Inflow Area=16.300 ac
Peak Elev=714.86'
Storage=5.149 of
0 Inflow
? outflow
0 Primary
? Secondary
.f^
LL
8 9 10 11 12 13
Time (hours)

74
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 900-year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 41
Hydrograph for Pond 1 P: WET POND #1
Time Inflow Storage Elevation Outflow
5.00 0.09 2.073 710.50 0.00 0.00 0.00
5.50 0.21 2.079 710.51 0.00 0.00 0.00
6.00 0.34 2.090 710.53 0.00 0.00 0.00
6.50 0.49 2.107 710.56 0.01 0.01 0.00
7.00 0.64 2.130 710.60 0.02 0.02 0.00
7.50 0.79 2.158 710.65 0.04 0.04 0.00
8.00 0.95 2.192 710.71 0.07 0.07 0.00
8.50 1.30 2.234 710.79 0.10 0.10 0.00
9.00 1.74 2.292 710.89 0.12 0.12 0.00
9.50 1.98 2.364 711.02 0.15 0.15 0.00
10.00 2.62 2.451 711.15 0.17 0.17 0.00
10.50 3.71 2.573 711.35 0.20 0.20 0.00
11.00 5.59 2.753 711.63 0.24 0.24 0.00
11.50 10.08 3.054 712.10 1.23 1.23 0.00
12.00 136.92 5.015 714.70 70.87 67.95 2.92
12.50 12.46 4.144 713.61 25.04 25.04 0.00
13.00 7.80 3.698 713.03 17.33 17.33 0.00
13.50 5.92 3.389 712.59 11.19 11.19 0.00
14.00 4.66 3.251 712.39 6.56 6.56 0.00
14.50 4.13 3.200 712.31 4.88 4.88 0.00
15.00
15.50 3.71
3.29 3.177
3.160 712.28
712.26 4.14
3.69 4.14
3.69 0.00
0.00
16.00 2.87 3.144 712.23 3.26 3.26 0.00
16.50 2.68 3.131 712.21 2.92 2.92 0.00
17.00 2.53 3.123 712.20 2.70 2.70 0.00
17.50 2.38 3.116 712.19 2.53 2.53 0.00
18.00 2.23 3.110 712.18 2.37 2.37 0.00
18.50 2.08 3.104 712.18 2.22 2.22 0.00
19.00 1.93 3.099 712.17 2.06 2.06 0.00
19.50 1.77 3.093 712.16 1.94 1.94 0.00
20.00 1.62 3.085 712.15 1.81 1.81 0.00
•
75
Cottonwood-POND 1 -POST-FUTURE Type // 24-hr 100 year Rainfall=7.92"
• Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 sln 04719 ® 2009 HydroCAD Software Solutions LLC Page 42
Stage-Discharge for Pond 1 P: WET POND #1
.7
•
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
704.00 0.00 0.00 0.00
704.15 0.00 0.00 0.00
704.30 0.00 0.00 0.00
704.45 0.00 0.00 0.00
704.60 0.00 0.00 0.00
704.75 0.00 0.00 0.00
704.90 0.00 0.00 0.00
705.05 0.00 0.00 0.00
705.20 0.00 0.00 0.00
705.35 0.00 0.00 0.00
705.50 0.00 0.00 0.00
705.65 0.00 0.00 0.00
705.80 0.00 0.00 0.00
705.95 0.00 0.00 0.00
706.10 0.00 0.00 0.00
706.25 0.00 0.00 0.00
706.40 0.00 0.00 0.00
706.55 0.00 0.00 0.00
706.70 0.00 0.00 0.00
706.85 0.00 0.00 0.00
707.00 0.00 0.00 0.00
707.15 0.00 0.00 0.00
707.30 0.00 0.00 0.00
707.45 0.00 0.00 0.00
707.60 0.00 0.00 0.00
707.75 0.00 0.00 0.00
707.90 0.00 0.00 0.00
708.05 0.00 0.00 0.00
708.20 0.00 0.00 0.00
708.35 0.00 0.00 0.00
708.50 0.00 0.00 0.00
708.65 0.00 0.00 0.00
708.80 0.00 0.00 0.00
708.95 0.00 0.00 0.00
709.10 0.00 0.00 0.00
709.25 0.00 0.00 0.00
709.40 0.00 0.00 0.00
709.55 0.00 0.00 0.00
709.70 0.00 0.00 0.00
709.85 0.00 0.00 0.00
710.00 0.00 0.00 0.00
710.15 0.00 0.00 0.00
710.30 0.00 0.00 0.00
710.45 0.00 0.00 0.00
710.60 0.02 0.02 0.00
710.75 0.08 0.08 0.00
710.90 0.12 0.12 0.00
711.05 0.15 0.15 0.00
711.20 0.18 0.18 0.00
711.35 0.20 0.20 0.00
711.50 0.22 0.22 0.00
711.65 0.24 0.24 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
711.80 0.26 0.26 0.00
711.95 0.27 0.27 0.00
712.10 1.10 1.10 0.00
712.25 3.51 3.51 0.00
712.40 6.81 6.81 0.00
712.55 10.52 10.52 0.00
712.70 13.08 13.08 0.00
712.85 15.16 15.16 0.00
713.00 16.96 16.96 0.00
713.15 18.59 18.59 0.00
713.30 20.07 20.07 0.00
713.45 21.46 21.46 0.00
713.60 24.41 24.41 0.00
713.75 30.52 30.52 0.00
713.90 38.38 38.38 0.00
714.05 47.60 47.60 0.00
714.20 57.97 57.97 0.00
714.35 66.84 66.84 0.00
714.50 67.32 67.32 0.00
714.65 69.66 67.79 1.87
714.80 73.56 68.26 5.30
714.95 78.50 68.72 9.78
715.10 84.25 69.19 15.06
715.25 90.34 69.65 20.69
715.40 97.10 70.10 27.00
76
Cottonwood-POND 1 -POST-FUTURE Type 1124-hr 900-year Rainfall=7.92"
Prepared by WSP SELLS Printed 6/23/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 43
Stage-Area-Storage for Pond 1P: WET POND #1
•
•
Elevation Surface Storage
(feet) (acres) (acre-feet)
704.00 0.074 0.000
704.15 0.097 0.023
704.30 0.120 0.045
704.45 0.143 0.068
704.60 0.166 0.090
704.75 0.189 0.113
704.90 0.212 0.135
705.05 0.229 0.163
705.20 0.235 0.200
705.35 0.240 0.237
705.50 0.246 0.273
705.65 0.252 0.310
705.80 0.257 0.347
705.95 0.263 0.384
706.10 0.269 0.425
706.25 0.276 0.468
706.40 0.283 0.511
706.55 0.289 0.554
706.70 0.296 0.597
706.85 0.302 0.640
707.00 0.309 0.684
707.15 0.316 0.733
707.30 0.323 0.783
707.45 0.330 0.833
707.60 0.337 0.883
707.75 0.344 0.933
707.90 0.351 0.983
708.05 0.358 1.035
708.20 0.366 1.092
708.35 0.373 1.149
708.50 0.381 1.206
708.65 0.388 1.263
708.80 0.395 1.320
708.95 0.403 1.377
709.10 0.410 1.440
709.25 0.418 1.504
709.40 0.425 1.569
709.55 0.433 1.633
709.70 0.441 1.698
709.85 0.448 1.762
710.00 0.456 1.827
710.15 0.477 1.901
710.30 0.498 1.974
710.45 0.519 2.048
710.60 0.541 2.129
710.75 0.563 2.213
710.90 0.585 2.298
711.05 0.603 2.385
711.20 0.612 2.480
711.35 0.620 2.574
711.50 0.629 2.669
711.65 0.638 2.763
Elevation Surface Storage
(feet) (acres) (acre-feet)
711.80 0.646 2.857
711.95 0.655 2.952
712.10 0.664 3.052
712.25 0.674 3.155
712.40 0.683 3.259
712.55 0.693 3.362
712.70 0.702 3.466
712.85 0.712 3.569
713.00 0.721 3.673
713.15 0.735 3.788
713.30 0.749 3.903
713.45 0.764 4.018
713.60 0.778 4.134
713.75 0.792 4.249
713.90 0.806 4.364
714.05 0.816 4.482
714.20 0.817 4.605
714.35 0.818 4.727
714.50 0.819 4.850
714.65 0.819 4.973
714.80 0.820 5.096
714.95 0.821 5.219
715.10 0.826 5.343
715.25 0.834 5.468
715.40 0.841 5.593
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