SW3170402_HISTORICAL FILE_20170608

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMM DD

YARBROUGH WILLIAMS & HOULE, INC.
Planning • Surveying • Engineering
NCBELS C-0475
SC COA332
STORM DRAINAGE CALCULATIONS
AND
CORRUGATED METAL
PIPE DETENTION
AT
Henn Project
November 21, 2016
Rev. March 29.2017
�b
CR
`o
o
• Storm Drainage Calculations
• Erosion Control Calculations
• Detention Calculations (Hydrocad /
Detention Results)
730 Windsor Oak Court, Charlotte, NC 28273 e P.O. Box 1198, Pineville, NC 28134 0 704556.1990 c fax [phone]

Skimmer Size Calculation
Skimmer Size Head on Orifice
1.5
0.125
2
0.167
2.5
0,208
3
0.25
4
0.333
5
0.333
6
0.417
8
0.5
Dewatering
Dewaterin
Skimmer
Head on
Volume of water
time in days
Flow Rate
Orifice Dia.
Orifice Dia.
mmer Basin #
Size (in)
Orifice (ft)
V (cf)
to (days)
Qd (cf/day)
Calc. D ( in)
Actual D (in)
1
1.5
0.13
6,201
3
2067
1.59
1.5

PO .BOX 7007
CHARLOTTE, N.C. 28241
Phone: [phone] YARBROUGH-WILLIAMS & HOULE, INC.
Fax: [phone] Planning • Surveying • Engineering
'ROJECT NAME :
j Henn Project
DATE:
I Oct. 24, 2016
NEW YORK STANDARDS RIP RAP APRON NOMOGRAPH [ Tw < 0.5(Do) ]
R.R.I.F.P = Rip Rap For Inlet Protection
RIP RAP APRON DESIGN
MINIMUM RIP RAP
RIP RAP
OUTLET
STRUCTURE
VEL.
I APRON i
RIP RAP
DEPTH (IN)
FLOW
NO.
FT/SEC
DIMENSIONS
D 50 (IN)
W/ FABRIC
CFS
WIDTH
x
LENGTH

YARBROUGH-WILLIAMS & HOULE, INC.
Planning - Surveying • Engineering
P. O .BOX 1198
MATTHEWS, NC 28241
Phone: [phone]
Dry Pond Calculations Fax: [phone]
Date : Nov. 21, 2016 Rev. 3.27.17
PROJECT: Henn Project, Detention with Corrugated Metal Pipe
Results of Preliminary Hydrologic Calculations
(From Computer Model Results Using SCS Hydrologic Procedures)
Condition Runoff
Q 1.y„r
Q z.r,a,
Qla,.r
cfs
cfs
cfs
Pre -development Flow
0.14
0.41
1.61
Post Develo ment Detained
0.10
0.18
1.09

47S v 48P
Site
Subcat Reach Pon Lij
Pipe Storage

Henn Project Underground Detention Charlotte 6-hr 1 INCH finch Rainfall=1.00"
Prepared by Microsoft Printed 3/30/2017
HydroCAD® 10.00 s/n 05047 © 2013 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 47S: Site
Runoff = 1.57 cfs @ 3.11 hrs, Volume= 0.060 af, Depth= 0.79"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 1 INCH finch Rainfall=1.00"
Area (ac) CN Description
0
w
0.910 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
5.0 Direct Entry, Tc
Subcatchment 47S: Site
Hydrograph
1.57 ofs
Charlotte 6-hr
1 INCH
1 inch Rainfall=1.00"
Runoff Area=0.910 ac
Runoff Volume=0.060 of
Runoff Depth=0.79"
Tc=5.0 min
CN=98
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 160
Time (hours)
— Runoff

Henn Project Underground Detention Charlotte 6-hr 1 INCH cinch Rainfall=1.00"
Prepared by Microsoft Printed 3/30/2017
HydroCAD@ 10.00 s/n 05047 @ 2013 HydroCAD Software Solutions LLC Page 3
Summary for Pond 48P: Pipe Storage
Inflow Area = 0.910 ac,100.00% Impervious, Inflow Depth = 0.79" for finch event
Inflow = 1.57 cfs @ 3.11 hrs, Volume= 0.060 of
Outflow = 0.10 cfs @ 2.65 hrs, Volume= 0.060 af, Atten= 94%, Lag= 0.0 min
Primary = 0.10 cfs @ 2.65 hrs, Volume= 0.060 of
Routing by Stor-Ind method, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs / 3
Peak Elev= 599.99' @ 3.93 hrs Surf.Area= 0 sf Storage= 1,570 cf
Plug -Flow detention time= 147.6 min calculated for 0.060 of (100% of inflow)
Center -of -Mass det. time= 147.5 min ( 348.3 - 200.8 )
Volume Invert
Avail.Storage Storage Description
#1 598.00'
8,093 cf Custom Stage Data Listed below
Elevation Cum -Store
(feet) (cubic -feet)
598.00
0
599.00
584
600.00
1,582
601.00
2,772
602.00
4,046
603.00
5,321
604.00
6,511
605.00
7,509
606.00
8,093
Device Routing
Invert
Outlet Devices
#1 Primary
596.50'
15.0" Round Culvert L= 10.6' Ke= 0.500
Inlet / Outlet Invert= 596.50' / 596.00' S= 0.0472'/' Cc= 0.900
n= 0.012, Flow Area= 1.23 sf
#2 Device 1
598.00'
0.100 cfs Constant Flow/Skimmer
#3 Device 1
602.40'
4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1
604.20'
4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
PrimaryOutFlow Max=0.10 cfs @ 2.65 hrs HW=598.08' (Free Discharge)
L7=Culvert (Passes 0.10 cfs of 5.79 cfs potential flow)
2=Constant Flow/Skimmer (Constant Controls 0.10 cfs)
3=Orifice/Grate ( Controls 0.00 cfs)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)

Henn Project Underground Detention Charlotte 6-hr 1 INCH linch Rainfall=1.00"
Prepared by Microsoft Printed 3/30/2017
HydroCAD® 10.00 s/n 05047 © 2013 HydroCAD Software Solutions LLC Page 4
Pond 48P: Pipe Storage
Hydrograph
— Inflow
— Pnmary
Time (hours)

Henn Project Underground Detention Type II 24-hr 2 yr 24 hr Rainfall=3.12"
Prepared by Microsoft Printed 3/29/2017
HydroCAD® 10.00 s/n 05047 © 2013 HVdroCAD Software Solutions LLC Page 1
Summary for Subcatchment 49S: Pre-Dev.
Runoff = 0.41 cfs @ 12.02 hrs, Volume= 0.028 af, Depth= 0.41"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs
Type 11 24-hr 2 yr 24 hr Rainfall=3.12"
Area (ac) CN Description
0.810 61 >75% Grass cover, Good, HSG B
0.810 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
5.7 150 0.0200 0.44 Sheet Flow, Pre-Dev
Fallow n= 0.050 P2= 3.12"
1.8 130 0.0300 1.21 Shallow Concentrated Flow, Pre-Dev.
Short Grass Pasture Kv= 7.0 fos
7.5 280 Total

Henn Project Underground Detention Type 1124-hr 10 yr 24 hr Rainfall=4.80"
Prepared by Microsoft Printed 3/29/2017
HvdroCAD® 10.00 s/n 05047 02013 HvdroCAD Software Solutions LLC Pnoe 2
Summary for Subcatchment 49S: Pre-Dev.
Runoff = 1.61 cfs @ 12.00 hrs, Volume= 0.084 af, Depth= 1.25"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr 24 hr Rainfall=4.80"
Area (ac) CN Description.
0.810 61 >75% Grass cover, Good, HSG B
0.810 100.00% Pervious Area
Tc
Length
Slope
Velocity
Capacity Description
(min)
(feet)
(ft/ft)
(ft/sec)
(cfs)
5.7
150
0.0200
0.44
Sheet Flow, Pre-Dev
Fallow n= 0.050 P2= 3.12"
1.8
130
0.0300
1.21
Shallow Concentrated Flow, Pre-Dev.
Short Grass Pasture Kv= 7.0 fos
7.5 280 Total

47S -v 48P
Site
Subcat Reach Pon iLI _�i
Pipe Storage

Henn Project Underground Detention Charlotte 24-hr 1-yr 1 yr 24 hr Rainfall=2.58"
Prepared by Microsoft Printed 3/29/2017
HydroCAD® 10.00 s/n 05047 ©2013 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 47S: Site
Runoff = 2.81 cfs @ 11.98 hrs, Volume= 0.178 af, Depth= 2.35"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs
Charlotte 24-hr 1-yr 1 yr 24 hr Rainfall=2.58"
Area (ac) CN
0.910 98
0.910 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (fUsec) (cfs)
5.0 Direct Entry, Tc
Subcatchment 47S: Site
Hydrograph
Charlotte 24-hr 1-yr
1 yr 24 hr Rainfall=2.58"
Runoff Area=0.910 ac
Runoff Volume=0.178 of
Runoff Depth=2.35"
Tc=5.0 min
CN=98
rime (hours)
— Runoff

Henn Project Underground Detention Charlotte 24-hr 1-yr 1 yr 24 hr Rainfall=2.58"
Prepared by Microsoft Printed 3/29/2017
HydroCAD® 10.00 s/n 05047 @ 2013 HydroCAD Software Solutions LLC Page 3
Summary for Pond 48P: Pipe Storage
Inflow Area = 0.910 ac,100.00% Impervious, Inflow Depth = 2.35" for 1 yr 24 hr event
Inflow = 2.81 cfs @ 11.98 hrs, Volume= 0.178 of
Outflow = 0.10 cfs @ 10.55 hrs, Volume= 0.178 af, Atten= 96%, Lag= 0.0 min
Primary = 0.10 cfs @ 10.55 hrs, Volume= 0.178 of
Routing by Stor-Ind method, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs / 3
Peak Elev= 601.89' @ 13.85 hrs Surf.Area= 0 sf Storage= 3,910 cf
Plug -Flow detention time= 335.6 min calculated for 0.178 of (100% of inflow)
Center -of -Mass det. time= 335.6 min ( 1,094.6 - 759.0)
Volume Invert Avail.Storage Storage Description
#1 598.00' 8,093 cf Custom Stage Data Listed below
Elevation Cum.Store
(feet) (cubic -feet)
598.00 0
599.00
584
600.00
1,582
601.00
2,772
602.00
4,046
603.00
5,321
604.00
6,511
605.00
7,509
606.00
8,093
Device Routing
Invert
Outlet Devices
#1 Primary
596.50'
15.0" Round Culvert L= 10.6' Ke= 0.500
Inlet / Outlet Invert= 596.50' / 596.00' S= 0.0472'/' Cc= 0.900
n= 0.012, Flow Area= 1.23 sf
#2 Device 1
598.00'
0.100 cfs Constant Flow/Skimmer
#3 Device 1
602.40'
4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1
604.20'
4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
PrimaryOutFlow Max=0.10 cfs @ 10.55 hrs HW=598.08' (Free Discharge)
L1=Culvert (Passes 0.10 cfs of 5.78 cfs potential flow)
2=Constant Flow/Skimmer (Constant Controls 0.10 cfs)
3=Orifice/Grate ( Controls 0.00 cfs)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)

Henn Project Underground Detention Charlotte 24-hr, 1-yr 1 yr 24 hr Rainfall=2.58"
Prepared by Microsoft Printed 3/29/2017
HydroCAD® 10.00 s/n 05047 ©2013 HydroCAD Software Solutions LLC Page 4
Pond 48P: Pipe Storage
Hydrograph I .
— Inflow
— Primary
Inflow Area=0.910 ac
Peak Elev=601.89'
Storage=3;910 cf
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Time (hours)

Henn Project Underground Detention Type II 24-hr 2 yr 24 hr Rainfall=3.12"
Prepared by Microsoft Printed 3/29/2017
HydroCAD@ 10.00 s/n 05047 @ 2013 HydroCAD Software Solutions LLC Page 5
Summary for Subcatchment 47S: Site
Runoff = 4.05 cfs @ 11.95 hrs, Volume= 0.219 af, Depth= 2.89"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs
Type II 24-hr 2 yr 24 hr Rainfall=3.12"
Area (ac) CN Description
0.910 98
0.910 100.00% Impervious Area
Tc Length Slope
5.0
Description
Direct Entry, Tc
Subcatchment 47S: Site
Hydrograph
Type II 24-hr
2 yr 24 hr Rainfall=3.12"
Runoff Area=0.910 ac
Runoff Volume=0.219 of
Runoff Depth=2.89"
Tc=5.0 min
CN=98
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Time (hours)
— RunoH

Henn Project Underground Detention
Prepared by Microsoft
Type 11 24-hr 2 yr 24 hr Rainfall=3.12"
Summary for Pond 48P: Pipe Storage
Printed 3/29/2017
Inflow Area = 0.910 ac,100.00% Impervious, Inflow Depth = 2.89" for 2 yr 24 hr event
Inflow = 4.05 cfs @ 11.95 hrs, Volume= 0.219 of
Outflow = 0.18 cfs @ 13.07 hrs, Volume= 0.219 af, Atten= 96%, Lag= 67.1 min
Primary = 0.18 cfs @ 13.07 hrs, Volume= 0.219 of
Routing by Star -Ind method, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs / 3
Peak Elev= 602.59' @ 13.07 hrs Surf.Area= 0 sf Storage= 4,796 cf
Plug -Flow detention time= 388.1 min calculated for 0.219 of (100% of inflow)
Center -of -Mass det. time= 388.0 min ( 1,140.1 - 752.1 )
Volume
Invert Avail.Storage Storage Description
#1
598.00' 8,093 cf Custom Stage Data Listed below
Elevation
Cum.Store
(feet)
(cubic -feet)
598.00
0
599.00
584
600.00
1,582
601.00
2,772
602.00
4,046
603.00
5,321
604.00
6,511
605.00
7,509
606.00
8,093
Device Routing Invert Outlet Devices
#1 Primary 596.50' 15.0" Round Culvert L= 10.6' Ke= 0.500
Inlet / Outlet Invert= 596.50' / 596,00' S= 0.0472 '/' Cc= 0.900
n= 0.012, Flow Area= 1.23 sf
#2
Device 1
598.00'
0.100 cfs Constant Flow/Skimmer
#3
Device 1
602.40'
4.0" Vert. Orifice/Grate C= 0.600
#4
Device 1
604.20'
4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
PrimaryOutFlow Max=0.17 cfs @ 13.07 hrs HW=602.59' (Free Discharge)
t1=Culvert (Passes 0.17 cfs of 13.81 cfs potential flow)
2=Constant Flow/Skimmer (Constant Controls 0.10 cfs)
3=Orifice/Grate (Orifice Controls 0.07 cfs @ 1.48 fps)
=Sharp -Crested Rectangular Weir ( Controls 0.00 cfs)

Henn Project Underground Detention Type // 24-hr 2 yr 24 hr Rainfall=3.12"
Prepared by Microsoft Printed 3/29/2017
HydroCAD® 10.00 s/n 05047 © 2013 HydroCAD Software Solutions LLC Page 7
Pond 48P: Pipe Storage
Hydrograph
— Inflow
— Primary
Inflow Area=0.910 ac
Peak Elev=602.59'
Storage=4,796 cf
❑ 5 in 15 9n 95 3n 35 An dS SO 55 so 65 70 75
Time (hours)

Henn Project Underground Detention Type 11 24-hr 10 yr 24 hrRainfall=4.80"
Prepared by Microsoft Printed 3/29/2017
HydroCAD@ 10.00 s/n 05047 @ 2013 HydroCAD Software Solutions LLC Page 8
Summary for Subcatchment 47S: Site
Runoff = 6.28 cfs @ 11.95 hrs, Volume= 0.346 af, Depth= 4.56"
Runoff by SCS TR-20 method, UH=SCS, Weighted. CN, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs
Type II 24-hr 10 yr 24 hr Rainfall=4.80"
Area (ac) CN Description
" 0.910 98
0.910 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
5.0 Direct Entry, Tc
0 5 10 15 20
Subcatchment 47S: Site
Hydrograph
Type II 24-hr
10 yr 24
hr Rainfall=4.80"
Runoff Area=0.910 ac
Runoff Volume=0.346 of
Runoff Depth=4.56"
Tc=5.0 min
CN=98
30 35 40 45 50
rime (hours)
— Runoff

Henn Project Underground Detention Type 11 24-hr 10 yr 24 hr Rainfall=4.80"
Prepared by Microsoft Printed 3/29/2017
HydroCAD® 10.00 s/n 05047 © 2013 HydroCAD Software Solutions LLC Page 9
Summary for Pond 48P: Pipe Storage
Inflow Area = 0.910 ac,100.00% Impervious, Inflow Depth = 4.56" for 10 yr 24 hr event
Inflow = 6.28 cfs @ 11.95 hrs, Volume= 0.346 of
Outflow = 1.09 cfs @ 12.13 hrs, Volume= 0.346 af, Atten= 83%, Lag= 11.0 min
Primary = 1.09 cfs @ 12.13 hrs, Volume= 0.346 of
Routing by Stor-Ind method, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs / 3
Peak Elev= 604.30' @ 12.13 hrs Surf.Area= 0 sf Storage= 6,811 cf
Plug -Flow detention time= 307.0 min calculated for 0.346 of (100% of inflow)
Center -of -Mass det. time= 308.0 min ( 1,051.7 - 743.7 )
Volume Invert Avail.Storage Storage Description
#1 598.00' 8,093 cf Custom Stage Data Listed below
Elevation Cum.Store
(feet) (cubic -feet)
598.00 0
599.00 584
600.00 1,582
601.00 2,772
602.00 4,046
603.00 5,321
604.00 6,511
605.00 7,509
606.00 8,093
Device Routing Invert Outlet Devices
#1 Primary 596.50' 15.0" Round Culvert L= 10.6' Ke= 0.500
Inlet / Outlet Invert= 596.50' / 596.00' S= 0.0472 T Cc= 0.900
n= 0.012, Flow Area= 1.23 sf
#2 Device 1 598.00' 0.100 cfs Constant Flow/Skimmer
#3 Device 1 602.40' 4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1 604.20' 4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=1.04 cfs @ 12.13 hrs HW=604.30' (Free Discharge)
t1=Culvert (Passes 1.04 cfs of 15.82 cfs potential flow)
2=Constant Flow/Skimmer (Constant Controls 0.10 cfs)
3=Orifice/Grate (Orifice Controls 0.55 cfs @ 6.33 fps)
=Sharp -Crested Rectangular Weir (Weir Controls 0.39 cfs @ 1.02 fps)

Henn Project Underground Detention Type 1124-hr 10 yr 24 hr Rainfall=4.80"
Prepared by Microsoft I Printed 3/29/2017
Pond 48P: Pipe Storage
Hydrograph
Inflow Area=0.910 ac
Peak Elev=604.30'
Storage=6,811 cf
Time (hours)
Q.➢
— Inflow
Primary

Henn Project Underground Detention Charlotte 6-hr 50-yr 50 yr 24 hr Rainfall=6.48"
Prepared by Microsoft Printed 3/29/2017
HydroCAD@ 10.00 s/n 05047 © 2013 HydroCAD Software Solutions LLC Page 11
Summary for Subcatchment 47S: Site
Runoff = 9.43 cfs @ 3.10 hrs, Volume= 0.473 af, Depth= 6.24"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs
Charlotte 6-hr 50-yr 50 yr 24 hr Rainfall=6.48"
Area (ac) CN Description
0.910 98
0.910 100.00% Impervious Area
Tc Length Slope Velocity Capacity Description
in) If.+\ Iff/ff\ fff/.c,\ Irfc\
5.0 Direct Entry, Tc
Subcatchment 47S: Site
Hydrograph
— Runoff
Charlotte 6-hr
50-yr
50 yr 24 hr Rainfall=6.48"
Runoff Area=0.910 ac
Runoff Volume=0.473 of
Runoff Depth=6.24"
Tc=5.0 min
CN=98
90 95 3n As An A 5n 55 An AS ]n A Rn AS On QR
Time (hours)

Henn Project Underground Detention Charlotte 6-hr 50-yr 50 yr 24 hr Rainfall=6.48"
Prepared by Microsoft Printed 3/29/2017
HydroCAD® 10.00 s/n 05047 @ 2013 HydroCAD Software Solutions LLC Page 12
Summary for Pond 48P: Pipe Storage
Inflow Area = 0.910 ac,100.00% Impervious, Inflow Depth = 6.24" for 50 yr 24 hr event
Inflow = 9.43 cfs @ 3.10 hrs, Volume= 0.473 of
Outflow = 9.20 cfs @ 3.12 hrs, Volume= 0.475 af, Atten= 2%, Lag= 1.3 min
Primary = 9.20 cfs @ 3.12 hrs, Volume= 0.475 of
Routing by Stor-Ind method, Time Span= 0.00-101.00 hrs, dt= 0.05 hrs / 3
Peak Elev= 604.97' @ 3.12 hrs Surf.Area= 0 sf Storage= 7,479 cf
Plug -Flow detention time= 162.6 min calculated for 0.473 of (100% of inflow)
Center -of -Mass det. time= 165.5 min ( 355.5 - 190.0 )
Volume Invert
Avail.Storage Storage Description
#1 598.00'
8,093 cf Custom Stage Data Listed below
Elevation Cum.Store
(feet) (cubic -feet)
598.00
0
599.00
584
600.00
1,582
601.00
2,772
602.00
4,046
603.00
5,321
604.00
6,511
605.00
7,509
606.00
8,093
Device Routing
Invert
Outlet Devices
#1 Primary
596.50'
15.0" Round Culvert L= 10.6' Ke= 0.500
Inlet / Outlet Invert= 596.50' / 596.00' S= 0.0472 '/' Cc= 0.900
n= 0.012, Flow Area= 1.23 sf
#2 Device 1
598.00'
0.100 cfs Constant Flow/Skimmer
#3 Device 1
602.40'
4.0" Vert. Orifice/Grate C= 0.600
#4 Device 1
604.20'
4.0' long Sharp -Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max=8.66 cfs @ 3.12 hrs HW=604.93' (Free Discharge)
L1=Culvert (Passes 8.66 cfs of 16.51 cfs potential flow)
2=Constant Flow/Skimmer (Constant Controls 0.10 cfs)
3=Orifice/Grate (Orifice Controls 0.65 cfs @ 7.41 fps)
=Sharp -Crested Rectangular Weir (Weir Controls 7.91 cfs @ 2.80 fps)

Henn Project Underground Detention Charlotte 6-hr 50-yr 50 yr 24 hr Rainfall=6.48"
Prepared by Microsoft Printed 3/29/2017
Software Solutions LLC
Pond 48P: Pipe Storage
Hydrograph
1
9.20 ds
9- Inflow Area=0.910 ac
Peak Elev=604.97'
Storage=7,479 cf
6
5
4-
3-
2-
0 L,====:.9
0 5 10 15 20 25 30 35 40 45 50 55 50 55 70 75 8O 95 90 95 100
Time (hours)
— inFlow
Primary

C=::eNTECHO
ENGINEERED SOLUTIONS
Design Engineer:
Date
Site Information
Project Name
Project State
Project Location
Drainage Area, Ad
Impervious Area, Ai
Pervious Area, Ap
% Impervious
Runoff Coefficient, Rv
Water Quality Volume Calculations
Design storm rainfall depth, Rd
Water quality volume, WQV
Storage Component Calculations
Capture 75% of WQV
Pretreatment credit (estimated or calculated), %pre
Mass loading calculations
Mean Annual Rainfall, P
Agency required ,% removal
Percent Runoff Capture (% capture)
Mean Annual Runoff,V,
Event Mean Concentration of Pollutant, EMC
Annual Mass Load, M..,
Filter System
Filtration brand
Cartridge height
Cartridge Quantity Calculation
Mass removed by pretreatment system, Mp.
Mass load to filters after pretreatment, Maassl
Estimate the required filter efficiency, Erilter
Mass to be captured by filters, Miter
Maximum Cartridge Flow rate, Qm,t
Mass load per cartridge, M.,t (Ibs)
Number of Cartridges required, Nmsss
Maximum Treatment Capacity
Determining Number of
Cartridges for Volume -Based
Design in NC
JDP Blue Cells = Input
3127/2017 Black Cells = Calculation
Henn Automotive
North Carolina
Waxhaw
0.91 ac
0.91 ac
0.00
100%
0.95=0.05+0.9'(Ai/Ad)
1.0 in
3138.1 ft3=Ad'Rv'Rd'(43560/12)
2353.6 ft3=0.75-WQV
30%
45 in
85%
90%
127,094 ft'=P"Ad-Rv'(43560/12)'%capture
70.0 mg/I aypiclty so- ResidenliallOfdce,70-Commemiai, mo- mdusman
555.06lbs =EMC'VY(28.3)'(0.000001)'(2.2046)
StormFilter
27 in
167 Ibs
=Mtotal' %removal
389 Ibs
=Mtotal - Mpre
79%
=1+(%removal - 1)/(1 - %pre)
305 Ibs
=Mpassl `Eflter
7.5 gpm
=q' (7.5 ft2/cartridge)
54 Ibs
=lookup mass load per cartridge
6
=ROUNDUP(Mflter/Mcart,O)
0.10
=Nmass`(QcarV449)
SUMMARY
Maximum Treatment Flow Rate, cfs 0.10
Cartridge Flow Rate, gpm 7.5
Number of Cartridges 6
02008 CONTECH Stormwater Solutions
contechstonewater.com 1 of 1

i
NI 4
YARBROUGH-WILLIAMS & HOULE, INC.
Planning • Surveying • Engineering
I 1 1 1
(
REV.
Jan. 19, 2017
PROJECT NAME :
Henn Project
STORM DRAINAGE CALCULATIONS
P. O .BOX 7007
REV.
Mar. 29, 2017
VERSION7.26.13
CHARLOTTE, N.C.28241
REV.
DATE:
Oct. 24, 2016
Phone: [phone]
REV.
Fax: [phone]
OUTPUT FOR SUBMITTAL
PIPE
SURFACE
LATERAL
DRAINAGE
DESIGN
RUNOFF
SECTION
ACCUM,
Tc
RAINFALL
FES/KIN
PIPE
PIPE
AREA
WETTED
DESIGN
FROM
STRUCTURE
TO
COVER
LENGTH
SLOPE
DRAINAGE
PIPES
AREA
FREQUENCY
MANNING'S
COEFF.
FLOW TIME
FLOW TIME
USED
INTENSITY
RUNOFF
O MAX
DIAMETER
DIAMETER
OF
PERIMETER
VELOCITY
STRUCTURE
TYPE
STRUCTURE
ATSTRUCT.
FEET
%
AREA
AREA
TOTAL
10/25150/100
n
C
MINUTES
MINUTES
MINUTES
10,25,60,100
O(CFS)
HW/D: 12
REQUIRED
DESIGNED
FLOW (SF)
FT
FPS
200
MH
200
20.0
117.10
0.60
28.53
28.53
25
0.012
0.95
0.16
10.00
10.00
6.83
185.12
56.33
60
14.91
11.15
12.42
201
DI
202
19.7
137.47
0.60
0.19
6.18
34.90
25
0.012
0.95
0.18
10.16
10.16
6.73
223.27
60.43
66
17.20
11.74
12.98
1
MH
2
7.5
123.37
1.46
4.00
4.00
10
0.012
0.95
0.19
0.01
5.00
7.03
26.71
23.07
24
2.53
4.71
10.57
2
DI
3
2.0
68.00
8.69
0.17
4.17
10
0.012
0.95
0.05
0.20
5.00
7.03
27.85
16.77
24
1.33
2.76
20.92
3
DI
7
2.0
113.30
1.00
0.04
4.21
10
0.012
0.95
0.20
0.25
5.00
7.03
28.12
26.24
30
2.95
4.55
9.52
7
DI
201
2.4
105.80
0.60
0.36
4.57
10
0.012
0.95
0.23
0.45
5.00
7.03
30.52
28.65
30
3.89
5.81
7.84
12
DI
12A
2.0
72.00
0.60
0.31
0.31
10
0.012
0.95
0.29
0.01
6.00
7.03
2.07
10.46
15
0.50
1.69
4.10
12A
DI
201A
2.4
55.70
0.60
0.08
0.39
10
0.012
0.96
0.21
0.30
5.00
7.03
2.60
11.38
15
0.60
1.92
4.36
13
DI
14
1.2
132.88
1.51
0.05 1
0.05
10
0.012 -
0.95
0.69
0.01
5.00
7.03
0.33
4.43
1 15
0.10
0.55
3.20
14
DI
16
1.2
64.64
0.60
0.06
0.11
10
0.012
0.95
0.35
0.70
5.00
7.03
0.73
7.08
15
0.24
0.98
3.06
16
MH
17
2.5
26.01
0.60
0.07
0.18
10
0.012
0.95
0.13
1 1.05
5.00
7.03
1.20
8.52
15
0.35
1.30
3.40
17
DI
18
2.5
46.47
0.60
0.14
0.32
10
0.012
0.95
0.19
1.18
5.00
7.03
1 2.14
10.57
15
0.52
1.73
4.11
18
MH
2O1B
3.0
60.03
0.60
0.09
0.41
10
0.012
0.95
0.23
1.37
5.00
7.03
2.74
11.60
15
0.63
2.00
4.35
21
DI
16
10.5
50.66
1.18
0.07
0.07
10
0.012
0.95
0.25
0.01
5.00
7.03
0.47
5.26
15
0.14
0.67
3.38

P. O .BOX 692
MATTHEWS, N.C.28106
Phone: [phone]
Fax: [phone]
YARRRn1Tr-u-WTT T TAMx HnTTT P TT r
I -----_Planning Surveying • Engineering ----
PROJECT:
Henn Project
DATE:
SKIMMER BASIN
DESIGN - STATE
STD. DETAIL 06.64
REQUIRED
SURFACE AREA
REQUIRED
STORAGE
SKIMMER
SKIMMER
theoritical
SED. BASIN
DRAINAGE
DENUDED
010
SURFACE AREA
PROVIDED
STORAGE
VOLUME(CF)
TOP (Min.) BOTTOM (Min.)
DEPTH (FT)
PIPE
ORIFICE
HEAD AT
SPILLWAY
HEAD (FT)
TOP OF
SKIMMER
spillway
NO
AREA (AC.)
AREA (AC.)
(cla)
(s1)
W)
VOL.(CF)
PROVIDED
W(R)X L(N) W(R)X L(N)
(H)
DI&(IN)
DIA.(IN)
ORIFICE (FT)
Z(FT)
WIDTH (L)(FT)
T(FTI
IN(FT)
AT SPILLWAY
DAM ELEV.
capacity
Width
CiS
n
1
5.72
200
SW2796.53
MUM
3,612
6,201
41 � X 0
25 X 52
4
1.5
1.50
0.13
5.1
16
1.0
5.0
0.5
610
0 024
16

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Q IN
f
V IV ( r • / / SHED TITLE
WATERSHED EXHIBIT i'=200'
`:" l ` �` - - \ �!�\ HENN STORAGE FAW2
9 t;
v- CILITY
�\ I,/ �\ ���/ 'J-- _ TOWN OF WAXHAW, UNION CO., N.C. VGK
_ � �//r�--��vL� � _ _ -- � _ r— FOR: HENN AUTOMOTIVE, LLC
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\ \ .' \ \\ \ .. _ / - / \ - .." , i _ - - II I — \ 1 ec mw• �,� er'..."..T.� �n 0 0 1 OF 1

Patterson, Robert D
From: Vince Keene <[e-mail]>
Sent: Wednesday, April 19, 2017 8:48 AM
To: Patterson, Robert D
Cc: Marc Houle
Subject: RE: SW3170402 - Henn Storage Facility - Additional Information Request
Robert,
Regarding the subject project, the Henn's are on vacation this week. I will secure the documents you need upon their
return. Just a heads up.
Thanks,
Vincent G. Keene, P.E.
Yarbrough -Williams & Houle, Inc.
730 Windsor Oak Court (28273)
Charlotte, North Carolina
Mail to:
P.O. Box 1198
Pineville, NC (28134)
Phone [phone]
Fax [phone]
[e-mail]
From: Patterson, Robert D [mailto:[e-mail])
Sent: Monday, April 17, 2017 10:42 AM
To: Vince Keene <[e-mail]>
Subject: FW: SW3170402 - Henn Storage Facility - Additional Information Request
Sending again with your correct email
From: Patterson, Robert D
Sent: Monday, April 17, 2017 10:41 AM
To:'[e-mail]' <[e-mail]>
Cc:'[e-mail]' <[e-mail]>
Subject: SW3170402 - Henn Storage Facility - Additional Information Request
Vince,
Just wanted to follow up after out phone conversation this morning. Both the applications (SWU-101) and the 0&M
Agreement need to be signed by Susan Henn; as Michael is not listed by the Secretary of State as an Officer of the
LLC. Alternatively, you could submit an original signed letter from Mrs. Henn giving Michael signature authority for the
application and O&M agreement.
This additional information must be submitted by May 17, 2017, or the application will be returned as
incomplete. Please let me know if you have any questions.
Thanks.

Robert D. Patterson, P.E.
Stormwater Engineer
NCDEQ I DEMLR I Stormwater Permitting Program
919-807-6369 1 Robert. [e-mail]
512 N. Salisbury St. I Raleigh, NC 27604
1612 MSC I Raleigh, NC 27699-1612
http://portal.ncdenr.org/web/ir/stormwater
Email correspondence to and from this address is subject to the North Carolina Public Records Low and maybe disclosed to third parties.

Corporations Division
Page 1 of 1
Click Here To:
North Carolina
Elaine F. Marsha!! DEPARTMENT oFTIHE
Secretary SECRETARY OF STATE
PABox29822 Raleigr NC27626.0622 [phone] Account
Login
Create
View Document Filings File an Annual Report Amend a Previous Annual Report Account
Print a Pre -Populated Annual Report form
Corporate Names
Legal: HENN AUTOMOTIVE LLC
Limited Liability Company Information
Sosld:
0453022
Status:
Current -Active
Annual Report Status:
Current
Citizenship:
Domestic
Date Formed:
3/12/1998
Fiscal Month:
December
Registered Agent:
Henn, Michael R
Corporate Addresses
Reg Office:
1152 N Broom
Street
Waxhaw, NC
28173-9378
Reg Mailing:
1152 N Broom
Street
Waxhaw, NC
28173-9378
Mailing:
5970 Fairview
Road
Charlotte, NC
28210-3167
Principal Office:
5970 Fairview
Road
Charlotte, NC
28210-3167
Company Officials
All LLCs are managed by their managers pursuant to N.C.G.S. 57D-3-20.
Manager: ,Susan S Henn
1152 N Broom Street
Waxhaw NC 28173
http://www.sosnc.gov/Search/profcorp/4691854 3/30/2017

SK1084FG0107
9
*I
UNION CUM aC
04/20He
$400.00
n•Ogy .70
Real Estate
=LIMA Pub
Elelea Tax
Filed lot (Wald `i -�, D -
0ale l C1
jIIR¢ Slef 01 �iie.
jjV kKWcaty ce ryOy CafO(m9
Excise Tax S40000 I Recording Time. Book and Page
Tax Lot No. 06-14I4146 Parcel Identifier Nn.
Verified by County on the day of 19,
by
Mail after recording to Kenneth J. Abnv. Robinson, Bradshaw & I limmn. P.A. 101 N. Tryon St., Suite 1900, Charlotte N.C. 28246
This Instrument was prepared by Kenneth 1. Abnco Robinson, Bradshaw & Hinson. P.A.
Briefdescription forthe Index ,/-i.652 apes, Washaw. Nanh ('arnliw
Union County Tax dnG-IJLOJ6
NORTH CAROLINA GENERAL WARRANTY DEED
THIS DEED made this lath day of April ,19 98 ,by and but..
GRANTOR
CHARLES E. CHARTER and wife,
DOLORES P. CHARTER
,_
VCRs
Enter tua ra near,
pp pr6te black for each party: home, add.ns. aad. if apt
GRANTEE
I [CNN AUTOMOTIVE: LLC, a North Carolina
limited liability company
11607 Five Cedars Road
Charlotte, North Carolina 28226
ropriate, character of entity, e.q. corporation or pannenhip.
The designation Grantor and Gnntee as used herein shall include said parties, their heirs, wuesson. and assigns, and shall include
singular, plural, masculine, feminine or neuter as required by context.
WITNESSETH. that the Grantor, for a valuable consideration paid by the Grantee. the receipt of which is hereby acknowledged, has
and by these presents does grans, bargain• sell and convey unto the Grantee in ftt simple, all that ttnain lot or parcel of land situated
in the Town of Waxhaw, Union County, North Carolina and more particularly described as follows:
See Exhibit A attached hereto and made a part hereof,

BKI084PGO108
The property hereinabme deaen'bed was acquired by Grantor by instrument recorded in Book 425, Page 578 Unisys, County Registry.
A map showing the above deuribed ProPerly is tecotded in Plat Book page .
TO HAVE AND TO HOLD the aforesaid la or Pastel of land and all privileges and appurtenances thereat belonging m the Grvrleee
in fee simple.
And the Grantor <ovmmb with the Grantee, that Grantor is uimd of the premism in fee simple, has the right to convey the same in
fee simple, that title is marketable and free and clear of all mmmbrmccs, and that Grantor will warrant and defend the tide agam.
the lawful claims of all Persons whomsoever except for the exaptiorrs hereinafter stated.
Titic to the prapeny hereinabove described is subject ro the following exceptions:
I. The lien ofad valorem raves for 1998 and subsequent yean,
2_ All valid consistently. condhiuns and restrictions of retard.
IN WORESS W IIF.REOF. Ne Ginn or ass sertamo sm bis hand mJ xH. or If coaoma, ha caaN Nk inan.nml b b n� b b wrparYe nvea by trr dWy
aulMnixd 9mcm it by xHahhwcuna amaca by mnMrhy of is Ircod o(Oirtcass, do, dayday snoZE
swI om.
(Cwpmbr Name) � i
- 8y: o�a CHA�7C AR ,R n�U
Pnsids t b Spa rm y Q .� �`" HEAL)
ATTEST: wLORES P. CHARTER
a
01 aFwL)
SecxIa0 lCorpsa, ett r�is
ISFau
NORTH CAROL(NA, Mttkknbwe Coumy.
'•1:1• ': rt = g 1. a Nousy Pyle of de Caomy na $lyr afpoaia. wi% Ibb CHARLES E CHARTER wd rife. DOIgRES 1.
CHARTER. Gradm, Wnmwllr apKord bekrt me this dry and rs"ow4dae da vmdion of dw fwe�ing
imaivnem WiammybanaaNnmfialslmnpoexal.
the 20 dryof AM]
.19 91
.+us,. -STAMP NORUICAROLINA,
C.Y.
I. a Navy Pubuc of Ne Cmmry anJ.Sue afweuiq Beni%dad
g perrmally suns Nbo s me Nis der aM ykno W,d No be u -
'son w, m
g a NorthCaclbw mrpo,wor. and Na by Wtb, ydoly
given mW to
co vI of ar m9nrvion, da G`geiog immaanl was signed in is none by in
ProWaL xs,d-bb as ewpwoe xaiatl artraJ by _sin
Witness my hmW na omeial uon ��p or xnl, Nis daS n( ,19
M)comnfvyion capim: .. -
The foregoing Cmiflcbuditf of
IvWcenified to be i!tx R This instrument and this crnificate arc duly registered at the date and time and in the Back and Page shown an
the first page hcrmf.
,PW Q. ppicEREGISTER OF DEEDS FOR
By V COUNTY
DgaylAasisNnt-Register of Deeds
casaiun.msrowa

0
QIt 1081000109
EXHIBIT A
Lying and being in the Town of Waxhaw, Jacksonville Township, Union County,
North Carolina, and being more particularly described as follows:
BEGINNING at a point located in the center line of the right-of-way of N.C.
Highway N 16, which point is located S. 30-39 E. 389.70 feet from the intersection of the
center line of N.C. Highway 916 and the center line of Providence Farms Road; thence,
leaving the center line of N.C. Highway 916, N. 73.52-44 E. 31.55 feet to an iron pin on
the eastern margin of the right-of-way of N.C. Highway N 16, a comer of the property of
E.P. Nisbet Company (now or formerly) as described in Book 458, Page 256 in the Union
County Public Registry (hereinafter the "Registry"); thence, with and along the boundary
line of the property of E.P. Nisbet Company, N. 73-52.44 E. 522.22 feet to a pipe, a
common comer of the property of E.P. Nisbet Company and Lot 25 of Providence Farms
as shown on that subdivision map recorded in Plat Book B, Page 55A in the Registry;
thence, with and along the boundary line of Lot 25 of Providence Farms Subdivision, S.
82-02.30 E. 332.45 feet to a pipe, a common comer of Lot 25 and Lot 23 of Providence
Farms Subdivision shown on the above -referenced map, said pipe also being a comer of
the property of R.B. Howie (now or fornerly) as described in Book 668, Page 463 in the
Registry; thence, with and along the boundary line of the property of R.B. Howie, S. 61-
43 00 W. 745.50 ieet to a pin located on the eastern margin of the right -of --way of N.C.
Highway 916; thence S. 61-43-00 W. 30.18 feet to a point in the center line of N.C.
Highway H 16; thence, with and along the center line of N.C. Highway # 16, the following
two (2) courses and distances: (1) N. 34-35-12 W. 101.87 feet to a point; and (2) N. 34-
22-I6 W. 213.13 feet to a point, the point and place of BEGINNING, containing 3.652
acres, more or less, 0.215 acres, more or less, within the right-of-way of N.C. Highway
#16, as shown on a Boundary Survey prepared by Gordon D. Svedberg, N.C.R.L.S.,
dated March 25, 1998.
came,wuumru

TO
4:.%`
YARBROUGH-WILLIAMS & HOULE, INC.
P.O. Box 1198 Pineville, NC 28134
[phone]
Fax[phone]
//Vto O I/r
WE ARE SENDING YOU C'Attached ❑ Unden_
❑ Shop drawings ❑ Prints
❑ Copy of letter ❑ Change order
LIEVIV[212 @I F 4�o MMVVZUL
DATE
JOB NO.
ATTENTION /
e�h
ff
RE:if
B
9,ap S
cov@r via ��'"� the following items:
r
'Q PlaT n, < Samples 1-1Specifications
THESE ARE TRANSMITTED as checked below:
Lz­ror approval
❑ For your use
❑ As quested
For review and comment
❑ FOR BIDS DUE
REMARKS
❑ Approved as submitted
❑ Approved as noted
❑ Returned for corrections
Fl
❑ Resubmit copies for approval
❑ Submit copies for distribution
❑ Return corrected prints
❑ PRINTS RETURNED AFTER LOAN TO US
COPY TO
SIGNED:1
If enclosures are not as noted, kindly notify

ILIETffM L3 OO IF WM A3MOTTMIL
YARBROUGH-WILLIAMS & HOULE, INC.
P.O. Box 1198 Pineville, NC 28134
[phone]
TO
qI (?- 4907-�36�I
WE ARE SENDING YOU l-<ached ❑ Under separate cover via _
❑ Shop drawings ❑ Prints ❑ Plans
❑ Copy of letter ❑ Change order ❑
DATE
JOB NO.
ATTENTION
RE:
r
❑ Samples
the following items:
❑ Specifications
COPIES
DATE
NO.
DESCRIPTION
LG c, C /vl
�. sL
THESE ARE TRANS ED as checked below:
For approval
❑ For your use
❑ As requested
❑ For review and comment
❑ FORBIDS DUE
REMARKS
❑ Approved as submitted
❑ Approved as noted
❑ Returned for corrections
❑ Resubmit copies for approval
❑ Submit copies for distribution
❑ Return corrected prints
❑ PRINTS RETURNED AFTER LOAN TO US
t
COPY TO
SIGNED: f
If enclosures are not as noted, kindly notify us

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