19980382 Ver 1_More Info Received_20160607 (2)

Permit No.
(to be provided by DEMLR)
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral and Land Resources
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
LOW DENSITY SUPPLEMENT
This form may be photocopied for use as an original
A low density project is one that meets the appropriate criteria for built upon area and transports stormwater
runoff primarily through vegetated conveyances. Low density projects should not have a discrete stormwater
collection system as defined by 15A NCAC 2H .1002(18). Low density requirements and density factors can be
found in Session Law 2008-211, 15A NCAC 2H .1000, Session Law 2006-246 and the State of North Carolina
Stormwater Best Management Practice Manual. Curb and gutter systems are allowed provided they meet the
requirements in 15A NCAC 2H .1008(g).
I. PROJECT INFORMATION
Project Name : Poplar Ridge Lot 126
Contact Person: John Vilas Phone Number: ( 828 )386-1920
Number of Lots:1 Allowable Built Upon Area(BUA) Per Lot*:0.24
Number of Dwelling Units Per Acre**:N/A
Low Density Development (check one): ® without curb & gutter ❑ with curb & gutter, outlets to (check one):
❑ Swales ❑ Vegetated Area
*If lot sizes are not uniform,attach a table indicating the number of lots,lot sizes and allowable built upon area for each lot.
The attachment must include the project name,phase,page numbers and provide area subtotals and totals. BUA shall be
shown in units of square feet.
**(Phase II Post-Construction [non-SA] only)
II. BUILT UPON AREA
Refer to DEMLR's forms and applications website for specific language that must be recorded in the deed
restrictions for all subdivided projects. (http://portal.ncdenr.org/web/lr/state-stormwater-forms docs)
Complete the following calculation in the space provided below where:
• SA Site Area- the total project area above Mean High Water.
• DF Density Factor- the appropriate percent built upon area divided by 100.
• RA Road Area - the total impervious surface occupied by roadways.
• OA Other Area- the total area of impervious surfaces such as clubhouses, tennis courts, sidewalks, etc.
• No. of Lots - the total number of lots in the subdivision.
• BUA per Lot - the computed allowable built upon area for each lot including driveways and impervious
surfaces located between the front lot line and the edge of pavement.
• Total allowable lot BUA -the computed allowable built upon area for all lots combined.
• Total BUA from lot listing - the sum of built upon area allocated for each lot on the list of non-uniform lots.
Form SW401-Low Density-Rev.3-2/10/09 Page 1 of 4

Calculation:
For uniform lot sizes:
(SA: 43647 ft2 x DF: 0.182)—(RA: 3405 ft2)—(OA: 373 ft2) = BUA per Lot=4166 ft2
(No of Lots: 1)
For non-uniform lot sizes:
a. (SA: ft2 x DF: )—(RA: ft2)—(OA: ft2) =Total allowable lot BUA= ft2
b. Total BUA from lot listing: sf b must be< a
III. DESIGN INFORMATION
Complete the following table. If additional space is needed the information should be provided in the same
format as Table 1 and attached to this form. Rainfall intensity data can be found in Appendix 8.03 of the State
of North Carolina Erosion and Sediment Control Planning and Design Manual or at
http://hdsc.nws.noaa.gov/hdsc/pfds/
Table 1. Swale design information based on the 10-year storm.
Swale No. Drainage Impervious Grassed C Q Slope Vapow Vactual Flow
Area(ac) Area(ac) Area(ac) (cfs) (%) (fps) (fps) Depth(ft)
1 0.17 0.041 0.129 0.49 0.7 10 2.0 1.8 0.04
2 0.29 0.116 0.174 0.59 1.3 10 2.0 1.8 0.04
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Form SW401-Low Density-Rev.3-2/10/09 Page 2 of 4

IV. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Administrative Code Section 15A
NCAC 2H .1000, NCDENR BMP Manual (2007), Session Law 2006-246, and Session Law 2008-211.
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 that the following requirements
have been met and supporting documentation is provided as necessary. If the applicant has designated an agent
on the Stormwater Management Permit Application Form, the agent may initial below. If any item is not met,
then justification must be attached. Only complete items n through p for projects with curb outlets.
Page/Plan
Initials Sheet No.
N/A a.tFor projects in the 20 coastal counties: Per NCAC 2H.1005, a 50 foot wide vegetative buffer is
provided adjacent to surface waters. For Redevelopment projects, a 30' wide vegetative
buffer adjacent surface waters is provided.
N/A b.tFor HQW or ORW projects outside the 20 coastal counties: A 30 foot wide vegetative buffer is
provided adjacent to surface waters.
N/A c.t For Phase II Post-Construction projects: All built upon area is located at least 30 feet landward of
all perennial and intermittent surface waters.
N/A d. Deed restriction language as required on form SWU-101 shall be recorded as a restrictive
covenant. A copy of the recorded document shall be provided to DWQ within 30 days of
platting and prior to the sale of any lots.
ii
U 4 e. Built upon area calculations are provided for the overall project and all lots. —L o+ i Z b oK l ,
4/V4 £ Project conforms to low density requirements within the ORW AEC. (if applicable per
15A NCAC 2H .1007)
/1./6/ 2,3,4,5 g. Side slopes of swales are no steeper than 3:1; or no steeper than 5:1 for curb outlet swales.
f/4 55 h. Longitudinal slope of swales is no greater than 5%;for non-curb outlet projects, calculations for
/t shear stress and velocity are provided if slope is greater than 5%.S'alit k. Sloft 7 C'
See Caks Ott' itcc
4/V-4 55 i. At a minimum, swales are designed to carry the 10 year storm velocity at a non-erosive rate.
N/A j. Swales discharging to wetlands are designed to flow into and through the wetlands at a non-
erosive velocity(for this flow requirement into wetlands, non-erosive is velocity<2 ft/s).
r2 3 k. Swale detail and permanent vegetation is specified on the plans.
1// 2,3 1. Swale detail provided on plans; includes grass type(s) for permanent vegetative cover.
/71 m. Swales are located in recorded drainage easements. -No -Sialc S "''" o'` flak tAi, 4/
wo ttcs,n,t.rcl ease0....&r.
N/A n.'' Length of swale or vegetated area is at least 100 feet forN
each curb outlet.
N/A o.tt The system takes into account the run-off at ultimate built-out potential from all surfaces
draining to the system (delineate drainage area for each swale).
N/A p." Curb outlets direct flow to a swale or vegetated area.
t Projects in the Neuse,Tar-Pamlico,Catawba River basins,and Randleman Lake may require additional buffers.
ft Only complete these items for projects with curb outlets.
Form SW401-Low Density-Rev.3-2/10/09 Page 3 of 4

V. SWALE SYSTEM MAINTENANCE REQUIREMENTS
1. Mowing will be accomplished as needed according to the season. Grass height will not exceed six inches at
any time; and grass will not be mowed too close to the ground or "scalped".
2. Swales will be inspected monthly or after every runoff producing rainfall event for sediment build-up,
erosion, and trash accumulation
3. Accumulated sediment and trash will be removed as necessary. Swales will be reseeded or sodded following
sediment removal.
4. Eroded areas of the swales will be repaired and reseeded. Swales will be revegetated as needed and in a
timely manner based on the monthly inspections. Side slopes must be maintained at the permitted slope.
5. Catch basins, curb cuts, velocity reduction devices, and piping will be inspected monthly or after every
significant runoff producing rainfall event. Trash and debris will be cleared away from grates, curb cuts,
velocity reduction devices and piping.
6. Swales will not be altered, piped, or filled in without approval from NCDENR Division of Energy, Mineral
and Land Resources.
I acknowledge and agree by my signature below that I am responsible for the performance of the six maintenance
procedures listed above. I agree to notify DEMLR of any problems with the system or prior to any changes to
the system or responsible party. elm? /20p44,? /f)/426-C G4 c
Print Name and Title:Poplar Ridge Lot 126 ' MAt?Jt 1/21-1.4.6",
Address: Moo ,9f4Gc+/ PC4CE, ,�(tc zest, ,teeI# 4
tev0, ✓ 3.4- 2 Zo
Phone: 4304 Z€S O8'o7 Date: 3� 0c-
Signature:
Note: The leg esponsible 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, Ch//J�,
M t M C. X30 // , a Notary Public for the State of V ! t/Q 1/>a �� ,County of
/lenI/I tO ,do hereby certify that hy1 44,e b h tl/L( �J personally appeared before me this
l.� 1
I/ day of , At/ 4. , and acknowledge the due execution of the forgoing swale maintenance
requirements. Witness my hand and official seal,
0/1/44/o
Notary signature
,,,,C .BROn,
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P.tiPPY Pu O . ''%
/ REG # 4n.na'
n i z 7521150 'A4 SO 026 kV
SEAL _3'; COMM _ISSION e My commission expires l(Vijfj'N'p', rXJ
t\ 1 E `�``
Y. c
ak7A LTM �F •
Form SW40 I-Low Density-Rev.3-2/10/09 Page 4 of 4

Stormwater Discharge from impervious
surfaces will sheet flow from surface
or as close to surface as possible so
as to maximize infiltration and filtration.
Grassed Swale will convey runoff to
property boundary.
PLAN VIEW
\ flow m slid..
Drainage Area 1 \ II II
Total Area:0.17 W �
Percent ImperMoua247L \ • \ ♦ \ �_ w oAx / /
© /
IjICABEE
/ n,SSOCL4TES,P_A
aow OuuN m La n MOOL ` ♦ e:'' ttTm✓emm rvnbau.mu a,u✓v u.:.v.wnrrm
+� t �\ at. a lr y i� WPB POPLAR RIDGE LLC
m,mmt an An and on \ I I (BEING LOT 126 OP POPLAR RIDGE)
a� y
1 g�j flMw TOTAL AREA
4"t Floo, bad. I\ ; OF5URVET
Drainage Area 2 .L W i �Y` \ 1.002 ACRE5
Total Area:0.29
Percent Impervloue:40% l/yfERFNcfs;.
♦ ((f I \ ` -oN 4675 PG 1320
9wt Fla to Snowt\ \ I \� ♦\ -PEJO%ft)90
e.wwat r� on and w
1n�
ow Col
�\
of\ \♦ swd. r \ s I ♦ ♦ I s\ v Drainage Area 3 \\ \ s Total Area: 0.086
\
a ♦ Percent Impervious: 19%
l m ��t ♦
Raewa ewer DAs wn stood Am
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♦ ♦ ♦ \ \ \ \♦ \ ` I ROP05WSTREAM RELOCA� N / m4 aCfvnt wood
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It
Scale 1:50

Conveyance Swale 1 (Typical)
1.
The
Swale will hovea
flaw depth of 0.04 Feet.
2.
The
Swale will have 0.5 feet of freeboard depth.
3.
The
top width of the
Swale will be 14 feet
4.
Side
slopes will be 3:1
or flatter.
5.
The
slope of the Swale will be 10%
6.
Swale Is designed to
accommodate 10 year storm.
Not To Scale
1. Swale will be mowed, grass will not exceed 5" in height
2. Swale will be inspected monthly for debris buildup.
3. Swale will be reseeded or sodded as needed.
4. Side slopes will be maintained.
5. Grass type will be Tall Fescue or similar.
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Conveyance Swale 2 (Typical)
1. The Swale will have a flow depth of 0.04 Feet.
2. The Swale will have 0.5 feet of freeboard depth.
3. The top width of the Swale will be 22 feet
4. Side slopes will be 3:1 or flatter.
5. The slope of the Swale will be 10%
6. Swale is designed to accommodate 10 year storm.
Not To Scale
1. Swale will be mowed. grass will not exceed 6' in height
2. Swale will be inspected monthly for debris buildup.
3. Swale will be reseeded or sodded as needed.
4. Side slopes will be maintained.
5. Grass type will be Tall Fescue or similar.
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Swale Design for Stormwater Management Plan
Poplar Ridge Lot 126
5/17/2016
Low Density Requirement Calculations
Built Upon Area 0.18 acres
Total Area 1.002 acres
Total Percentage of Built Upon Area 18
Runoff is Transported Primarily Through Vegetated Conveyances (As Shown In Plan
View)
Runoff Calculations Using Rational Method
Pre Development Runoff (Drainage Area 1)
Design
10yr-5min Storm Intensity (Buncombe County, NC)
7.06
in/hr
Impervious Area
0.041
acres
C (Impervious Areas)
0.95
ft
Pervious Area
0.129
acres
C (Pervious Areas)
0.35
ft
Weighted C
0.49
ft
Swale Drainage Area
0.17
acres
Peak Discharge
0.6
cfs
Drainage Area 1 Swale Design Calculations (Manning's)
Does Not Include Freeboard
Design
Bottom Width
10
ft
Side Slopes (x:1)
3
Max Flow Depth
0.040
ft
Area
0.40
ftA2
Wetted Perimeter
10.3
ft
Top Width
10.2
ft
Slope
0.1
Hydraulic Radius
0.04
ft
Manning's n coefficient
0.03
Flow Rate
0.7
cfs
Velocity of Flow
1.8
ft/s
Swale 1 Sizing (With Freeboard)
Swale Bottom Width 10 ft
Swale Design Depth (With 0.5 Feet of Freeboard) 0.54 ft
Side Slope Min 3:1
Top Width 14 ft

Tractive Force Calculation (Drainage Area 1)
Specific Weight of Water 62.4 lb/ft-3
Depth 0.040 ft
Slope 0.1
Tractive Force 0.25 lb/ft-2
Maximum Allowable Tractive Force for Tall Fescue is 0.60
Runoff Calculations Using Rational Method
Pre Development Runoff (Drainage Area 2)
Design
10yr-5min Storm Intensity (Buncombe County, NC)
7.06
in/hr
Impervious Area
0.116
acres
C (Impervious Areas)
0.95
ft
Pervious Area
0.174
acres
C (Pervious Areas)
0.35
ft
Weighted C
0.59
ft
Swale Drainage Area
0.29
acres
Peak Discharge
1.2
cfs
Drainage Area 2 Swale Design Calculations (Manning's)
Does Not Include Freeboard
Design
Bottom Width
18
ft
Side Slopes (x:1)
3
Max Flow Depth
0.040
ft
Area
0.72
ftA2
Wetted Perimeter
18.3
ft
Top Width
18
ft
Slope
0.1
Hydraulic Radius
0.04
ft
Manning's n coefficient
0.03
Flow Rate
1.3
cfs
Velocity of Flow
1.8
ft/s
Swale 2 Sizing (With Freeboard)
Swale Bottom Width 18 ft
Swale Design Depth (With 0.5 Feet of Freeboard) 0.540 ft
Side Slope Min. 3:1
Top Width 22 ft
Tractive Force Calculation (Drainage Area 2)
Specific Weight of Water 62.4 lb/ft-3
Depth 0.040 ft
Slope 0.1
Tractive Force 0.25 lb/ft-2
Maximum Allowable Tractive Force for Tall Fescue is 0.60

Rational Method Equation
Q = ciA
Manning's Equation
1.49 z
Q = VA = n AR3f