20110593 Ver 1_401 Application_20110611

Confluence Engineering, PC
16 Broad Street
Asheville, NC 28801
828.255.5530
June 21, 2011
Mr. Ian McMillan 2 G 1 1 0 5 9 3
NC Division of Water Quality
1650 Mail Service Center
Raleigh, NC 27699-1650
Subject: NWP Application
Stormwater Wetland at Van Wingerden International, Inc.
Mills River, Henderson County, North Carolina
Dear Mr. McMillan:
Enclosed please find five copies of design plans and a PCN for a proposed stormwater wetland pond
conversion project in Mills River. A check for the review fee is also enclosed, along with an agent
authorization letter.
If you have any questions, please call me at [phone], extension 22.
Sincerely,
Confluence Engineering, PC
Andrew Bick, PE
Principal
Enclosures
OF WATF'9
150 QG Office Use only:
> Corps action ID no.
2 0 1 1 0 5 9 3 DWQ project no.
Form Version 1.3 Dec 10 2008
Pre-Construction Notification PCN Form
1. Processing A. Applicant Information
1 a. Type(s) of approval sought from the
Corps: ® Section 404 Permit ? Section 10 Permit
1 b. Specify Nationwide Permit (NWP) number: 27 or General Permit (GP) number:
1c. Has the NWP or GP number been verified by the Corps?
® Yes ? No
1 d. Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification - Regular ? Non-404 Jurisdictional General Permit
? 401 Water Quality Certification - Express ? Riparian Buffer Authorization
1 e. Is this notification solely for the record For the record only for DWQ 401
because written approval is not required? Certification:
? Yes ? No
if. Is payment into a mitigation bank or in-lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in-lieu
fee program.
For the record only for Corps Permit:
? Yes ® No
? Yes
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h ? Yes
below.
111. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes
2. Project Information
2a. Name of project:
_ Van Wingerden Stormwater Wetland Retrofit
2b.
EE
County: Henderson
2c. Nearest mu
wn: Mills River
2d. Subdivision name: NA
2e. NCDOT only, T.I.P. or state
project no:
3. Owner information
3a. Name(s) on Recorded Deed: Van Wingerden International, Inc.
3b. Deed Book and Page No. 537/649
3c. Responsible Party (for LLC if
ar)r) cable) Bert Lemkes
3d. Street address: 4112 Haywood Rd.
3e. City, state, zip: Mills River, NC 28759
3f. Telephone no.: [phone]
3g. Fax no.: NA
3h. Email address: [e-mail]
® No
® No
® No
JUN 2 2 2011
Page I of 11
PCN Form - Version 1.3 December 10, 2008 Version
4. Applicant Information (if different from owner)
4a. Applicant is: ® Agent ? Other, specify:
4b. Name:
4c. Business name
(if applicable):
4d. Street address:
4e. City, state, zip:
4f. Telephone no.:
4g. Fax no.:
4h. Email address:
6. Agent/Consultant Information (if applicable)
5a. Name: Andrew Bick
5b. Business name
(if applicable): Confluence Engineering, PC
5c. Street address: 16 Broad Street
5d. City, state, zip: Asheville, NC 28801
5e. Telephone no.: 828.255.5530
5f. Fax no.: same
5g. Email address: [e-mail]
Page 2 of 11
PCN Form -Version 1.3 December 10, 2008 Version

B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID):
1 b. Site coordinates (in decimal degrees):
1c. Property size:
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to
proposed project:
9641021794
Latitude: 35.382750
82.556961
(DD.DDDDDD)
18.4 acres
Longitude: -
(-DD.DDDDDD)
Unamed Tributary to Mills River
2b. Water Quality Classification of nearest receiving water: WS-IV
2c. River basin: French Broad
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
Runoff from the existing 28 acres of greenhouse roofs and other impervious surfaces flows to two outfalls which empty
into an existing 1.7 acre retention pond before discharging to an unnamed tributary to the Mills River. The pond is
shallow and provides little shading, two factors which contribute to elevated water temperatures, particularly during
summer months. The outlet structure offers little temporary storage and is set such that effluent discharges from the top
of the water column where the warmest water is present. Frequent warm water discharges may be harming fish habitats
in the Mills River, which supports trout less than one mile upstream of the site.
3b. List the total estimated acreage of all existing wetlands on the property:
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
350
3d. Explain the purpose of the proposed project:
The purpose of the project is to convert the retention pond to a stormwater wetland and improve water quality by slowing
runoff, promoting infiltration and providing shade to surface waters. The primary targeted pollutant is elevated
temperature, and we are also proposing to address atmospheric nitrogen and pollutants adsorbed onto sediments in
runoff. The proposed wetland will also reduce the frequency and velocity of stormwater discharges to the receiving
tributary by detaining common small rainfall events and releasing the runoff over an extended period.
3e. Describe the overall project in detail, including the type of equipment to be used:
The existing pond footprint will be graded and shaped to form a sinuous low-flow channel meandering through low marsh,
high marsh and deep pool areas. The existing culvert outlet will be replaced with a new flashboard riser structure with a
low-flow orifice to draw storm flows down over a 2 to 3 day period. High flows will be routed through the top of the outlet
structure or over an emergency spillway at the pond crest. The outlet configuration will employ a turn-down inlet pipe to
discharge the coolest water from near the bottom of the micro pool near the outlet structure.
Conventional construction equipment, including a track-mounted excavator, dump truck and assorted hand tools, will be
used to install the project elements. Work will take place from both top of bank and within the drained pond. Equipment
access to the pond bottom will be required for grading of the flow channels and pools as well as installing the outlet
structure, a new outfall and three riprap aprons.
Page 3 of 11
PCN Form - Version 1.3 December 10, 2008 Version

4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (including all prior phases) in the past?
Comments:
® Yes ? No ? Unknown
4b. If the Corps made the jurisdictional determination, what type
of determination was made?
®Preliminary ? Final

4c.
If yes, who delineated the jurisdictional areas?
Name (if known): Agency/ Consultant Company:

Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
5. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past? ? Yes ® No ? Unknown
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project? ? Yes ® No
6b. If yes, explain.
Page 4 of 11
PCN Form - Version 1.3 December 10, 2008 Version

C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
? Wetlands ? Streams - tributaries
? Buffers
? Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d.
2f.
Wetland impact 2e. Type of jurisdiction
number - Type of impact Type of wetland Forested
Permanent (P) or (Corps - 404, 10 Area of impact
(if known) DWQ - non-404, other) (acres)
Temporary (T)
W1 ? P ? T ? Yes ? Corps
? No ? DWQ
W2 ? P ? T ? Yes ? Corps
? No ? DWQ
W3 ? P ? T ? Yes ? Corps
? No ? DWQ
W4 ? PDT ? Yes ? Corps
? No ? DWQ
W5 ? P ? T ? Yes ? Corps
? No ? DWQ
W6 ? P ? T ? Yes ? Corps

2g. Total wetland im
pacts ? No ?DWQ
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d.
Stream impact Type of impact Stream name Perennial T3e. 3f. 3g.
ype of jurisdiction Average Impact
number - or
Permanent or (PER) (Corps - 404, 10 stream length
Temporary (T) intermittent p?/Q _ non-404, width (linear

S1 ? P ? T (1 NT) .

? PER other

? Corps
(feet)
feet)
? INT ? pWQ
S2 ? P ? T ? PER ? Corps
? INT ? DWQ
S3 ? P ? T ? PER ? Corps
? INT ? DWQ
S4 ? P ? T ? PER ? Corps
? INT ? pWQ
S5 ? P ? T ? PER
? Corps
? INT ? pWQ
S6 ? P ? T ? PER
? Corps

3h. Total stream and tributary impacts
INT
?
? DWQ

3i. Comments:
Page 5 of 11
PCN Form - Version 1.3 December 10, 2008 Version
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individually list all open water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of waterbody
impact number - (if applicable) Type of impact Waterbody type Area of impact (acres)
Permanent (P) or
Temporary T
01 ®P ? T n/a conversion to sw wetland pond 1.7
02 ?P?T
03 ?P?T
04 ?P?T
4f. Total open water impacts 1.7
4g. Comments:
5. Pond or Lake Construction
If and or lake construction proposed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.
Pond ID
number
Proposed use or purpose
of pond
Wetland impacts (acres)
Stream Impacts (feet)
Flooded I Filled I Excavated I Flooded I Filled I Excavated
Upland
(acres)
Flooded
P1
P2
5f. Total
5g. Comments:
5h. Is a dam high hazard permit required?
? Yes ? No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then you MUST fill out Section D of this form.
6a.
Project is in which protected basin?
6b. 6c. 6d.
Buffer impact
number - Reason
Permanent (P) or for
Temporarv (T) impact
B1 ?P?T
B2 ?P?T
B3 ?P?T
6i. Comments:
? Neuse ? Tar-Pamlico ? Other:
? Catawba ? Randleman
6e. 6f. 6g.
Buffer
Stream name mitigation
required?
? Yes
? No
? Yes
? No
? Yes
? No
6h. Total buffer impacts
Zone 1 impact Zone 2 impact
(square feet) (square feet)
Page 6 of 11
PCN Form -Version 1.3 December 10, 2008 Version
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The project represents a net benefit to water quality and habitat in the Mills River watershed by slowing runoff, promoting
infiltration and reducing thermal and chemical pollution. Construction phase best management practices will help minimize the
short-term impacts.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Erosion and sediment control practices will be installed as indicated on the attached plans and maintained during the
construction phase. These practices will.include a stone construction exit, silt fence around all stockpile and staging areas,
rock pipe inlet protection at the outlet culverts, seeding, mulching and matting. The contractor will be required to follow the
construction sequence and will be instructed to stabilize all disturbed areas before leaving the site each day. The contract
documents will require well maintained and functioning equiptment and daily checks for leaks. An emergency spill plan will
also be required.
2. Compensatory Mitigation for impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for
impacts to Waters of the U.S. or Waters of the State?
? Yes ® No
2b. If yes, mitigation is required by (check all that apply):
2c. If yes, which mitigation option will be used for this
project?
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank:
3b. Credits Purchased (attach receipt and letter)
3c. Comments:
? DWQ ? Corps
? Mitigation bank
? Payment to in-lieu fee program
? Permittee Responsible Mitigation
Type
4. Complete if Making a Payment to-In-lieu Fee Program
4a. Approval letter from in-lieu fee program is attached. ? Yes
4b. Stream mitigation requested: linear feet
4c. If using stream mitigation, stream temperature: ? warm
? cool
4d. Buffer mitigation requested (DWQ only): square feet
4e. Riparian wetland mitigation requested: acres
4f. Non-riparian wetland mitigation requested: acres
4g. Coastal (tidal) wetland mitigation requested: acres
4h. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
Quantity
?cold
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
Page 7 of 11
PCN Form - Version 1.3 December 10, 2008 Version

6. Buffer Mitigation (State Regulated Riparian Buffer Rules) - required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation? ? Yes ® No
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.

Zone 6c.
Reason for impact 6d.
Total impact
(square feet)
Multiplier 6e.
Required mitigation
(square feet)
Zone 1 3 (2 for Catawba)
Zone 2 1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in-lieu fee fund).
6h. Comments:
Page 8 of 11
PCN Form - Version 1.3 December 10, 2008 Version
E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
1a . Does the project include or is it adjacent to protected riparian buffers identified ? Yes ® No
within one of the NC Riparian Buffer Protection Rules?
1 b . If yes, then is a diffuse flow plan included? If no, explain why.
Comments: ? Yes ? No
2. Stormwater Management Plan
2a . What is the overall percent imperviousness of this project? n/a %
2b . Does this project require a Stormwater Management Plan? ? Yes ® No
2c. If this project DOES NOT require a Stormwater Management Plan, explain why: Project does not constitute development
or an increase in impervious area.
2d . If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
? Certified Local Government
2e. Who will be responsible for the review of the Stormwater Management Plan? ? DWQ Stormwater Program
? DWQ 401 Unit
3. Certified Local Government Stormwater Review
3a. In which local government's jurisdiction is this project?
? Phase II
3b. Which of the following locally-implemented stormwater management programs ? NSW
? USMP
apply (check all that apply): ? Water Supply Watershed
? Other:
3c. Has the approved Stormwater Management Plan with proof of approval been ? Yes ? No
attached?
4. DWQ Stormwater Program Review
? Coastal counties

4a.
Which of the following state-implemented stormwater management programs apply ? HQW
? ORW
(check all that apply): ? Session Law 2006-246
? Other:
4b. Has the approved Stormwater Management Plan with proof of approval been
attached? ? Yes ? No
6. DWQ 401 Unit Stormwater Review
5a. Does the Stormwater Management Plan meet the appropriate requirements? ? Yes ? No
5b. Have all of the 401 Unit submittal requirements been met? ? Yes ? No
Page 9 of 11
PCN Form - Version 1.3 December 10, 2008 Version
F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1 a. Does the project involve an expenditure of public (federal/state/local) funds or the ® Yes ? No
use of public (federal/state) land?
1 b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State ? Yes ® No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c. If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
letter.) ? Yes ® No
Comments:
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ? Yes ® No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b. Is this an after-the-fact permit application? ? Yes ® No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3. Cumulative Impacts (DWQ Requirement)
3a. Will this project (based on past and reasonably anticipated future impacts) result in ? Yes ® No
additional development, which could impact nearby downstream water quality?
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
4. Sewage Disposal (DWQ Requirement)
4a. Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
Page 10 of 11
PCN Form - Version 1.3 December 10, 2008 Version
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or
h
i ® Yes No
?
ab
tat?
5b. Have you checked with the USFWS concerning Endangered Species Act
i ? Yes ® No
mpacts?

5c. If yes, indicate the USFWS Field Office you have contacted ? Raleigh
.
? Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Desi
nated Criti
l
g
ca
Habitat?
NC One Map website
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat? ? Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
NC One Map website
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
t
t
N ? Yes ® No
s
a
us (e.g.,
ational Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
NC One Map website
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain? ? Yes ® No
8b. If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination?
Andrew Bick 6/21/11

Applicant/Agent's Printed Name Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant
is rovided.
Page 11 of 11
PCN Form - Version 1.3 December 10,.2008 Version
*** VAN WI
?o inTrr.v,,
??
June 10, 2011
Mr. Tyler Crumbley
US Army Corps of Engineers
Asheville Regulatory Field Office
151 Patton Avenue, Room 208
Asheville, NC 28801
NGER,gEN'
fIONAL.INC.
Subject: NWP Application Agent Authorization
Stormwater Wetland at Van Wingerden International
Mills River, Henderson County, North Carolina
Dear Mr. Crumbley:
I hereby authorize Andrew Bick of Confluence Engineering. PC to serve as our agent and apply
on our behalf for a Nationwide Permit for the subject project.
If you have any questions, please call me at [phone].
Sincerely. _
Van Ningerden International. Inc.
('iier't4-' kes. president

r
groweCS Cratu:"f''i HC.'rlt:l*'C'
SUPPORTING DATA
• STORMWATER WETLAND CALCULATIONS
• RIPRAP APRON CALCULATIONS
• SITE PHOTOGRAPHS
PREPARED BY:
CONFLUENCE ENGINEERING, PC
16 BROAD STREET
ASHEVILLE, NC 28801
[phone]
}
VW wetland rev Type // 24-hr 1 inch Rainfall=1.00"
Prepared by Confluence Engineering Printed 6/21/2011
HydroCADO 8.50 s/n 005856 © 2007 HydroCAD Software Solutions LLC
Pond 7P: Design Wetland
Hydrograph
w
3
0
0.00
3 0.64 cfs ¦ inflow
Outflow
Inflow Area=28
109 ac
0 Primary
. 0 Secondary
Peak Elev=2,078.41'
Storage=68,131 cf
0.33 cfs
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
Time (hours)
VW wetland rev
Prepared by Confluence Engin
HydroCADO 8.50 s/n 005856 0 201
Software
Type// 24-hr 1 inch Rainfall=1.00"
Printed 6/21/2011
Summary for Pond 7P: Design Wetland
[80] Warning: Exceeded Pond 8P by 1.09'@ 25.10 hrs (2.15 cfs 3.488 af)
Inflow Area = 28.109 ac,100.00% Impervious, Inflow Depth = 0.77" for 1 inch event
Inflow = 30.64 cfs @ 12.00 hrs, Volume= 1.813 of
Outflow = 0.33 cfs @ 20.08 hrs, Volume= 1.162 af, Atten= 99%, Lag= 484.9 min
Primary = 0.33 cfs @ 20.08 hrs, Volume= 1.162 of
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-144.00 hrs, dt= 0.05 hrs
Peak Elev= 2,078.41' @ 20.08 hrs Surf.Area= 65,616 sf Storage= 68,131 cf
Plug-Flow detention time= 3,135.9 min calculated for 1.161 of (64% of inflow)
Center-of-Mass det. time= 3,040.9 min ( 3,823.3 - 782.4 )
Volume Invert Avail.Stora a Storage Description
#1 2,075.00' 323,685 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
2,075.00 7,500 0.0 0 0
2,077.00 29,300 0.0 0 0
2,077.30 29,300 0.0 0 0
2,077.40 60,000 100.0 4,465 4,465
2,078.00 64,400 100.0 37,320 41,785
2,079.00 67,400 100.0 65,900 107,685
2,081.00 73,500 100.0 140,900 248,585
2,082.00 76,700 100.0 75,100 323,685
Device Routing Invert Outlet Devices
#1 Primary 2,077.00' 12.0" x 70.0' long Culvert CPP, square edge headwall, Ke= 0.500
Outlet Invert= 2,076.60' S= 0.00577' Cc= 0.900
n= 0.012 Concrete pipe, finished
#2 Device 1 2,077.30' 2.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 2,078.30' 2.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
#4 Device 1 2,080.00' 2.00' x 2.00' Horiz. Orifice/Grate Limited to weir flow C=0.600
#5 Secondary 2,081.00' 10.0' long x 2.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
2.50 3.00 3.50
Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88
2.85 3.07 3.20 3.32
Primary OutFlow Max=0.33 cfs @ 20.08 hrs HW=2,078.41' (Free Discharge)
t-,=Culvert (Passes 0.33 cfs of 3.08 cfs potential flow)
2=Orifice/Grate (Orifice Controls 0.11 cfs @ 4.87 fps)
3=Sharp-Crested Rectangular Weir (Weir Controls 0.22 cfs @ 1.06 fps)
=Orifice/Grate ( Controls 0.00 cfs)
M ndary OutFlow Max=0.00 cfs @ 0.00 hrs HW=2,075.00' (Free Discharge)
Broad-Crested Rectangular Weir( Controls 0.00 cfs)
4,116
VW wetland rev Type// 24-hr 10 year Rainfall=5.59"
Prepared by Confluence Engineering Printed 6/21/2011
HydroCADO 8.50 s/n 005856 © 2007 HydrOCAD Software Solutions LLC
Pond 7P: Design Wetland
Hydrograph
¦ Inflow
0 Outflow
¦ Primary
E3 Secondary
a
v
3
0
U.

% It
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
Time (hours)
A ? .
VW wetland rev Type 1124-hr 10 year Rainfall=5.59"
Prepared by Confluence Engineering Printed 6/21/2011
HydroCADO 8.50 s/n 005856 © 2007 HydroCAD Software Solutions LLC
Summary for Pond 7P: Design Wetland
[80] Warning: Exceeded Pond 8P by 3.06'@ 12.75 hrs (5.86 cfs 9.903 af)
Inflow Area = 28.109 ac, 100.00% Impervious, Inflow Depth = 4.91" for 10 year event
Inflow = 177.69 cfs @ 12.00 hrs, Volume= 11.511 of
Outflow = 22.94 cfs @ 12.37 hrs, Volume= 10.792 af, Atten= 87%, Lag= 22.4 min
Primary = 6.97 cfs @ 12.37 hrs, Volume= 9.078 of
Secondary = 15.97 cfs @ 12.37 hrs, Volume= 1.714 of
Routing by Dyn-Stor-Ind method, Time Span= 0.00-144.00 hrs, dt= 0.05 hrs
Peak Elev= 2,081.72' @ 12.37 hrs Surf.Area= 75,810 sf Storage= 302,477 cf
Plug-Flow detention time= 694.8 min calculated for 10.788 of (94% of inflow)
Center-of-Mass det. time= 660.2 min ( 1,401.2 - 740.9 )
Volume Invert Avail.Storage Storage Description
#1 2,075.00' 323,685 cf Custom Stage Data (Prismatic)Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
2,075.00 7,500 0.0 0 0
2,077.00 29,300 0.0 0 0
2,077.30 29,300 0.0 0 0
2,077.40 60,000 100.0 4,465 4,465
2,078.00 64,400 100.0 37,320 41,785
2,079.00 67,400 100.0 65,900 107,685
2,081.00 73,500 100.0 140,900 248,585
2,082.00 76,700 100.0 75,100 323,685
Device Routing Invert Outlet Devices
#1 Primary 2,077.00' 12.0" x 70.0' long Culvert CPP, square edge headwall, Ke= 0.500
Outlet Invert= 2,076.60' S= 0.00577' Cc= 0.900
n= 0.012 Concrete pipe, finished
#2 Device 1 2,077.30' 2.0" Vert. Orifice/Grate C= 0.600
#3 Device 1 2,078.30' 2.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s)
#4 Device 1 2,080.00' 2.00' x 2.00' Horiz. Orifice/Grate Limited to weir flow C=0.600
#5 Secondary 2,081.00' 10.0' long x 2.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
2.50 3.00 3.50
Coef. (English) 2.54 2.61 2.61 2.60 2.66 2.70 2.77 2.89 2.88
2.85 3.07 3.20 3.32
Primary OutFlow Max=6.97 cfs @ 12.37 hrs HW=2,081.72' (Free Discharge)
L =Culvert (Barrel Controls 6.97 cfs @ 8.87 fps)
2=Orifice/Grate (Passes < 0.22 cfs potential flow)
3=Sharp-Crested Rectangular Weir (Passes < 27.22 cfs potential flow)
=Orifice/Grate (Passes < 25.27 cfs potential flow)
econdary OutFlow Max=15.94 cfs @ 12.37 hrs HW=2,081.72' (Free Discharge)
=Broad-Crested Rectangular Weir (Weir Controls 15.94 cfs @ 2.21 fps)
4 [-, N9'4-'
?a?
nprap outlet protection
Designed By: AB Date: 5/4/2011
Checked By: Date:
Company: CONFLUENCE ENG
Project Name: VW Wetland
Project No.:
Site Location (City/Town)
Culvert Id.
Outlet Data
Outlet pipe diameter, Do (in.)
Tailwater depth (in.)
Minimum/Maximum tailwater?
Discharge (cfs)
Pipe n
Velocity (fps)
Riprap d50, (ft.)
Minimum apron length, La (ft.)
Apron width at pipe outlet (ft.) 12
Apron shape
Apron width at outlet end (ft.) 36
Step 4. Detenn.ime the n2axunun stone diameter:
dux 1.5 x d50
Minimum TW
Max Stone Diameter, dmax (ft.) 1.5
Stop -5. Detemune the apron thickness:
Apron thickness = 1.5 x d
Minimum TW
Apron Thickness(ft.) 2.2
Mills River
FROM 48" RCP
48
20
Min TW (Fig. 8.06a)
136 from HydroCAD
0.015 RCP
10.8 APRON
Minimum TW Maximum TW
Figure 8.06a Figure 8.06b
1
32
12
4
Maximum TW
0
Maximum TW
0
10 year
OVERRIDES
CLASS 1
26
rprao outlet protection
Designed By: AB Date: 5/4/2011
Checked By: Date:
Company: CONFLUENCE ENG
Project Name: VW Wetland
Project No.:
Site Location (City/Town)
Culvert Id.
Outlet Data
Outlet pipe diameter, Do (in.)
Tailwater depth (in.)
Minimum/Maximum tailwater?
Discharge (cfs)
Pipe n
Velocity (fps)
Mills River
from 18" RCP
18
8
Min TW (Fig. 8.06a)
35 from HydroCAD
0.015 RCP
19.8 PLUNGE POOL
Minimum TW Maximum TW
Figure 8.06a Figure 8.06b
Riprap d50, (ft.) 1
Minimum apron length L. (ft.) 22
10 year
OVERRIDES
CLASS 1
Apron width at pipe outlet (ft.) 4.5 4.5
Apron shape
Apron width at outlet end (ft.) 23.5 1.5
Step 4. Determine the maximum stone diameter:
d? '1.5 x d50
Minimum TW Maximum TW
Max Stone Diameter, dmax (ft.) 1.5 0
Stop 5. Determine the apron thickne s:
Apron thickness = 1.5 x d
Minimum TW Maximum TW
Apron Thickness(ft.) 2.2 0 26
. Jab.
Rprap outiet protection
Designed By: AB Date: 5/4/2011
Checked By: Date:
Company: CONFLUENCE ENG
Project Name: VW Wetland
Project No.:
Site Location (City/Town) Mills River
Culvert Id. from wetland outlet
Outlet Data
Outlet pipe diameter, Do (in.) 12
Tailwater depth (in.) 5
Minimum/Maximum tailwater? Min TW (Fig. 8.06a)
Discharge (cfs) 7 from HydroCAD 10 year
Pipe n 0.013 hdpe
Velocity (fps) 8.9 APRON
Minimum TW Maximum TW OVERRIDES
Figure 8.06a Figure 8.06b
Riprap d50, (ft.) 0.4 CLASS B
Minimum apron length, La (ft.) 12 12
Apron width at pipe outlet (ft.) 3 3 3
Apron shape
Apron width at outlet end (ft.) 13 1 13
Step 4. Determine the mwanztun stone diameter:
d = '1.5 x d50
Minimum TW Maximum TW
Max Stone Diameter, dmax (ft.) 0.6 0
Step Z. Determine the apron thickness:
Apron thickness = 1.5 x d,
Minimum TW Maximum TW
Apron Thickness(ft.) 0.9 0 18
I^ • .
rlprap outlet proteutlon
Designed By: AB Date: 6/20/2011
Checked By: Date:
Company: CONFLUENCE ENG
Project Name: VW Wetland
Project No.:
Site Location (City/Town)
Culvert Id.
Outlet Data
Outlet pipe diameter, Do (in.)
Tailwater depth (in.)
Minimum/Maximum tailwater?
Discharge (cfs)
Pipe n
Velocity (fps)
Mills River
from flow splitter
12
5
Min TW (Fig. 8.06a)
0.3 from HydroCAD
0.013 hdpe
0.4 APRON
Minimum TW Maximum TW
Figure 8.06a Figure 8.06b
Riprap d50, (ft.) 0.3
Minimum apron length, L. (ft.) 8
Apron width at pipe outlet (ft.) 3
Apron shape
Apron width at outlet end (ft.) 9
Step 4. Determine the maximum stone charneter=
dmax = 1.5 x d50
Minimum TW
Max Stone Diameter, dmax (ft.) 0.45
Step 5. Determine the apron thickness:
Apron thickness = 1.5 x d,.,,.
Minimum TW
Apron Thickness(ft.) 0.675
3
1
Maximum TW
0
Maximum TW
0
10 year
OVERRIDES
CLASS B
12
3
13
18
+•
41 K
Existing Pond
Northern End of Facility
Drainage within Interior of Greenhouse Facility

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