20061666 Ver 2_Stormwater Info_20070720

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STORM DRAINAGE SYSTEM
CALCULATIONS AND DESIGN
FOR
ROSEMOOR SUBDIVISION
MIDDLE CREEK TOWNSHIP, WAKE COUNTY, NORTH CAROLINA
July 19, 2007
Blackburn Consulting Engineering
234 E. Main Street
Clayton, NC 27520
Ph. [phone] Fax [phone]
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1' WAKE COUNTY, NORTH CAROLINA -
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DWQ Project No. ~ ~D ~ ~, ~fJ ~D
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please com~p.lete the following information):
Project Name : _~3S2Y'Y1l~CSr- Ji,~~~'1~(I~SIGr1
Contact Person: ~GLh~ (.~i `mil CCLC~I{ ~~?rr~ Phone Nu ber: l~ ~ 5~ --2-~ -~l~
For projects with multiple basins, specify which basin this worksheet applies to: ~3 L.D S a~l - ~
Permanent Pool Elevation .~ ~ 2. ft. (elevation of the orifice invert out)
Temporary Pool Elevation ~ i ~l ft. (elevation of the outlet structure invert in)
Bioretention Surface Area t ~ sq. ft.
Drainage Area ~ • l:>;~, ac.
Impervious Area j S`~ ac.
Rational C Coefficient (~.S
Size
Inlet Velocity ~ ~~ fps
Inlet flow depth 1 C~ , I in
Depth to Ground Water gyp' ~+- ft.
Planting Soil Infiltration Rate C7,S2 in./hr.
In-Situ Soil Infiltration Rate ~rEun pt ~~. in./hr
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(either 5% in w/sand under drain or 7% in w/o)
(the soil layer down to 4 feet)
(the soil layer below 4 feet or below the sand bed)
REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
W'W'~ No vertical sand bed is proposed
. _ The bioretention area is at least 40 feet by 15 feet.
~;•~ ~~rt -{'1 ova 'Sheet flow is provided at inlet.
Water table depth is greater than 6 feet.
Minimum of 6" ponding is provided.
The ponded area will draw down in less than 4 days.
Planting soil infiltration rate is greater than 0.52 in/hr.
_ The in-situ soil infiltration rate is greater than 0.2 in/hr.
A planting plan with species and densities is provided.
Mulch layer is specified in plans.
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
Plan details for the bioretention area provided.
Plan details for the inlet and outlet are provided.
An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

Permit No.
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied for use as an original.
(to be provided by DWQ)
DWQ stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name
Contact Person:
Phone Number: (~~1~1) S,S~ - 2~1C~
For projects with multiple basins, specify which basic this worksheet applies to: ~~ ~~~~1 ~`~
(must match die DA # ora the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type ~~~`~'" J ~'-~
In-Situ Soil Infiltration Rate ~2 in./hr. (the most restrictive soil layer)
SHWT Elevation ~0+ ft. (Seasonal High Water Table elevation)
Planting Soil Texture ~stu ~G~Cx-rm (must be a sandy loam, loamy sand, or loam texture)
Planting Soil Infiltration Rate ~ in./hr.
Basin Design Parameters
Drainage Area ~~~~ sq.ft. (on-site and off-site drainage to the basin)
Impervious Area 1.3 3 ~21u~-R sq.ft. (on-site m2d off=site drainage to the basin)
Design Storm ~ inch (1.5 inch event, for SA traterr, 1 inch event for others)
Design Volume 1 c~ ~ ~ c.f. (storage volume re~ttired)
Inlet Velocity l .~ ~ fps
Drawdown Time 2 hours
Basin Elevations
Temporary Pool Elevation ~~17 fmsl (elevation of the bypass/uudet sn-ucture)
Planting Elevation ~ ~ fmsl (elevation of the ground surface bottom)
Bottom Elevation ~1 fmsl (elevation of the bottom of the planting media)
Basin Dimensions
Basin Size 7~ ft. x _ ~ ft. _ ~~..4~sq. fl. (surface area ar basin bottom)
Basin Volume Provided ~~- ~ c.f.
SWU-l08 4.07
Page 1 of 4

Basin Plantings
Number of plantings required ~ ~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided ~- -Trees 3 + Shrubs ~ ~ (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
5p/y` a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
b. No vertical sand bed is proposed.
~~ ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
Q/LA/N.46,~ SN,{~d. A grass buffer strip and sheet flow conditions are provided at the inlet.
5~~ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~Prf f. Ponding depth of 6-12" is provided.
S~f~ g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
r~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
.S/~~ i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
~OH j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~~ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~P~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

spy m. Type of mulch layer and depth is specified on the plans.
~~°~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
Sly o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
S ~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
-S~~ q. A benchmark is provided to determine the sediment accumulation in the basin area.
SP~ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
s~~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
„S ~~ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
Z. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75%o of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed.
SWU-108 4.07
Pagc 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~~^'~ ~~Nk1-~S
Title: Yt/1 /'~-~ p~6 1-~ ~
Address: r/ ~3~~ ~ IX ~DIL.KS ~ ~~ L K /AL'~e6f-~' d~4 ~- 2-? ~' I `j
Phone: ---i~`~ ~~~ ~~y A ~ ~ 3
Signature: ~o
Date: ~. ~`~"~ b
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. II''
I, ~0~0.,nno~._ ~- ~ 4-V IDS , a Notary Public for the State of Nti r"~ CC~.ro j i /l.(~,
County of h.kc~ce- , do hereby certify that _ ~Or+-~ G~./~. k.i rLS
personally appeared before me this ~ ~} ~ day of ~~I db~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
~ ~~~~~~
Qa~ ~ ~
~~~ ~
d ~` L. j~ bY:,,S s
~p/
~,:~~
'~~~
a 1~~
SEAL ~~ ' /
My commission expires ~ t ~ OS ~ 201 D
SWU-108 4.07
Page 4 of 4

W4
Mt
07/05/2007
Vi-
Ak
-4

~3
Bioretention Sizing
Watershed Size
2:03' acres
Connected Impervious of Watershed
15%
Water Quality Storm
12 in
For Disconnected/Composite Area
Soil Type CN
0 A 49
0 B 69
1 C 79
0 D 84
79 Selected Curve Number
note: Select Soil Group with "1"
First Flush Runoff
`' _ 0' S3 ac-in equation: based off SCS CN Method. No Composite CN
Average Ponding Depth
12 in
Surface Area
'0:04 ac equation: Volume /Depth
.1931 sf
Fill Soil Choice
Nitrogen Removal -Sandy Loam
K= 1 in/hr Soil Type: 12% Fines (Silt+Clay), 82-85% Sand, 3-6% Organic
Other Pollutant Removal -Loamy Sand
K= 2 in/hr Soil Type: 8% Fines (Silt+Clay), 86-90% Sand, 2-4% Organic
K= 2 in/hr
Underdrains
Minimum Flow
equation: Q = 2.3E-5 * K * A
_y.,;;;; , 0:09 cfs
Factor of Safety (range between 2 and 10)
4
Design Flow

Note to User:
Yellow Cells Require User Input
Blue .Cells Have Been Previously Determined
Pink Cells are Calculations within this Spreadsheet
Breakdown of Runoff
Connected Imperv RO 0.99 in 0.30 ac-in
Composite RO (the rest) 0.13 in 0.23 ac-in

al3
cfs
Manning's Roughness Coefficient
0.011 smooth wall
0.015 corrugated wall
0.011 n
Internal Slope (recommended minimum 0.5%)
0.5
Pipe(s) Diameter(s)
~~
~~ 5 40 inches
~,~: t.
equation: D = 16 * (Q * n * s^0.5)^(3/8)
# of 4" diam. # of 6" diam. calculations assume n=0.011
Underdrains Underdrains
,3 2.;
Note: A minimum of 2 underdrains recommended
Equivalent Pipe Diameters
D= (in) No. of 4" diam D= (in) No of 6" diam
5.13 2 7.84 2
5.95 3 9.11 3
6.66 4 10.13 4
7.22 5

~3
Formulating Pre- & Post- Development Hydrographs
utilize small watershed method &center-weighted storm (Malcom)
Location Raleigh/Durham
Return Period 10 year
1= 7.22 in/hr (assumes Tc <= 5 min, check below)
Cpre 0.4 (Rational C, see adjoining table)
Cpost 0.5
A= 2;03 acre
A= 88426.8 sf Rainfall 3.90 in (6 hr Depth)
Qpre= 5.9 cfs
Qpost= 7.3 cfs
Vol -Pre 9291 cf
Vol -Post 15492 cf
Tpre 19 min
Tpost 25 min
T ime
min. Q- pre Q-past
cfs cfs
0 0.00 0.00
1 0.04 0.03
2 0.16 0.11
3 0.35 0.25
4 0.62 0.44
5 0.95 0.68
6 1.33 0.97
7 1.75 1.30
8 2.21 1.66
9 2.69 2.05
10 3.17 2.47
11 3.65 2.91
PRE C N 70 S= 4.29 Q*= 1.26 in
POST CN 82 S= 2.221 Q*= 2.10 in
(total pre-development runoff volume)
(total post-development runoff volume)
Time of Concentration (Kirpich Tc Equation)
Predevelopment
L 750 ft (Length of Overland Flow)
S 0.105 ft/ft (average overland slope)
tc 3.04 min bare soil
tc 6.08 min grassed
Post Development
L 750 ft (Length of Overland Flow)
S 0.105 ft/ft (average overland slope)
tc 3.04 min bare soil
tc 1.22 min asphalt concrete
Note: Compare this to a 5 minute minimum.

~3
Hydrograph Routing through Bioretention
Watershed Area
Surface Area
Surface Area
Average Depth
Average Depth
Storage Volume
'°'~. 2,03 ac
~' 0.04 ac
1931 sf
12 in
1 ft
1931 cf
Bioretention Outlet Control
Surf. Infiltration Rate 2 in/hr
If Sandy Loam, 1 in/hr, Loamy Sand, 2 in/hr
Volume lost to Exfl 322 cf/hr
Type Structure: Weir
Dimensions
length 3 ft
width 3 ft
Total Length 12 ft
occupied by grate 0
Effective length 12 ft
Height above soil 12 in
Height 1.00 ft
Number of Outlets 1 outlets
Max Depth Over Grate 0.34 ft
Time Inflow. Volume in Cum Vol in Depth, O verflow E xfilt Vol Out
min cfs cf cf ft cfs cf cf
0 0.00 0 0 0.00 0.00 0.00 0
00
1 0.03 2 2 0.00 0.00 1.69 .
1.69
2 0.11 7 7 0.00 0.00 5.36 5.36
3 0.25 15 16 0.01 0.00 5.36 5.36
4 0.44 26 38 0.02 0.00 5.36 5
36
5 0.68 41 73 0.04 0.00 5.36 .
5.36
6 0.97 58 126 0.07 0.00 5.36 5.36
7 1.30 78 198 0.10 0.00 5.36 5.36
8 1.66 100 292 0.15 0.00 5.36 5
36
9 2.05 123 410 0.21 0.00 5.36 .
5
36
10 2.47 148 553 0.29 0.00 5.36 .
5
36
11 2.91 175 722 0.37 0.00 5.36 .
5
36
12 3.36 202 919 0.48 0.00 5.36 .
5
36
13 3.81 229 1142 0.59 0.00 5.36 .
5
36
14 4.27 256 1393 0.72 0.00 5.36 .
5
36
15 4.71 282 1670 0.86 0.00 5.36 .
5
36
16 5.13 308 1972 1.02 0.12 5.36 .
12
27
17 5.54 332 2292 1.19 2.92 5.36 .
180
69
18 5.91 355 2467 1.28 5.27 5.36 .
321
37
19 6.25 375 2520 1.31 6.08 5.36 .
370
17
20 6.55 393 2544 1.32 6.44 5.36 .
391
81
21 6.81 409 2560 1.33 6.71 5.36 .
407
85
22 7.02 421 2574 1.33 6.92 5.36 .
420
67
23 7.18 431 2584 1.34 7.08 5.36 .
430
28
24 7.28 437 2590 1.34 7.19 5.36 .
436
59
25 7.33 440 2593 1.34 7.24 5.36 .
439
52
26 7.32 439 2593 1.34 7.23 5.36 .
439
05
27 7.25 435 2589 1.34 7.16 5.36 .
435
23
28 7.13 428 2581 1.34 7.05 5.36 .
428
13
29 6.96 418 2571 1.33 6.88 5.36 .
417
89
30 6.74 404 2557 1.32 6.66 5.36 .
404
69
31 6.47 388 2540 1.32 6.39 5.36 .
388
75
32 6.16 370 2521 1.31 6.09 5.36 .
370.93

~3
Bioretention Flow Mitigation
$.oo ~-~..~...~..~......
~_ ~ ~ ~ ~ i
~
oo --
. -
6.00 - -- --.-
----------

5.00 - ------
'
~ - -----

4.00 ~t
.;
-- --- ~.

o
_
~ 3.00
-
fi
-- -- -
-
I -
--
2.00 -- -- - -
------- - ----------

1.00 - -- . -

0.00 _ ~ ~.. " .
w _ _ _ ~ . ~ ~. ,
~

50 100 150 200
. _.., ,
250

-1.00 _,
r
Time (minutes)
~~~Inflow (Post Dev O) .~~..~..BR Outflow ~-pre-dev ~

DWQ Project No. ~~-1 ~~
DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : D, O~~ ~~ tStov-~
Contact Person: ~'.~-t'11'~ ~~ C~Uc_.t-jL,r ,.~ Phone Number. l
For projects with multiple basins, specify which basin this worksheet applies to: _~ ~~~ ~t3 ~
`-7 ~-
Permanent Pool Elevation ~_ ft. (elevation of the orifice invert out)
Temporary Pool Elevation
`~_ ft. (elevation of the outlet structure invert in)
Bioretention Surface Area
Drainage Area
Impervious Area
Rational C Coefficient
Size
Inlet Velocity
Inlet flow depth
Depth to Ground Water
Planting Soil Infiltration Rate
In-Situ Soil Infiltration Rate
II. REQUIRED ITEMS CHECKLIST
`'2..Z'7 sq. ft.
_ 1 < 2~1 ac.
I S`~~ ac.
r„
- `-
2:0 fps
l0. 2 in
+- n.
h.:~2 in./hr
l~r~ -> PIP = in./hr
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(either 5% in w/sand under drain or 7% in w/o)
(the soil layer down to 4 feet)
(the soil layer below 4 feet or below the sand bed)
~` \~7
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
a~ No vertical sand bed is proposed
~ The bioretention area is at least 40 feet by 15 feet.
~ 'L~7~'~ Sheet flow is provided at inlet.
Water table depth is greater than 6 feet.
Minimum of 6" ponding is provided.
The ponded area will draw down in less than 4 days.
Planting soil infiltration rate is greater than 0.52 in/hr.
The in-situ soil infiltration rate is greater than 0.2 inlhr.
A planting plan with species and densities is provided.
Mulch layer is specified in plans.
______I Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
Plan details for the bioretention area provided.
Plan details for the inlet and outlet are provided.
An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form Wray be photocopied for use as an original.
DWO Stormwater Management Plan Review
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
L PROJECT INFORMATION
Project Name : ~~-~'1C~G ,~ ~ C~t~l\S\~~l
Contact Person:~YlyQ~ ~~ -c c 1,r h,~,•~
Phone Number: (q lei) ~5 .3-29e~
For projects with multiple basins, specify which basin this worksheet applies to: _LO~S 73-~]~
(Hurst match the DA # on the applicatio~z & pions)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type
In-Situ Soil Infiltration Rate
SHWT Elevation
Planting Soil Texture
Planting Soil Infiltration Rate
Basin Design Parameters
Lc,cw,~~`,~,
~ in./hr. (the most restrictive sorl love,-)
lOt ft. (Seasonal Nigh Water Table elevation)
S~~Ln ~ cciY-'r (muse be u sandy loam, loamy sand, or loana~ texture)
in./hr.
Drainage Area 5 C ~
4~ r.,l. ~__ sq.fL (oi~-sire aid off=site draina,Ke ro ~hc basin)
Impervious Area _--U~-L`--r-_ sq.ft. (on-sire and v -site drnirrage ro the basin)
Design Storm ~~
inch (1._5 inch evevu for SA rvaler.r, I inch event for ushers)
Design Volume I LZ7 c.f. (storage volume required)
Inlet Velocity ? . U fps
Drawdown Time I ~ S hours
Basin Elevations
Temporary Pool F,levation ~~=(u fmsl (efc ~,airon of rhe h~~pass/ourler .rrruc~nrre>
Planting Elevation ~ fmsl
(elevati~,n ojrhr ground surface bottom)
Bottom Elevation _ ~; .~ fmsl
~'~--.__ (elc raliori of the bottom of the planting media)
Basin Dimensions
Basin Sire CCJ~ _ ft. x ._~-~
Basin Volume Provided ~ - tt. - --~-~~~---Sq~ It~ i~~~lrCface area at basin hottom)
C~C% c.f.
-- ~ ~-- --
SWU-108 4.07
Page I of ~!

Basin Plantings
Number of plantings required ~~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided ~_ =Trees Z + Shrubs_~ (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
~~~ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
Sp N b. No vertical sand bed is proposed.
S'~ H c. The bioretention area is at least 15 feet wide by 40 feet long.
D~~c~ d. A grass buffer strip and sheet flow conditions are provided at the inlet.
SPH e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
.Sibly/y f. Ponding depth of 6-12" is provided.
s~ll g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
s~'~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
So'y i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
S~y j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
s~'~ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
`~~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

~/~// m. Type of mulch layer and depth is specified on the plans.
`5~~~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
s®lf o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
's~~f p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
s0~1' q. A benchmark is provided to determine the sediment accumulation in the basin area.
~~~ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~~'~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~~i7 t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed.
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
~-
Print name: ~ ~ lnn ~~~dJS
Title: {MA--~~1~1G ~ ~f~'~'R~~__
Address: g~ t'o~ S tk ~/LKS ~-0 ~'Z'i2 ~ ~(r~6-~ tit L rC,?~! S
Phone: Cc( 14 ~ I ~' ~ - ~ 3 3 9
Signature: ~- ' ~~'~
Date: 5 't `~' ~~"
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, `) 0~~, ~ +~ ru=g- 4~-. ~ ~-~ (y ~ , a Notary Public for the State of 11~D r ~ ~rt~ ~ ~ n ~ ,
County of l~G.~c:~ , do hereby certify that 1 rr~ ~`t~ IG- t +/~ S
personally appeared before me this ~_day of +"~~ , ~, and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
~- .,
~~ ~_.<
~ P ~~~ ~ ~
`~, ~yrp
p 7~4 N
F
SEAL
My commission expires ~t `p5~2o~ U
~.~_ T~
SWU-108 4.07
Page 4 of 4

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Sr awl f �l+�r .Y.�4.
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r � 'Ay�'ai y p ,-�',�atA 'K; ,'�' g x ° y.,, ^.t s�*, t - � � *$&3's .� n' •c�,,&„'�
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w
�Yy �. *^'�`.x � l "-x3. ti^'Y ♦ t •d' _ �s6 1. �' .�*�Ta+ ,..
x�`;,*„ y{R.aw���,,a,.�g�iJ�� � � 'b; )C��'^''. y,t �ai� t' y� ++ �e t'y�,�/ ��,ri2 r a.., `''�`•k �. ,�, ���.�+r�`�yf �� a ���::
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-~ ~ ~3
Bioretention Sizing
Watershed Size
1.29. acres
Connected Impervious of Watershed
1'S
Water Quality Storm
12 in
For Disconnected/Composite Area
Soil Type CN
0 A 49
0 B 69
1 C 79
0 D 84
79 Selected Curve Number
note: Select Soil Group with "1"
First Flush Runoff
0.34 ac-in equation: based off SCS CN Method. No Composite CN
Average Ponding Depth
12 in
Surface Area
0.03 ac equation: Volume /Depth
1227 sf
Fill Soil Choice
Nitrogen Removal -Sandy Loam
K= 1 in/hr Soil Type: 12% Fines (Silt+Clay), 82-85% Sand, 3-6% Organic
Other Pollutant Removal -Loamy Sand
K= 2 in/hr Soil Type: 8% Fines (Silt+Clay), 86-90% Sand, 2-4% Organic
K= 2 in/hr
Underdrains
Minimum Flow
equation: Q = 2.3E-5 * K * A
0:06 cfs
Factor of Safety (range between 2 and 10)
4:
Design Flow
Note to User:
Yellow Cells Require User Input
Blue Cells Have Been Previously Determined
Pink Cells are Calculations within this Spreadsheet
Breakdown of Runoff
Connected Imperv RO 0.99 in
Composite RO (the rest) 0.13 in
0.19 ac-in
0.15` ac-in

Vii?' l ~
0.23 cfs
Manning's Roughness Coefficient
0.011 smooth wall
0.015 corrugated wall
0.011 n
Internal Slope (recommended minimum 0.5%)
0.5
Pipe(s) Diameter(s)
X4:56'. inches
equation: D = 16 * (Q * n * s^0.5)^(3/8)
# of 4" diam. # of 6" diam. calculations assume n=0.011
Underdrains Underdrains
. 2 2
e_~
Note:A~minimum of 2 underdrains recommended
Equivalent Pipe Diameters
D= (in) No. of 4" diam D= (in) No of 6" diam
5.13 2 7.84 2
5.95 3 9.11 3
6.66 4 10.13 4
7.22 5

-~~' I~~
Formulating Pre- & Post- Development Hydrographs
utilize small watershed method &center-weighted sform (Malcom)
Location Raleigh/Durham
Return Peri od 10 year
1= .:. 7.22 in/hr
~ (assumes Tc <= 5 min, check below)
Cpre 0.4 (Rational C, see adjoining table)
Cpost 0.8
A= 1.29 acre
A= 56192.4 sf Rainfall 3.90 in (6 hr Depth)

Qpre=
Q
ost= 3.7 cfs
7:5
f PRE CN 70 S= 4.29 Q'`= 1.26 in
II
II
p c
s POST CN 82 S= 222 Q'= 2
10 in
.
Vol -Pre 5904 cf (total pre-development runoff volume)
Vol -Post 9845 cf (total post-development runoff volume)
Tpre 19 min Time of Concentration (Kirpich Tc Equation)
Tpost 16 min Predevelopment
L 190 ft (Length of Overland Flow)
S 0.125 fbft (average overland slope)
tc Q.99 min bare soil
T ime Q- pre Q- post tc 1.97 min grassed
min cfs cfs
0 0.00 0.00 Post Development
1 0.03 0.07 L 190 ft (Length of Overland Flow)
2 0.10 0.29 S 0.125 ft/ft (average overland slope)
3 0.22 0.64 tc 0.99 min bare soil
4 0.39 1.11 tc 0.39 min asphalt/concrete
5 0.60 1.69
6 0.84 2.34 Note: Compare this to a 5 minute minimum.
7 1.11 3.05
8 1.41 3.79
9 1.71 4.52
10 2.02 5.22
11 2.32 5.86

~"/3
Hydrograph Routing through Bioretention
Watershed Area
Surface Area
Surface Area
Average Depth
Average Depth
Storage Volume
Surf. Infiltration Rate 2 in/hr
If Sandy Loam, 1 in/hr, Loamy Sand, 2 in/hr
Volume lost to Exfl 204 cf/hr
Bioretention Outlet Control
Type Structure: Weir
Dimensions
length 3 ft
width 3 ft
Total Length 1 2 ft
occupied by grate 0
Effective length 1 2 ft
Height above soil 1 2 in
Height 1.0 0 ft
Number of Outlets 1 outlets
Max Depth Over Grate 0.35 ft
Time Inflow . Volume in Cum Vol in , Depth Overflow Exfilt Vol Out
min cfs cf cf ft cfs cf cf
0 0.00 0 0 0.00 0.00 0.00 0.00
1 0.07 4 4 0.00 0.00 3.41 3.41
2 0.29 17 18 0.01 0.00 3.41 3.41
3 0.64 38 53 0.04 0.00 3.41 3.41
4 1.11 67 117 0.10 0.00 3.41 3.41
5 1.69 101 214 0.17 0.00 3.41 3.41
6 2.34 140 352 0.29 0.00 3.41 3.41
7 3.05 183 531 0.43 0.00 3.41 3.41
8 3.79 227 755 0.62 0.00 3.41 3.41
9 4.52 271 1023 0.83 0.00 3.41 3.41
10 5.22 313 1332 1.09 0.91 3.41 57.91
11 5.86 352 1626 1.33 6.69 3.41 404.70
12 6.42 385 1607 1.31 6.21 3.41 375.94
13 6.88 413 1644 1.34 7.13 3.41 431.12
14 7.21 432 1645 1.34 7.16 3.41 433.12
15 7.40 444 1656 1.35 7.44 3.41 450.07
16 7.45 447 1653 1.35 7.37 3.41 445.32
17 7.35 441 1649 1.34 7.26 3.41 439.00
18 7.12 427 1637 1.33 6.95 3.41 420.45
19 6.74 405 1621 1.32 6.55 3.41 396.56
20 6.26 376 1600 1.30 6.04 3.41 366.04
21 5.77 346 1580 1.29 5.57 3.41 337.63
22 5.32 319 1562 1.27 5.14 3.41 311.56
23 4.90 294 1544 1.26 4.73 3.41 287.46
24 4.51 271 1527 1.24 4.36 3.41 265.26
25 4.16 249 1511 1.23 4.02 3.41 244.78
26 3.83 230 1496 1.22 3.71 3.41 225.89
27 3.53 212 1482 1.21 3.42 3.41 208.47
28 3.25 195 1469 1.20 3.15 3.41 192.40
29 2.99 180 1456 1.19 2.90 3.41 177.58
30 2.76 165 1444 1.18 2.68 3.41 163.91
31 2.54 152 1432 1.17 2.46 3.41 151.31
32 2.34 140 1421 1.16 2.27 3.41 139.68

~~ ~~
Bioretention Flow Mitigation
s.oo
7.00 --
6.00
5.00 - - -
~ 4.00
U
3
0
~ 3.00 -- - -

~k14
DWQ Project No. ('~'lp-' ~ l,p~p tt
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : R ~ ~• L c~iVlS~~~
Contact Person: ~(~~ -R I a b~; ~ Phone Number: 1 S -- `~
For projects with multiple basins, specify which basin this worksheet applies to: ~~ Ly~S -7 1- ~
Permanent Pool Elevation ~~~_ ft, (elevation of the orifice invert out)
Temporary Pool Elevation _ 2G1 ~ ft. (elevation of the outlet structure invert in)
Bioretention Surface Area
Drainage Area
Impervious Area
Rational C Coefficient
Size
Inlet Velocity
Inlet flow depth
Depth to Ground Water
Planting Soil Infiltration Rate
In-Situ Soil Infiltration Rate
lDOC7 sq. ft.
X57. ac.
O~~
~~ fps
~ in
lam` .fi ft.
O ~52 in./hr.
~L?.prr tJ P 1p~ in./hr.
REQUIRED ITEMS CHECKLIST
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(either 5% in w/sand under drain or 7% in w/o)
(the soil layer down to 4 feet)
(the soil layer below 4 feet or below the sand bed)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package v~ilt result in a request for
additional information and will substantially delay final review and approval of the project.
A licants Initials
No vertical sand bed is proposed
~~The bioretention area is at least 40 feet by 15 feet.
'~~-~ ~~~ Sheet flow is provided at inlet.
Water table depth is greater than 6 feet.
G,LPcaC3 Minimum of 6" ponding is provided.
~~ The ponded area will draw down in less than 4 days.
~:~_Planting soil infiltration rate is greater than 0.52 in/hr.
The in-situ soil infiltration rate is greater than 0.2 in/hr.
A planting plan with species and densities is provided.
r{~ Mulch layer is specified in plans.
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
Plan details for the bioretention area provided.
Plan details for the inlet and outlet are provided.
- An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form maybe photocopied for use as an original.
DWO Stormwater Management Plan Review
A complete Stormwater management plan submittal includes a Stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 Sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name : ~05{'~1~~ ~- ~,~o~~w ~b~l ~
Contact Person: ~C~;n ', v r '~.\n ; v s~;,.J ~ r t
Phone Number: (~ I~l) ~~ ` ;--2 ~ r~c:~
For projects with multiple basins, specify which basin this worksheet applies to: ~~~" LU~ 5 ~ ~ ~7'2
(must match the DA # an the application c& plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type l~i~ ~rviy ~f
In-Situ Soil Infiltration Rate ~'- in./hr. (the most resn~icrive sort lave,-)
SHWT Elevation (~ ~" ft. (Seasonal High Water Table elevation)
Planting Soil Texture ~~1t. 1 ~ Can, (must be a sandy loam, loamy sand, or loam texture)
Planting Soil Infiltration Rate ~_ in./hr.
Basin Design Parameters
Drainage Area ~7r~;~ _ sq.f[. (u,i-sire and off=site drainnge ro the basi,i)
Impervious Area

Design Stortn ~. ~-~G-
_~_~
~
sq.tt. (o~z-.rrte and off=site drainage to the basin)

Design Volume
~~~ ~ inch (1.5 inch event for SA waters, 1 inch evens for others)
c
f
(
t
l

Inlet Velocity ,
~_ ,t> .
.
s
orage vo
ume required
fps
Drawdown Tirne 1 hours
Basin Elevations
Temporary Pool Elevation ~-`1C= fmsl (elevation of the bypass/outlet sn-ucrure)
Planting Elevation
Bottom Elevation l~ ~(
Z--~- fmsl (elevation of the ground surface bottom)
fmsl (elevation of the bottom of the planting media)
Basin Dimensions
Basin Size

Basin Volume Provided ~~"~_

-~'~v-- ft. x ~S ft. - ~~L~
sq. ft. (surface area at basin bottom)

c . f~.
SWU-108 4.07
Pagc 1 of 4

Basin Plantings
Number of plantings required ~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided ~ =Trees Z + Shrubs 7 (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request For additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
S~`~ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
!~l b. No vertical sand bed is proposed.
Sp ~ c. The bioretention area is at least 15 feet wide by 40 feet long.
~4/N~ .+~i94dC d. A grass buffer strip and sheet flow conditions are provided at the inlet.
~~~'~ e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~~~ f. Ponding depth of 6-12" is provided.
~p~ g. In-situ soils have a minimum. hydraulic conductivity of 0.52 inches per hour.
h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted ou the plans.
S~'~ j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
SP~a k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
Soil
1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
SWU-108 4.07
Page 2 of 4

' ~~~ m. Type of mulch layer and depth is specified on the plans.
J~~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
S /p/y o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
s,~~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
S~~ q. A benchmark is provided to determine the sediment accumulation in the basin area.
~~~ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~~ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
3. Remove accumulated sediment as needed to maintain good infiltration. When the filteri-ig capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to be reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris on an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: ~ r"t ~~<<~
Title: ~J~-s Oc61 X16 ~ L~ ~(~,
Address: g3~ ~ S tK '~ekS ~'L~Z ` ~k~6µ. ~L 2'7 61 ~
Phone: C°11 ni) 8 ~ o ' Io `~ ~ 9
Signature: tSh- ~~ ~
Date: 5 ' I~f-~ ~~'
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. ~ p ~f D
I, ~-~~+'y~-~ ~~ ~ ~-~{ ~V ~ , a Notary Public for the State of ~ ~10~`7"~ ~ ~t /tom ,
County of ~~- , do hereby certify that l~yin ~ k ~ rt..S
personally appeared before me this ~y day of j~Gti.Y pU~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
m~«°.~
R 4,
~~. ~~
.,~, .<. m-r,~.R,
~"~
~~~- ~
~~~~
~. „~
~~ ~~
1~ - ~ I ~
SEAL ~ L
My commission expires ~~ `~ S/ 020/ ~
SWU-108 4.07
Page 4 of 4

~~ ~~
Bioretention Sizing
Watershed Size
0.41 acres
Connected Impervious of Watershed
15%
Water Quality Storm
1.2 in
For Disconnected/Composite Area
Soil Type CN
0 A 49
0 B 69
1 C 79
0 D 84
79. Selected Curve Number
note: Select Soil Group with "1"
First Flush Runoff
~' 0.1.1... ac-in equation: based off SCS CN Method. No Composite CN
Average Ponding Depth
12 in
Surface Area
0.01 ac equation: Volume /Depth
390 sf
Fill Soil Choice
Nitrogen Removal -Sandy Loam
K= 1 in/hr Soil Type: 12% Fines (Silt+Clay), 82-85% Sand, 3-6% Organic
Other Pollutant Removal -Loamy Sand
K= 2 in/hr Soil Type: 8% Fines (Silt+Clay), 86-90% Sand, 2-4% Organic
K= 2 in/hr
Underdrains
Minimum Flow
equation: Q = 2.3E-5 " K ` A
0.02 cfs
Factor of Safety (range between 2 and 10)
4
Design Flow
Note to User:
Yellow Cells Require User Input
.Blue Cells Have Been Previously Determined
Pink Cells are Calculations within this Spreadsheet
Breakdown of Runoff
Connected Imperv RO 0.99 in
Composite RO (the rest) 0.13 in
0.06 ac-in
0.05 ac-in

~~;1~
,0:07 cfs
Manning's Roughness Coefficient
0.011 smooth wall
0.015 corrugated wall
0.011 n
Internal Slope (recommended minimum 0.5%)
0.5
Pipe(s) Diameter(s)
~~2;96 inches
equation: D = 16 * (Q * n * s^0.5)^(3/8)
# of 4" diam. # of 6" diam. calculations assume n=0.011
Underdrains Underdrains
2; 2
Note: A minimum of 2 underdrains recommended
Equivalent Pipe Diameters
D= (in) No. of 4" diam D= (in) No of 6" diam
5.13 2 7.84 2
5.95 3 9.11 3
6.66 4 10.13 4
7.22 5

~~ W
Formulating Pre- & Post- Development Hydrographs
utilize small watershed method &center-weighted storm (Malcom)
Location
Return Period
1=
Cpre
Cpost
A=
A=
Qpre=
Qpost=
Vol -Pre
Vol -Post
Tpre
Tpost
Raleigh/Durham
10 year
-7.22 in/hr (assumes Tc <= 5 min, check below)
0.4 (Rational C, see adjoining table)
0.8
0.41 acre
17859.6 sf Rainfall ..3.90 in (6 hr Depth)
1.2 cfs
2.4 cfs
1877 cf
3129 cf
19 min
16 min
Time
min Q- pre, Q
'cfs -post
fs
0 0.00 c
0.00
1 0.01 0.02
2 0.03 0.09
3 0.07 0.20
4 0.12 0.35
5 0.19 0.54
6 0.27 0.74
7 0.35 0.97
8 0.45 1.20
9 0.54 1.44
10 0.64 1.66
11 0.74 1.86
PRE CN 70 S= 4.29 Q*= 1.26 in
POST CN 82 S= 2.22II Q*= 2.10 in
(total pre-development runoff volume)
(total post-development runoff volume)
Time of Concentration (Kirpich Tc Equation)
Predevelopment
L 390 ft (Length of Overland Flow)
S 0.125 ft/ft (average overland slope)
tc 1.72 min bare soil
tc 3.44 min grassed
Post Development
L 390 ft (Length of Overland Flow)
S 0.125 ft/ft (average overland slope)
tc 1.72 min bare soil
tc 0.69 min asphalt/concrete
Note: Compare this to a 5 minute minimum.

~f~'~~
Hydrograph Routing through Bioretention
Watershed Area
Surface Area
Surface Area
Average Depth
Average Depth
Storage Volume
0.41 ac
Bioretention Outlet Control
0.01 ac
390 sf
12 in
1ft
390 cf
Surf. Infiltration Rate 2'`in/hr
If Sandy Loam, 1 in/hr,~ Loamy Sand, 2 in/hr
Volume lost to Exfl 65 cf/hr
Type Structure: Weir
Dimensions
length 3 ft
width 3 ft
Total Length ~~ ~~ 1~2~ ft
occupied by grate 0
Effective length 12 ft
Height above soil 1 2 in
Height 1.0 0 ft
Number of Outlets 1 outlets
Max Depth Over Grate 0.35'. ft
'Time . .;.Inflow Volume in Cum Vol in Depth Overflow Exfilfi VoC Out ?
min cfs cf cf ft cfs cf cf
0 0.00 0 0 0.00 0.00 0.00 0.00
1 0.02 1 1 0.00 0.00 1.08 1.08
2 0.09 6 6 0.01 0.00 1.08 1.08
3 0.20 12 17 0.04 0.00 1.08 1.08
4 0.35 21 37 0.10 0.00 1.08 1.08
5 0.54 32 68 0.17 0.00 1.08 1.08
6 0.74 45 112 0.29 0.00 1.08 1.08
7 0.97 58 169 0.43 0.00 1.08 1.08
8 1.20 72 240 0.62 0.00 1.08 1.08
9 1.44 86 325 0.83 0.00 1.08 1.08
10 1.66 100 423 1.09 0.91 1.08 55.59
11 1.86 112 480 1.23 3.98 1.08 239.70
12 2.04 122 362 0.93 0.00 1.08 1.08
13 2.19 131 493 1.26 4.86 1.08 292.66
14 2.29 137 337 0.87 0.00 1.08 1.08
15 2.35 141 477 1.22 3.82 1.08 230.40
16 2.37 142 389 1.00 0.00 1.08 1.08
17 2.34 140 528 1.35 7.60 1.08 457.15
18 2.26 136 207 0.53 0.00 1.08 1.08
19 2.14 129 334 0.86 0.00 1.08 1.08
20 1.99 119 453 1.16 2.32 1.08 140.42
21 1.83 110 422 1.08 0.86 1.08 52.72
22 1.69 101 471 1.21 3.41 1.08 205.70
23 1.56 93 359 0.92 0.00 1.08 1.08
24 1.43 86 444 1.14 1.84 1.08 111.43
25 1.32 79 411 1.06 0.47 1.08 29.08
26 1.22 73 455 1.17 2.48 1.08 149.63
27 1.12 67 373 0.96 0.00 1.08 1.08
28 1.03 62 434 1.11 1.36 1.08 82.85
29 0.95 57 408 1.05 0.36 1.08 22.84
30 0.88 53 438 1.12 1.55 1.08 94.17
31 0.81 48 392 1.01 0.02 1.08 2.00
32 0.74 45 435 1.11 1.40 1.08 85.27

~ ~'~
Bioretention Flow Mitigation
9.00
8.00
7.00
6.00
5.00
U
3 4.00
0
3.00
2.00
1.00
0.00
-1.00
Time (minutes)
Inflow (Post Dev Q) ~~ ~BR Outflow --®pre-dev

~i5
DWQ Project No,~,_ lp - ~ ~Q ~ `,p
DIVISION OF WATER QUALITY BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please comple e the following information):
Project Name : ~ ; t5 = _ ~
Contact Person: _~t~i ~-1 ~ Rc.kb~ ~~,.1 Phone Number:
For projects with multiple basins, specify which basin this worksheet a lies to: ~ ~ ~3-~ ~
PP }-S 3~-4 C3
Permanent Pool Elevation 2~ ft. (elevation of the orifice invert out)
Temporary Pool Elevation 2435 ft. (elevation of the outlet structure invert in)
Bioretention Surface Area
Drainage Area
Impervious Area
Rational C Coefficient
Size
1 q z i sq. ft.
- -2 ~ (72 ac.
IS`7. ac.
t:
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity
Inlet flow depth
Depth to Ground Water
Planting Soil Infiltration Rate
In-Situ Soil Infiltration Rate
II. REQUIRED ITEMS CHECKLIST
2- ° V fps
ll~ 3 in
(o` ~ ft.
C~ .52 in./hr
P~rirs Plat=, in./hr
(the soil layer down to 4 feet)
(the soil layer below 4 feet or below the sand bed)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
A licants Initials
No vertical sand bed is proposed
The bioretention area is at least 40 feet by 15 feet.
heet Flow is provided at inlet.
later table depth is greater than 6 feet.
inimum of 6" ponding is provided.
ie ponded area will draw down in less than 4 days.
anting soil infiltration rate is greater than 0.52 in/hr.
~e in-situ soil infiltration rate is greater than 0.2 in/hr.
planting plan with species and densities is provided.
alch layer is specified in plans.
anting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
Plan details for the bioretention area provided.
Plan details for the inlet and outlet are provided.
An operation and maintenance agreement signed and notarized by the responsible party is provided.

Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

Permit No.
(to be provided by UWQ)
State of North Carolina
Department of Environment and Natural Resources
llivision of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
BIORETENTION BASIN SUPPLEMENT
This form may be photocopied-for use as an original.
DWO stormwater Management Plan Review
A complete stormwater management plan submittal includes a stormwater management permit application, a
bioretention area supplement for each proposed system, sealed design calculations, a detailed soils report and 2 sets
of plans and specifications showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name: ~~~Q;~'1~;v ~~jC~~V1S\C,,.-~
Contact Person: L~~'1i Q .I ~lG~c_.k_l~:Y ~ Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to:~`~ ~-UtS 7~ - ~ l1
(must match the DA # on. the application & plans)
II. DESIGN INFORMATION Attach supporting calculations/documentation. Provide a written soils report
based on actual field investigations conducted by a qualified individual. The soils report should include
informational references to the County soils maps when available. All elevations shall be in feet mean sea level
(fmsl).
Soils Report Summary
In-Situ Soil Type ~,pQ.n-t,
In-Situ Soil Infiltration Rate __~.___ in./hr. ('the most restrictive soil layer)
SHWT Elevation _ o+ ft. (Seasonal High Water Table elevation)
Planting Soil Texture Sc,~u Lt, c< w.
(must be a sandy loam, loamy sand, or loam texture)
Planting Soil Infiltration Rate I in./hr.
Basin Design Parameters
Drainage Area
Impervious Area ~ ~~__~~~ ~__ sq.tl. (al-sire and off=site drairurge to the basin)
~~3 ; i ~j ~
f
'

Desig^ Storm sq.
t. (
on-sire and off=sire drama >
~~ to the basin)
I

Desig^ Volume inch (1.5 inch event for SA waters, 1 inch event for others)
I 2
J

Inlet Velocity .
c.f. (storage volu~~rae required)
2 .C> fps
Drawdown Time 2 hours
Basin Elevations
Temporary Pool Elevation
Planting Elevation 2~tS fmsl (elevation ofthe bypass/outlet structau-e)
fmsl
~~
l
i

Bottom Elevation -
z (e
evat
on of the groiuid surface bottom)
~~ . fm
l
l
s
(e
evation of the bottom of the planting media)
Basin Dimensions
Basin Size

Basin Volume Provided ~ ~ ft. x Z.~ ft. _
- ~~~~ sq. ft. (surface area at basin bottom)
2ti
2C
-
~
, c.f
.
SWU-108 4.07
Page I of ~

Basin Plantings
Number of plantings required ~~ stems (400 stems per acre of bioretention area is required at a minimum)
Total No. of plantings provided Z ~~ =Trees 3 + Shrubs ~ ~ (at least 1 tree for every 3 shrubs)
This system (check one) does does not incorporate the use of an under-drain.
(Under-drains are not allowed for those projects that drain to class SA waters.)
III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Stormwater Best Management Practice
Manual and Administrative Code Section: 15A NCAC 2H .1000. These requirements are subject to change in
accordance with the manual and rules.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If a requirement has not been met, attach written justification. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and
approval of the project.
Applicant's Initials
~~'~ a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
S~ti~ b. No vertical sand bed is proposed.
~!y c. The bioretention area is at least 15 feet wide by 40 feet long.
~lL~r/~IS-~ty~ .~~lf d. A grass buffer strip and sheet flow conditions are provided at the inlet.
si©/~' e. Seasonal High Water table depth is at least 2 feet below the planting elevation surface.
~O~ f. Ponding depth of 6-12" is provided.
~~y g. In-situ soils have a minimum hydraulic conductivity of 0.52 inches per hour.
SP~~ h. An in-depth soils report is provided. (report should include soil types, boring log, map,
suitability for placement of the control system, seasonal high water table, infiltration rate, etc.)
Self i. The planting soil has a minimum hydraulic conductivity of 0.52 inches per hour. The type and
placement specifications of the planting media are noted on the plans.
~~lf j. The planting soil meets minimum soil specifications per the latest version of the NCDENR
Stormwater Best Management Practices Manual, including a low phosphorus content to
promote phosphorus removal. (P-Index of 20 to 40 is optimal.) Include a soils test, indicating
P-Index, from a certified lab for those projects draining to Nutrient Sensitive Waters.
~~~ k. System is designed to draw down the design storage volume to the proposed bottom elevation
under seasonal high water conditions within 24 hours. Draw down calculations are attached.
~~~ 1. A detailed planting plan, prepared by a qualified individual, is provided on the plans. This plan
shall indicate a variety of suitable species, location, spacing, soil preparation, fertilizer
requirements, installation procedures, construction schedule, etc..
S\vU-108 4.07
Page 2 of 4

~Py m. Type of mulch layer and depth is specified on the plans.
S~l~ n. Plan and section details for the bioretention area are provided. (including dimensions and
elevations)
`self o. Plan details for the inlet and outlet structures are provided. (including dimensions and
elevations)
~'~~ p. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
sPy1 q. A benchmark is provided to determine the sediment accumulation in the basin area.
~~~/ r. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
~'~f~ s. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
~~f~ t. Plans ensure that the installed system will meet design specifications (constructed or restored)
upon initial operation once the project is complete and the entire drainage area is stabilized.
IV. BIORETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT
Records of maintenance items to include dates, inspector's name, type of maintenance, etc. shall be kept and made
available to Division staff upon request. Maintenance activities shall be performed as follows:
1. Inspect the bioretention area system for soil and mulch erosion, vegetated cover, and general condition after
every significant runoff producing rainfall event and at least monthly. Remove trash as needed.
2. Repair eroded areas immediately, re-seed, re-plant, and re-mulch as necessary to maintain good vegetative and
mulch cover.
Remove accumulated sediment as needed to maintain good infiltration. When the filtering capacity diminishes
substantially (e.g., when water ponds on the surface for more than 24 hours), the top few inches of material must
be removed and replaced with fresh planting soil material. Regardless of infiltration capacity, accumulated
sediment in the bioretention basin shall be removed when the depth is reduced to 75% of the original design
depth. The system shall be restored to the original design depth without over-excavating. Over-excavating may
cause the required water table separation to he reduced and may compromise the ability of the system to perform
as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a
manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
4. Replace, or add additional mulch as needed. Removal of the old mulch layer before applying the new layer is
recommended every 2 to 3 years.
5. Prune trees and shrubs and remove debris nn an annual basis. Grassed vegetation should not exceed 6 inches in
height.
6. Treat all diseased trees and shrubs whenever needed. Remove and replace all dead and diseased vegetation
considered beyond treatment every 6 months.
7. Replace support stakes yearly (in the spring). Replace deficient stakes or wires whenever needed.
SWU-108 4.07
Page 3 of 4

8. Soil testing shall be conducted annually to determine pH and any accumulation of toxins in the planting media.
Lime or other alkaline substances shall be applied as recommended per the soil test and toxic soils shall be
removed, disposed of properly and replaced with new planting media.
9. All components of the bioretention area system shall be maintained in good working order.
10. If the Division determines that the system is failing, the system will immediately be repaired to original design
specifications. If the system cannot be repaired to perform its design function, other stormwater control devices
as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the ten 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.
Print name: l ~ W ~ ~I ~S
Title:
Address: ~ 2i .~ ~ S Lk ~ 1'zt~ S /~ ~ 1,a v (2/1f~C~} If C.~ 'C'1 b~j
Phone:
Signature:

Date: ~ ' I ~ ~ ~ ~
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, U7 VC..-' (C.~..~{ l(~r , a Notary Public for the State of IIArT h ~1b `II'I ,
County of ~Gt.~-- , do hereby certify that ~ ~ 07r~ ~ n- S
personally appeared before me this ~_day of 1" L Q.I. D ~ ,and acknowledge the
due execution of the forgoing bioretention basin maintenance requirements. Witness my hand and official seal,
~~~ 3~FC ~2, ~~ `~c ~ J""¢
~ y`
~~ ~' ~
~~ ~~ ~ , ~~~~o
~~~~~"
SEAL ~~
My commission expires t ~ l ~5'O2a'D
SWU-108 4.07
Page 4 of 4
%~

PAZ
if
_jix
At 41
1p,
, PT
. it L*1
A4.
IZ
Is.
i.r o
ALS

~~
Bioretention Sizing
Watershed Size
2A2 acres
Connected Impervious of Watershed
15%
Water Quality Storm
1.2 in
For Disconnected/Composite Area
Soil Type CN
0 A 49
0 B 69
1 C 79
0 D 84
79 Selected Curve Number
note: Select Soil Group with "1"
First Flush Runoff
~~'~~' ~`~"0:~3' ac-in equation: based off SCS CN Method. No Composite CN
Average Ponding Depth
12 in
Surface Area
0.04 ac equation: Volume /Depth
1921 sf
Fill Soil Choice
Nitrogen Removal -Sandy Loam
K= 1 in/hr Soil Type: 12% Fines (Silt+Clay), 82-85% Sand, 3-6% Organic
Other Pollutant Removal -Loamy Sand
K= 2 in/hr Soil Type: 8% Fines (Silt+Clay), 86-90% Sand, 2-4% Organic
K= 2 in/hr
Underdrains
Minimum Flow
equation: Q = 2.3E-5 * K * A
0.09 cfs
Factor of Safety (range between 2 and 10)
4
Design Flow
Note to User:
Yellow Cells Require User Input
Blue Cells Have Been Previously Determined
Pink Cells are Calculations within this Spreadsheet
Breakdown of Runoff
Connected Imperv RO 0.99 in
Composite RO (the rest) 0.13 in
0.30 ac-in
0.23 ac-in

~~ ~s
cfs
Manning's Roughness Coefficient
0.011 smooth wall
0.015 corrugated wall
0.011 n
Internal Slope (recommended minimum 0.5%)
0.5
Pipe(s) Diameter(s)
5.39 inches
equation: D = 16 ' (Q * n ' s^0.5)^(3/8)
# of 4" diam. # of 6" diam. calculations assume n=0.011
Underdrains Underdrains
3 2
Note: A minimum of 2 Underdrains recommended
Equivalent Pipe Diameters
D= (in) No. of 4" diam D= (in) No of 6" diam
5.13 2 7.84 2
5.95 3 9.11 3
6.66 4 10.13 4
7.22 5

Y~~'(~S
Formulating Pre- & Post- Development Hydrographs
utilize small watershed method &center-weighted storm (Malcom)
Location
Return Period
1=
Cpre
Cpost
A=
A=
Qpre=
Qpost=
Vol -Pre
Vol -Post
Tpre
Tpost
Raleigh/Durham
10 year
7:22 in/hr (assumes Tc <= 5 min, check below)
0.4 (Rational C, see adjoining table)
0.6
2.02 acre
87991.2 sf Rainfall 3.90 in (6 hr Depth)
5.8 cfs
8.8 cfs
9245 cf
15416 cf
19 min
21 min
Time Q- pre Q-post
min cfs cfs
0 0.00 0.00
1 0.04 0.05
2 0.16 0.19
3 0.35 0.43
4 0.62 0.75
5 0.94 1.16
6 1.32 1.63
7 1.75 2.17
8 2.20 2.75
9 2.68 3.37
10 3.16 4.01
11 3.63 4.66
PRE CN 70 S= 4.29 Q*= 1.26 in
POST CN 82 S= 2.22II Q*= 2.10 in
(total pre-development runoff volume)
(total post-development runoff volume)
Time of Concentration (Kirpich Tc Equation)
Predevelopment
L 720 ft (Length of Overland Flow)
S 0.258 ft/ft (average overland slope)
tc 2.08 min bare soil
tc 4.17 min grassed
Post Development
L 720 ft (Length of Overland Flow)
S 0.258 ft/ft (average overland slope)
tc 2.08 min bare soil
tc 0.83 min asphalt/concrete
Note: Compare this to a 5 minute minimum.

~ is
Hydrograph Routing through Bioretention
Watershed Area
Surface Area
Surface Area
Average Depth
Average Depth
Storage Volume
2.02 ac
0.04 ac
..1921 sf
12 in
1 ft
1921 cf
Bioretention Outlet Control
Surf. Infiltration Rate 2 in/hr
If Sandy Loam, 1 in/hr, Loamy Sand, 2 in/hr
Volume lost to Exfl 320 cf/hr
Type Structure: Weir
Dimensions
length 3 ft
width 3 ft
Total Length 12 ft
occupied by grate 0
Effective length 12 ft
Height above soil 12 in
Height 1.00 ft
Number of Outlets 1 outlets
Max Depth Over Grate 0.39 ft
:.Time Inflow Volume in Cum Vol in Depth Overflow Ex filt Vol Out
min cfs cf cf ft cfs c f cf
0 0.00 0 0 0.00 0.00 0.00 0.00
1 0.05 3 3 0.00 0.00 2.90 2.90
2 0.19 12 12 0.01 0.00 5.34 5.34
3 0.43 26 32 0.02 0.00 5.34 5.34
4 0.75 45 72 0.04 0.00 5.34 5.34
5 1.16 69 136 0.07 0.00 5.34 5.34
6 1.63 98 228 0.12 0.00 5.34 5.34
7 2.17 130 353 0.18 0.00 5.34 5.34
8 2.75 165 512 0.27 0.00 5.34 5.34
9 3.37 202 709 0.37 0.00 5.34 5.34
10 4.01 241 945 0.49 0.00 5.34 5.34
11 4.66 280 1219 0.63 0.00 5.34 5.34
12 5.31 318 1532 0.80 0.00 5.34 5.34
13 5.93 356 1883 0.98 0.00 5.34 5.34
14 6.52 391 2268 1.18 2.77 5.34 171.37
15 7.06 424 2521 1.31 6.28 5.34 381.96
16 7.54 453 2591 1.35 7.42 5.34 450.44
17 7.96 477 2618 1.36 7.87 5.34 477.51
18 8.29 497 2638 1.37 8.21 5.34 497.82
19 8.54 512 2652 1.38 8.46 5.34 512.69
20 8.69 521 2661 1.39 8.61 5.34 521.88
21 8.75 525 2664 1.39 8.67 5.34 525.24
22 8.71 523 2662 1.39 8.62 5.34 522.77
23 8.58 515 2654 1.38 8.49 5.34 514.58
24 8.36 501 2641 1.37 8.26 5.34 500.91
25 8.04 483 2623 1.37 7.95 5.34 482.12
26 7.65 459 2600 1.35 7.56 5.34 458.68
27 7.21 432 2573 1.34 7.12 5.34 432.69
28 6.78 407 2547 1.33 6.70 5.34 407.38
29 6.37 382 2522 1.31 6.30 5.34 383.57
30 5.99 360 2498 1.30 5.93 5.34 361.15
31 5.64 338 2475 1.29 5.58 5.34 340.06
32 5.30 318 2453 1.28 5.25 5.34 320.21

~~ ~~
Bioretention Flow Mitigation

~2
DWQ Project No. U~ _ ~ ~(~ ~
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : (~o;~.rrxsv~. ~~~dw is~o~-,
Contact Person: 'Dow~%2i ~ ~:r,-1 Phone Number:
Level Spreader ID: :~-Z `~r~e~t- f~ ~' 2- -+ t:s ~
Level Spreader Length (~ ft,
Drainage Area ~l-~ t ac.
Impervious Area t~ .--1 Z ac.
Forebay Area ~ 3 cu ft
Maximum Filter Strip/Buffer Slope 3 +-t
grass
Max. Discharge from 1 "/Hr Storm 1 ~ `.1 ~ cfs
Max. Discharge to Level Spreader ~ ~ ~ cfs
Filter Strip/ Zone 2 Buffer Vegetation YV1 I x ~`~
Pre-treatment or Bypass Method Used `~~1 ~ fife v' ~ ~ v~t'v~t~:
REQUIRED ITEMS CHECKLIST
~ yCu
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested, leaf littler cover, 8% for thick ground cover
(thick ground cover or grass; canopied forest with leaf litter
groundcover)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Applicants Initials
P_R(?, Project Site was visited prior to designing level spreader.
~Tj `~=~~~ Date of the Site visit. PLEASE ATTACH TIME-DATED DIGITAL PHOTO OF EXISTING BUFFER CONDITIONS.
~~ Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 65 ft per cfs in canopied forest with leaf
litter for 50-foot buffer; 50 ft per cfs for 100-foot buffer, or 40 ft. per cfs for 150-foot buffer.
Rte; Pre-Formed Scour Holes are on flat slopes only.
~-A-C-3 No structures are located in protected buffers (must meet no practical alternatives criteria).
Design Alternative (if any) and Bypass method used:
t~13 Bypass conveyance method is specified and plan details and calculations are provided.
f~ I ~ Alternative design option is specified and plan details and calculations are provided.
F'-~~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
F-~t~f'~ No structures are located in protected buffers.
~=i4(3 Plan details for the bypass and outlets are provided.
~~ The operation and maintenance agreement includes annual erosion and vegetation repair.
(?~~ The operation and maintenance agreement signed and notarized by the responsible party is provided.

Gi �,
I

DWQ Project No. '~lQ' I ~QIQ~p
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : ~~ ` f Y'1G~Gr ~E~lndiy ~ S~ ~~-t
Contact Person: ~Y1_ e~ a 'ia,~~~y~,,J~ ,,~ Phone Number )~) ~~,' y - ;Zc~~L
Level Spreader ID: ~i-lP Ln-f ~ Z (~
Level Spreader Length ~~ ft. (perpendicular to flow)
Drainage Area .t7 ac. (on-site and off-site drainage to the level spreader)
Impervious Area _ h 6 I ac. (on-site and off-site drainage to the level spreader)
Forebay Area 'rl cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope _ lCL_~ % (6% for forested, leaf littler cover, 8% for thick ground cover
grass
Max. Discharge from 1 "/Hr Storm t • u j cfs
Max. Discharge to Level Spreader _ ( 3Y, cfs
Filter Strip/ Zone 2 Buffer Vegetation ~jX -1.~-
Pre-treatment or Bypass Method Used S I`T I ~-/ ~ J (,~'Z
II. REQUIRED ITEMS CHECKLIST
(thick ground cover or grass; canopied forest with leaf litter
groundcover)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Project Site was visited prior to designing level spreader.
rDate of the Site visit. PLEASE ATTACH TIME-DATED DIGITAL PHOTO OF EXISTING BUFFER CONDITIONS.
_Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 65 ft per cfs in canopied forest with leaf
litter for 50-foot buffer; 50 ft per cfs for 100-foot buffer, or 40 ft. per cfs for 150-foot buffer.
,Pre-Formed Scour Holes are on flat slopes only.
No structures are located in protected buffers (must meet no practical alternatives criteria).
Design Alternative (if any) and Bypass method used:
Bypass conveyance method is specified and plan details and calculations are provided.
..a .
Alternative design option is specified and plan details and calculations are provided.
_Uischarge to level spreader and subsequent filter strip is hydraulically and spatially separate from fhe bypass
discharge.
No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.

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`~
DWQ Project No, ~._ ~ ~`p~p
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name: ~b.:2_rv~-JOr `-.~.bC~'~ii5i~+~-1
Contact Person: ~'1 ~ ~` to\~c_.k_l~~ ,~ n Phone Number. (~I~) S~ ~- Zc c~~
Level Spreader ID: ~$' 1 ~ c Il.o+ a5 SdYZ~t f~
Level Spreader Length ~ ~~=' ft,
Drainage Area ,~0~2 ac.
Impervious Area (~=~-I I ac.
Forebay Area Flo cu ft.
Maximum Filter Strip/Buffer Slope ~ ~ S
grass
Max. Discharge from 1"/Hr Storm I ~ ~`f cfs
Max. Discharge to Level Spreader _ ~- cfs
Filter Strip/ Zone 2 Buffer Vegetation 1.~ ~ k
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested, leaf littler cover, 8% for thick ground cover
(thick ground cover or grass; canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method Used ~~~~~ ~ St.~~-~~
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Applicants Initials
Project Site was visited prior to designing level spreader.
C~l "ZC:x-' Date of the Site visit. PLEASE ATTACH TIME-DATED DIGITAL PHOTO OF EXISTING BUFFER CONDITIONS.
(Z-Y~t Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 65 ft per cfs in canopied forest with leaf
~`~~~ litter for 50-foot buffer; 50 ft per cfs for 100-foot buffer, or 40 ft. per cfs for 150-foot buffer.
Pre-Formed Scour Holes are on flat slopes only.
No structures are located in protected buffers (must meet no practical alternatives criteria).
Design Alternative (if any) and Bypass method used:
~' ~~~ Bypass conveyance method is specified and plan details and calculations are provided.
`tom Alternative design option is specified and plan details and calculations are provided.
~~`~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
_ discharge.
~~~ No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
ti~~ The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.

75
61
NA, • w",
4A.
f+4 i * 0&4,�
_Ji
07/05/2007
YN
Im
t.V- iA

DWQ Project No. ~CO'l UJ (!~ W
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name
Contact Person:
Level Spreader ID:
Level Spreader Length ~~ ff. (perpendicular to flow)
Drainage Area ac. (on-site and off-site drainage to the level spreader)
Impervious Area ac. (on-site and off-site drainage to the level spreader)
Forebay Area '' cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope (0 > % (6% for forested, leaf littler cover, 8% for thick ground cover
grass
Max. Discharge from 1"IHr Storm (~•5~ cfs
Max. Discharge to Level Spreader D• 7 cfs
Filter Stripl Zone 2 Buffer Vegetation /Y1Z XCI~ (thick ground cover or grass; canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method Used :~ 13 ~' ,-r N JIN~~I~
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
A licants Initials
Project Site was visited prior to designing level spreader.
5 7 Zap 7 Date of the Site visit. PLEASE ATTACH TIME-DATED DIGITAL PHOTO OF EXISTING BUFFER CONDITIONS.
Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 65 ft per cfs in canopied forest with leaf
litter for 50-foot buffer; 50 ft per cfs for 100-foot buffer, or 40 ft. per cfs for 150-foot buffer.
Pre-Formed Scour Holes are on flat slopes only.
No structures are located in protected buffers (must meet no practical alternatives criteria).
Design Alternative (if any) and Bypass method used:
/~ Bypass conveyance method is specified and plan details and calculations are provided.
N ~ Alternative design option is specified and plan details and calculations are provided.
~(3 Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
I'~ The operation and maintenance agreement signed and notarized by the responsible party is provided.

7Z

~~Z
DWQ Project No. ~~~-"~ ~ LQ~U/
DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : V
Contact Person: ~f 1~2- -rVi Phone Number:
Level Spreader ID: ~$ I ~ L1~T (nom
Level Spreader Length ~~ ft,
Drainage Area (~ , ~lP ac.
Impervious Area t~ a 115 ac.
Forebay Area I C~, ~cu ft
Maximum Filter Strip/Buffer Slope '+. ~
grass
Max. Discharge from 1 "IHr Storm (7. ~32 cfs
Max. Discharge to Level Spreader D ~ -hC~ cfs
Filter Strip/ Zone 2 Buffer Vegetation M ~ x
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested, leaf littler cover, 8% for thick ground cover
(thick ground cover or grass; canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method Used ~ 1 ('t/ ' T SV~CIIe-
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
A licants I 'tials
Project Site was visited prior to designing level spreader.
~~ " '~1 Date of the Site visit. PLEASE ATTACH TIME-DATED DIGITAL PHOTO OF EXISTING BUFFER CONDITIONS.
Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 65 ft per cfs in canopied forest with leaf
litter for 50-foot buffer; 50 ft per cfs for 100-foot buffer, or 40 ft. per cfs for 150-foot buffer.
Pre-Formed Scour Holes are on flat slopes only.
No structures are located in protected buffers (must meet no practical alternatives criteria).
Design Alternative (if any) and Bypass method used:
Bypass conveyance method is specified and plan details and calculations are provided.
Alternative design option is specified and plan details and calculations are provided.
,~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
``r' No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
~"% The operation and maintenance agreement includes annual erosion and vegetation repair.
~, The operation and maintenance agreement signed and notarized by the responsible party is provided.

Ed
c
4VA