20090940 Ver 1_Stormwater Info_20110705

'.WSPsSELLS
Transportation & Infrastructure
June 29, 2011
NCDENR
Division of Water Quality - 401 Oversight/Express Unit
2321 Crabtree Blvd., Suite 250
Raleigh, North Carolina 27604
919-715-3425
Attention: Ms. Annette Lucas
Reference: Permit No. 2009-0940
Revised Storm Water Management Plan
Dan River Combined Cycle Project
Eden, Rockingham County, NC
Dear Ms. Lucas:
NORTH CAROLINA
CONNECTICUT
MASSACHUSETTS
NEW HAMPSHIRE
NEW JERSEY
NEW YORK
PENNSYLVANIA
SOUTH CAROLINA
VIRGINIA
cq -
128 Overhill Drive
Suite 105
Mooresville, NC 281 17
Tel: [phone]
Fax: [phone]
www.wspsells.com
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?NR _
r GVATtt-K"?
d 3tn,,,,,,; a?AL
On behalf of Duke Energy, please find attached two copies of the revised Storm Water
Management Plan, one copy of the calculations, two copies of the Operations and Maintenance
Agreements for the wet detention pond #l, and one copy of the memorandum "Dan River
Combined Cycle Project - Design groundwater levels for storm water detention ponds" dated
December 15, 2010.
In summary, we revised BMP #1 from a bioretention area to a wet detention pond based on the
Memorandum showing that the seasonal high water elevation is 526 feet (not 518.8 feet). The
permanent pool elevation of the wet detention pond will be set at 526.5 feet.
If you have any questions or require additional information, please contact us.
Respectfully submitted,
WSP SELLS
Jonathan A. Carter, P.E.
Project Manager
cc: Mr. Mark McGary, Duke Energy
Mr. Michael Shekmer, P.E., Shaw Fossil Power
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Wet Detention Basin Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
? does ® does not
This system (check one):
? does ® does not
incorporate a vegetated filter at the outlet.
incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, the plants on the
vegetated shelf and perimeter of the basin should be watered twice weekly if
needed, until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish the plants on the vegetated shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After the wet detention pond is established, it should be inspected once a month and
within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County). Records of operation and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire BMP Trash/debris is resent. Remove the trash/ debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Vegetation is too short or too Maintain vegetation at a height of
long. approximately six inches.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 1 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
Swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged.
Erosion is occurring in the Regrade the swale if necessary to
swale. smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
The forebay Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design depth for possible. Remove the sediment and
sediment storage. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The vegetated shelf Best professional practices Prune according to best professional
show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessary.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the plants rather than spraying.
The main treatment area Sediment has accumulated to Search for the source of the
a depth greater than the sediment and remedy the problem if
original design sediment possible. Remove the sediment and
storage depth. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult a professional to remove
50% of the area. and control the algal growth.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray).
the basin surface.
Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
BMP element: Potential problem: How I will remediate the problem:
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs repair. if applicable)
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is damaged Repair or replace the outlet device.
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 401 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 521 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 523 feet in the forebay, the sediment
shall be removed.
BASIN DIAGRAM
ill in the blanks)
Sediment Removal
Bottom
0 Permanent Pool Elevation 526.5
523 Pe anen Pool
- - - - - - - - - - - - - - - - - - Volume Sediment Removal Elevation 521 Volume
522 -ft Min. ----------------------------- ------------ ------
Sediment Bottom Elevation 520 1-ft r
Storage Sedimei
Storage
FOREBAY MAIN POND
Form SW401-Wet Detention Basin O&M-Rev.4 Page 3 of 4
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Dan River Combined Cycle Turbine Project
BMP drainage area number:Wet Detention Pond #1
Print name:Stephen A Townsend Sr.
Title:General Manager Buck and Dan River Steam Stations
Address:900 S. Edgewood Road, Eden, NC 27288
Phone:
Signati
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, ),/, &'(- , a Notary Public for the State of
k/oPti 6 , County of ROL?1?a , do hereby certify that
eb?evl ??hSr?r?d . Sr personally appeared before me this
day of o) , and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
Pamela P. Burgess
Notary Public
Rockingham County
North Ca[olin
M Commission Ex ire-
SEAL
My commission expires 1 i _16 --QO15
Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4
S awe
a world of Solutions
Memorandum
128 S. Tryon St Suite 400, Charlotte, NC 28202 • MAIN 704-343-7500 • FAX [phone]
To: Danny Watson
From: David Bentler, Shaw Power, Geotechnical Engineer
Date: 12/15/2010
RE: Dan River Combined Cycle Project - Design groundwater levels for stormwater detention ponds
The purpose of this memorandum is to present conclusions and recommendations for design
groundwater conditions for stormwater detention ponds for the Dan River Combined Cycle Project developed
from a review of available data.
The Dan River steam plant maintains and monitors a number of piezometers and observation wells as
part of its operation of the project ash basin. Records from 8 monitoring wells, 11 piezometers, and 3
observation wells were obtained by Mr. Mark Petersen of the Shaw Group from Mr. George Tolbert, Duke
Energy, during a site visit on September 17, 2010. 1 reviewed these records and information from two
piezometers installed by S&ME for Shaw during construction of the combined cycle plant.
Table 1 contains monthly piezometer and observation well measurements associated with the ash
pond. Table 2 contains monitoring well measurements from April 2009, and Table 3 contains measurements
from two temporary observation wells installed at the stormwater detention pond locations. Figure 1 shows
the plan location of project features as well as the monitoring wells, observation wells, and piezometers.
Figure 2 contains a sketch of ash pond piezometer and observation well locations. Figure 3 illustrates
groundwater contours generated from the April 2009 monitoring well data.
The data from the Dan River plant groundwater monitoring program and temporary observation wells
supports several conclusions. First, the regional groundwater gradients are clearly shown to be northwest to
southeast at the north end of the combined cycle plant area and north to south at the south end. Second,
analysis of the plant groundwater data and the water levels recorded in the temporary observation wells
installed at the pond sites shows the water levels recorded in the observation wells at closure are consistent
with the regional groundwater regime. Third, analysis of the data, site topography, and groundwater boundary
conditions suggests a design seasonal high water table at elevation 526 feet is appropriate for bioretention
area #1. Fourth, similar analysis leads to a conclusion that there is a significant gradient across the pond #2 site
and a design water table of 512 feet at the north end and 518 feet at the south end of the pond site are
appropriate.
Finally, it is recommended to perform several test pits in the two pond areas prior to construction to
confirm the design groundwater levels recommended here. Please contact me with any questions you may
have on this matter.
CONFIDENTIALITY NOTICE: The information contained in this fax is intended for the use of the individual or entity named and may contain
information that is confidential, privileged and/or otherwise exempt from disclosure under applicable law. If you are not the intended recipient,
any dissemination, distribution or copying of this communication is strictly prohibited. If you received this communication in error, please notify
us immediately by telephone and return the original fax to us at the address shown. Thank You. Revised 10/14105
Table 1. Monthly Piezometer and Observation Well Measurements
DAN RIVER STEAM STATION
MONTHLY PIEZOMETER MEASUREMENTS
Dan River Piezometer and 0W anoWis.xlsx, and 2009 DRSS Piezometer Depth Measurement Spreadsheet.xslx
Plezometer Depth Measurements (feet)
Date Pt P2 P3 P4 P6 P6 P7 P9 PID P11 0W1 0W2 OW3
2/12/2003 13.8 7.7 12.3 8.7 8.8 13.1 4.3 12.7 8.7 9.8 10.9 12.7 5.6
3/19/2003 13.8 7.7 12.3 8.6 8.8 13.1 4.4 12.6 8.7 9.8 10.8 12.8 5.7
4/11/2003 13.9 7.7 12.3 8.8 8.7 13.1 4.5 12.6 8.7 9.7 10.7 12.7 5.5
5/21/2003 13.7 7.6 12.3 8.6 8.8 13.1 4.4 12.5 8.6 9.6 10.7 12.9 5.5
6/20/2003 13.6 7.4 12.3 8.6 8.9 13.1 4.4 125 8.8 9.6 10.6 12.9 5.4
7/16/2003 13.5 7.5 12.3 8.5 8.9 13.1 4.2 12.4 83 9.5 10.8 13 5.3
8/14/2003 13.6 7.4 12.3 8.6 9 13.1 4.5 12.7 8.7 9.7 10.7 12.8 5.6
9/12/2003 13.6 7.5 12.3 8.7 8.9 13.1 4.6 12.7 8.7 9.7 10.9 12.8 5.6
10/10/2003 13.7 7.5 12.3 8.8 8.8 13.1 4.7 12.6 8.8 9.8 10.8 12.6 5.5
11/8/2003 23.8 7.8 12.3 8.7 8.9 13.1 4.7 12.7 8.7 9.8 10.6 12.7 5.7
12/10/2003 13.7 7.9 12.3 8.8 9 13.1 4.6 12.7 8.6 9.9 10.7 12.4 5.6
1/19/2004 13.7 7.9 12.3 9 9.1 13.1 4.8 12.6 8.6 10 11 12.8 5.5
2/18/2004 13.5 7.7 12.3 8.8 9 13.1 4.6 12.6 8.6 9.9 10.8 12.6 5.6
3/23/2004 13.4 7.8 12.3 8.6 8.9 13.1 4.6 12.5 8.7 9.6 10.6 12.6 5.6
4/14/2004 13.2 7.6 12.3 8.4 9 13.1 4.4 12.6 8.8 9.7 10.5 12.9 5.7
5/19/2004 12.9 7.5 12.3 8.2 9 13.1 4.4 12.4 8.7 9.6 10.6 12.8 5.6
6/14/2004 13 7.4 12.3 S 8.8 13.1 43 12.8 8.7 9.5 10.4 13 5.8
7/20/2004 13.1 7.4 12.3 8 8.8 13.1 4.4 12.8 8.8 9.5 10.5 13 5.7
8/12/2004 13 7.5 12.3 8.2 8.9 13.1 4.3 12.6 8.7 9.6 10.4 12.8 5.5
9/22/2004 13.2 7.8 12.3 S.4 9 13.1 4.5 12 8.7 9.8 10.4 12.6 5.5
10/13/2004 13.5 7.6 12.3 8.5 9 13.1 4.6 11.8 8.8 9.9 10.6 12.8 5.4
11/11/2004 13.6 7.9 12.3 8.3 8.8 13.1 4.4 11.9 8.8 93 10.8 12.5 5.6
12/8/2004 13.9 8 12.3 8.8 9 13.1 4.5 11.7 8.8 10 10.6 12.4 5.3
1/19/2005 13.8 8.2 12.3 8.9 9 13.1 4.6 11.4 8.7 10 10.9 12.6 5.4
2/15/2005 14 8.1 12.3 9 9.1 13.1 4.7 11.5 8.6 10.1 11 12.5 5.5
3/10/2005 13.9 8.4 12.3 9.2 9.1 13.1 4.6 11.6 8.7 10.2 10.8 12.6 5.7
4/15/2005 14.1 8.2 12.3 9.3 8.9 13.1 4.8 11.2 8.8 9.8 10.7 12.3 5.5
5/18/2005 14 8.4 12.1 9.5 9 13.1 4.8 11.3 8.8 10 11 12.2 5.4
6/17/2005 14.2 8.6 12.3 9.6 9.1 13.1 4.8 10.9 8.8 10.3 11 12.2 5.3
7/19/2005 14.1 8.3 12.3 9 9 13.1 4.6 11.4 8.8 10.2 10.8 12.8 5.5
8/18/2005 13.7 7.8 123 9.3 8.9 13.1 4.8 12.2 8.6 9.8 11 12.4 5A
9/28/2005 13.6 7.7 12.3 9.3 8.8 13.1 4.6 12.1 8.7 9.8 10.9 12.3 5.3
10/13/2005 13.8 7.9 12.3 9.2 8.9 13.1 4.7 12 8.7 9.8 10.8 12.3 5.4
11/16/2005 13.8 8 12.3 9.3 8.8 13.1 4.9 11.9 8.6 10.1 11 12.4 5.4
12/12/2005 14 8.1 12.3 9.2 8.8 13.1 5 11.8 8.6 10.3 10.8 12.2 5.4
1/11/2006 13.8 8.2 12.3 9.4 8.9 13.1 5.1 11.6 8.7 10.2 11.1 12.5 5.5
2/16/2006 13.9 8.3 12.3 9.5 9 13.1 5.4 11.7 8.8 10.6 10.9 12.3 5.5
3/15/2006 13.7 8.1 12.3 9.6 8.7 13.1 5.5 11A 8.7 10.5 11 12.2 5.4
4/14/2006 13.8 8 12.3 9.6 8.8 13.1 5.8 11.5 8.9 10.9 11.1 12.4 5.2
5/17/2006 13.9 7.9 123 9.8 8.9 12.8 5.9 11.3 9 11.3 11.1 12.4 5.3
6/12/2006 14 7.8 12.3 9.9 8.7 12.9 6.2 11 9 11.5 11.2 12.3 5.4
7/18/2006 13.9 8 12.3 10 8.9 12.9 6.5 10.8 9.1 11.8 11.5 12.2 5.5
8/15/2006 13.9 7.9 12.3 9.9 8.8 12.8 6.7 10.6 9.3 12 11.7 12.2 5.5
9/20/2006 14.1 8 12.3 10.1 8.8 12.8 6.7 10.5 9.3 12.3 11.8 12.2 5.5
10/19/2006 14.1 7.9 12.3 10 8.8 12.9 6.7 10.7 9.2 12.3 11.6 12.2 5.4
11/21/2006 14 7.9 12.3 9.8 8.9 12.8 6.5 10.6 9.1 12.3 11.6 12.2 5.5
12/11/2007 14 7.8 12.3 9.8 8.9 12.9 6 10.8 9 11.9 11.4 12.2 5.8
1/18/2007 14.1 7.8 12.3 9.9 8.9 12.9 5.4 11 9 11.6 11.1 12.3 6
2/9/2007 14.1 7.9 12.3 9.8 8.9 13 5 11.2 8.9 11.3 10.8 12.4 6.2
3/16/2007 14 7.8 12.3 9.8 8.8 13 4.8 11.4 8.8 11 10.4 12.4 6.5
4/13/2007 13.9 7.9 12.3 9.7 8.6 13.1 4.4 11.6 8.8 11 10.2 12.4 6.8
5/11/2007 14.1 7.8 12.3 9.7 8.8 13.1 4.2 11.8 8.6 10.8 10 12.5 7
6/14/2007 14 7.8 12.3 9.6 8.8 13.1 4.1 11.6 8.6 10.8 9.8 12.5 7.2
7/19/2007 13.9 7.9 12.3 9.5 8.8 13.1 3.8 11.8 8.4 10.6 9.4 12.7 7.4
8/15/2007 14 8 12.3 9.5 8.9 13.1 3.6 11.8 8.3 10.4 9.5 12.6 7.5
9/18/2007 14.2 8 12.3 9.6 8.8 13.1 3.3 11.9 8.3 10.3 9.4 12.6 7.6
10/10/2007 14.1 8.2 12.3 9.8 8.7 13.1 3.5 12.1 8 10.2 9.2 12.8 7.8
11/13/2007 14.3 8.2 12.3 9.7 8.8 13.1 3.3 12 8.2 10.5 9 13.1 8
12/8/2007 14.3 8.3 12.3 93 8.8 13.1 3.1 12.3 8.1 10.5 8.9 13.2 8
1/15/2008 14.3 8.3 12.3 9.7 8.7 13.1 3.3 12.2 8.1 10.4 9.1 13.1 8
2/13/2008 14.2 8.2 12.3 9.6 8.7 13.1 3A 12.2 8.2 10.4 9.1 13.1 7.9
3/18/2008 14.2 8.2 12.3 9.7 8.8 13 3.4 12.1 8.3 10.5 9.2 13.1 8
4/16/2008 14.3 8.3 12.3 9.7 8.8 13 3.5 12.1 8.3 10.6 9.2 13.1 7.9
5/26/2008 14.2 8.3 12.3 9.6 8.7 13.1 3.6 12.2 8.2 10.5 9.3 13 7.8
6/17/2008 14.1 8.2 12.3 9.5 8.7 13.1 3.6 12 8.1 10.4 9.2 13 7.8
7/30/2008 13.3 8.3 12.3 7.6 7.3 13.1 3.1 13(Dry) 8.1 10.1 8 13.6 6.8
8/13/2008 13.4 8.4 12.3 8.1 7.7 13.1 3.3 13(Dry) 8.2 10.3 8.7 13.6 6.5
9/10/2008 13.3 8 12.3 8 7.9 12.1 3.2 12.1 8.3 10.2 8.5 13.3 6
10/21/2008 14.3 8.6 12.3 9.6 9.2 12.7 4.5 11.8 9 11.3 10.6 13 5.5
11/11/2008 14.6 8.6 12.3 10.1 9.2 13.1 5 11.9 8.9 11.6 11 13.4 5.7
12/18/2008 13.9 7.9 12.3 8.4 9.2 11.9 4.9 10 8.5 11.8 11 11.9 4.2
1/1312009 14 7.9 12.3(DRY) 8.9 9.6 12.1 5.1 10.4 8.5 11.8 11.5 11.9 4.4
14.2 8.2 12.3(DRY) 9.3 9.2 12.7 5.2 10.9 8.5 11.7 10.8 12 4.7
14.1 8 12.3(DRY) 9.5 9.7 12.5 5.6 10.3 8.6 11.9 11.2 12 4.5
E 15 8.2 12.3(DRY) 9.1 10.4 13(DRY) 6.8 10.3 9.5 12.4 13.1 12 4.5
5/13/2009 15.4 8.9 12.3(DRY) 11.3 10.8 13(DRY) 6 9 12.3 12.7 12.6 5
15.6 9 12.3(DRY) 11 10.9 13.0(DRY) 5.8 12.4 8.8 12.3 11.5 12.9 5.3
3
Piezometer Reodings.xlsx
Piezometer Elevations
P1 524
P2 513
P3 538
P4 525
P5 513
P6 540
P7 533
P9 540
Plo 532
P31 530.5
owl 527.9
OW2 532
OW3 529
Table 1. Monthly Piezometer and Observation Well Measurements

7/14/2009

15.9

10.1

12.3(DRY)

11.1

9.9

13.0(DRY)

6.6 13.1
(Bottom
wet)

9.8

12

12.2

13.8

6.6

8/11/2009
15.3
10.8
12.3(DRY)
10.8
10
13.0(DRY)
5.6 otto
m wet)
8.8
11.8
11.1
13.9
7.3

9/15/2009
16.7
11
12.3 (DRY) (Bottom
Wet)
11.1
13.0(DRY)
8 (Bottom
wet)
10.5 13.2
(Bottom)
14.1
14.2
7.4

10/30/2009

17.8

10.7

12.3 (DRY) 11.9
(Bottom
Wet)

12.6

13.0 (DRY

9.5
13.1
(DRY)

12
13.2
(Bottom)

14.7

15.3

7.8
11/17/2009 14.8 8.2 12.3 (DRY) 11.8 11 13.0 (DRY 6.6 11.1 10 12 12.5 13.9 5.7
12/172009 14.5 8.1 12.3 (DRY) 10 10.5 12.6 6 10 9.3 11.9 12 12.1 4.5
1/142010 14.7 9.1 12.3 (Dry) 11.3 10.7 13.0 (Dry) 5.5 11.1 8.3 11.9 11.8 12.2 4.9
2232010 14.6 8.9 12.3 (Dry) 9.7 9.7 12.8 6 10.3 8.6 11.9 11.6 11.7 4.3
3232010 14.9 9.1 12.3 (Dry) 11.8 10.2 13.0 (Dry) 7.7 10.8 9 12.9 13.2 11.8 4.7
4202010 15.2 9.6 12.3 (Dry) 11.9 10.9 13.0 (Dry) 7.9 11.5 8.6 13.1 112 12.8 5.4
5/182010 13.8 8.3 12.3 (Dry) 9.8 9.7 13.0 (Dry) 4.2 12.6 8 11.3 10 12.3 5
6222010 13.5 9.1 12.3 (Dry) 8.3 8.3 13.0 (Dry) 4 12 8.2 10.7 8.9 12.5 5
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e ?c.AVA'rl01A AR L k
096600 N
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600 0 600 1000
SCALE IN FEET
OOKC POMIN COMPANY
DAN RIVER STEAM STATION
006000 N
0
* • ° LEGEND ASH BASIN
EXISTING SITE TOPOGFIAPN MONITORING WELL
/ e MONITORING WELL LOCATIONS
• DEEP MONITORING WELL u
Figure 3. Groundwater Contours drawn fr_o_m_ _ April 2009 monitoring well
using linear interpolation-
STORM WATER MANAGEMENT
CALCULATIONS
FOR
DAN RIVER COMBINED CYCLE
PROJECT
EDEN, ROCKINGHAM COUNTY, NC
Jul_ 0 ?5 ?_011
DENR
Revised June 29, 2011
PREPARED BY:
jumpWSP•SELLS
F-0891
128 Overhill Drive, Suite 105
Mooresville, NC 28117
Phone: [phone]
Fax: [phone]
?????INCA t+/
ZQ?
• 30v -
a
I ?wN ,?
•
PROJECT NARRATIVE
The Duke Energy Dan River Steam Station in Eden, Rockingham County, NC will undergo a plant
expansion to include combined cycle combustion turbines. The project will require disturbance of
approximately 90 acres of the 378 acre facility.
Earthwork proposed for the project includes filling a 0.133 acre of wetland area. A 401 permit
(NCDENR DWQ) and 404 permit (US Army Corp. of Engineers) have been submitted.
The enclosed storm water management plan includes the entire plant expansion area which is
comprised of two general drainage areas: Drainage Area #1 and Drainage Area #2. Both drainage
areas will incorporate wet detention basins to treat the first inch of rainfall. The stockpile area
within Drainage Area #3 will be established with vegetation as shown on the erosion and sediment
control plan. There is no impervious area proposed for the stockpile area, and the runoff from this
drainage area discharges into the existing ash basins.
The proposed BMP(s) are denoted as Wet Pond #I and Wet Pond #2 for the Plant Expansion Area.
The BMP(s) are designed in accordance with the North Carolina BMP Manual (2007 edition). The
wet detention basins are designed for 90% TSS removal with a permanent pool minimum average
depth of 3 feet.
The hydrologic calculations include pre and post discharge rates for the 1-yr, 2-yr, 10-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 events. The emergency spillway is sized for the 100-yr
storm event.
Soil testing was performed by S&ME, Inc. (see attached soil test reports). Temporary observation
wells were installed in the general areas of BMP #1 and BMP #2. Based upon the average depths to
groundwater in the test locations, a seasonal high groundwater level was determined for each of the
wet detention ponds. Wet Pond #1 permanent pool elevation is at the SHWT elevation of 526.0.
Wet Pond #2 permanent pool elevation (530.5) is more than 6 inches from the SHWT elevation
(512.0-518.0) and will incorporate a clay liner.
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
0
Permit No.
(ro be P-k1ed byOWO)
•
l?
u
0
.ATA
HCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be Bled out, printed and suWad.
The Required Remy Checklsf (Part 111) must be printed, filed out and submNed obV wlh al offhe required tnlormafan.
WA T?9?G
O ^c
II. PROJECT INFORMATION
rrolea Barg
Contact person
Phone number
Date
Drainage area number
704.662.0100
13-Jun-11
Wet Denterft Pond #1
II. DESIGN INFORMATION
Site Characteristics
Drainage area 208,454 ft2
Impervious area, post-development 56,465 R
% impervious 27.09%
Design rainfall depth 1.0 in
Storage Volume: Non-SA Waters
Minimum volume required 5,1121? OK
Volume provided 11,126 fe OK volume provided is equal to or in excess of volume required.
Storage Volume: SA Waters
1.5' runoff volume
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the prelpost control of the 1 yr 24hr storm peak Dow required?
1-yr, 24-hr rainfall depth
Rational C, pre-development
Rational C, post-development
Rainfall Intensity: 1-yr, 24-hr storm
Pre-development 1-yr, 24-hr peak flow
Post-development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak Dow control
Elevations
Temporary pod elevation
Pem>anent pod elevation
SNWT elevation (approx. at the perm, pod elevation)
Top of 10ft vegetated shelf elevation
Bottom of 10ft 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
Form SW401-Wet Detention Basin-Rev.6.2r OM
fe
fe
fe
0 fe
fe
Y (Y or N)
2.8 in
0.40 (unitiess)
0.45 (unitiess)
4.361n1hr OK
11.79 felsec
0.41 felsec
-11.38 elsec
527.50 fmsl
526.50 tmsl
526.00 fmsl
$27.00 fmsl
526.00 fmsl Data not needed for calculation option 01, but OK if provided.
521.00 fmsl
520.00 fmsl Data not needed for calculation option #1, but OK If provided.
1.00 It
Y (Y or N)
527.5 fmsl OK
Parts 1.1411. Design Summary, Pape 1 or 2
Permit No.
go be pmvtdsd by DWO)
II: DESIGN INFORMATION
Surface Areas
Area, temporary pool 12,178 f?
Area REQUIRED, permanent pod 3,710 fe
SAIDA ratio 1.78 (unkless)
Area PROVIDED, permanent pod, Att, 9,492 ft` OK
Area, bottom of 10ft vegetated shelf, Aw of 7,758 tl`
Area, sediment cleenout, top elevation (bottom of pond), AuLwa 1,947 le
Volumes
Volume, temporary pod 11,126 fts OK
Volume, permanent pod. Vr..r.?-+ 28,540 fts
Volume, forebay (sum of forebays If more than one forebay) 6,274 fO
Forebay % of permanent pod volume 22,0%% OK
SAIDA Table Data
Design TSS removal 90%
Coastal SAIDA Table Used? N (Y or N)
6lountsiniiMmont SAIDA Table Used? Y (Y or N)
SAIDA ratio 1.78 (unNess)
Average depth (used In SAIDA table):
Calculation option 1 used? (See Figure 10.2b) Y (Y or N)
Volume, permanent pod, VF,,jd 28,540 fts OK
Area provided, permanent pod, A.,,3,d 9,492 ft` OK
Average depth calculated 3.01 It OK
Average depth used in SAIDA, d,„ (Round to nearest 0.5ft) 3.0 ft OK
Calculation option 2 used? (See Figure 10.2b) n (Y or N)
Area provided, permanent pod,
fe
Area, bottom of 10ftvegetated shelf, AjLwr
fte
Area, sediment deanout, lop elevation (bottom of pond), AbL;,,j fe
'Depth" (distance bfw bottom of 1Oft shelf and top of sediment) ft
Average depth calculated It
Average depth used in SAIDA. d„, (Round to nearest 0.5ft) It
Drawdown Calculations
Drawdown through orifice? Y (Y or N)
Diameter of orifice (if circular) 1.50 in
Area of orifice (if-non-circular) ire
Coefficient of discharge (Co) 0.60 (unitiess)
Driving head (H,) 0.39 It
Drawdown through weir? N (Y or N)
Weir type (unitiess)
Coefficient of discharge (C„) (unitiess)
Length of weir (L) It
Driving head (H) It
Pre-development I -yr, 24-hr peak flow 11.79felsec OK
Post-development 1-yr, 24-hr peak flow 0.41 felsec OK
Storage volume discharge rate (through discharge orifice or weir) 0.06 fe/sec
Storage volume drawdown time 4.00 days OK draws down in 2-5 days.
Drawdown time varying from expected value by more than a half day.
Additional Information
Vegetated side slopes 3 :1 OK
Vegetated shelf slope 10 :1 OK
Vegetated shelf width 10.0 It OK
Length of flowpath to width ratio 3 :1 OK
Length to width ratio 2.0 :1 OK
Trash rack for overflow & orifice? Y (Y or N) OK
Freeboard provided 1.0 It OK
Vegetated titer provided? N (Y or N) OK
Recorded drainage easement provided? Y (Y or N) OK
Cepures all runoff at ultimate build-out? Y (Y or N) OK
Drain mechanism for maintenance or emergencies 8' DIP
Form SW401-Wat Detention Basin-Rev.e-2r20109 Parts 1.3 H. Design Summary, Page 2 of 2
Permit No.
(to be provided by DWQ)
. QL REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
In Is Sheet No.
C-7.0 1. Plans (1' - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off site drainage Of applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Basin dimensions,
• Pretreatment system,
- High flow bypass system,
Maintenance access,
- Proposed drainage easement and public right of way (ROW),
Overflow device, and
Boundaries of drainage easement.
C if L? C-7.1 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
- Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
C-7.1 3. Section view of the wet detention basin (1' = 20' or larger) showing:
Side slopes, 3:1 or lower,
Pretreatment and treatment areas, and
• Inlet and outlet structures.
C-7.0 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
calculations 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
to verify volume provided.
C-7.0 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
CACZA 7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required).
iarrua^wau. 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
5A N fr soli maps are not an acceptable source of soils information.
.)
0 13 "- 0 SO OM+IA4
Form SW401-Wet Detention Basin-Rev.6-2120/09 Part III. Required Items Checklist, Page 1 of 1
C?
RAINFALL DATA
•
0
Precipitation Frequency Data Server Page 1 of 3
POINT PRECIPITATION
FREQUENCY ESTIMATES r E
. FROM NOAA ATLAS 14 EDEN, NORTH CAROLINA (31-2631) 36.4742 N 79.7433 W 498 feet
from 'Predpiudon-Frequency Ades Mdre United SUW NOAA Ades 14, Volume 2, Version 3
G.M. aaude. MIN fanirr, a. Lin, T. ParaybA MYckta, and A. Riley
NOAH, Nationd Weather Service, Silver Spies, Maryland, 2004
Extitued: Wed Jun 24 2009
Confidence Limits Seasonality Location Maps Other Info. GIS data Maps Does Return to State Map
E
C7
Precipitation Frequency Estimates (incites)
ART" 5 10 15 X F-i-21 10

-]k
min m tl HE )!X 3 8
( errs MIA Min !1114
Fil

®® .

1 --j Ltd 147 159 1.96 2.37 2.81 3.30 3.68 4.22 4.77 6.43
0.36 10 .58 0.72 0.99
i 2 ,43 0.69 0.87 1.20 1.51 1.79 1.93 2.38 2.87 3.40 3.99 4.45 5.71 .66
7.46 L0.02 11.98
9.41 11.82 14.06
0.51 0582 1.04 1.47 1.89 2.25 2.44 2,99 3.64 4.33 ®5.61 6.29 7.01 9.21 11,09 13.76 16.1d
10 0.57 .9t 1.15 1.66 2,17 2.61 2.82 3.48 4.26 5.10 5.90 .57 7.30 8.06 10.44 12.37 15.23 17.74
0 .63 1.01 1.28 1.89 2 52 3.08 3.33 4.15 5.16 .22 7.12 .92 8.72 9.54 12.11 14.04 17.11 19.75
50 0.68 1.07 1.36 2,05 2.78 3.44 3.72 4.70 5.89 7.17 8.14 9.05 9.89 10.74 13.42 15.32 18.52 21.23
100 0.72 114 1.44 2.20 3.03 3.82 4.13 5.27 6.70 8.21 9.22 10.25 11.13 11.99 14.76 16.56 19.87 22.b4
200 0.75 1.14 1.50 2.34 3.28 4.19 4.53 5.86 7.55 9.34 10.38 11.54 12.46 13.30 16.11 17.78 21.i7 23.98
500 .79 1.25 1.58 2.51 3.60 4.69 5,07 .70 8.80 11.00 12.07 13.39 14.35 15.15 17.95 19,38 22.85 25.67
1000 .82 1.24 1.62 2.63 3.84 5,08 5.48 7.36 4.82 12.41 13.46 14.93 15.89 16.63 19.37 20.57 24.08 26.89
These prs*h5onfrequency rAgWAsarebased ona ARIIsftAiwapaRecurrencefnlerval.
Please refer la NOM Afas 14 Dwrent for more Wormston. NOTE Fwn&rp farces esWAS near zero to appear as zero.
TM upper bound of du cWderee interval at 90%conf4ence level Is the value wtkth A of the sWd&d qu&,Ve values for a given kequency are greater than.
"These prectpletion kequency eig-Mes are based on a o"al duration seder. A ! Is the kwape Recurrence Interval.
Pease refer to NOM Me& 14 Doemnt for more tnfmna%n. ME, Formatting prevents esrma es near zero to appear as zero
* Upper bound of the 90% confidence Interval
Precipitation Frequency Estimates (inches)
ARI** 5 10 15 30 60 120 3 6 12 24 48 4 7 10 20 30 45 60
(ytals) min min min min min min hr hr hr hr hr [dsyj der der der day day 11 der
0 0.40 0.63 0.79 1,09 1.35 1.61 1.73 2.15 2.59 3.04 3.SS 3.97 4.51 S. t0 6.83 8.42 10.60 12.61
=E160 76 0.93 1.31 1.b5 1.46 2.IL 2.61 3.14 3.67 4.30 d.80 3.42 .10 8.16 9.96 12.514.81
0.56 .90 1.14 1.61 2.07 2,46 2.66 3.28 3,96 4.66 3.41 6.05 6.72 7.48 9.81 11.73 14.34 17.01
10 0.62 0.99 1.25 1.81 2.36 2.84 3.07 3.80 G2 3.48 .32 7,06 7.78 8,60 11.11 13,07 16.07 18.67
25 0.69 1.09 1.34 2.06 2.74 3,35 3,62 4.52 3.57 6.68 7.63 8.51 9.28 10.16 12.89 14.85 18.06 20.77
50 .73 1.17 1.48 2,23 3.02 3.74 4.04 8.11 6.36 7.69 8.71 9.72 1110.543 14.30 16.19 19,Sb 22.34
100 0,78 1.2d 1.56 2.d0 3.30 4.15 4.47 3.72 7.20 8.80 9.88 11.02 11.87 12.79 15.73 17.52 21.01 23.83
200 0.-8-21f, 30 1.64 2.35 3.58 4.55 4.40 .36 8.10 10.01 11.14 12,43 13.30 14.21 17.20 18.84 22.42 25.27
500 0.86 1.37 1.72 2.74 3.931F5 10 5.49 7.27 9.45 11.80 13.00 14,46 no 16.23 19.21 20.59 24.24 27.11
1000 0.90 1.41 1.77 2,87 4.19 5.33 3.93 7.99 10.55 13.34 14.55 16.16 17.08 17.88 20.79 21.93 25.61 28.46
* Louver bound of the 90% confidence interval
Precipitation Frequency Estimates (inches)
10 20 30 4S 60
ART** [-5 3 10 15 30 60 [X120 12 48 Fy
ears min min min hr lir hr hr hr day d
er dy 11 der der day I
10.33 0.53 0.66 0.91 1.13 1.33 1.46 1.802.18 2,61 3.08 3.43 6 4.48 6,05 7.54 9.48 11.39
i 10.40 0.63 0.80 1.10 1.38 1.64 1.78 2.19 2.64 3.16 3.72 4.15 4. 3.975 5.37 7.21 8.91 11.18 13.37
0.47 0.75 0.95 1.35 1.73 2.06 2.24 2.74 3.33 4.02 4.70 5.23 5.89 6.58 8.66 10.49 13,01 15.36
10 0.52 0.83 1.05 1,52 1.98 2.38 2.58 3.18 3,88 4.72 5.48 6.10 .82 7.55 9.79 11.68 14.38 16.84
25 0.57 0.92 1.16 1.72 2.29 2.80 3,03 3.76 4.66 5.73 6.39 7.33 8.11 8.89 11.32 13.23 16.13 1$.71
SO 0.61 0.97 1.23 1.85 2.51 3.12 3.38 4.22 5.29 6.56 7.44 $.32 9.15 9,97 12.51 14.39 17.4-21F20-061
100 0.65 1.02 1.30 1.99 2.73 3.43 3.72 4.70 5.94 7.45 8.43 9.37 10.23 11,08 13.70 15.52 18.64 21.36
200 0.68 1.07 1.35 2.10 2.95 3.74 4.05 5.17 6.62 8.41 .42 10.46 11.34 12.21 14.88 16.62 19.81 22.57
500 0.71 1.12 1.41 2.24 3.21 4.14 4.4E 5.82 7.56 .77 10.83 12.02 12.96 13.79 16.44 18.00 1.29 24.07
1000 0.73 1.14 1.44 2,33 3.39 4.44 4.80 6.30 8.30 10.89 11.96 13.27 14.24 15.02 1?.64 19.03 22.35 25.13
IN lower bound of INcon5daneintervatat90%contder"level Isthevalue vUh5%ofthe smAazedqua evaluesfor a9%enkeVwyarelassdran.
littw/Mitnier nwc nnaa env/r•.oi-hin/hrlcr./hnilftnnt nerl?tvn?=nfRrnnit?=ncRr erie?=nflRrctate 6/24/20119
NCDENR Stormwater BMP Manual Chapter Revised 09-28-07
0 Table 10-1
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 85 Percent TSS
Pollutant Removal Efficiency hi the Mountain and Piedmont Reeions, Adapted from Driscoll, 1986
Percent
Impervious
Cover

3.0

4.0 Permanent Pool Average Depth (ft)

5.0 6.0 7.0

8.0

9.0
10% 0.59 0.49 0.43 0.35 0.31 0.29 0.26
20% 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30% 1.34 1.08 0.97 0.83 0.70 0.64 0.62
40% 1.73 1.43 1.25 1.05 0.90 0.82 0.77
50% 2.06 1.73 1.50 1.30 1.09 1.00 0.92
60% 2.40 2.03 1.71 1.51 1.29 1.18 1.10
70% 2.88 2.40 2.07 159 1.54 1.35 1.26
80% 3.36 2.78 2.38 2.10 1.86 1.60 1.42
90% 3.74 3.10 2.66 2.34 2.11 1.83 1.67
Table 10-2
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 85 Percent TSS
Pollutant Removal 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% 0.9 0.8 0.7 0.6 0.5 0 0 0 0 0
20% 1.7 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5
30% 2.5 2.2 1.9 1.8 1.6 1.5 1.3 1.2 1.0 0.9
40% 3.4 3.0 2.6 2.4 2.1 1.9 1.6 1.4 1.1 1.0
50% 4.2 3.7 3.3 3.0 2.7 2.4 2.1 1.8 1.5 1.3
60% 5.0 4.5 3.8 3.5 3.2 2.9 2.6 2.3 2.0 1.6
70% 6.0 5.2 4.5 4.1 3.7 3.3a 2.9 2.5 2.1 1.8
80% 6.8 6.0 5.2 4.7 4.2 3.7 3.2 2.7 2.2 2.0
90% 7.5 6.5 5.8 5.3 4.8 4.3 3.8 3.3 2.8 1.3
100% 8.2 7.4 6.8 6.2 5.6 5.0 4.4 3.8 3.2 2.6
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 Piedtuout 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
Wet Detention Basin 10-9 July 2007
•
C7
WET DETENTION POND #1
CALCULTIONS
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WET POND 1
PRE
area 11.14 ac.
CN 79
tc 22.4 min.
RUNOFF
CFS VOLUME
AC-FT
1-Y 11.79 0.976
10-Y 33.47 2.681
25-Y 44.83 3.599
50-Y 54.61 4.400
100-Y 65.39 5.295
POST
area 4.79 ac.
CN 80
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 9.82 0.443 0.41 0.431 0.958 527.54
10 Y 25.91 1.190 15.83 1.178 1.134 528.14
25-Y 34.15 1.589 24.93 1.577 1.204 528.37
50-Y 41.18 1.937 31.93 1.924 1.253 528.52
100-Y 48.89 2.324 38.73 2.312 1.299 528.66
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40
•
•
DA1\
Pre
•
Su4 Reach on, Llnk
Pond-1-Pre
• Prepared by WSP SELLS Printed 6/16/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 2
Area Listing (all nodes)
Area CN Description
(acres) (subcatchment-numbers)
8.890 74 >75% Grass cover, Good, HSG C (DA1)
2.250 98 Paved parking, HSG C (DA1)
11.140 TOTAL AREA
•
0
Pond-1-Pre
Prepared by WSP SELLS Printed 6/16/2011
is HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 3
Soil Listing (all nodes)
Area Soil Subcatchment
(acres) Goup Numbers
0.000 HSG A
0.000 HSG B
11.140 HSG C DA1
0.000 HSG D
0.000 Other
11.140 TOTAL AREA
•
0
Pond_i Pre Type 1124-hr Eden 1 year Rainfall=2.81 "
Prepared by WSP SELLS Printed 6/16/2011
HydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Paae 4
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Pre Runoff Area=11.140 ac 20.20% Impervious Runoff Depth= 1.05"
Flow Length=414" Tc=22.4 min CN=79 Runoff=11.79 cfs 0.976 of
Total Runoff Area =11.140 ac Runoff Volume = 0.976 of Average Runoff Depth =1.05"
79.80% Pervious in 8.890 ac 20.20% Impervious = 2.250 ac
0
0
Pond-1-Pre Type 1124-hr Eden 9 year Rainfall=2.89"
Prepared by WSP SELLS Printed 6/16/2011
. HydroCAD® 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment DA1: Pre
Runoff = 11.79 cfs @ 12.17 hrs, Volume= 0.976 af, Depth= 1.05"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 1 year Rainfall=2.81"
Area (ac) CN Descriotion
2.250 98 Paved parking, HSG C
8.890 74 >75% Grass cover, Good, HSG C
11.140 79 Weighted Average
8.890 79.80% Pervious Area
2.250 20.20% Impervious Area
Tc Length Slope Velocity Capacity Description
21.8 249 0.0400 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.40"
0.6 165 0.0900 4.83 Shallow Concentrated Flow,
Unpaved Kv=16.1 fas
22.4 414 Total
Subcatchment DA1: Pre
Hydrograph
13-
12= ?.s aType 1124-hr Eden
1 year
9: Rainfall=2.81"
8. Runoff Area=11.140 ac
7- Runoff Volume =0.976 of
e: Runoff Depth=1.05"
5= Flow Length=414'
4? Tc=22.4 min
3: CN=79
0 5 10 1,5 20 25 30 35 40 45 50 55 80 85 70 75 80 85 90 95 100 105 110 115 120
Time (hours)
Runo%

Pond _1_Pro Type 1124-hr Eden 9 year Rainfall=2.89"
Prepared by WSP SELLS Printed 6/16/2011
HydroCADV 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Pace 6
Hydrograph for Subcatchment DA1: Pre
11
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.05 0.00 0.00
3.00 0.10 0.00 0.00
4.50 0.16 0.00 0.00
6.00 0.22 0.00 0.00
7.50 0.31 0.00 0.00
9.00 0.41 0.00 0.00
10.50 0.57 0.00 0.01
12.00 1.86 0.44 6.37
13.50 2.25 0.67 1.12
15.00 2.40 0.77 0.67
16.50 2.50 0.84 0.48
18.00 2.59 0.90 0.40
19.50 2.66 0.94 0.33
21.00 2.71 0.98 0.28
22.50 2.76 1.02 0.26
24.00 2.81 1.05 0.25
25.50 2.81 1.05 0.00
27.00 2.81 1.05 0.00
28.50 2.81 1.05 0.00
30.00 2.81 1.05 0.00
31.50 2.81 1.05 0.00
33.00 2.81 1.05 0.00
34.50 2.81 1.05 0.00
36.00 2.81 1.05 0.00
37.50 2.81 1.05 0.00
39.00 2.81 1.05 0.00
40.50 2.81 1.05 0.00
42.00 2.81 1.05 0.00
43.50 2.81 1.05 0.00
45.00 2.81 1.05 0.00
46.50 2.81 1.05 0.00
48.00 2.81 1.05 0.00
49.50 2.81 1.05 0.00
51.00 2.81 1.05 0.00
52.50 2.81 1.05 0.00
54.00 2.81 1.05 0.00
55.50 2.81 1.05 0.00
57.00 2.81 1.05 0.00
58.50 2.81 1.05 0.00
60.00 2.81 1.05 0.00
61.50 2.81 1.05 0.00
63.00 2.81 1.05 0.00
64.50 2.81 1.05 0.00
66.00 2.81 1.05 0.00
67.50 2.81 1.05 0.00
69.00 2.81 1.05 0.00
70.50 2.81 1.05 0.00
72.00 2.81 1.05 0.00
73.50 2.81 1.05 0.00
75.00 2.81 1.05 0.00
76.50 2.81 1.05 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfq
78.00 2.81 1.05 0.00
79.50 2.81 1.05 0.00
81.00 2.81 1.05 0.00
82.50 2.81 1.05 0.00
84.00 2.81 1.05 0.00
85.50 2.81 1.05 0.00
87.00 2.81 1.05 0.00
88.50 2.81 1.05 0.00
90.00 2.81 1.05 0.00
91.50 2.81 1.05 0.00
93.00 2.81 1.05 0.00
94.50 2.81 1.05 0.00
96.00 2.81 1.05 0.00
97.50 2.81 1.05 0.00
99.00 2.81 1.05 0.00
100.50 2.81 1.05 0.00
102.00 2.81 1.05 0.00
103.50 2.81 1.05 0.00
105.00 2.81 1.05 0.00
106.50 2.81 1.05 0.00
108.00 2.81 1.05 0.00
109.50 2.81 1.05 0.00
111.00 2.81 1.05 0.00
112.50 2.81 1.05 0.00
114.00 2.81 1.05 0.00
115.50 2.81 1.05 0.00
117.00 2.81 1.05 0.00
118.50 2.81 1.05 0.00
120.00 2.81 1.05 0.00
Pond _1_Pro Type 1124-hr Eden 90 year Rainfall=5.90"
Prepared by WSP SELLS Printed 6/16/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Pace 7
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Pre Runoff Area=11.140 ac 20.20% Impervious Runoff Depth=2.89"
Flow Length=414' Tc=22.4 min CN=79 Runoff=33.47 cfs 2.681 of
Total Runoff Area =11.140 ac Runoff Volume = 2.681 of Average Runoff Depth = 2.89"
79.80% Pervious = 8.890 ac 20.20% Impervious = 2.260 ac
?J
0
•
Pond-
B Type /124-hr Eden 10 year Rainfall=5.10"
WSP SELLS Printed 6/16/2011
00 s/n 04719 0 2009 HvdroCAD Software Solutions LLC Paae 8
Summary for Subcatchment DA1: Pre
Runoff =
33.47 cfs @ 12.15 hrs, Volume= 2.681 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 10 year Rainfall=5.10"
Area (ac) CN Description
2.250 98 Paved parking, HSG C
8.890 74 >75% Grass cover, Good, HSG C
11.140 79 Weighted Average
8.890 79.80% Pervious Area
2.250 20.20% Impervious Area
Tc Length
Description

21.8 249 0.0400 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.40"
0.6 165 0.0900 4.83 Shallow Concentrated Flow,
Unpaved Kv=16.1 fos
22.4 414 Total
Subcatchment DA1: Pre
Hydrograph
Runoff
Type II 24-hr Eden
20
1a
16
14
12
10
0
Time (hours)
10 year
Rainfall=5.10"
Runoff Area=11.140 ac
Runoff Volume=2.681 of
Runoff Depth i-2.89"
FloW Length=414'
76=22.4 min
CN=79
75 80 85 90 95 100 105 110 1
•
Pond _1_Pre Type 1124-hr Eden 10 year Rainfall=5.10"
Prepared by WSP SELLS Printed 6/16/2011
• HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 9
Hydrograph for Subcatchment DA1: Pre
•
171
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.08 0.00 0.00
3.00 0.18 0.00 0.00
4.50 0.28 0.00 0.00
6.00 0.41 0.00 0.00
7.50 0.56 0.00 0.00
9.00 0.75 0.02 0.19
10.50 1.04 0.08 0.65
12.00 3.38 1.47 20.57
13.50 4.07 2.02 2.66
15.00 4.35 2.25 1.54
16.50 4.55 2.41 1.09
18.00 4.70 2.54 0.92
19.50 4.82 2.65 0.74
21.00 4.92 2.73 0.62
22.50 5.01 2.81 0.59
24.00 6.10 2.89 0.55
25.50 5.10 2.89 0.00
27.00 5.10 2.89 0.00
28.50 5.10 2.89 0.00
30.00 5.10 2.89 0.00
31.50 5.10 2.89 0.00
33.00 5.10 2.89 0.00
34.50 5.10 2.89 0.00
36.00 5.10 2.89 0.00
37.50 5.10 2.89 0.00
39.00 5.10 2.89 0.00
40.50 5.10 2.89 0.00
42.00 5.10 2.89 0.00
43.50 5.10 2.89 0.00
45.00 5.10 2.89 0.00
46.50 5.10 2.89 0.00
48.00 5.10 2.89 0.00
49.50 5.10 2.89 0.00
51.00 5.10 2.89 0.00
52.50 5.10 2.89 0.00
54.00 5.10 2.89 0.00
55.50 5.10 2.89 0.00
57.00 5.10 2.89 0.00
58.50 5.10 2.89 0.00
60.00 5.10 2.89 0.00
61.50 5.10 2.89 0.00
63.00 5.10 2.89 0.00
64.50 5.10 2.89 0.00
66.00 5.10 2.89 0.00
67.50 5.10 2.89 0.00
69.00 5.10 2.89 0.00
70.50 5.10 2.89 0.00
72.00 5.10 2.89 0.00
73.50 5.10 2.89 0.00
75.00 5.10 2.89 0.00
76.50 5.10 2.89 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 5.10 2.89 0.00
79.50 5.10 2.89 0.00
81.00 5.10 2.89 0.00
82.50 5.10 2.89 0.00
84.00 5.10 2.89 0.00
85.50 5.10 2.89 0.00
87.00 5.10 2.89 0.00
88.50 5.10 2.89 0.00
90.00 5.10 2.89 0.00
91.50 5.10 2.89 0.00
93.00 5.10 2.89 0.00
94.50 5.10 2.89 0.00
96.00 5.10 2.89 0.00
97.50 5.10 2.89 0.00
99.00 5.10 2.89 0.00
100.50 5.10 2.89 0.00
102.00 5.10 2.89 0.00
103.50 5.10 2.89 0.00
105.00 5.10 2.89 0.00
106.50 5.10 2.89 0.00
108.00 5.10 2.89 0.00
109.50 5.10 2.89 0.00
111.00 5.10 2.89 0.00
112.50 5.10 2.89 0.00
114.00 5.10 2.89 0.00
115.50 5.10 2.89 0.00
117.00 5.10 2.89 0.00
118.50 5.10 2.89 0.00
120.00 5.10 2.89 0.00
Pond _1_Pro Type 1124-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/16/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 10
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Pre Runoff Area=11.140 ac 20.20% Impervious Runoff Depth=3.88"
Flow Length=414" Tc=22.4 min CN=79 Runoff=44.83 cfs 3.599 of
Total Runoff Area =11.140 ac Runoff Volume = 3.599 of Average Runoff Depth = 3.88"
79.80% Pervious = 8.890 ac 20.20% Impervious = 2.250 ac
U
0
Pond-1-Pre Type ll 24-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/16/2011
. HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 11
•
Summary for Subcatchment DA1: Pre
Runoff = 44.83 cfs @ 12.15 hrs, Volume= 3.599 af, Depth= 3.88"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 25 year Rainfall=6.22"
Area (ac) CN Description
2.250 98 Paved parking, HSG C
8.890 74 >75% Grass cover, Good, HSG C
11.140 79 Weighted Average
8.890 79.80% Pervious Area
2.250 20.20% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
21.8 249 0.0400 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.40"
0.6 165 0.0900 4.83 Shallow Concentrated Flow,
Unpaved Kv=16.1 fps
22.4 414 Total
Subcatchment DA1: Pre
Hydrograph
50
48 -
Runoff
48-
44

:
•

: 44ssa.

Type II 24-hr-Eden
42
40
25 year
38
-
3
1
Rainfall=6
22"
4
34
321 .
Runoff Area=11.140 ac
28-
26--
Runoff Volume=3.599 of
M 24_
Ii 22- , Runoff Depth-3.88"
20
1a-
;
Flow `Length=414'
18-
14-
Tc=22.4 min
12-
'R .
CN=79
0
35 40 45 50
Time (hours)
110 115 1
0
Pond-1-Pre Type// 24-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/16/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 12
Hydrograph for Subcatchment DA1: Pre
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.10 0.00 0.00
3.00 0.21 0.00 0.00
4.50 0.34 0.00 0.00
6.00 0.50 0.00 0.00
7.50 0.68 0.01 0.10
9.00 0.91 0.05 0.41
10.50 1.27 0.16 1.07
12.00 4.12 2.06 28.26
13.50 4.97 2.78 3.42
15.00 5.31 3.07 1.97
16.50 5.54 3.27 1,39
18.00 5.73 3.44 1.17
19.50 5.88 3.57 0.94
21.00 6.00 3.68 0.79
22.50 6.11 3.78 0.75
24.00 6.22 3.88 0.70
25.50 6.22 3.88 0.00
27.00 6.22 3.88 0.00
28.50 6.22 3.88 0.00
30.00 6.22 3.88 0.00
31.50 6.22 3.88 0.00
33.00 6.22 3.88 0.00
34.50 6.22 3.88 0.00
36.00 6.22 3.88 0.00
37.50 6.22 3.88 0.00
39.00 6.22 3.88 0.00
40.50 6.22 3.88 0.00
42.00 6.22 3.88 0.00
43.50 6.22 3.88 0.00
45.00 6.22 3.88 0.00
46.50 6.22 3.88 0.00
48.00 6.22 3.88 0.00
49.50 6.22 3.88 0.00
51.00 6.22 3.88 0.00
52.50 6.22 3.88 0.00
54.00 6.22 3.88 0.00
55.50 6.22 3.88 0.00
57.00 6.22 3.88 0.00
58.50 6.22 3.88 0.00
60.00 6.22 3.88 0.00
61.50 6.22 3.88 0.00
63.00 6.22 3.88 0.00
64.50 6.22 3.88 0.00
66.00 6.22 3.88 0.00
67.50 6.22 3.88 0.00
69.00 6.22 3.88 0.00
70.50 6.22 3.88 0.00
72.00 6.22 3.88 0.00
73.50 6.22 3.88 0.00
75.00 6,22 3.88 0.00
76.50 6.22 3.88 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 6.22 3.88 0.00
79.50 6.22 3.88 0.00
81.00 6.22 3.88 0.00
82.50 6.22 3.88 0.00
84.00 6.22 3.88 0.00
85.50 6.22 3.88 0.00
87.00 6.22 3.88 0.00
88.50 6.22 3.88 0.00
90.00 6.22 3.88 0.00
91.50 6.22 3.88 0.00
93.00 6.22 3.88 0.00
94.50 6.22 3.88 0.00
96.00 6.22 3.88 0.00
97.50 6.22 3.88 0.00
99.00 6.22 3.88 0.00
100.50 6.22 3.88 0.00
102.00 6.22 3.88 0.00
103.50 6.22 3.88 0.00
105.00 6.22 3.88 0.00
106.50 6.22 3.88 0.00
108.00 6.22 3.88 0.00
109.50 6.22 3.88 0.00
111.00 6.22 3.88 0.00
112.50 6.22 3.88 0.00
114.00 6.22 3.88 0.00
115.50 6.22 3.88 0.00
117.00 6.22 3.88 0.00
118.50 6.22 3.88 0.00
120.00 6.22 3.88 0.00
Pond _1_Pro Type 1124-hr Eden 50 year Rainfall=7.17"
Prepared by WSP SELLS Printed 6/16/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 13
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Pre Runoff Area=11.140 ac 20.20% Impervious Runoff Depth=4.74"
Flow Length=414' Tc=22.4 min CN=79 Runoff=54.61 cfs 4.400 of
Total Runoff Area =11.140 ac Runoff Volume = 4.400 of Average Runoff Depth = 4.74"
79.80% Pervious = 8.890 ac 20.20% Impervious = 2.260 ac
•
U
•
Pond-1-Pre
Prepared by WSP SELLS
HvdroCAD® 9.00 s/n 04719 0 2009
Type 1124-hr Eden 50 year Rainfall= 7.17"
Printed 6/16/2011
roCAD Software Solutions LLC
Summary for Subcatchment DA1: Pre
Runoff = 54.61 cfs @ 12.15 hrs, Volume= 4.400 af, Depth= 4.74"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 50 year Rainfall=7.17'
Area (ac) CN Description
2.250 98 Paved parking, HSG C
8.890 74 >75% Grass cover, Good, HSG C
11.140 79 Weighted Average
8.890 79.80% Pervious Area
2.250 20.20% Impervious Area
Tc Length Slope Velocity Capacity Description
•
Subcatchment DA1: Pre
Hydrograph
Runoff
21.8 249 0.0400 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.40"
0.6 165 0.0900 4.83 Shallow Concentrated Flow,
Unsaved Kv=16.1 fas
22.4 414 Total
50-
45-
40-
36-
30-
25-
20-
15:
1o-
5-
0-
0
Type II 24-hr Eden
50 year
Rainfall=7.17"
Runoff Area=11.140 ac
Runoff Volume-4.400 of
Runoff Depth=4.74"
Flow-Length=414'
Tc=22.4 min
CN-79
55 80 85 70 75 80 85 90 95 100 105 110 1
Time (hours)
lr?
u
Pond 1 Pre Type// 24-hr Eden 50 year Rainfall=7.17"
Prepared by WSP SELLS Printed 6/16/2011
. HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 15
Hydrograph for Subcatchment DA1: Pre
.7
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.12 0.00 0.00
3.00 0.25 0.00 0.00
4.50 0.40 0.00 0.00
6.00 0.57 0.00 0.01
7.50 0.78 0.02 0.22
9.00 1.05 0.09 0.62
10.50 1.46 0.24 1.47
12.00 4.75 2.59 34.94
13.50 5.73 3.44 4.07
15.00 6.12 3.79 2.34
16.50 6.39 4.03 1.65
18.00 6.60 4.22 1.38
19.50 6.78 4.38 1.11
21.00 6.92 4.51 0.93
22.50 7.05 4.63 0.88
24.00 7.17 4.74 0.83
25.50 7.17 4.74 0.00
27.00 7.17 4.74 0.00
28.50 7.17 4.74 0.00
30.00 7.17 4.74 0.00
31.50 7.17 4.74 0.00
33.00 7.17 4.74 0.00
34.50 7.17 4.74 0.00
36.00 7.17 4.74 0.00
37.50 7.17 4.74 0.00
39.00 7.17 4.74 0.00
40.50 7.17 4.74 0.00
42.00 7.17 4.74 0.00
43.50 7.17 4.74 0.00
45.00 7.17 4.74 0.00
46.50 7.17 4.74 0.00
48.00 7.17 4.74 0.00
49.50 7.17 4.74 0.00
51.00 7.17 4.74 0.00
52.50 7.17 4.74 0.00
54.00 7.17 4.74 0.00
55.50 7.17 4.74 0.00
57.00 7.17 4.74 0.00
58.50 7.17 4.74 0.00
60.00 7.17 4.74 0.00
61.50 7.17 4.74 0.00
63.00 7.17 4.74 0.00
64.50 7.17 4.74 0.00
66.00 7.17 4.74 0.00
67.50 7.17 4.74 0.00
69.00 7.17 4.74 0.00
70.50 7.17 4.74 0.00
72.00 7.17 4.74 0.00
73.50 7.17 4.74 0.00
75.00 7.17 4.74 0.00
76.50 7.17 4.74 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 7.17 4.74 0.00
79.50 7.17 4.74 0.00
81.00 7.17 4.74 0.00
82.50 7.17 4.74 0.00
84.00 7.17 4.74 0.00
85.50 7.17 4.74 0.00
87.00 7.17 4.74 0.00
88.50 7.17 4.74 0.00
90.00 7.17 4.74 0.00
91.50 7.17 4.74 0.00
93.00 7.17 4.74 0.00
94.50 7.17 4.74 0.00
96.00 7.17 4.74 0.00
97.50 7.17 4.74 0.00
99.00 7.17 4.74 0.00
100.50 7.17 4.74 0.00
102.00 7.17 4.74 0.00
103.50 7.17 4.74 0.00
105.00 7.17 4.74 0.00
106.50 7.17 4.74 0.00
108.00 7.17 4.74 0.00
109.50 7.17 4.74 0.00
111.00 7.17 4.74 0.00
112.50 7.17 4.74 0.00
114.00 7.17 4.74 0.00
115.50 7.17 4.74 0.00
117.00 7.17 4.74 0.00
118.50 7.17 4.74 0.00
120.00 7.17 4.74 0.00
Pond-1-Pre Type 1124-hr Eden 100 year Rainfall=8.21"
Prepared by WSP SELLS Printed 6/16/2011
• ydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 16
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Pre Runoff Area=11.140 ac 20.20% Impervious Runoff Depth=5.70"
Flow Length=414' Tc=22.4 min CN=79 Runoff=65.39 cfs 5.295 of
Total Runoff Area =11.140 ac Runoff Volume = 6.295 of Average Runoff Depth = 5.70"
79.80% Pervious = 8.890 ac 20.20% Impervious = 2.250 ac
is
0
•
Pond I Pro
Prepare_d by WSP SELLS
HvdroCAD0 9.00 sM 04719 02009
Software Solutions LLC
Summary for Subcatchment DA1: Pre
Runoff - 65.39 cfs @ 12.15 hrs, Volume= 5.295 af, Depth= 5.70"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 100 year Rainfall=8.21"
Area (ac) CN Description
2.250 98 Paved parking, HSG C
8.890 74 >75% Grass cover, Good, HSG C
11.140 79 Weighted Average
8.890 79.80% Pervious Area
2.250 20.20% Impervious Area
Tc Length Slope Velocity Capacity Description
•
Subcatchment DA1: Pre
Type 11 24-hr Eden 900 year Rainfall=8.21"
Printed 6/16/2011
Hydrograph
?3 Runof(
21.8 249 0.0400 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.40"
0.6 165 0.0900 4.83 Shallow Concentrated Flow,
Unpaved Kv=16.1 fps
22.4 414 Total
65- a Type 1124,hr Eden 100 year
60! Rainfall=8.21"
55 Runoff Area=11.140 ac
50-
45- Runoff Volume=5.295 of
. 40. Runoff Depth=5;70"
1 35' Flow Length=414'
30- Tc=22.4 min
25= CN=79
0 5
Time (hours)
80 85
110 115 1
0
•
Pond-1-Pre
Prepared by WSP SELLS
Type H 24-hr Eden 900 year Rainfall=8.29"
Printed 6/16/2011
Hydrograph for Subcatchment DA1: Pre
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.13 0.00 0.00
3.00 0.28 0.00 0.00
4.50 0.45 0.00 0.00
6.00 0.66 0.01 0.09
7.50 0.90 0.04 0.37
9.00 1.21 0.14 0.87
10.50 1.67 0.34 1.92
12.00 5.44 3.19 42.35
13.50 6.56 4.18 4.77
15.00 7.01 4.59 2.73
16.50 7.32 4.88 1.93
18.00 7.56 5.10 1.61
19.50 7.76 5.28 1.29
21.00 7.92 5.43 1.09
22.50 8.07 5.57 1.02
24.00 8.21 5.70 0.96
25.50 8.21 5.70 0.00
27.00 8.21 5.70 0.00
28.50 8.21 5.70 0.00
30.00 8.21 5.70 0.00
31.50 8.21 5.70 0.00
33.00 8.21 5.70 0.00
34.50 8.21 5.70 0.00
36.00 8.21 5.70 0.00
37.50 8.21 5.70 0.00
39.00 8.21 5.70 0.00
40.50 8.21 5.70 0.00
4100 8.21 5.70 0.00
43.50 8.21 5.70 0.00
45.00 8.21 5.70 0.00
46.50 8.21 5.70 0.00
48.00 8.21 5.70 0.00
49.50 8.21 5.70 0.00
51.00 8.21 5.70 0.00
52.50 8.21 5.70 0.00
54.00 8.21 5.70 0.00
55.50 8.21 5.70 0.00
57.00 8.21 5.70 0.00
58.50 8.21 5.70 0.00
60.00 8.21 5.70 0.00
61.50 8.21 5.70 0.00
63.00 8.21 5.70 0.00
64.50 8.21 5.70 0.00
66.00 8.21 5.70 0.00
67.50 8.21 5.70 0.00
69.00 8.21 5.70 0.00
70.50 8.21 5.70 0.00
72.00 8.21 5.70 0.00
73.50 8.21 5.70 0.00
75.00 8.21 5.70 0.00
76.50 8.21 5.70 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 8.21 5.70 0.00
79.50 8.21 5.70 0.00
81.00 8.21 5.70 0.00
82.50 8.21 5.70 0.00
84.00 8.21 5.70 0.00
85.50 8.21 5.70 0.00
87.00 8.21 5.70 0.00
88.50 8.21 5.70 0.00
90.00 8.21 5.70 0.00
91.50 8.21 5.70 0.00
93.00 8.21 5.70 0.00
94.50 8.21 5.70 0.00
96.00 8.21 5.70 0.00
97.50 8.21 5.70 0.00
99.00 8.21 5.70 0.00
100.50 8.21 5.70 0.00
102.00 8.21 5.70 0.00
103.50 8.21 5.70 0.00
105.00 8.21 5.70 0.00
106.50 8.21 5.70 0.00
108.00 8.21 5.70 0.00
109.50 8.21 5.70 0.00
111.00 8.21 5.70 0.00
112.50 8.21 5.70 0.00
114.00 8.21 5.70 0.00
115.50 8.21 5.70 0.00
117.00 8.21 5.70 0.00
118.50 8.21 5.70 0.00
120.00 8.21 5.70 0.00
•
•
DA1) ?
Post
Pond 1
SubCaf Reach on Llnk
Pond 1 Post
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 2
Area Listing (all nodes)
Area CN Description
(acres) (subcatchment-numbers)
3.494 74 >75% Grass cover, Good, HSG C (DA1)
0.443 98 Paved parking, HSG C (DA1)
0.853 98 Roofs, HSG C (DA1)
4.790 TOTAL AREA
E
0
•
Pond 7 Post
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD0 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 3
Soil Listing (all nodes)
Area Soil Subcatchment
(acres) Goup Numbers
0.000 HSG A
0.000 HSG B
4.790 HSG C DA1
0.000 HSG D
0.000 Other
4.790 TOTAL AREA
•
?J

Pond-1-Post
Prepared by WSP SELLS
HydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software
Type 1124-hr Eden 1 year Rainfall=2.81 "
Printed 6/29/2011
LLC
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Post Runoff Area=4.790 ac 27.06% Impervious Runoff Depth=1.11"
Tc=5.0 min CN=80 Runoff=9.82 cfs 0.443 of
Pond 1 P: Pond 1 Peak Elev=527.54' Storage=0.958 of Inflow=9.82 cfs 0.443 of
Primary=0.41 cfs 0.431 of Secondary=0.00 cfs 0.000 of Outflow=0.41 cfs 0.431 of
Total Runoff Area = 4.790 ac Runoff Volume= 0.443 of Average Runoff Depth =1.11"
72.94% Pervious = 3.494 ac 27.06% Impervious =1.296 ac
•
0
Pond-1-Post
Prepared by WSP SELLS
HydroCAD® 9.00 s/n 04719 t
Type 1124-hr Eden 9 year Rainfall=2.89"
Printed 6/29/2011
LLC
Summary for Subcatchment DA1: Post
Runoff - 9.82 cfs @ 11.97 hrs, Volume= 0.443 af, Depth= 1.11"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 1 year Rainfall=2.81"
Area (ac) CN Description
0.443 98 Paved parking, HSG C
0.853 98 Roofs, HSG C
3.494 74 >75% Grass cover, Good, HSG C
4.790 80 Weighted Average
3.494 72.94% Pervious Area
1.296 27.06% Impervious Area
Tc Length
Description
5.0 Direct Entry,
Subcatchment DA1: Post
Hydrograph
1t
10- 9.e2 d:
Type 1124-hr.Eden
9
1 year
6 Rainfall=2.81"
'Runoff Area=4.790 ac
6- Runoff Volume=0.443 of
5 Runoff Depth
4- Tc=S.0 min
3 GNw-80
1-1
0
10 15 20 25
55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)
Runoff
0
Pond-1-Post Type// 24-hr Eden 9 year Ralnfall=2.89"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD@ 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 6
Hydrograph for Subcatchment DA1: Post
•

Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.05 0.00 0.00
3.00 0.10 0.00 0.00
4.50 0.16 0.00 0.00
6.00 0.22 0.00 0.00
7.50 0.31 0.00 0.00
9.00 0.41 0.00 0.00
10.50 0.57 0.00 0.03
12.00 1.86 0.48 8.85
13.50 2.25 0.72 0.43
15.00 2.40 0.82 0.28
16.50 2.50 0.89 0.21
18.00 2.59 0.95 0.17
19.50 2.66 1.00 0.14
21.00 2.71 1.04 0.12
22.50 2.76 1.07 0.12
24.00 2.81 1.11 0.11
25.50 2.81 1.11 0.00
27.00 2.81 1.11 0.00
28.50 2.81 1.11 0.00
30.00 2.81 1.11 0.00
31.50 2.81 1.11 0.00
33.00 2.81 1.11 0.00
34.50 2.81 1.11 0.00
36.00 2.81 1.11 0.00
37.50 2.81 1.11 0.00
39.00 2.81 1.11 0.00
40.50 2.81 1.11 0.00
42.00 2.81 1.11 0.00
43.50 2.81 1.11 0.00
45.00 2.81 1.11 0.00
46.50 2.81 1.11 0.00
48.00 2.81 1.11 0.00
49.50 2.81 1.11 0.00
51.00 2.81 1.11 0.00
52.50 2.81 1.11 0.00
54.00 2.81 1.11 0.00
55.50 2.81 1.11 0.00
57.00 2.81 1.11 0.00
58.50 2.81 1.11 0.00
60.00 2.81 1.11 0.00
61.50 2.81 1.11 0.00
63.00 2.81 1.11 0.00
64.50 2.81 1.11 0.00
66.00 2.81 1.11 0.00
67.50 2.81 1.11 0.00
69.00 2.81 1.11 0.00
70.50 2.81 1.11 0.00
72.00 2.81 1.11 0.00
73.50 2.81 1.11 0.00
75.00 2.81 1.11 0.00
76.50 2.81 1.11 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 2.81 1.11 0.00
79.50 2.81 1.11 0.00
81.00 2.81 1.11 0.00
82.50 2.81 1.11 0.00
84.00 2.81 1.11 0.00
85.50 2.81 1.11 0.00
87.00 2.81 1.11 0.00
88.50 2.81 1.11 0.00
90.00 2.81 1.11 0.00
91.50 2.81 1.11 0.00
93.00 2.81 1.11 0.00
94.50 2.81 1.11 0.00
96.00 2.81 1.11 0.00
97.50 2.81 1.11 0.00
99.00 2.81 1.11 0.00
100.50 2.81 1.11 0.00
102.00 2.81 1.11 0.00
103.50 2.81 1.11 0.00
105.00 2.81 1.11 0.00
106.50 2.81 1.11 0.00
108.00 2.81 1.11 0.00
109.50 2.81 1.11 0.00
111.00 2.81 1.11 0.00
112.50 2.81 1.11 0.00
114.00 2.81 1.11 0.00
115.50 2.81 1.11 0.00
117.00 2.81 1.11 0.00
118.50 2.81 1.11 0.00
120.00 2.81 1.11 0.00
Pond-1-Post Type// 24-hr Eden 9 year Rainfall=2.89"
Prepared by WSP SELLS Printed 6/29/2011
HydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 7
Summary for Pond 1 P: Pond I
Inflow Area = 4.790 ac, 27.06% Impervious, Inflow Depth = 1.11" for Eden 1 year event
Inflow = 9.82 cfs @ 11.97 hrs, Volume= 0.443 of
Outflow - 0.41 cfs @ 13.65 hrs, Volume= 0.431 af, Atten= 96%, Lag= 101.0 min
Primary = 0.41 cfs @ 13.65 hrs, Volume= 0.431 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Starting Elev= 526.50' Surf.Area= 0.218 ac Storage= 0.693 of
Peak Elev= 527.54'@ 13.65 hrs Surf.Area= 0.281 ac Storage= 0.958 of (0.265 of above start)
Plug-Flow detention time= (not calculated: initial storage excedes outflow)
Center-of-Mass det. time= 1,574.0 min ( 2,419.4 - 845.4 )
Volume Invert Avail.Storage Storage Description
#1 520.00' 1.809 of Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
520.00 0.031 0.000 0.000
521.00 0.045 0.038 0.038
522.00 0.071 0.058 0.096
523.00 0.100 0.085 0.181
524.00 0.124 0.112 0.293
525.00 0.150 0.137 0.430
526.00 0.178 0.164 0.594
526.50 0.218 0.099 0.693
527.00 0.262 0.120 0.813
528.00 0.297 0.279 1.092
529.00 0.348 0.322 1.415
530.00 0.441 0.394 1.809
Device Routing Invert Outlet Devices
#1 Primary 520.00' 30.0" Round 30" Dla. Culvert
L= 90.0' CMP, square edge headwall, Ke= 0.500
Outlet Invert= 518.10' S= 0.0211 'r Cc= 0.900
n= 0.025 Corrugated metal
#2 Device 1 526.50' 1.6" Vert. 1.6" Orifice/Grate C= 0.600
#3 Device 1 527.50' 36.0" Horiz. 36" Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Seconda ry 528.50' 12.0' long x 18.0' 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
E
Pond-9-Post Type 1124-hr Eden 1 year Ralnfall=2.81"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 8
Primary OutFlow Max=0.27 cfs @ 13.65 hrs HW=527.54' (Free Discharge)
=30" Dia. Culvert (Passes 0.27 cis of 48.47 cfs potential flow)
2=1.5" Orifice/Grate (Orifice Controls 0.06 cfs @ 4.75 fps)
3=36" OriflcelGrate (Weir Controls 0.21 cfs @ 0.62 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=526.50' (Free Discharge)
T--4=13road-Crested Rectangular Weir (Controls 0.00 cis)
Pond 1 P: Pond 1
Hydrograph
Inflow
? Outflow
0 Primary
M Secondary
v
Time (hours)
0
Pond-1-Post Type 11 24-hr Eden 9 year Rainfall=2.89"
Prepared by WSP SELLS Printed 6/29/2011
ydroCADS 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 9
Hydrograph for Pond 1 P: Pond 1
Time Inflow Storage Elevation Outflow Primary
0.00 0.00 0.693 526.50 0.00 0.00 0.00
3.00 0.00 0.693 526.50 0.00 0.00 0.00
6.00 0.00 0.693 526.50 0.00 0.00 0.00
9.00 0.00 0.693 526.50 0.00 0.00 0.00
12.00 8.65 0.843 527.11 0.04 0.04 0.00
15.00 0.28 0.955 527.53 0.30 0.30 0.00
18.00 0.17 0.952 527.51 0.18 0.18 0.00
21.00 0.12 0.950 527.51 0.12 0.12 0.00
24.00 0.11 0.950 527.51 0.11 0.11 0.00
27.00 0.00 0.936 527.45 0.06 0.06 0.00
30.00 0.00 0.922 527.41 0.05 0.05 0.00
33.00 0.00 0.909 527.36 0.05 0.05 0.00
36.00 0.00 0.896 527.31 0.05 0.05 0.00
39.00 0.00 0.884 527.26 0.05 0.05 0.00
42.00 0.00 0.872 527.22 0.05 0.05 0.00
45.00 0.00 0.860 527.18 0.05 0.05 0.00
48.00 0.00 0.849 527.13 0.04 0.04 0.00
51.00 0.00 0.838 527.09 0.04 0.04 0.00
54.00 0.00 0.827 527.05 0.04 0.04 0.00
57.00 0.00 0.817 527.02 0.04 0.04 0.00
60.00 0.00 0.808 526,98 0.04 0.04 0.00
63.00 0.00 0.798 526.94 0.04 0.04 0.00
66.00 0.00 0.790 526.91 0.03 0.03 0.00
69.00 0.00 0.781 526.88 0.03 0.03 0.00
72.00 0.00 0.773 526.84 0.03 0.03 0.00
75.00 0.00 0.766 526.81 0.03 0.03 0.00
78.00 0.00 0.759 526.78 0.03 0.03 0.00
81.00 0.00 0.752 526.76 0.03 0.03 0.00
84.00 0.00 0.746 526.73 0.02 0.02 0.00
87.00 0.00 0.740 526.71 0.02 0.02 0.00
90.00 0.00 0.735 526.68 0.02 0.02 0.00
93.00 0.00 0.730 526.66 0.02 0.02 0.00
96.00 0.00 0.726 526.65 0.02 0.02 0.00
99.00 0.00 0.722 526.63 0.01 0.01 0.00
102.00 0.00 0.719 526.61 0.01 0.01 0.00
105.00 0.00 0.716 526.60 0.01 0.01 0.00
108.00 0.00 0.713 526.59 0.01 0.01 0.00
111.00 0.00 0.711 526.58 0.01 0.01 0.00
114.00 0.00 0.708 526.57 0.01 0.01 0.00
117.00 0.00 0.707 526.56 0.01 0.01 0.00
120.00 0.00 0.705 526.55 0.01 0.01 0.00
r-1
L_J
Pond-1-Post Type 1l 24-hr Eden 9 year Rainfall=2.81"
Prepared by WSP SELLS Printed 6/2912011
HydroCAD® 9.00 sin 04719 ® 2009 HydroCAD Software Solutions LLC Page 10
Stage-Discharge for Pond 1 P: Pond 1
•
•
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
520.00 0.00 0.00 0.00
520.10 0.00 0.00 0.00
520.20 0.00 0.00 0.00
520.30 0.00 0.00 0.00
520.40 0.00 0.00 0.00
520.50 0.00 0.00 0.00
520.60 0.00 0.00 0.00
520.70 0.00 0.00 0.00
520.80 0.00 0.00 0.00
520.90 0.00 0.00 0.00
521.00 0.00 0.00 0.00
521.10 0.00 0.00 0.00
521.20 0.00 0.00 0.00
521.30 0.00 0.00 0.00
521.40 0.00 0.00 0.00
521.50 0.00 0.00 0.00
521.60 0.00 0.00 0.00
521.70 0.00 0.00 0.00
521.80 0.00 0.00 0.00
521.90 0.00 0.00 0.00
522.00 0.00 0.00 0.00
522.10 0.00 0.00 0.00
522.20 0.00 0.00 0.00
522.30 0.00 0.00 0.00
522.40 0.00 0.00 0.00
522.50 0.00 0.00 0.00
522.60 0.00 0.00 0.00
522.70 0.00 0.00 0.00
522.80 0.00 0.00 0.00
522.90 0.00 0.00 0.00
523.00 0.00 0.00 0.00
523.10 0.00 0.00 0.00
523.20 0.00 0.00 0.00
523.30 0.00 0.00 0.00
523.40 0.00 0.00 0.00
523.50 0.00 0.00 0.00
523.60 0.00 0.00 0.00
523.70 0.00 0.00 0.00
523.80 0.00 0.00 0.00
523.90 0.00 0.00 0.00
524.00 0.00 0.00 0.00
524.10 0.00 0.00 0.00
524.20 0.00 0.00 0.00
524.30 0.00 0.00 0.00
524.40 0.00 0.00 0.00
524.50 0.00 0.00 0.00
524.60 0.00 0.00 0.00
524.70 0.00 0.00 0.00
524.80 0.00 0.00 0.00
524.90 0.00 0.00 0.00
525.00 0.00 0.00 0.00
525.10 0.00 0.00 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
525.20 0.00 0.00 0.00
525.30 0.00 0.00 0.00
525.40 0.00 0.00 0.00
525.50 0.00 0.00 0.00
525.60 0.00 0.00 0.00
525.70 0.00 0.00 0.00
525.80 0.00 0.00 0.00
525.90 0.00 0.00 0.00
526.00 0.00 0.00 0.00
526.10 0.00 0.00 0.00
526.20 0.00 0.00 0.00
526.30 0.00 0.00 0.00
526.40 0.00 0.00 0.00
526.50 0.00 0.00 0.00
526.60 0.01 0.01 0.00
526.70 0.02 0.02 0.00
526.80 0.03 0.03 0.00
526.90 0.03 0.03 0.00
527.00 0.04 0.04 0.00
527.10 0.04 0.04 0.00
527.20 0.05 0.05 0.00
527.30 0.05 0.05 0.00
527.40 0.05 0.05 0.00
527.50 0.06 0.06 0.00
527.60 1.03 1.03 0.00
527.70 2.82 2.82 0.00
527.80 5.13 5.13 0.00
527.90 7.87 7.87 0.00
528.00 10.97 10.97 0.00
528.10 14.40 14.40 0.00
528.20 18.13 18.13 0.00
528.30 22.13 22.13 0.00
528.40 26.39 26.39 0.00
528.50 30.90 30.90 0.00
528.60 36.66 35.64 1.02
528.70 40.25 37.37 2.88
528.80 44.20 38.89 5.30
528.90 48.56 40.36 8.20
529.00 53.23 41.78 11.46
529.10 58.20 43.15 15.06
529.20 63.24 44.47 18.76
529.30 68.43 45.76 22.67
529.40 74.01 47.01 27.00
529.50 79.79 48.23 31.56
529.60 85.90 49.42 36.48
529.70 92.23 50.59 41.64
529.80 98.68 51.72 46.96
529.90 105.31 52.83 52.48
530.00 112.01 53.92 58.09
Pond _1_Post Type II 24-hr Eden 1 year Rainfall=2.81 "
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 11
Stage-Area-Storage for Pond 1 P: Pond 1
?J
L J
Elevation Surface Storage
(feet) (acres) (acre-feet)
520.00 0.031 0.000
520.10 0.032 0.003
520.20 0.034 0.006
520.30 0.035 0.010
520.40 0.037 0.014
520.50 0.038 0.017
520.60 0.039 0.021
520.70 0.041 0.025
520.80 0.042 0.029
520.90 0.043 0.033
521.00 0.045 0.038
521.10 0.047 0.042
521.20 0.050 0.047
521.30 0.053 0.052
521.40 0.055 0.058
521.50 0.058 0.063
521.60 0.060 0.069
521.70 0.063 0.076
521.80 0.066 0.082
521.90 0.068 0.089
522.00 0.071 0.096
522.10 0.074 0.103
522.20 0.077 0.110
522.30 0.080 0.118
522.40 0.083 0.126
522.50 0.085 0.135
522.60 0.088 0.143
522.70 0.091 0.152
522.80 0.094 0.162
522.90 0.097 0.171
523.00 0.100 0.181
523.10 0.103 0.191
523.20 0.105 0.202
523.30 0.107 0.212
523.40 0.110 0.223
523.50 0.112 0.234
523.60 0.114 0.245
523.70 0.117 0.257
523.80 0.119 0.269
523.90 0.122 0.281
524.00 0.124 0.293
524.10 0.127 0.306
524.20 0.129 0.318
524.30 0.132 0.332
524.40 0.134 0.345
524.50 0.137 0.358
524.60 0.140 0.372
524.70 0.142 0.386
524.80 0.145 0.401
524.90 0.147 0.415
525.00 0.150 0.430
525.10 0.153 0.445
Elevation Surface Storage
(feet) (acres) (acre-feet)
525.20 0.155 0.461
525.30 0.158 0.476
525.40 0.161 0.492
525.50 0.164 0.509
525.60 0.167 0.525
525.70 0.170 0.542
525.80 0.172 0.559
525.90 0.175 0.576
526.00 0.178 0.594
526.10 0.186 0.612
526.20 0.194 0.631
526.30 0.202 0.651
526.40 0.210 0.672
526.50 0.218 0.693
526.60 0.227 0.715
526.70 0.236 0.738
526.80 0.244 0.762
526.90 0.253 0.787
527.00 0.262 0.813
527.10 0.266 0.839
527.20 0.269 0.866
527.30 0.272 0.893
527.40 0.276 0.921
527.50 0.279 0.948
527.60 0.283 0.977
527.70 0.286 1.005
527.60 0.290 1.034
527.90 0.293 1.063
528.00 0.297 1.092
528.10 0.302 1.122
528.20 0.307 1.153
528.30 0.312 1.184
528.40 0.317 1.215
528.50 0.322 1.247
528.60 0.327 1.280
528.70 0.332 1.313
528.80 0.337 1.346
528.90 0.343 1.380
529.00 0.348 1.415
529.10 0.357 1.450
529.20 0.366 1.486
529.30 0.376 1.523
529.40 0.385 1.561
529.50 0.394 1.600
529.60 0.404 1.640
529.70 0.413 1.681
529.80 0.422 1.723
529.90 0.432 1.765
530.00 0.441 1.809
Pond 1_Post Type 1124-hr Eden 10 year Rainfall=5.10"
Prepare_d by WSP SELLS Printed 6/29/2011
HydroCADO 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Pace 12
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Post Runoff Area=4.790 ac 27.06% Impervious Runoff Depth=2.98"
Tc=5.0 min CN=80 Runoff=25.91 cfs 1.190 of
Pond 1P: Pond 1 Peak Elev=528.14' Storage=1.134 of Inflow=25.91 cfs 1.190 of
Primary= 15.83 cfs 1.178 of Secondary=0.00 cfs 0.000 of Outflow= 15.83 cfs 1.178 of
Total Runoff Area = 4.790 ac Runoff Volume =1.190 of Average Runoff Depth = 2.98"
72.94% Pervious = 3.494 ac 27.06% Impervious =1.296 ac

0
Pond-1-Post Type 11 24-hr Eden 10 year Rainfall=5.10"
Prepared by WSP SELLS Printed 6/29/2011
. HydroCAD® 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Page 13
Summary for Subcatchment DA1: Post
Runoff = 25.91 cfs @ 11.96 hrs, Volume= 1.190 af, Depth= 2.98"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type 1124-hr Eden 10 year Rainfall=5.10"
Area (ac) CN Description
0.443 98 Paved parking, HSG C
0.853 98 Roofs, HSG C
3.494 74 >75% Grass cover, Good, HSG C
4.790 80 Weighted Average
3.494 72.94% Pervious Area
1.296 27.06% Impervious Area
Tc Length Slope Velocity Capacity Description
5.0
Direct Entry,
Subcatchment DA1: Post
Hydrograph
u
18
16
14
12
4
0
Type II 24-hr Eden
10 year
Rainfall=5.10"
Runoff Area4.790 ac
Runoff Volume=1.190 of
Runoff Depth=2.98"
Tc=5.0 min
CN=80
15 20 25 30 35 40 45 50
Time (hours)
105 110 115
® Rurwtf
0
Pond _1_Post Type 1l 24-hr Eden 90 year Rainfall=5.90"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Pace 14
Hydrograph for Subcatchment DA1: Post
r?
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.08 0.00 0.00
3.00 0.18 0.00 0.00
4.50 0.28 0.00 0.00
6.00 0.41 0.00 0.00
7.50 0.56 0.00 0.02
9.00 0.75 0.02 0.13
10.50 1.04 0.10 0.39
12.00 3.38 1.54 22.17
13.50 4.07 2.10 1.00
15.00 4.35 2.34 0.64
16.50 4.55 2.50 0.46
18.00 4.70 2.63 0.39
19.50 4.82 2.74 0.31
21.00 4.92 2.82 0.27
22.50 5.01 2.90 0.25
24.00 5.10 2.98 0.24
25.50 5.10 2.98 0.00
27.00 5.10 2.98 0.00
28.50 5.10 2.98 0.00
30.00 5.10 2.98 0.00
31.50 5.10 2.98 0.00
33.00 5.10 2.98 0.00
34.50 5.10 2.98 0.00
36.00 5.10 2.98 0.00
37.50 5.10 2.98 0.00
39.00 5.10 2.98 0.00
40.50 5.10 2.98 0.00
42.00 5.10 2.98 0.00
43.50 5.10 2.98 0.00
45.00 5.10 2.98 0.00
46.50 5.10 2.98 0.00
48.00 5.10 2.98 0.00
49.50 5.10 2.98 0.00
51.00 5.10 2.98 0.00
52.50 5.10 2.98 0.00
54.00 5.10 2.98 0.00
55.50 5.10 2.98 0.00
57.00 5.10 2.98 0.00
58.50 5.10 2.98 0.00
60.00 5.10 2.98 0.00
61.50 5.10 2.98 0.00
63.00 5.10 2.98 0.00
64.50 5.10 2.98 0.00
66.00 5.10 2.98 0.00
67.50 5.10 2.98 0.00
69.00 5.10 2.98 0.00
70.50 5.10 2.98 0.00
72.00 5.10 2.98 0.00
73.50 5.10 2.98 0.00
75.00 5.10 2.98 0.00
76.50 5.10 2.98 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 5.10 2.98 0.00
79.50 5.10 2.98 0.00
81.00 5.10 2.98 0.00
82.50 5.10 2.98 0.00
84.00 5.10 2.98 0.00
85.50 5.10 2.98 0.00
87.00 5.10 2.98 0.00
88.50 5.10 2.98 0.00
90.00 5.10 2.98 0.00
91.50 5.10 2.98 0.00
93.00 5.10 2.98 0.00
94.50 5.10 2.98 0.00
96.00 5.10 2.98 0.00
97.50 5.10 2.98 0.00
99.00 5.10 2.98 0.00
100.50 5.10 2.98 0.00
102.00 5.10 2.98 0.00
103.50 5.10 2.98 0.00
105.00 5.10 2.98 0.00
106.50 5.10 2.98 0.00
108.00 5.10 2.98 0.00
109.50 5.10 2.98 0.00
111.00 5.10 2.98 0.00
112.50 5.10 2.98 0.00
114.00 5.10 2.98 0.00
115.50 5.10 2.98 0.00
117.00 5.10 2.98 0.00
118.50 5.10 2.98 0.00
120.00 5.10 2.98 0.00
Pond 1_Post Type 1124-hr Eden 10 year Ralnfall=5.10"
Prepare_d by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 15
Summary for Pond 1 P: Pond 1
Inflow Area = 4.790 ac, 27.06% Impervious, Inflow Depth = 2.98" for Eden 10 year event
Inflow - 25.91 cfs @ 11.96 hrs, Volume= 1.190 of
Outflow = 15.83 cfs @ 12.03 hrs, Volume= 1.178 af, Atten= 39%, Lag= 4.4 min
Primary = 15.83 cis @ 12.03 hrs, Volume= 1.178 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Starting Elev= 526.50' Surf.Area= 0.218 ac Storage= 0.693 of
Peak Elev= 528.14'@ 12.03 hrs Surf.Area= 0.304 ac Storage= 1.134 of (0.441 of above start)
Plug-Flow detention time= 1,641.7 min calculated for 0.484 of (41% of inflow)
Center-of-Mass det. time= 596.5 min (1,413.4 - 816.9 )
Volume Invert Avaii.Storage Storage Description
#1 520.00' 1.809 of Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) ( acres) (acre-feet) (acre-feet)
520.00 0.031 0.000 0.000
521.00 0.045 0.038 0.038
522.00 0.071 0.058 0.096
523.00 0.100 0.085 0.181
524.00 0.124 0.112 0.293
525.00 0.150 0.137 0.430
526.00 0.178 0.164 0.594
526.50 0.218 0.099 0.693
527.00 0.262 0.120 0.813
528.00 0.297 0.279 1.092
529.00 0.348 0.322 1.415
530.00 0.441 0.394 1.809
Device Routing Invert Outlet Devices
#1 Primary 520.00' 30.0" Round 30" Dia. Culvert
L= 90.0' CMP, square edge headwall, Ke= 0.500
Outlet Invert= 518.10' S= 0.0211 '/' Cc= 0.900
n= 0.025 Corrugated metal
#2 Device 1 526.50' 1.5" Vert. 1.6" Orifice/Grate C= 0.600
#3 Device 1 527.50' 36.0" Horiz. 36" Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Seconda ry 528.50' 12.0' long x 18.0' 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
0
•
Pond-1-Post Type 1124-hr Eden 10 year Rainfall=5.10"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 sln 04719 02009 HydroCAD Software Solutions LLC page I
rimary OutFlow Max=15.70 cis 012.03 hrs HW=528.14' (Free Discharge)
=30" Dia. Culvert (Passes 15.70 cfs of 50.52 cfs potential flow)
2=1.6" Orifice/Grate (Orifice Controls 0.07 cfs @ 6.04 fps)
3=36" Orifice/Grate (Weir Controls 15.62 cfs @ 2.61 fps)
yecondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=526.50' (Free Discharge)
r--4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Pond 1 P: Pond 1
Hydrograph
13 Inflow
? Outflow
Primary
M Secondary
•
LL
Time (hours)

•
•
Pond 1Post
Prepar__by WSP SELLS
HvdroCAD® 9.00 s/n 04719 ® 2009
Type 11 24-hr Eden 10 year Rainfall=5.40"
Printed 6/29/2011
LLC
Hydrograph for Pond 1P: Pond 1
Time Inflow Storage Elevation Outflow Primary Secondary
0.00 0.00 0.693 526.50 0.00 0.00 0.00
3.00 0.00 0.693 526.50 0.00 0.00 0.00
6.00 0.00 0.693 526.50 0.00 0.00 0.00
9.00 0.13 0.701 526.54 0.00 0.00 0.00
12.00 22.17 1.124 528.11 14.64 14.64 0.00
15.00 0.64 0.967 527.56 0.69 0.69 0.00
18.00 0.39 0.958 527.54 0.40 0.40 0.00
21.00 0.27 0.955 527.52 0.27 0.27 0.00
24.00 0.24 0.954 527.52 0.24 0.24 0.00
27.00 0.00 0.937 527.46 0.06 0.06 0.00
30.00 0.00 0.923 527.41 0.05 0.05 0.00
33.00 0.00 0.910 527.36 0.05 0.05 0.00
36.00 0.00 0.897 527.31 0.05 0.05 0.00
39.00 0.00 0.885 527.27 0.05 0.05 0.00
42.00 0.00 0.873 527.22 0.05 0.05 0.00
45.00 0.00 0.861 527.18 0.05 0.05 0.00
48.00 0.00 0.850 527.14 0.04 0.04 0.00
51.00 0.00 0.839 527.10 0.04 0.04 0.00
54.00 0.00 0.828 527.06 0.04 0.04 0.00
57.00 0.00 0.818 527.02 0.04 0.04 0.00
60.00 0.00 0.808 526.98 0.04 0.04 0.00
63.00 0.00 0.799 526.95 0.04 0.04 0.00
66.00 0.00 0.790 526.91 0.03 0.03 0.00
69.00 0.00 0.782 526.88 0.03 0.03 0.00
72.00 0.00 0.774 526.85 0.03 0.03 0.00
75.00 0.00 0.766 526.82 0.03 0.03 0.00
78.00 0.00 0.759 526.79 0.03 0.03 0.00
81.00 0.00 0.753 526.76 0.03 0.03 0.00
84.00 0.00 0.746 526.73 0.02 0.02 0.00
87.00 0.00 0.741 526.71 0.02 0.02 0.00
90.00 0.00 0.735 526.69 0.02 0.02 0.00
93.00 0.00 0.730 526.67 0.02 0.02 0.00
96.00 0.00 0.726 526.65 0.02 0.02 0.00
99.00 0.00 0.722 526.63 0.01 0.01 0.00
102.00 0.00 0.719 526.62 0.01 0.01 0.00
105.00 0.00 0.716 526.60 0.01 0.01 0.00
108.00 0.00 0.713 526.59 0.01 0.01 0.00
111.00 0.00 0.711 526.58 0.01 0.01 0.00
114.00 0.00 0.709 526.57 0.01 0.01 0.00
117.00 0.00 0.707 526.56 0.01 0.01 0.00
120.00 0.00 0.705 526.55 0.01 0.01 0.00
0
Pond _1_Post Type 1124-hr Eden 10 year Rainfall=5.10"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC ' Paae 18
Stage-Discharge for Pond 1 P: Pond 1
•
•
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
520.00 OAO 0.00 0.00
520.10 0.00 0.00 0.00
520.20 0.00 0.00 0.00
520.30 0.00 0.00 0.00
520.40 0.00 0.00 0.00
520.50 0.00 0.00 0.00
520.60 0.00 0.00 0.00
520.70 0.00 0.00 0.00
520.80 0.00 0.00 0.00
520.90 0.00 0.00 0.00
521.00 0.00 0.00 0.00
521.10 0.00 0.00 0.00
521.20 0.00 0.00 0.00
521.30 0.00 0.00 0.00
521.40 0.00 0.00 0.00
521.50 0.00 0.00 0.00
521.60 0.00 0.00 0.00
521.70 0.00 0.00 0.00
521.80 0.00 0.00 0.00
521.90 0.00 0.00 0.00
522.00 0.00 0.00 0.00
522.10 0.00 0.00 0.00
522.20 0.00 0.00 0.00
522.30 0.00 0.00 0.00
522.40 0.00 0.00 0.00
522.50 0.00 0.00 0.00
522.60 0.00 0.00 0.00
522.70 0.00 0.00 0.00
522.80 0.00 0.00 0.00
522.90 0.00 0.00 0.00
523.00 0.00 0.00 0.00
523.10 0.00 0.00 0.00
523.20 0.00 0.00 0.00
523.30 0.00 0.00 0.00
523.40 0.00 0.00 0.00
523.50 0.00 0.00 0.00
523.60 0.00 0.00 0.00
523.70 0.00 0.00 0.00
523.80 0.00 0.00 0.00
523.90 0.00 0.00 0.00
524.00 0.00 0.00 0.00
524.10 0.00 0.00 0.00
524.20 0.00 0.00 0.00
524.30 0.00 0.00 0.00
524.40 0.00 0.00 0.00
524.50 0.00 0.00 0.00
524.60 0.00 0.00 0.00
524.70 0.00 0.00 0.00
524.80 0.00 0.00 0.00
524.90 0.00 0.00 0.00
525.00 0.00 0.00 0.00
525.10 0.00 0.00 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
525.20 0.00 0.00 0.00
525.30 0.00 0.00 0.00
525.40 0.00 0.00 0.00
525.50 0.00 0.00 0.00
525.60 0.00 0.00 0.00
525.70 0.00 0.00 0.00
525.80 0.00 0.00 0.00
525.90 0.00 0.00 0.00
526.00 0.00 0.00 0.00
526.10 0.00 0.00 0.00
526.20 0.00 0.00 0.00
526.30 0.00 0.00 0.00
526.40 0.00 0.00 0.00
526.50 0.00 0.00 0.00
526.60 0.01 0,01 0.00
526.70 0.02 0.02 0.00
526.80 0.03 0.03 0.00
526.90 0.03 0.03 0.00
527.00 0.04 0.04 0.00
527.10 0.04 0.04 0.00
527.20 0.05 0.05 0.00
527.30 0.05 0.05 0.00
527.40 0.05 0.05 0.00
527.50 0.06 0.06 0.00
527.60 1.03 1.03 0.00
527.70 2.82 2.82 0.00
527.80 5.13 5.13 0.00
527.90 7.87 7.87 0.00
528.00 10.97 10.97 0.00
528.10 14.40 14.40 0.00
528.20 18.13 18.13 0.00
528.30 22.13 22.13 0.00
528.40 26.39 26.39 0.00
528.50 30.90 30.90 0.00
528.60 36.66 35.64 1.02
528.70 40.25 37.37 2.88
528.80 44.20 38.89 5.30
528.90 48.56 40.36 8.20
529.00 53.23 41.78 11.46
529.10 58.20 43.15 15.06
529.20 63.24 44.47 18.76
529.30 68.43 45.76 22.67
529.40 74.01 47.01 27.00
529.50 79.79 48.23 31.56
529.60 85.90 49.42 36.48
529.70 92.23 50.59 41.64
529.80 98.68 51.72 46.96
529.90 105.31 52.83 52,48
530.00 112.01 53.92 58.09
Pond-1-Post Type 11 24-hr Eden 10 year Rainfall=5.10"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 19
Stage-Area-Storage for Pond 1 P: Pond 1

•
Elevation Surface Storage
(feet) (acres) (acre-feet)
520.00 0.031 0.000
520.10 0.032 0.003
520.20 0.034 0.006
520.30 0.035 0.010
520.40 0.037 0.014
520.50 0.038 0.017
520.60 0.039 0.021
520.70 0.041 0.025
520.80 0.042 0.029
520.90 0.043 0.033
521.00 0.045 0.038
521.10 0.047 0.042
521.20 0.050 0.047
521.30 0.053 0.052
521.40 0.055 0.058
521.50 0.058 0.063
521.60 0.060 0.069
521.70 0.063 0.076
521.80 0.066 0.082
521.90 0.068 0.089
522.00 0.071 0.096
522.10 0.074 0.103
522.20 0.077 0.110
522.30 0.080 0.118
522.40 0.083 0.126
522.50 0.085 0.135
522.60 0.088 0.143
522.70 0.091 0.152
522.80 0.094 0.162
522.90 0.097 0.171
523.00 0.100 0.181
523.10 0.103 0.191
523.20 0.105 0.202
523.30 0.107 0.212
523.40 0.110 0.223
523.50 0.112 0.234
523.60 0.114 0.245
523.70 0.117 0.257
523.80 0.119 0.269
523.90 0.122 0.281
524.00 0.124 0.293
524.10 0.127 0.306
524.20 0.129 0.318
524.30 0.132 0.332
524.40 0.134 0.345
524.50 0.137 0.358
524.60 0.140 0.372
524.70 0.142 0.386
524.80 0.145 0.401
524.90 0.147 0.415
525.00 0.150 0.430
525.10 0.153 0.445
Elevation Surface Storage
(feet) (acres) (acre-feet)
525.20 0.155 0.461
525.30 0.158 0.476
525.40 0.161 0.492
525.50 0.164 0.509
525.60 0.167 0.525
525.70 0.170 0.542
525.80 0.172 0.559
525.90 0.175 0.576
526.00 0.178 0.594
526.10 0.186 0.612
526.20 0.194 0.631
526.30 0.202 0.651
526.40 0.210 0.672
526.50 0.218 0.693
526.60 0.227 0.715
526.70 0.236 0.738
526.80 0.244 0.762
526.90 0.253 0.787
527.00 0.262 0.813
527.10 0.266 0.839
527.20 0.269 0.866
527.30 0.272 0.893
527.40 0.276 0.921
527.50 0.279 0.948
527.60 0.283 0.977
527.70 0.286 1.005
527.80 0.290 1.034
527.90 0.293 1.063
528.00 0.297 1.092
528.10 0.302 1.122
528.20 0.307 1.153
528.30 0.312 1.184
528.40 0.317 1.215
528.50 0.322 1.247
528.60 0.327 1.280
528.70 0.332 1.313
528.80 0.337 1.346
528.90 0.343 1.380
529.00 0.348 1.415
529.10 0.357 1.450
529.20 0.366 1.486
529.30 0.376 1.523
529.40 0.385 1.561
529.50 0.394 1.600
529.60 0.404 1.640
529.70 0.413 1.681
529.80 0.422 1.723
529.90 0.432 1.765
530.00 0.441 1.809
Pond-1-Post Type// 24-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/2912011
HydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 20
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Post Runoff Area=4.790 ac 27.06% Impervious Runoff Depth=3.98"
Tc=5.0 min CN=80 Runoff=34.15 cfs 1.589 of
Pond 1 P: Pond 1 Peak Elev=528.37' Storage=1.204 of inflow=34.15 cfs 1.589 of
Primary=24.93 cfs 1.577 of Secondary=0.00 cfs 0.000 of Outflow=24.93 cfs 1.577 of
Total Runoff Area = 4.790 ac Runoff Volume =1.589 of Average Runoff Depth = 3.98"
72.94% Pervious = 3.494 ac 27.06% Impervious =1.296 ac
•
is
•
Pond-1-Rost Type 1124-hr Eden 25 year RainfalM.22"
Prepared by WSP SELLS Printed 6/29/2011
H.ydroCAD® 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Page 21
Summary for Subcatchment DA1: Post
11 38
Runoff = 34.15 cfs @ 11.96 hrs, Volume= 1.589 af, Depth= 3.98"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 25 year Rainfall=6.22"
Area (ac) CN Description
0.443 98 Paved parking, HSG C
0.853 98 Roofs, HSG C
3.494 74 >75% Grass cover, Good, HSG C
4.790 80 Weighted Average
3.494 72.94% Pervious Area
1.296 27.06% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,

Subcatchment DA1: Post
Hydrograph
34.16 dr
Type II 24-hr-Eden
25 year
Rainfall-6.22"
Runoff Area=4.790 ac
Runoff Volume=1.589 of
Runoff-Depth=3.98"
Tc-5.0 min
CN=80
a
5 10 15
55 80 65 70 75 80
Time (hours)
110 115 1
® Runoff
0
Pond _1_Post Type 1124-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/29/2011
• HydroCADV 9.00 s/n 04719 0 2009 HydroCAD Software Solutions LLC Pace 22
Hydrograph for Subcatchment DA1: Post
•
?J
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.10 0.00 0.00
3.00 0.21 0.00 0.00
4.50 0.34 0.00 0.00
6.00 0.50 0.00 0.00
7.50 0.68 0.01 0.08
9.00 0.91 0.06 0.24
10.50 1.27 0.18 0.61
12.00 4.12 2.14 29.03
13.50 4.97 2.87 1.29
15.00 5.31 3.16 0.81
16.50 5.54 3.37 0.59
18.00 5.73 3.54 0.49
19.50 5.88 3.67 0.39
21.00 6.00 3.78 0.34
22.50 6.11 3.88 0.32
24.00 6.22 3.98 0.30
25.50 6.22 3.98 0.00
27.00 6,22 3.98 0.00
28.50 6.22 3.98 0.00
30.00 6.22 3.98 0.00
31.50 6.22 3.98 0.00
33.00 6.22 3.98 0.00
34.50 6.22 3.98 0.00
36.00 6.22 3.98 0.00
37.50 6.22 3.98 0.00
39.00 6.22 3.98 0.00
40.50 6.22 3.98 0.00
42.00 6.22 3.98 0.00
43.50 6.22 3.98 0.00
45.00 6.22 3.98 0.00
46.50 6.22 3.98 0.00
48.00 6.22 3.98 0.00
49.50 6.22 3.98 0.00
51.00 6.22 3.98 0.00
52.50 6.22 3.98 0.00
54.00 6.22 3.98 0.00
55.50 6.22 3.98 0.00
57.00 6.22 3.98 0.00
58.50 6.22 3.98 0.00
60.00 6.22 3.98 0.00
61.50 6.22 3.98 0.00
63.00 6.22 3.98 0.00
64.50 6.22 3.98 0.00
66.00 6.22 3.98 0.00
67.50 6.22 3.98 0.00
69.00 6.22 3.98 0.00
70.50 6.22 3.98 0.00
72.00 6.22 3.98 0.00
73.50 6.22 3.98 0.00
75.00 6.22 3.98 0.00
76.50 6.22 3.98 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 6.22 3.98 0.00
79.50 6.22 3.98 0.00
81.00 6.22 3.98 0.00
82.50 6.22 3.98 0.00
84.00 6.22 3.98 0.00
85.50 6.22 3.98 0.00
87.00 6.22 3.98 0.00
88.50 6.22 3.98 0.00
90.00 6.22 3.98 0.00
91.50 6.22 3.98 0.00
93.00 6.22 3.98 0.00
94.50 6.22 3.98 0.00
96.00 6.22 3.98 0.00
97.50 6.22 3.98 0.00
99.00 6.22 3.98 0.00
100.50 6.22 3.98 0.00
102.00 6.22 3.98 0.00
103.50 6.22 3.98 0.00
105.00 6.22 3.98 0.00
106.50 6.22 3.98 0.00
108.00 6.22 3.98 0.00
109.50 6.22 3.98 0.00
111.00 6.22 3.98 0.00
112.50 6.22 3.98 0.00
114.00 6.22 3.98 0.00
115.50 6.22 3.98 0.00
117.00 6.22 3.98 0.00
118.50 6.22 3.98 0.00
120.00 6.22 3.98 0.00
Pond _1_Post Type 11 24-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/29/2011
• HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Pace 23
Summary for Pond 1 P: Pond 1
Inflow Area = 4.790 ac, 27.06% Impervious, Inflow Depth = 3.98" for Eden 25 year event
Inflow - 34.15 cfs @ 11.96 hrs, Volume= 1.589 of
Outflow = 24.93 cis @ 12.02 hrs, Volume= 1.577 af, Atten= 27%, Lag= 3.4 min
Primary = 24.93 cfs @ 12.02 hrs, Volume= 1.577 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Starting Elev= 526.50' Surf.Area= 0.218 ac Storage= 0.693 of
Peak Elev= 528.37'@ 12.02 hrs Surf.Area= 0.315 ac Storage= 1.204 of (0.511 of above start)
Plug-Flow detention time= 984.8 min calculated for 0.884 of (56% of inflow)
Center-of-Mass det. time= 453.0 min (1,261.7 - 808.7 )
Volume Invert Avaii.Storage Storage Description
#1 520.00' 1.809 of Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
520.00 0.031 0.000 0.000
521.00 0.045 0.038 0.038
522.00 0.071 0.058 0.096
523.00 0.100 0.085 0.181
524.00 0.124 0.112 0.293
525.00 0.150 0.137 0.430
526.00 0.178 0.164 0.594
526.50 0.218 0.099 0.693
527.00 0.262 0.120 0.813
528.00 0.297 0.279 1.092
529.00 0.348 0.322 1.415
530.00 0.441 0.394 1.809
Device Routing Invert Outlet Devices
#1 Primary 520.00' 30.0" Round 30" Dia. Culvert
L= 90.0' CMP, square edge headwall, Ke= 0.500
Outlet Invert= 518.10' S= 0.0211 T Cc= 0.900
n= 0.025 Corrugated metal
#2 Device 1 526.50' 1.5" Vert. 1.6" Orifice/Grate C= 0.600
#3 Device 1 527.50' 36.0" Horiz. 36" Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Seconda ry 528.50' 12.0' long x 18.0' 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
0
Pond-9-Post Type /I 24-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 24
rimary OutFlow Max=24.61 cfs @ 12.02 hrs HW=528.36 (Free Discharge)
T =30" Dia. Culvert (Passes 24.61 cfs of 51.27 cfs potential flow)
2=1.5" Oriflce/Grate (Orifice Controls 0.08 cfs @ 6.45 fps)
3=36" Orifice/Grate (Weir Controls 24.53 cfs @ 3.03 fps)
econdary OutFlow Max=0.00 cfs @ 0.00 hrs HW=526.50' (Free Discharge)
=Broad-Crested Rectangular Weir (Controls 0.00 cfs)
Pond 1 P: Pond 1
Hydrograph
inflow
C7 Outflow
Primary
i Secondary
1? J
22
.. 20
18
ii to
Time (hours)
0
Pond-1-Post Type 1124-hr Eden 25 year Rainfall=6.22"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD0 9.00 s/n 04719 02009 HydroCAD Software Solutions I-I-C Page 25
Hydrograph for Pond 1P: Pond 1
Time Inflow Storage Elevation Outflow
0.00 0.00 0.693 526.50 0.00 0.00 0.00
3.00 0.00 0.693 526.50 0.00 0.00 0.00
6.00 0.00 0.693 526.50 0.00 0.00 0.00
9.00 0.24 0.714 526.60 0.01 0.01 0.00
12.00 29.03 1.202 528.36 24.58 24.58 0.00
15.00 0.81 0.972 527.58 0.87 0.87 0.00
18.00 0.49 0.962 527.55 0.51 0.51 0.00
21.00 0.34 0.957 527.53 0.35 0.35 0.00
24.00 0.30 0.956 527.53 0.31 0.31 0.00
27.00 0.00 0.937 527.46 0.06 0.06 0.00
30.00 0.00 0.924 527.41 0.05 0.05 0.00
33.00 0.00 0.911 527.36 0.05 0.05 0.00
36.00 0.00 0.898 527.32 0.05 0.05 0.00
39.00 0.00 0.885 527.27 0.05 0.05 0.00
42.00 0.00 0.873 527.23 0.05 0.05 0.00
45.00 0.00 0.861 527.18 0.05 0.05 0.00
48.00 0.00 0.850 527.14 0.04 0.04 0.00
51.00 0.00 0.839 527.10 0.04 0.04 0.00
54.00 0.00 0.828 527.06 0.04 0.04 0.00
57.00 0.00 0.818 527.02 0.04 0.04 0.00
60.00 0.00 0.809 526.98 0.04 0.04 0.00
•
63.00 0.00 0.799 526.95 0.04 0.04 0.00
66.00 0.00 0.791 526.91 0.03 0.03 0.00
69.00 0.00 0.782 526.88 0.03 0.03 0.00
72.00 0.00 0.774 526.85 0.03 0.03 0.00
75.00 0.00 0.767 526.82 0.03 0.03 0.00
78.00 0.00 0.759 526.79 0.03 0.03 0.00
81.00 0.00 0.753 526.76 0.03 0.03 0.00
84.00 0.00 0.746 526.73 0.02 0.02 0.00
87.00 0.00 0.741 526.71 0.02 0.02 0.00
90.00 0.00 0.735 526.69 0.02 0.02 0.00
93.00 0.00 0.731 526.67 0.02 0.02 0.00
96.00 0.00 0.726 526.65 0.02 0.02 0.00
99.00 0.00 0.722 526.63 0.01 0.01 0.00
102.00 0.00 0.719 526.62 0.01 0.01 0.00
105.00 0.00 0.716 526.60 0.01 0.01 0.00
108.00 0.00 0.713 526.59 0.01 0.01 0.00
111.00 0.00 0.711 526.58 0.01 0.01 0.00
114.00 0.00 0.709 526.57 0.01 0.01 0.00
117.00 0.00 0.707 526.56 0.01 0.01 0.00
120.00 0.00 0.705 526.55 0.01 0.01 0.00
0
Pond _1_Post Type 11 24-hr Eden 25 year Rainfall=6.22"
. Prepared by WSP SELLS Printed 6/29/2011
HydroCAD09.00 s/n 04719 02009 HydroCAD Software Solutions LLC Pace 26
Stage-Discharge for Pond 1 P: Pond 1
•

Elevation Discharge Primary Secondary
(feet) (oft) (cfs) (cfs)
520.00 0.00 0.00 0.00
520.10 0.00 0.00 0.00
520.20 0.00 0.00 0.00
520.30 0.00 0.00 0.00
520.40 0.00 0.00 0.00
520.50 0.00 0.00 0.00
520.60 0.00 0.00 0.00
520.70 0.00 0.00 0.00
520.80 0.00 0.00 0.00
520.90 0.00 0.00 0.00
521.00 0.00 0.00 0.00
521.10 0.00 0.00 0.00
521.20 0.00 0.00 0.00
521.30 0.00 0.00 0.00
521.40 0.00 0.00 0.00
521.50 0.00 0.00 0.00
521.60 0.00 0.00 0.00
521.70 0.00 0.00 0.00
521.80 0.00 0.00 0.00
521.90 0.00 0.00 0.00
522.00 0.00 0.00 0.00
522.10 0.00 0.00 0.00
522.20 0.00 0.00 0.00
522.30 0.00 0.00 0.00
522.40 0.00 0.00 0.00
522.50 0.00 0.00 0.00
522.60 0.00 0.00 0.00
522.70 0.00 0.00 0.00
522.80 0.00 0.00 0.00
522.90 0.00 0.00 0.00
523.00 0.00 0.00 0.00
523.10 0.00 0.00 0.00
523.20 0.00 0.00 0.00
523.30 0.00 0.00 0.00
523.40 0.00 0.00 0.00
523.50 0.00 0.00 0.00
523.60 0.00 0.00 0.00
523.70 0.00 0.00 0.00
523.80 0.00 0.00 0.00
523.90 0.00 0.00 0.00
524.00 0.00 0.00 0.00
524.10 0.00 0.00 0.00
524.20 0.00 0.00 0.00
524.30 0.00 0.00 0.00
524.40 0.00 0.00 0.00
524.50 0.00 0.00 0.00
524.60 0.00 0.00 0.00
524.70 0.00 0.00 0.00
524.80 0.00 0.00 0.00
524.90 0.00 0.00 0.00
525.00 0.00 0.00 0.00
525.10 0.00 0.00 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
525.20 0.00 0.00 0.00
525.30 0.00 0.00 0.00
525.40 0.00 0.00 0.00
525.50 0.00 0.00 0.00
525.60 0.00 0.00 0.00
525.70 0.00 0.00 0.00
525.80 0.00 0.00 0.00
525.90 0.00 0.00 0.00
526.00 0.00 0.00 0.00
526.10 0.00 0.00 0.00
526.20 0.00 0.00 0.00
526.30 0.00 0.00 0.00
526.40 0.00 0.00 0.00
526.50 0.00 0.00 0.00
526.60 0.01 0.01 0.00
526.70 0.02 0.02 0.00
526.80 0.03 0.03 0.00
526.90 0.03 0.03 0.00
527.00 0.04 0.04 0.00
527.10 0.04 0.04 0.00
527.20 0.05 0.05 0.00
527.30 0.05 0.05 0.00
527.40 0.05 0.05 0.00
527.50 0.06 0.06 0.00
527.60 1.03 1.03 0.00
527.70 2.82 2.82 0.00
527.80 5.13 5.13 0.00
527.90 7.87 7.87 0.00
528.00 10.97 10.97 0.00
528.10 14.40 14.40 0.00
528.20 18.13 18.13 0.00
528.30 22.13 22.13 0.00
528.40 26.39 26.39 0.00
528.50 30.90 30.90 0.00
528.60 36.66 35.64 1.02
528.70 40.25 37.37 2.88
528.80 44.20 38.89 5.30
528.90 48.56 40.36 8.20
529.00 53.23 41.78 11.46
529.10 58.20 43.15 15.06
529.20 63.24 44.47 18.76
529.30 68.43 45.76 22.67
529.40 74.01 47.01 27.00
529.50 79.79 48.23 31.56
529.60 85.90 49.42 36.48
529.70 92.23 50.59 41.64
529.80 98.68 51.72 46.96
529.90 105.31 52.83 52.48
530.00 112.01 53.92 58.09
Pond _1_Post Type II 24-hr Eden 25 year Rainfall=8.22"
• Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 27
Stage-Area-Storage for Pond 1 P: Pond 1

0 524.80 0.145 0.401
Elevation Surface Storage
(feet) _ (acres) (acre-feet)
520.00 0.031 01000
520.10 0.032 0.003
520.20 0.034 0.006
520.30 0.035 0.010
520.40 0.037 0.014
520.50 0.038 0.017
520.60 0.039 0.021
520.70 0.041 0.025
520.80 0.042 0.029
520.90 0.043 0.033
521.00 0.045 0.038
521.10 0.047 0.042
521.20 0.050 0.047
521.30 0.053 0.052
521.40 0.055 0.058
521.50 0.058 0.063
521.60 0.060 0.069
521.70 0.063 0.076
521.80 0.066 0.082
521.90 0.068 0.089
522.00 0.071 0.096
522.10 0.074 0.103
522.20 0.077 0.110
522.30 0.080 0.118
522.40 0.083 0.126
522.50 0.085 0.135
522.60 0.088 0,143
522.70 0.091 0.152
522.80 0.094 0.162
522.90 0.097 0.171
523.00 0.100 0.181
523.10 0.103 0.191
523.20 0.105 0.202
523.30 0.107 0.212
523.40 0.110 0.223
523.50 0.112 0.234
523.60 0.114 0.245
523.70 0.117 0.257
523.80 0.119 0.269
523.90 0.122 0.281
524.00 0.124 0.293
524.10 0.127 0.306
524.20 0.129 0.318
524.30 0.132 0.332
524.40 0.134 0.345
524.50 0.137 0.358
524.60 0.140 0.372
524.70 0.142 0.386

524.90 0.147 0.415
525.00 0.150 0,430
525.10 0.153 0.445
Elevation Surface Storage
(feet) (acres) (acre-feet)
525.20 0.155 0.461
525.30 0.158 0.476
525.40 0.161 0.492
525.50 0.164 0.509
525.60 0.167 0.525
525.70 0.170 0.542
525.80 0.172 0.559
525.90 0.175 0.576
526.00 0.178 0.594
526.10 0.186 0.612
526.20 0.194 0.631
526.30 0.202 0.651
526.40 0.210 0.672
526.50 0.218 0.693
526.60 0.227 0.715
526.70 0.236 0.738
526.80 0.244 0.762
526.90 0.253 0.787
527.00 0.262 0.813
527.10 0.266 0.839
527.20 0.269 0.866
527.30 0.272 0.893
527.40 0.276 0.921
527.50 0.279 0.948
527.60 0.283 0.977
527.70 0.286 1.005
527.80 0.290 1.034
527.90 0.293 1.063
528.00 0.297 1.092
528.10 0.302 1.122
528.20 0.307 1.153
528.30 0.312 1.184
528.40 0.317 1.215
528.50 0.322 1.247
528.60 0.327 1.280
528.70 0.332 1.313
528.80 0.337 1.346
528.90 0.343 1.380
529.00 0.348 1.415
529.10 0.357 1.450
529.20 0.366 1.486
529.30 0.376 1.523
529.40 0.385 1.561
529.50 0.394 1.600
529.60 0.404 1.640
529.70 0.413 1.681
529.80 0.422 1.723
529.90 0.432 1.765
530.00 0.441 1.809
Pond _1_Post Type 11 24-hr Eden 50 year Rainfall=7.97"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 28
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Post Runoff Area=4.790 ac 27.06% Impervious Runoff Depth=4.85"
Tc=5.0 min CN=80 Runoff=41.18 cfs 1.937 of
Pond 1P: Pond 1 Peak Elev=528.52' Storage=1.253 of Inflow=41.18 cfs 1.937 of
Primary=31.79 cfs 1.924 of Secondary=0.15 cfs 0.000 of Outflow=31.93 cfs 1.924 of
Total Runoff Area = 4.790 ac Runoff Volume =1.937 of Average Runoff Depth = 4.85"
72.94% Pervious = 3.494 ac 27.06% Impervious =1.296 ac
•
0
Pond-1-Post Type 1124-hr Eden 50 year Rainfal1=7.17"
Prepared by WSP SELLS Printed 8/29/2011
HydroCAD® 9.00 sln 04719 02009 HydroCAD Software Solutions LLC Page 29
Summary for Subcatchment DA1: Post
Runoff - 41.18 cfs a@ 11.96 hrs, Volume= 1.937 af, Depth= 4.85"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 50 year Rainfall=7.17'
Area (ac) CN Description
0.443 98 Paved parking, HSG C
0.853 98 Roofs, HSG C
3.494 74 >75% Grass cover, Good, HSG C
4.790 80 Weighted Average
3.494 72.94% Pervious Area
1.296 27.06% Impervious Area
Tc Length
•
5.0
28-
26.
24:
22- ;
1! 20
is
y Capacity Description
,) (cfs)
Direct Entry,
Subcatchment DA1: Post
Hydrograph
10 15 20 26 30 35 40 45 60 65 60 65
Time (hours)
Type 11 24-hr Eden
50 year
Rainfall=7.17"
.Runoff Area=4.790 ac
Runoff Volume=1.937 of
Runoff :Depth=4.85"
Tc=5.0 min
CN-90
110 115 120
0
Pond _1_Post Type 1124-hr Eden 50 year Rainfall=7.17"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Pace 30
Hydrograph for Subcatchment DA9: Post
•
•
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.12 0.00 0.00
3.00 0.25 0.00 0.00
4.50 0.40 0.00 0.00
6.00 0.57 0.00 0.03
7.50 0.78 0.03 0.13
9.00 1.05 0.10 0.35
10.50 1.46 0.27 0.82
12.00 4.75 2.68 34.86
13.50 5.73 3.54 1.52
15.00 6.12 3.89 0.96
16.50 6.39 4.13 0.69
18.00 6.60 4.33 0.58
19.50 6.78 4.49 0.46
21.00 6.92 4.62 0.40
22.50 7.05 4.74 0.38
24.00 7.17 4.85 0.35
25.50 7.17 4.85 0.00
27.00 7.17 4.65 0.00
28.50 7.17 4.85 0.00
30.00 7.17 4.85 0.00
31.50 7.17 4.85 0.00
33.00 7.17 4.85 0.00
34.50 7.17 4.85 0.00
36.00 7.17 4.85 0.00
37.50 7.17 4.85 0.00
39.00 7.17 4.85 0.00
40.50 7.17 4.85 0.00
42,00 7.17 4.85 0.00
43.50 7.17 4.85 0.00
45.00 7.17 4.85 0.00
46.50 7.17 4.85 0.00
48.00 7.17 4.85 0.00
49.50 7.17 4.85 0.00
51.00 7.17 4.85 0.00
52.50 7.17 4.85 0.00
54.00 7.17 4.85 0.00
55.50 7.17 4.85 0.00
57.00 7.17 4.85 0.00
58.50 7.17 4.85 0.00
60.00 7.17 4.85 0.00
61.50 7.17 4.85 0.00
63.00 7.17 4.85 0.00
64.50 7.17 4.85 0.00
66.00 7.17 4.85 0.00
67.50 7.17 4.85 0.00
69.00 7.17 4.85 0.00
70.50 7.17 4.85 0.00
72.00 7.17 4.85 0.00
73.50 7.17 4.85 0.00
75.00 7.17 4.85 0.00
76.50 7.17 4.85 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 7.17 4.85 0.00
79.50 7.17 4.85 0.00
81.00 7.17 4.85 0.00
82.50 7.17 4.85 0.00
84.00 7.17 4.85 0.00
85.50 7.17 4.85 0.00
87.00 7.17 4.85 0.00
88.50 7.17 4.85 0.00
90.00 7.17 4.85 0.00
91.50 7.17 4.85 0.00
93.00 7.17 4.85 0.00
94.50 7.17 4.85 0.00
96.00 7.17 4.85 0.00
97.50 7.17 4.85 0.00
99.00 7.17 4.85 0.00
100.50 7.17 4.85 0.00
102.00 7.17 4.85 0.00
103.50 7.17 4.85 0.00
105.00 7.17 4.85 0.00
106.50 7.17 4.85 0.00
108.00 7.17 4.85 0.00
109.50 7.17 4.85 0.00
111.00 7.17 4.85 0.00
112.50 7.17 4.85 0.00
114.00 7.17 4.85 0.00
115.50 7.17 4.85 0.00
117.00 7.17 4.85 0.00
118.50 7.17 4.85 0.00
120.00 7.17 4.85 0.00
Pond-1-Post Type 1l 24-hr Eden 50 year Rainfall=7.97"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 31
Summary for Pond 1 P: Pond 1
Inflow Area = 4.790 ac, 27.06% Impervious, Inflow Depth = 4.85" for Eden 50 year event
Inflow - 41.18 cfs @ 11.96 hrs, Volume= 1.937 of
Outflow = 31.93 cfs Q 12.01 hrs, Volume= 1.924 af, Atten= 22%, Lag= 3.0 min
Primary = 31.79 cfs @ 12.01 hrs, Volume= 1.924 of
Secondary = 0.15 cfs @ 12.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Starting Elev= 526.50' Surf.Area= 0.218 ac Storage= 0.693 of
Peak Elev= 528.52@ 12.01 hrs Surf.Area= 0.323 ac Storage= 1.253 of (0.560 of above start)
Plug-Flow detention time= 741.2 min calculated for 1.231 of (64% of inflow)
Center-of-Mass det. time= 376.7 min (1,179.7 - 803.0)
Volume Invert Avail.Storage Storage Description
#1 520.00' 1.809 of Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
520.00 0.031 0.000 0.000
521.00 0.045 0.038 0.038
522.00 0.071 0.058 0.096
523.00 0.100 0.085 0.181
524.00 0.124 0.112 0.293
525.00 0.150 0.137 0.430
526.00 0.178 0.164 0.594
526.50 0.218 0.099 0.693
527.00 0.262 0.120 0.813
528.00 0.297 0.279 1.092
529.00 0.348 0.322 1.415
530.00 0.441 0.394 1.809
Device Routing Invert Outlet Devices
#1 Primary 520.00' 30.0" Round 30" Dia. Culvert
L= 90.0' CMP, square edge headwall, Ke= 0.500
Outlet Invert= 518.10' S= 0.0211 '/' Cc= 0.900
n= 0.025 Corrugated metal
#2 Device 1 526.50' 1.5" Vert. 1.6" Orifice/Grate C= 0.600
#3 Device 1 527.50' 36.0" Horiz. 36" Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Seconda ry 528.50' 12.0' long x 18.0' 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
E
Pond 1 Post
Prepared by WSP SELLS
HydroCADO 9.00 s/n 04719 (
Type 11 24-hr Eden 50 year Rainfall=7.97"
Printed 6/29/2011
Primary OutFiow Max=31.43 cis @a 12.01 hrs HW=528.51' (Free Discharge)
=30" Dia. Culvert (Passes 31.43 cfs of 51.77 cfs potential flow)
2=1.5" Oriflce/Grate (Orifice Controls 0.08 cfs aQ 6.72 fps)
3=36" OrificelGrate (Weir Controls 31.34 cfs @ 3.29 fps)
econdary OutFlow Max=0.05 cis cG 12.00 hrs HW=528.51' (Free Discharge)
=Broad-Crested Rectangular Weir (Weir Controls 0.05 cfs a@ 0.32 fps)
Pond 1P: Pond 1
Hydrograph
Inflow
O Outflow
Primary
Secondary
LL
Time (hours)
0
Pond-1-Post Type 11 24-hr Eden 50 year Rainfall=7.17"
Prepared by WSP SELLS Printed 6/29/2011
. HydroCADS 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 33
Hydrograph for Pond 1 P: Pond 1
Time Inflow Storage Elevation Outflow Primary Secondary
(hours) (cfs) (acre-feet) (feet) (CIS) (cfs) _ (cfs)
0.00 0.00 0.693 526.50 0.00 0.00 0.00
3.00 0.00 0.693 526.50 0.00 0.00 0.00
6.00 0.03 0.694 526.50 0.00 0.00 0.00
9.00 0.35 0.729 526.66 0.02 0.02 0.00
12.00 34.86 1.252 628.52 31.77 31.62 0.15
15.00 0.96 0.976 527.60 1.01 1.01 0.00
18.00 0.58 0.964 527.56 0.60 0.60 0.00
21.00 0.40 0.958 527.54 0.41 0.41 0.00
24.00 0.35 0.957 527.53 0.36 0.36 0.00
27.00 0.00 0.938 527.46 0.06 0.06 0.00
30.00 0.00 0.924 527.41 0.05 0.05 0.00
33.00 0.00 0.911 527.36 0.05 0.05 0.00
36.00 0.00 0.898 527.32 0.05 0.05 0.00
39.00 0.00 0.885 527.27 0.05 0.05 0.00
42.00 0.00 0.873 527.23 0.05 0.05 0.00
45.00 0.00 0.861 527.18 0.05 0.05 0.00
48.00 0.00 0.850 527.14 0.04 0.04 0.00
51.00 0.00 0.839 527.10 0.04 0.04 0.00
54.00 0.00 0.829 527.06 0.04 0.04 0.00
57.00 0.00 0.819 527.02 0.04 0.04 0.00
60.00
63.00 0.00
0.00 0.809
0.800 526.98
526.95 0.04
0.04 0.04
0.04 0.00
0.00
66.00 0.00 0.791 526.91 0.03 0.03 0.00
69.00 0.00 0.782 526.88 0.03 0.03 0.00
72.00 0.00 0.774 526.85 0.03 0.03 0.00
75.00 0.00 0.767 526.82 0.03 0.03 0.00
78.00 0.00 0.759 526.79 0.03 0.03 0.00
81.00 0.00 0.753 526.76 0.03 0.03 0.00
84.00 0.00 0.747 526.73 0.02 0.02 0.00
87.00 0.00 0.741 526.71 0.02 0.02 0.00
90.00 0.00 0.735 526.69 0.02 0.02 0.00
93.00 0.00 0.731 526.67 0.02 0.02 0.00
96.00 0.00 0.726 526.65 0.02 0.02 0.00
99.00 0.00 0.722 526.63 0.01 0.01 0.00
102.00 0.00 0.719 526.62 0.01 0.01 0.00
105.00 0.00 0.716 526.60 0.01 0.01 0.00
108.00 0.00 0.713 526.59 0.01 0.01 0.00
111.00 0.00 0.711 526.58 0.01 0.01 0.00
114.00 0.00 0.709 526.57 0.01 0.01 0.00
117.00 0.00 0.707 526.56 0.01 0.01 0.00
120.00 0.00 0.705 526.55 0.01 0.01 0.00
0
Pond-1-Post Type 1l 24-hr Eden 50 year Rainfall=7.97"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Pane 34
Stage-Discharge for Pond 1 P: Pond 1
?J
•
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) _(cfs)
520.00 0.00 0.00 0.00
520.10 0.00 0.00 0.00
520.20 0.00 0.00 0.00
520.30 0.00 0.00 0.00
520.40 0.00 0.00 0.00
520.50 0.00 0.00 0.00
520.60 0.00 0.00 0.00
520.70 0.00 0.00 0.00
520.80 0.00 0.00 0.00
520.90 0.00 0.00 0.00
521.00 0.00 0.00 0.00
521.10 0.00 0.00 0.00
521.20 0.00 0.00 0.00
521.30 0.00 0.00 0.00
521.40 0.00 0.00 0.00
521.50 0.00 0.00 0.00
521.60 0.00 0.00 0.00
521.70 0.00 0.00 0.00
521.80 0.00 0.00 0.00
521.90 0.00 0.00 0.00
522.00 0.00 0.00 0.00
522.10 0.00 0.00 0.00
522.20 0.00 0.00 0.00
522.30 0.00 0.00 0.00
522.40 0.00 0.00 0.00
522.50 0.00 0.00 0.00
522.60 0.00 0.00 0.00
522.70 0.00 0.00 0.00
522.80 0.00 0.00 0.00
522.90 0.00 0.00 0.00
523.00 0.00 0.00 0.00
523.10 0.00 0.00 0.00
523.20 0.00 0.00 0.00
523.30 0.00 0.00 0.00
523.40 0.00 0.00 0.00
523.50 0.00 0.00 0.00
523.60 0.00 0.00 0.00
523.70 0.00 0.00 0.00
523.80 0.00 0.00 0.00
523.90 0.00 0.00 0.00
524.00 0.00 0.00 0.00
524.10 0.00 0.00 0.00
524.20 0.00 0.00 0.00
524.30 0.00 0.00 0.00
524.40 0.00 0.00 0.00
524.50 0.00 0.00 0.00
524.60 0.00 0.00 0.00
524.70 0.00 0.00 0.00
524.80 0.00 0.00 0.00
524.90 0.00 0.00 0.00
525.00 0.00 0.00 0.00
525.10 0.00 0.00 0.00
Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
525.20 0.00 0.00 0.00
525.30 0.00 0.00 0.00
525.40 0.00 0.00 0.00
525.50 0.00 0.00 0.00
525.60 0.00 0.00 0.00
525.70 0.00 0.00 0.00
525.80 0.00 0.00 0.00
525.90 0.00 0.00 0.00
526.00 0.00 0.00 0.00
526.10 0.00 0.00 0.00
526.20 0.00 0.00 0.00
526.30 0.00 0.00 0.00
526.40 0.00 0.00 0.00
526.50 0.00 0.00 0.00
526.60 0.01 0.01 0.00
526.70 0.02 0.02 0.00
526.80 0.03 0.03 0.00
526.90 0.03 0.03 0.00
527.00 0.04 0.04 0.00
527.10 0.04 0.04 0.00
527.20 0.05 0.05 0.00
527.30 0.05 0.05 0.00
527.40 0.05 0.05 0.00
527.50 0.06 0.06 0.00
527.60 1.03 1.03 0.00
527.70 2.82 2.82 0.00
527.80 5.13 5.13 0.00
527.90 7.87 7.87 0.00
528.00 10.97 10.97 0.00
528.10 14.40 14.40 0.00
528.20 18.13 18.13 0.00
528.30 22.13 22.13 0.00
528.40 26.39 26.39 0.00
528.50 30.90 30.90 0.00
528.60 36.66 35.64 1.02
528.70 40.25 37.37 2.88
528.80 44.20 38.89 5.30
528.90 48.56 40.36 8.20
529.00 53.23 41.78 11.46
529.10 58.20 43.15 15.06
529.20 63.24 44.47 18.76
529.30 68.43 45.76 22.67
529.40 74.01 47.01 27.00
529.50 79.79 48.23 31.56
529.60 85.90 49.42 36.48
529.70 92.23 50.59 41.64
529.80 98.68 51.72 46.96
529.90 105.31 52.83 52.48
530.00 112.01 53.92 58.09
•
Pond I Post
Prepared by WSP SELLS
HvdroCAD® 9.00 s/n 04719 ® 2009
Type 11 24-hr Eden 50 year Rainfall= 7.17"
Printed 6129/2011
Stage-Area-Storage for Pond 1 P: Pond 1
U
is
Elevation Surface Storage
(feet) (acres) (acre-feet)
520.00 0.031 0.000
520.10 0.032 0.003
520.20 0.034 0.006
520.30 0.035 0.010
520.40 0.037 0.014
520.50 0.038 0.017
520.60 0.039 0.021
520.70 0.041 0.025
520.80 0.042 0.029
520.90 0.043 0.033
521.00 0.045 0.038
521.10 0.047 0.042
521.20 0.050 0.047
521.30 0.053 0.052
521.40 0.055 0.058
521.50 0.058 0.063
521.60 0.060 0.069
521.70 0.063 0.076
521.80 0.066 0.082
521.90 0.068 0.089
522.00 0.071 0.096
522.10 0.074 0.103
522.20 0.077 0.110
522.30 0.080 0.118
522.40 0.083 0.126
522.50 0.085 0.135
522.60 0.088 0.143
522.70 0.091 0.152
522.80 0.094 0.162
522.90 0.097 0.171
523.00 0.100 0.181
523.10 0.103 0.191
523.20 0.105 0.202
523.30 0.107 0.212
523.40 0.110 0.223
523.50 0.112 0.234
523.60 0.114 0.245
523.70 0.117 0.257
523.80 0.119 0.269
523.90 0.122 0.281
524.00 0.124 0.293
524.10 0.127 0.306
524.20 0.129 0.318
524.30 0.132 0.332
524.40 0.134 0.345
524.50 0.137 0.358
524.60 0.140 0.372
524.70 0.142 0.386
524.80 0.145 0.401
524.90 0.147 0.415
525.00 0.150 0.430
525.10 0.153 0.445
Elevation Surface Storage
(feet) (acres) (acre-feet)
525.20 0.155 0.461
525.30 0.158 0.476
525.40 0.161 0.492
525.50 0.164 0.509
525.60 0.167 0.525
525.70 0.170 0.542
525.80 0.172 0.559
525.90 0.175 0.576
526.00 0.178 0.594
526.10 0.186 0.612
526.20 0.194 0.631
526.30 0.202 0.651
526.40 0.210 0.672
526.50 0.218 0.693
526.60 0.227 0.715
526.70 0.236 0.738
526.80 0.244 0.762
526.90 0.253 0.787
527.00 0.262 0.813
527.10 0.266 0.639
527.20 0.269 0.866
527.30 0.272 0.893
527.40 0.276 0.921
527.50 0.279 0.948
527.60 0.283 0.977
527.70 0.286 1.005
527.80 0.290 1.034
527.90 0.293 1.063
528.00 0.297 1.092
528.10 0.302 1.122
528.20 0.307 1.153
528.30 0.312 1.184
528.40 0.317 1.215
528.50 0.322 1.247
528.60 0.327 1.280
528.70 0.332 1.313
528.80 0.337 1.346
528.90 0.343 1.380
529.00 0.348 1.415
529.10 0.357 1.450
529.20 0.366 1.486
529.30 0.376 1.523
529.40 0.385 1.561
529.50 0.394 1.600
529.60 0.404 1.640
529.70 0.413 1.681
529.80 0.422 1.723
529.90 0.432 1.765
530.00 0.441 1.809
Pond 1_Post Type ll 24-hr Eden 100 year Rainfall=8.29"
Prepare_d by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Passe 36
Time span=0.00-120.00 hrs, dt=0.03 hrs, 4001 points
Runoff by SCS TR-20 method, UH=SCS
Reach routing by Star-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment DA1: Post Runoff Area=4.790 ac 27.06% Impervious Runoff Depth=5.82"
Tc=5.0 min CN=80 Runoff=48.89 cfs 2.324 of
Pond 1P: Pond 1 Peak Elev=528.66' Storage=1.299 of Inflow=48.89 cfs 2.324 of
Primary=36.64 cfs 2.299 of Secondary=2.09 cfs 0.013 of Outflow=38.73 cfs 2.312 of
Total Runoff Area = 4.790 ac Runoff Volume = 2.324 of Average Runoff Depth = 5.82"
72.94% Pervious = 3.494 ac 27.06% Impervious =1.296 ac
•
0
Pond-1-Post Type 1124-hr Eden 900 year Rainfall=8.29"
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Page 37
Summary for Subcatchment DA1: Post
Runoff - 48.89 cfs @ 11.96 hrs, Volume= 2.324 af, Depth= 5.82"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Type II 24-hr Eden 100 year Rainfall=8.21"
Area (ac) CN Description
0.443 98 Paved parking, HSG C
0.853 98 Roofs, HSG C
3.494 74 >75% Grass cover, Good, HSG C
4.790 80 Weighted Average
3.494 72.94% Pervious Area
1.296 27.06% Impervious Area
Tc Length Slope
5.0
Description
Direct Entry,
Subcatchment DA1: Post
Hydrograph
E
45-
40-
35-
30-
25.
0 5 10
Type II 24-hr Eden 100 year
Rainfall-8.21"
Runoff Area=4.790 ac
Runoff Volume=2.324 of
Runoff Dept. .82
Tc=5.0 min
CN=80
40 45 50 55 60 85
Time (hours)
100 105 110 115 120
Runoff
0
Pond_'i_Post Type 1124-hr Eden 100 year Rainfall=8.21 "
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD0 9.00 stn 04719 02009 HydroCAD Software Solutions LLC Page 38
Hydrograph for Subcatchment DA1: Post
•

Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
0.00 0.00 0.00 0.00
1.50 0.13 0.00 0.00
3.00 0.28 0.00 0.00
4.50 0.45 0.00 0.00
6.00 0.66 0.01 0.08
7.50 0.90 0.05 0.21
9.00 1.21 0.16 0.48
10.50 1.67 0.38 1.05
12.00 5.44 3.28 41.25
13.50 6.56 4.29 1.78
15.00 7.01 4.70 1.12
16.50 7.32 4.99 0.81
18.00 7.56 5.22 0.67
19.50 7.76 5.40 0.54
21.00 7.92 5.55 0.47
22.50 8.07 5.69 0.44
24.00 8.21 5.82 0.41
25.50 8.21 5.82 0.00
27.00 8.21 5.82 0.00
28.50 8.21 5.82 0.00
30.00 8.21 5.82 0.00
31.50 8.21 5.82 0.00
33.00 8.21 5.82 0.00
34.50 8.21 5.82 0.00
36.00 8.21 5.82 0.00
37.50 8.21 5.82 0.00
39.00 8.21 5.82 0.00
40.50 8.21 5.82 0.00
42.00 8.21 5.82 0.00
43.50 8.21 5.82 0.00
45.00 8.21 5.82 0.00
46.50 8.21 5.82 0.00
48.00 8.21 5.82 0.00
49.50 8.21 5.82 0.00
51.00 8.21 5.82 0.00
52.50 8.21 5.82 0.00
54.00 8.21 5.82 0.00
55.50 8.21 5.82 0.00
57.00 8.21 5.82 0.00
58.50 8.21 5.82 0.00
60.00 8.21 5.82 0.00
61.50 8.21 5.82 0.00
63.00 8.21 5.82 0.00
64.50 8.21 5.82 0.00
66.00 8.21 5.82 0.00
67.50 8.21 5.82 0.00
69.00 8.21 5.82 0.00
70.50 8.21 5.82 0.00
72.00 8.21 5.82 0.00
73.50 8.21 5.82 0.00
75.00 8.21 5.82 0.00
76.50 8.21 5.82 0.00
Time Precip. Excess Runoff
(hours) (inches) (inches) (cfs)
78.00 8.21 5.82 0.00
79.50 8.21 5.82 0.00
81.00 8.21 5.82 0.00
82.50 8.21 5.82 0.00
84.00 8.21 5.82 0.00
85.50 8.21 5.82 0.00
87.00 8.21 5.82 0.00
88.50 8.21 5.82 0.00
90.00 8.21 5.82 0.00
91.50 8.21 5.82 0.00
93.00 8.21 5.82 0.00
94.50 8.21 5.82 0.00
96.00 8.21 5.82 0.00
97.50 8.21 5.82 0.00
99.00 8.21 5.82 0.00
100.50 8.21 5.82 0.00
102.00 8.21 5.82 0.00
103.50 8.21 5.82 0.00
105.00 8.21 5.82 0.00
106.50 8.21 5.82 0.00
108.00 8.21 5.82 0.00
109.50 8.21 5.82 0.00
111.00 8.21 5.82 0.00
112.50 8.21 5.82 0.00
114.00 8.21 5.82 0.00
115.50 8.21 5.82 0.00
117.00 8.21 5.82 0.00
118.50 8.21 5.82 0.00
120.00 8.21 5.82 0.00
Pond-1-Post
• Prepared by WSP SELLS
HydroCADO 9.00 s/n 04719 0 2009
•
Type 11 24-hr Eden 900 year Rainfall=8.29"
Printed 6/29/2011
Summary for Pond 1 P: Pond 1
Inflow Area = 4.790 ac, 27.06% Impervious, Inflow Depth = 5.82" for Eden 100 year event
Inflow - 48.89 cfs @ 11.96 hrs, Volume= 2.324 of
Outflow - 38.73 cfs @ 12.01 hrs, Volume= 2.312 af, Atten= 21 %, Lag= 2.9 min
Primary = 36.64 cfs @ 12.01 hrs, Volume= 2.299 of
Secondary = 2.09 cfs @ 12.01 hrs, Volume= 0.013 of
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.03 hrs
Starting Elev= 526.50' Surf.Area= 0.218 ac Storage= 0.693 of
Peak Elev= 528.68'@ 12.01 hrs Surf.Area= 0.330 ac Storage= 1.299 of (0.606 of above start)
Plug-Flow detention time= 589.4 min calculated for 1.619 of (70% of inflow)
Center-of-Mass det. time= 318.8 min (1,116.7 - 797.9 )
Volume Invert Avail.Storage Storage Description
#1 520.00' 1.809 of Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (acres) (acre-feet) (acre-feet)
520.00 0.031 0.000 0.000
521.00 0.045 0.038 0.038
522.00 0.071 0.058 0.096
523.00 0.100 0.085 0.181
524.00 0.124 0.112 0.293
525.00 0.150 0.137 0.430
526.00 0.178 0.164 0.594
526.50 0.218 0.099 0.693
527.00 0.262 0.120 0.813
528.00 0.297 0.279 1.092
529.00 0.348 0.322 1.415
530.00 0.441 0.394 1.809
Device Routing Invert Outlet Devices
#1 Primary 520.00' 30.0" Round 30" Dia. Culvert
L= 90.0' CMP, square edge headwall, Ke= 0.500
Outlet Invert= 518.10' S= 0.02117 Cc= 0.900
n= 0.025 Corrugated metal
#2 Device 1 526.50' 1.5" Vert. 1.6" Orifice/Grate C= 0.600
#3 Device 1 527.50' 36.0" Horiz. 36" Orifice/Grate C= 0.600
Limited to weir flow at low heads
#4 Seconda ry 528.50' 12.0' long x 18.0' 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
0
Pond-1-Post Type 1124-hr Eden 100 year Rainfall=8.21"
Prepared by WSP SELLS Printed 6/29/2011
HydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 40
rimary OutFlow Max=36.61 cfs @ 12.01 hrs HW=528.65' (Free Discharge)
0" Dia. Culvert (Passes 36.61 cfs of 52.22 cfs potential flow)
T32
=1
.5" Orifice/Grate (Orifice Controls 0.09 cfs @ 6.96 fps)
3=36" Orifice/Grate (Orifice Controls 36.52 cfs @ 5.17 fps)
econdary OutFlow Max=1.90 cfs @ 12.01 hrs HW=528.65' (Free Discharge)
=Broad-Crested Rectangular Weir (Weir Controls 1.90 cfs @ 1.04 fps)
Pond 1 P: Pond 1
Hydrograph
M Inflow
? Outflow
® Primary
M Secondary

Time (hours)
0
Pond-1-Post Type 1124-hr Eden 900 year Rainfall=8.29"
Prepared by WSP SELLS Printed 6/29/2011
HydroCADO 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Page 41
Hydrograph for Pond 1 P: Pond 1
Time Inflow Storage Elevation Outflow
0.00 0.00 0.693 526.50 0.00 0.00 0.00
3.00 0.00 0.693 526.50 0.00 0.00 0.00
6.00 0.08 0.696 526.51 0.00 0.00 0.00
9.00 0.48 0.749 526.75 0.03 0.03 0.00
12.00 41.25 1.298 528.66 38.67 36.61 2.06
15.00 1.12 0.979 527.61 1.17 1.17 0.00
18.00 0.67 0.967 527.57 0.70 0.70 0.00
21.00 0.47 0.960 527.54 0.47 0.47 0.00
24.00 0.41 0.959 527.54 0.42 0.42 0.00
27.00 0.00 0.938 527.46 0.06 0.06 0.00
30.00 0.00 0.924 527.41 0.05 0.05 0.00
33.00 0.00 0.911 527.36 0.05 0.05 0.00
36.00 0.00 0.898 527.32 0.05 0.05 0.00
39.00 0.00 0.886 527.27 0.05 0.05 0.00
42.00 0.00 0.873 527.23 0.05 0.05 0.00
45.00 0.00 0.862 527.18 0.05 0.05 0.00
48.00 0.00 0.850 527.14 0.04 0.04 0.00
51.00 0.00 0.839 527.10 0.04 0.04 0.00
54.00 0.00 0.829 527.06 0.04 0.04 0.00
57.00 0.00 0.819 527.02 0.04 0.04 0.00
60.00
63.00 0.00
0.00 0.809
0.800 526.98
526.95 0.04
0.04 0.04
0.04 0.00
0.00
66.00 0.00 0.791 526.91 0.03 0.03 0.00
69.00 0.00 0.782 526.88 0.03 0.03 0.00
72.00 0.00 0.774 526.85 0.03 0.03 0.00
75.00 0.00 0.767 526.82 0.03 0.03 0.00
78.00 0.00 0.760 526.79 0.03 0.03 0.00
81.00 0.00 0.753 526.76 0.03 0.03 0.00
84.00 0.00 0.747 526.73 0.02 0.02 0.00
87.00 0.00 0.741 526.71 0.02 0.02 0.00
90.00 0.00 0.735 526.69 0.02 0.02 0.00
93.00 0.00 0.731 526.67 0.02 0.02 0.00
96.00 0.00 0.726 526.65 0.02 0.02 0.00
99.00 0.00 0.723 526.63 0.01 0.01 0.00
102.00 0.00 0.719 526.62 0.01 0.01 0.00
105.00 0.00 0.716 526.60 0.01 0.01 0.00
108.00 0.00 0.713 526.59 0.01 0.01 0.00
111.00 0.00 0.711 526.58 0.01 0.01 0.00
114.00 0.00 0.709 526.57 0.01 0.01 0.00
117.00 0.00 0.707 526.56 0.01 0.01 0.00
120.00 0.00 0.705 526.55 0.01 0.01 0.00
0
Pond-1-Post Type 11 24-hr Eden 100 year Rainfall=8.21 "
Prepared by WSP SELLS Printed 6/29/2011
HydroCAD® 9.00 s/n 04719 ® 2009 HydroCAD Software Solutions LLC Pace 42
Stage-Discharge for Pond 1 P: Pond 1
•

Elevation Discharge Primary Secondary
(feet) (cfs) (cfs) (cfs)
520.00 0.00 0.00 0.00
520.10 0.00 0.00 0.00
520.20 0.00 0.00 0.00
520.30 0.00 0.00 0.00
520.40 0.00 0.00 0.00
520.50 0.00 0.00 0.00
520.60 0.00 0.00 0.00
520.70 0.00 0.00 0.00
520.80 0.00 0.00 0.00
520.90 0.00 0.00 0.00
521.00 0.00 0.00 0.00
521.10 0.00 0.00 0.00
521.20 0.00 0.00 0.00
521.30 0.00 0.00 0.00
521.40 0.00 0.00 0.00
521.50 0.00 0.00 0.00
521.60 0.00 0.00 0.00
521.70 0.00 0.00 0.00
521.80 0.00 0.00 0.00
521.90 0.00 0.00 0.00
522.00 0.00 0.00 0.00
522.10 0.00 0.00 0.00
522.20 0.00 0.00 0.00
522.30 0.00 0.00 0.00
522.40 0.00 0.00 0.00
522.50 0.00 0.00 0.00
522.60 0.00 0.00 0.00
522.70 0.00 0.00 0.00
522.80 0.00 0.00 0.00
522.90 0.00 0.00 0.00
523.00 0.00 0.00 0.00
523.10 0.00 0.00 0.00
523.20 0.00 0.00 0.00
523.30 0.00 0.00 0.00
523.40 0.00 0.00 0.00
523.50 0.00 0.00 0.00
523.60 0.00 0.00 0.00
523.70 0.00 0.00 0.00
523.80 0.00 0.00 0.00
523.90 0.00 0.00 0.00
524.00 0.00 0.00 0.00
524.10 0.00 0.00 0.00
524.20 0.00 0.00 0.00
524.30 0.00 0.00 0.00
524.40 0.00 0.00 0.00
524.50 0.00 0.00 0.00
524.60 0.00 0.00 0.00
524.70 0.00 0.00 0.00
524.80 0.00 0.00 0.00
524.90 0.00 0.00 0.00
525.00 0.00 0.00 0.00
525.10 0.00 0.00 0.00
Elevation Discharge Primary Secondary
(feet) Ws) (cfs) (cfs)
525.20 0.00 0.00 0.00
525.30 0.00 0.00 0.00
525.40 0.00 0.00 0.00
525.50 0.00 0.00 0.00
525.60 0.00 0.00 0.00
525.70 0.00 0.00 0.00
525.80 0.00 0.00 0.00
525.90 0.00 0.00 0.00
526.00 0.00 0.00 0.00
526.10 0.00 0.00 0.00
526.20 0.00 0.00 0.00
526.30 0.00 0.00 0.00
526.40 0.00 0.00 0.00
526.50 0.00 0.00 0.00
526.60 0.01 0.01 0.00
526.70 0.02 0.02 0.00
526.80 0.03 0.03 0.00
526.90 0.03 0.03 0.00
527.00 0.04 0.04 0.00
527.10 0.04 0.04 0.00
527.20 0.05 0.05 0.00
527.30 0.05 0.05 0.00
527.40 0.05 0.05 0.00
527.50 0.06 0.06 0.00
527.60 1.03 1.03 0.00
527.70 2.82 2.82 0.00
527.80 5.13 5.13 0.00
527.90 7.87 7.87 0.00
528.00 10.97 10.97 0.00
528.10 14.40 14.40 0.00
528.20 18.13 18.13 0.00
528.30 22.13 22.13 0.00
528.40 26.39 26.39 0.00
528.50 30.90 30.90 0.00
528.60 36.66 35.64 1.02
528.70 40.25 37.37 2.68
528.80 44.20 38.89 5.30
528.90 48.56 40.36 8.20
529.00 53.23 41.78 11.46
529.10 58.20 43.15 15.06
529.20 63.24 44.47 18.76
529.30 68.43 45.76 22.67
529.40 74.01 47.01 27.00
529.50 79.79 48.23 31.56
529.60 85.90 49.42 36.48
529.70 92.23 50.59 41.64
529.80 98.68 51.72 46.96
529.90 105.31 52.83 52.48
530.00 112.01 53.92 68.09
Pond-1-Post Type 11 24-hr Eden 100 year Rainfall=8.29"
Prepared by WSP SELLS Printed 6/29/2011
is HydroCAD® 9.00 s/n 04719 02009 HydroCAD Software Solutions LLC Pane 43
Stage-Area-Storage for Pond 1 P: Pond 1
•
•
Elevation Surface Storage
(feet) (acres) (acre-feet)
520.00 0.031 0.000
520.10 0.032 0.003
520.20 0.034 0.006
520.30 0.035 0.010
520.40 0.037 0.014
520.50 0.038 0.017
520.60 0.039 0.021
520.70 0.041 0.025
520.80 0.042 0.029
520.90 0.043 0.033
521.00 0.045 0.038
521.10 0.047 0.042
521.20 0.050 0.047
521.30 0.053 0.052
521.40 0.055 0.058
521.50 0.058 0.063
521.60 0.060 0.069
521.70 0.063 0.076
521.80 0.066 0.082
521.90 0.068 0.089
522.00 0.071 0.096
522.10 0.074 0.103
522.20 0.077 0.110
522.30 0.080 0.118
522.40 0.083 0.126
522.50 0.085 0.135
522.60 0.088 0.143
522.70 0.091 0.152
522.80 0.094 0.162
522.90 0.097 0.171
523.00 0.100 0.181
523.10 0.103 0.191
523.20 0.105 0.202
523.30 0.107 0.212
523.40 0.110 0.223
523.50 0.112 0.234
523.60 0.114 0.245
523.70 0.117 0.257
523.80 0.119 0.269
523.90 0.122 0.281
524.00 0.124 0.293
524.10 0.127 0.306
524.20 0.129 0.318
524.30 0.132 0.332
524.40 0.134 0.345
524.50 0.137 0.358
524.60 0.140 0.372
524.70 0.142 0.386
524.80 0.145 0.401
524.90 0.147 0.415
525.00 0.150 0.430
525.10 0.153 0.445
Elevation Surface Storage
(feet) (acres) (acre-feet)
525.20 0.155 0.461
525.30 0.158 0.476
525.40 0.161 0.492
525.50 0.164 0.509
525.60 0.167 0.525
525.70 0.170 0.542
525.80 0.172 0.559
525.90 0.175 0.576
526.00 0.178 0.594
526.10 0.186 0.612
526.20 0.194 0.631
526.30 0.202 0.651
526.40 0.210 0.672
526.50 0.218 0.693
526.60 0.227 0.715
526.70 0.236 0.738
526.80 0.244 0.762
526.90 0.253 0.787
527.00 0.262 0.813
527.10 0.266 0.839
527.20 0.269 0.866
527.30 0.272 0.893
527.40 0.276 0.921
527.50 0.279 0.948
527.60 0.283 0.977
527.70 0.286 1.005
527.80 0.290 1.034
527.90 0.293 1.063
528.00 0.297 1.092
528.10 0.302 1.122
528.20 0.307 1.153
528.30 0.312 1.184
528.40 0.317 1.215
528.50 0.322 1.247
528.60 0.327 1.280
528.70 0.332 1.313
528.80 0.337 1.346
528.90 0.343 1.380
529.00 0.348 1.415
529.10 0.357 1.450
529.20 0.366 1.486
529.30 0.376 1.523
529.40 0.385 1.561
529.50 0.394 1.600
529.60 0.404 1.640
529.70 0.413 1.681
529.80 0.422 1.723
529.90 0.432 1.765
530.00 0.441 1.809
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