20210416_Sediment_calculations

Calculations and Reference Material
For
Ararat Rock Quarry
Mount Airy, NC
Prepared by:
Bowman -Bunn, P.C.
152 N. Main Street
Mount Airy, NC 27030
December 2020
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Hydrocad Modeling
2yr, IOyr, 100yr

Mt Airy Quarry_skimmarbasins
Prepared by Microsoft - Primed 122312020
MdmCA0®10.0O21 sin 10247 02018 HydmCAD Sobrme Sokd= LLC Paso 2
Area CN Dewipbon
(su) (subcmclmentnumbem)
28.440 78 (dal, da4, da5, dab)
2BA40 78 TOTAL AREA
da-6
da-1 da 4 da-5 Drainage a#e
Drainage a#1
Drainage #4 DrainageA a#5
re
6P
9P 5P
A,, skimmer#6
skimmer basin #1 skimmen45
tam skimmer#4
Subcal Re9ch� on iLink
i—
Ares Listing (all nodes(

Mt Airy Quarry_skimmeibasins
Prepared by MlcrosoR Printed 12/23I2020
HWMCAO®1a00.21 Sin 10247 0 2018 l+AmCAO Software Sokdim LLc p= 3
Soll UsUng (all nodes)
Area
Soil Snbcab Irnent
(acres)
Group Nurnberg
0.000
HSGA
0.000
HSG B
0.000
HSG C
0.000
HSG O
28.440
Other dal, dad, day, da-6
2BA40
TOTAL AREA
Mt Airy Quarry_skimmerbasins
Prepared by Mkmsoft Pdrrted 12/23/2020
h MCAN 10.00.21 s/n 10247 0 2018 Ridv M Sofmm Sokdm LLC pM 4
Ground covers (all nodes)
HSGA
HSG$
HSG-C
HSGO Other
Total
Ground Subcftment
(saes)
(saes)
(acres)
(saes) (acres)
(acres)
Cover Numbers
0.000
0.000
0.000
O.000 28.440
28.440
dal, dad, day, da-6
0.000
0.000
0.000
0.000 2BA40
28.440
TOTAL
AREA

MI Airy
NOAA 24-hrC 2-year Rainfa1p3.48'
Printed 12=020
Time span=0.00-90.00 hrs, tl1-0.05 W. 1801 points
Runoff by SCS TR-20 method. UH=SCS, Weighted-CN
Reach muting by Stsrdnd-Trans method - Pond musing by Slor-Ind method
Subcadurnenl dal: Drainage Arm el
RumlfArea=7.800ac 0.00%knMvbW RmmffDepth=1.48'
Tc10.0mh CW-78 Runo8=12.71ds 0.963a1
Subcatchmerd da4: Drainage Am $4
RmmfiArr�7.500ac 0.00%knpervbus Rum8Dep11F1.4W
TcfO.Omh CW78 Rurwff=1222ds 0.926ai
Subcstchmmtda5:Dralnage Am #5
Rurmff Arer-8.720ac O.Mlimpervhus RurmADepth=1.48'
ToIbOmh CN-78 RuW"4.21ds 1.077af
Subcelchmenl dab: Drainage Area 66
Rurofflue=4.420ac O.DD%Impervbus RunoADepth=1.48'
Tc10.Omin CN-78 Rurmff=7.20ds 0.546af
Pond lP: skimmer beads 91
Peak Ebr-1,008.11' Smmge=0.521 of ineoe=127lcts 0.963 at
Prkna0-0,06 ds 0.391 of SEmvtlmr1,70 ds 0.397 of Ouelmr-1.76ds 0.788af
Pond 4P: hem skimmer 04
Peak Ekv-1,001.10 Smrage=0.503 of Inibr-1222ds 0.926 a1
Prknay-0A6 ds 0.391 of Se0014ay_1,61 cis 0.377 a1 Ou0M=1.67ds 0.768at
Pond 5P: sklmmerr5
Poak Ekr-978.17 Slomge=0.570a1 Inlbw•14.11 cis 1.077 at
Prknary=0.07 cm 0.431 a1 Secondary-208 cis 0A60 at QMba=1.15ds 0.891d
Pond 6P: sklmmmr6
PmkEav--M.05 ftW=D..344d In6pr-7.20cfs 0.546at
Prknary=0.03 ds 0.193 al Semndmk-0.51 cis 0.178 at OuMow0.54 ds 0.371 M
Total Runoff Arm-26.410ac Runoff Volume =3.513 a1 Average Runoff Depth -1.48-
100.00%Pervious=28.440 ao 0A0%lmpervlous=O.000sc
Mt Airy quarry_skimmerbasins NOAA 24-hrC 2-yea,Reinfa7k348-
Prepared by Microsoft Pdnted 12P1312020
HydmCAD®10.00.21 s7n 10247 02018 HydmCAD Bonware Solutions LLC P
Summary for Subcatchment da-l: Drainage Area 11
Runoff = 12.71cfs@ 12.18hrs, Vokam,- 0.963 at Depth= 1.48-
Runoff by SCS TR-20 method, UH=SCS, WeighhvFCN, Time Span=O.WDg0A0 hrs, dl- 0.05 as
NOAA24-MC 2-Ymr Rabdall=3.4r
Area ix) CN Oescription
7.800 78
7AW 1tD.00%Pervious Area
To
10.0
Description
Subcatchmeld da-i: Drainage Area N7
NOAA 24-hr C
2-Year Rainfall=3.48"
Runoff Area=7.800 ac
Runoff Volume=0.963 of
Runoff Depth=1.48"
Tc=10.0 min
CN=78
o s to rs 20 35 W 35 a0.__45 so 55 ad 6.5 M 7s ea is N

r e
Mt Airy Quany_skimmerbasins NOAA 24-NC 2-Year Rainfelk2.48'
Prepared by Mcrosoft printed 12MM020
HHYdmCADO 1000-21 ldh 1024702018 hW,,M Softan,Solution, LLC P.7
Summary for Subcatchment dad: Drainage Area #4
Runoff = 1222cfs@ 12.18hrs, Vdume= 0.926af, Depth= 1A8'
Runoff by SCS TR-20 method, UH=SCS, WeighledCN, Terse Span=0.00.90A0 hrs. dt= 0.05 has
NOAA 24-hrC 2-Year RainWk3.48'
7,500 100.0D%Pervbus Area
To Length Slope Velocity Capacity Description
(min) (feet) (MO (elsec) (d(s)
10.0 Direct Entry,
Subcatchment dad: Drainage Area #4
t2 NOAA 24-hr C
11 2-Year Rainfall=3.48"
10 Runoff Area=7.500 ac
_ a Runoff Volume=0.926 of
6 Runoff Depth=1.48"
Tc=10.0 min
S CN=78
2
nme pieun)
e0
®Runoff
Mt Airy Quarry_skinnmerbasins NOAA 244WC 2-YwRainlalk3.48'
Prepared by Microsoft Printed 12fC MO
thdmCADO 10.D021 sin 1024702018 t1nlO Software Solulbne LLC p 8
Summary for Subcatchment da-5: Drainage Area 95
Runoff = 14.21 cfs® 12.18 hrs, Volumes 1.077 at Depth= 1.48'
Runoff by SCS TR-20 medmd, UH=SCS, WeightedCN, Tens Spar=0.00.90.00 has. & 0.051us
NOAA24hrC 2-YearRainfal- 8'
8.720
To LOA* Slope Velocity Capacity Description
(min) (feet) (NM (Nsec) (cls)
10.0 Ca ect Enby,
Subcatchment da-5: Drainage Area #5
14 NOAA 24-hr C
12 2-Year Rainfall=3.48"
11 Runoff Area=8.720 ac
In Runoff Volume=1.077 of
= a. Runoff Depth=1.48"
7 Tc=10.0 min
6 CN=78
a
0
W W ea 70 75
■Runatt

1
Mt Airy Quarry_skimmerbasins NOAA 24-hrC 2-YWRamfa1k3.48'
Prepared by Microsoft Printed 1223@020
ROMCAD@10A0.21 SIR10247@2D18HsdmCADSoRase SoluUons LLC Paw
Summary for Subcatchment da-6: Drainage Area #6
Runoff 7.20 cis@ 12.18 his Volume= 0.546af, Depth= 1.48'
Runoff by SCS TR.20 method, UH=SCS, WeghledCN, Time Span=0.00-90.00 his, dF 0.05 hrs
NOAA 24-hrC Meer Rainfalk3.48'
4.420 78
4.420 10D.00%PeM us Area
Tc Len" Slope Velocity Capacity Description
(min) (feel) (81fi) (Nsec) (cN)
10.0 Direct Entry,
Subcatchment d": Drainage Area #6
t
mme
NOAA 24-hr C
2-Year Rainfall=3.48"
Runoff Area=4.420 ac
Runoff Volume=0.546 of
Runoff Depth=1.48"
Tc=10.0 min
CN=78
55 e0 65 70 75
14 ewon
Mt Airy
Summary for Pond 113: skimmer basin #1
NOAA 24-hrC 2-YearRamfefk3.48'
Printed 12/2312020
InflowArea= 7.800ac, 0.M.Impervious, Inflow Depth= 1.48' for 2-Yearevent
Inflow = 12.71 cls @ 12.18 has, Volume= 0.963 of
Oudlow = 1.76 cte@ 13.04 hers, Volume= 0.788 at Allen=06%, Lag-51.9 min
Printery = 006 cis@ 11.75 his, Volume= 0.391 of
Secondary 1.70cis @ 13.04 his, Volume= 0.397 a1
Routing by Slor-Ind method, Tune Span= 0.00-90,00 hrs, or- 0,05 his
Peak Ela--1,008,11' @ 13.04has SurfMa= 0.194 ac Storage= 0S21 al
Plug -Flow detention bm = 1,227.8 min calculated for 0.707 of (82%of inmw)
Cenkr-o4Mass del, tires 1.150.3 min ( 2,002.1-851.8 )
Volume, Invert AvaOSkxage Storm Description
#1 11005.00 0,922 a1 54.005Vx 115.001 x 5.WH Prismatold 2=2.0
N1 Primary 1,005.00' O.D60cda Contain Fluaradmma Phase-In=0.33'
#2 Secondary 1,008.00' 15.0'Imgx1.00'dse8h&MZMdWRectangularWelr 2 End Contractlun(s) 1.0rCreslHeiOhl
!Amory Outnow Max=0.06 ds@11.75 his HW=1,DD5.37' (Free(ischage)
rnstam FlowlSkhnmm (Constant Controls 0.06 cfs)
tndarytfl Ouow Max=t.69cls@13.04hm HW=1,008.11' (Free Discharge)
SharpCrested RectangularweIr (Weir Controls 1.69 cfs @ 1.07 fps)
Pond 1P: skimmer basin #1
I
®innow
n a,mbw
,4. Inflow Area=7.800ac _■P^row
s<�.w
Peak Elev=1,008.11'
12
11 Storage=0.521 of
fi e
e
a
s
2
1
0
0 5 10

It
NOAA 24-hrC 2-Year Rainfal0348'
Printed 127232020
Mt Airy Quarry skimmerbasine NOAA 24-hr C 2-Year Rainfa&3.48'
Prepared by Microsoft Printed 12/232020
HOMCADS IO S21 sin 10247 412018 HwdroW 9otware6olmbrm 11C Page 1
Summary for Pond 41): tem skimmer #4
Summary for Pond 513: skimmer85
ImflDWArea= 7.500ag, 0.00%Impervbus, InBowDeptb= 1.48' for 2-Yearevent
Inflow Area= 8,720 ac, 0.00%impervious, Inflow Depth= 1.48' for 2-Year event
Inflow = 12.22 cis@ 1218 hrs, Volume= 0.926 of
Inflow = 14.21cli 12.18hm,Volume 1.077 at
Outflow = 1.67cfs@ 13.OBhm, Volume 0.760at Atlen=8656. La¢52.6m1n
Outlbw = 2.15cfs@ 12.98hm, Volume= 0.891 of, AtIon=85%, Lag=46.8 min
Primary - 0.06ols@ 11.75hm, Volume 0,391 of
Primary = 0.07cfs@ 12.15hrs, Volume= 0,431 of
Secondary 1.61 cls@ 13.06 lure, Volume 0.377 of
Secondary= ZOB cis@ IZ96 an, Volume= 0.460 of
Routing by Skx-Ind metod, Tire Span=0.DD 9D..00 ms, d1=0.05 hm
Routing b7 Smr-Ind method, Time Span-0.00-90.00 hrs, dt- 0.05 M
Peak Elev=1,001.10@13.06 hrs SurI*w=DI88ac Stomge=0.503af
Peak Elev=978.17@12.96ms SWAN -0.211ac Stage=0.570af
PlugFbxdaten8on tme 1.251.4 min cakulaUd forO.767 al (83%olinfiow)
Plug-FlowdeUntlon time=1,161.1 min calculated for 0.891 al(83%of inflow)
Center-oM m oat time 1,177.1 min (2,028.9 - 851.8)
Cealer-0l-Mass dot fime 1.084.7 min (1,936.5-851.8 )
Vohmre Invert AvauStraae Storage Description
#1 990.00 1.12681 5200'W x 115.00'L x 6.00'H Pdsmotold Z20
Device Ragtag Imarl Outlet Devices
91 Pmwry 990.00 0.060cfs ConSUnl FIovI Mmmer Pham4n=0.30
92 Secondary 1,001.00 160long x 1.00 rise SharpCrested Rectangularki 2End Contrac0on(s) 1.0Crest Height
Zy OutFlow Max=0.06 cis @ 11.75 me HW=998.36 (Free Discharge)
onstant HoviSkimmer (Constant Conbds0.O8c(s)
J!ondaryOutFlow Max=156cfs@13.061rs HW=1,001.10 (Free Discharge)
2--SharpCrested Rectangular Weir (WeirCootr* 1.56c1s @ 1.051ps)
Pond 4P: tern skimmer #4
m,=
annw
Inflow Area=7.500 ac
Sooe,y
Peak EIev=1,001.10'
Storage=0.503 of
Volume ImM AvalStpraoe Slomoe Descrioeon
#1 975.00 1.002 al 53.00'W x 128.DO'Lx SAOH Pdsmatold Z20
Device Roulkm Inverl Outlet Devices
#1 Prunary 976A0 0.07DC(SConsUm FIMISFimmer Phase-In=0.33
#2 Secondary 978.00 15.alongxl.Wrfse9hary-Crested Reclangulawdr 2End ContN"s) 1.0-Cmit Height
PdmeryOutFlow Max=0.07cfs@1215hrs HW=976.43 (Free Discharge)
t-lxonsUm FloaMica mer (Conslant Conbols 0.07 ds)
?TdaryOutFlax Mal=2.D4 cfa @ 12.96 hrs HW-978.17 (Free Discharge)
2--SharpCrested RectangularWelr (Weir Canb 1s 2.04 cfs @ 1.14 fps)
Pond 513: sklmmer#5
■Inflow
InflowArea=8.720ac
a"
■aemnovy
Peak EIev=978.12'
Storage=0.570 of
40 45 W 55 M 65 70 75 M 85 90
Tlme 1.1

Mt Airy Quarly_skimmerbamns NOAA 24-hrC 2-Year Rainfelt3.48'
Prepared by Microsoft Printed 11/23=0
HydmCAD®10o021 ShI10247 020l8HYd*CADS*wweSAdm,LLC
Summary for Pond 6P: skimmer#6
InBowArea=
4.420 ac, 0.00%Impervbus, InllowDepth= 1A8- fog-Yearevant
Inflow =
7.20 cis@ 12.18hm, Volume= 0.646 of
Wow =
0.54 cis@ 13.76hm. Voka 0.371 at, Allen=93%, Lag=94.6 min
Prkneny =
0.03 cis 12.20hn, Vol,,, 0.193of
Secondary
0.51 ck@ 13.76 hrs, Vakuna= 0.178 at
RouBng by Ster-Ind method, Tine Span= 0.00.90.00 hm, dr- 0.05 has
Peak Ekm--980.09®13.76hrs Sud.Nee=o.135ac Stomps=0.344af
Plug -Flow detention Bme=1,347.1 min calculated for0.371 of (68%dnflow)
Canter44-Mass dot time- 1,240.7 min (2,092.5- 851.8)
Volume Invert Ava78b7raoe Storage Desaiok,
#1 977.00 0636 of 41.00W x98.00L x 5.o0'H Prismatold Z-2.0
#1 pmgsry
#2 Secondary
15.O'iongx IAO du ShapCresled Rectangular Weir 2 End Contrac8on(s) 1.0CreslHeight
ZmarY WNW MW403 cis @ 12.20 in HW=978.48' (Free Discharge)
ondant Flow7Skimmer (Consult Con" 0,03 cis)
Secondary Oufloww Ma:=0.49 cis @13.76 hrs HW-W.0Y (Free Disdrerge)
L2-SharyCrested Rectangular Weir (Welt Console 0.49 ds Q 0.70 fps)
Pond 613: skimmer#6
■Nlbx
Inflow Area=4.420 ac
kaj
Peak Elev=980.05'
Storage=0.344 of
In. rheum
NOAA244aC 10-YearReinte#418'
Rimed 12723M
Time span=.00.90.00 hrs, dK.05 hm, 18D1 points
Runoff bySCS TR-20 method, UH-SCS, Weighled-CN
Reach mu8ng by Stnr-IM.Trans method - Pond mu ding by Stor-Indmethod
Subcatchment dad: Drainage AM #1
Subcatchmenl dad: Drainage Area #4
Subcatchmem da-5: Drainage Area #5
Subcalchmem dart: Drainage Area #6
Pond 1P: skimmer basin 91
Pond 4P. rem skimmer44
Pond 5P: skimmer#5
Pond 6P: sklmme #6
Ruro#Ama7.800ac 0.00%ImperviDa RuroODW,2.8r
To=laOoot CN=78 Runor=24.67ds 1.862of
Runoff AMs7.500ac 0.00%Impennous Runoff Depth=28r
To10.1)min CN--78 ROW11-23.72ds 1.791af
Runo6Am &720ac 0.00%knpervkus RumRDaph=267-
To10.Oren CW78 Runoff=27.58cfs 2.082af
Rum#AM4.420ac aOD%Mpwvjom Rum#Deph=28r
Tc10.0mn CN-78 Rundb13.98ds 1.055af
Peak Ekw-1,008.53 8be9e--0.605 of In9o-r-24.67 ck 1.862 of
PPoanllko6cle 0.397a Seconmay=1986ch IM901 Outflow-19.92ds 1.686d
Peak Eler-1,001.51'Sbnga--0.593 of Inflow-23.72 cfs 1.791at
Pralum( .O6of$0.397a Secondary-19.12 ds 1.234 of OulOow--I9.18 cis 1.631 of
Peak Elev=978.5r Skwp =0.668 of Inflow--27.58 cis 2,082 of
Pdnary=0.07ck 0.434af Secondary-2247ch 1.462af Oumbw=22.54de 1.896af
Peak Ekr-980.33- Stomp-0.382 d kulow-13.98 ds 1.055 of
Phna)=0.03 cfs 0.194 al Secondary-9.67 ck 0.686 of Oullnw=9.70cfs goal of
Total Runoff Area =28.440 arc Runoff Volume=6.790 of Average Runoff Depth - 2.87-
100.00%Pervkms=2&440ac 0.00%Impervious=D.00oac

r
Mt Airy
NOAA24-hrC 10-YeerReinfel1=548'
Printed 1212312020
Summary for Subcatchmem da-1: Drainage Area M1
Runoff = 24.67 cls @ 12.18 hrs, Volume= 1.862 at Depth= 2.8r
Runoff bySCS TR.20 method, UH=SCS, Weighted-CN, Tine Span= 0.00-9000 hrs, dr- 0.05 hrs
NOA424-hrC 10.Year Rainhl1=5.18'
Area(ac) CN Desoipbon
7.800 78
7.800 100.00%Pervious Area
Tc Length Slope Velocity Capacity Description
_ (min) ((eel) (it18) (Posec) (Cis)
10.0 Direct Entry,
Subcatchment da-1: Drainage Area #1
Mt Airy Quarry_skimmerbasins NOAA 24-hrC 10-YearReinfelk5.18'
Prepared by Microsoft Printed 12123/2020
MdmCAO®10.00.21s1n 10247©201e HydmCADSmIwae SobAwsLLC Pow 16
Summary for Subeatchmern dad: Drainage Area 91
Runoff = 23.72cfs@ 12.18hm, Volume= 1,791 af, Depth= 287'
Runoff by SCS TR-20 mothod, UH=SCS, Weighted-CN. Tire Span= 0.00-90.00 hrs, dt- 0.05 Mrs
NOAA24-hrC 10-Year Rainfak5.18'
Area(ac) CN Dev*Uon
7.500 78
7.500 100.00%Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feel) (Poh) Mae) (CIS)
10.0 Direct Entry,
Subcatchment dad: Drainage Area P4
2s
Nwa
nRwwn 26
2l.Tleh
24
NOAA 24-hr C
24
NOAA 24-hr C
22
10-Year Rainfall=5.18"
o
10-Year Rainfall=5.18"
20
Runoff Area=7.800 ac
Runoff Area=7.500 ac
t0
Runoff Volume=1.862 of
a
16
Runoff Volume=1.791 of
16
14
Runoff Depth=2.87"
9 14
Runoff Depth=2.87"
C 12
Tc=10.0 min
12
Tc=10.0 min
10
CN=78
10
CN=78
e
e
6
6
° s 10 1's m n air ss m as ) u m Be ro 75 eo
me mInour.
Time Iawml

Mt Airy
NOAA24-hrC 10-YearRalnlelk5.18'
Holed 12Q3120P0
Summary for Subcatchment da•5: Drainage Area #5
Runoff = 27.58cfs® 12.181nrs, Volumr- 2.082 at Depth= 2.67'
Runoff by SCS TR-20 method, UH=SCS, WeighWCN, Time Span= 0.00-90.00 firs, tlt- 0.05 hrs
NOA424-hrC 10-Year Rainfall=5.10'
8,720 100.00%Pmbus Area
To Length Slope Velocity Capadty Description
(min) (feet) (NRl (Nsec) (cis)
10.0 Direct Entry,
Subcatchment da•5: Drainage Area #5
Mt Airy Quarry_sldmmerbasins NOAA24hrC 10-YwR8fnla&al6'
Prepared by Microsoft Footed 1212312020
INdmCAO®10.&21 sfn 10247 C 201e HMmCAO SoMvmeS*b%LLC Page 18
Summary for Subcatchment da-6: Drainage Area #6
Runoff z 13.90c(s @ 12.18 hrs, Volume= 1.055 af, Depth= 2.87'
Runoff by SCS TR.20 method, UH=SCS, Weighted-CN, Time Span= 0.00-90.O1) hrs, dk 0.05 hrs
NOAA24-hrC 10-Year Rainfall=5.18'
To Length Slope Velocity Capady Description
(min) fleet) (Mt) Mac) (CIS)
10.0 Direct Entry,
Subcatchment da•6: Drainage Area 96
30
®ftunoll 1$
R ftunolf
2e
2].SB d4
NOAA 24-hr C
14
taBBU
NOAA 24-hr C
24
10-Year Rainfall=5.18"
12
10-Year Rainfall=5.18"
22
Runoff Area=8.720 ac
11
Runoff Area=4.420 ac
20
Runoff Volume=2.082 of
W
Runoff Volume=1.055 of
fi:
Runoff Depth=2.87"
? a
Runoff Depth=2.87"
14
Tc=10.0 min
]
Tc=10.0 min
12.
CN=78
a
CN=78
10
5
e
4
8-
3
4
2-
0
10 15 20 25 30
0 5 id 15 A ?5 h0 %
70

Mt Airy Quarry_skimmerbasins NOAA24-&C 11?YearReinfa1k5.18'
Prepared by Microsoft Noted 12/2312020
HKIMCAD010.00-21s/m102470aDI8HydmCWSoftwere Sokmk LLC P io
NOAA24-hrC 10-YearRefnfalk5.18'
Printed 12/23/2020
Summary for Pond 1P: shimmer basin #1
Summary for Pond 4P: tam skimmer #4
Inflow Prea= .67CISc, 0.00%12.18 m, Volum, InflowDepN= 2.BT for 10.Yearavent
Inflow, 24.97cs® 12.26hrs, Volume= 1.662 of
Inflow Area= 7.500 so, 0.00%ImPmWs, Inflow DePlh= 287' for 10-YOW event
Outllow 2 10.02da@ 12.70 hrs, Volume= 0.397 a1, Atien=19%, Lag=52 min
Primary = of
cs@ 1226Ins, Voume=
Inflow 23.72cs® 12.18hm Volume= 1.791 e1
Outflow = 19.18cs@ 1228hm, Volume= 1,631 at. Aflen=19%, Lag=52 min
9.86
SecoMary= 19.86 csM 122fi Ars, Vokalls 1289 a1
1289
Prbnary = 0,06cfs 10.75hm. Volumes 0.397 a1
Secondary= 19.12cfs@ 122SWs, Volume= 12M a1
Routing by SIDr-Ind meNod, The Span=0.00.g0.D0 hrs. dt=0.05 hrs
Peak FJer-i,00B.53®12.26 Ars SudNea=0.202 arc Storage=0.605 at
Rou0n9 by S'Por-Ind meMod, The $pan=0.00.90.00 hrs, tlk 0.05 hrs
Peak EWm 1,D01.51'®12.26 his Sud.Area=0.196ec Sbra9e=0.5838f
Plug -Flow detan8an time-- 5938 min MIQUlasd for 1.685 at(90%ol inflvH)
CenlenoFMass deL hna= 547.5 min (1,380.0-8325 J
PWgFbwdateneon 6nw= 609.9min cakussd for 1631 al(91%0l sflox)
ContarabMass dat 6rla= 564.0min (1,396A - IM5 )
Volume Imed AvaBSbxme Slaraoe Descrro5on
#1 1,005A0 0.922 aI 54.00W x 115.OPL x 5.00'H Pdsmatold Z-2.0
#1 Pdmery 1,005.W 0.060cisConstam Flow/Skimmer Phase4n=0.33'
#2 Secondary 1,008.00' 15.V longs 1.00, dse Sharp -Crested RectangularWdr 2End Contraction(s) 1.0CreslHeight
Mmy OuTim Max=0.05 cis Q 10.70 hrs HW=1,005.33 (Free Discharge)
=Constant Row18Mmmer (ConstanlCon#ots0.08ds)
Secondary CuFlow Mac=19.11 cis@ 12.26 insHW=1,008.51' (Free Discharge)
12SharpCrosted Rectangular Welr (WOkConbas 19.11 cis @ 2.49 fps)
Pond 1P: skimmer basin #1
■mnmv
Inflow Area=7.800 ac
!mow
Peak EIev=1,008.53'
Storage=0.605 of
Volume toed Avafl Sbrme Sloraae Desuiotion
91 998.00 1.126 of 5200W x 115A01 x 6.00'H Pdsmatold Z-10
Dedca RouUna Imed Outlet Davkes
#1 Prbnary 998.W 0.060cs Constant Flow/Skimmer Phase4n=0.33
#2 secondary 1,001.W 1&W[Ongx1A0'dse MMPCrested RbdmgutarWalr 2 nd Conhacdoo(s) 1.01CMtHelght
mary OUtRow Mar-0.D8cfs@10.75hre HW=99835' (Frea Discharge)
=Constant Flow/Sldmmer (Constant Conbds 0,06 da)
tSecondary OutFlow Max=18.39 cis Q 12.26 hm HW=1,001.50' (Free Discharge)
2=SharyCrested Rectangular Weir (Wei(Combos 18.39de ®2.46 (ps)
Pond 4P: tam skimmer #4
■innow
Inflow Area=7.500 arc
r. o now
semnmw
Peak EIev=1,001.51'
Storage=0.583 of

l'
NW 241WC 10-YearReialetk518'
Primed 1272 IMU
Mt Airy quarryskfmmedlaelns NOAA244rC 10-YearRam/a/k51S'
Prepared by Microsoft Printed 1272N M
HydmCAD010.0021On 1024702m8HudroCADSft*sreSohalons LLC Pena 22
Summary for Pond 5P: skimmer#5
Summary for Pond 613: skimmer#6
Inflow Area= 8.720ac, 0.00%impervious, Inflow Deplh= 2.87' for 10-Yearevent
Inflc.Aea= 4A2Dac, 0.00%I mls, In8ow0epat= 28T for 10-Yearevent
inflow= 27.58 ols® 1218 hrs, Volume= 2082 a1
Inflow = 13.98 ck@ 12.1E hrs, VoVolume= LOSS of
Outflow = 22.54ds@ 1226hrs, Volume= 1.896 a1 Atlen=18%. Lag:5.0 min
Outflow = 9.70ch@ 12.29hm, Volume= 0.880al, Atten=31%, Lag=6.8min
Primary = 0.07ck® 11.80hm. Volume= 0.434 of
Primary = 0.03 cis@ 11.90hrs, Volume- 0.194 of
Secondary= 22.47 cis® 1226 his, Volume= 1.462af
Secood ary= 9.67 ck@ 12.29 hrs, Vohara.= 0.686 of
Fouling by Sox-Indmeatod, Time Spier 0.00.9D.00 hrs, dt=0.05 his
Roulmg by Sbr4nd treated, Tens Spanroa=0.90.00c urs
Peak nee-978.5T@1226 ias SudArea=0.220 ac SVW 0.668 a1
Peak Ebv=980.33®1229 hrs SudAra8=0.139 ac Smrage=0.382 of
Sb-d.050.3
Plug -Flow detention tir�- 567.2min cakulabd for 1.896 of (91%olinflow)
Plug -Flow detantion tlme= 6D6.3 mat cmkulated ferO.880 al(83%of inibw)
Canter -of -Mass dal trw 521.1 min (1,353.5-832.5)
Cenral -Mess dot dme=5M.6 min (1,368.1 - 832.5)
Volume Invert Avall.Shreie SlorageDemiolion
#1 975.08 1.002af 53.00'Wx12800'Lx500'HPdsmatold Z=2.0
Device Routing lrorert OutletOevices
#1 Primary 976.00' 0.O70cfs Constant FlowlSkimmer Phass-In=0.33'
lit Secondary 978A0 15.0' long x 1.00'dse Sha nulled RectangutarWair 21ind Coneaclion(s) 1.00nsl Hdghl
Volume Invert AvaBSbraoa Screw DBscdPBen
#1 977.00 0.636al 41.00'Wx98A0Lx5XHPdwatold Z=2D
#1
#2
978.W 0.03Dcfs Constant FlawtSMmmer Phasaln=0.33'
990.00' 15.04ongx 1.00'dse SharyCrested Rectangular Weir 211nd Conbacton(s) 1.0Crest Height
primary WlFlew Max=0.07 cls 6811.80 hrs HW=976.39 (Free Discharge) �rimmary gdFlw Maur-0.03 cls@11.90hn HW=978.42 (Free Discharge)
T ixonslentFlw7Skimmer (ConstatuConbok0.07cfs) t-I ConstantFlw7Sidmmer (ConstantCon8ok0.03cls)
Secondary OutFlow, Mar=21.88 cfs®12.26 his HW=978.56' (Free Discharge) Sec2ondary OulFlw Max=9.46 cis Q 12.29 Ins HW-980.3Y (Free Discharge)
L2=Sherp-Crested RectangularWelr (WeirConaols 21.88cis @ 2.62 fps) L--Sharp-Crested Rectangulu Weir (Weir Controls 9.48ck @ 1.94 fps)
Pond 5P: skimmer#5 Pond 6P: skimmer#6
z7. sn ®o nw. lase w. :-moo,.
Inflow Area=8.720 ac ®n" n°,,°m°°=n
:...6econnarr 1$ Inflow Area=4.420 ac
Arz. Peak EIev=978.67' 14. Peak EIev=980.33'
Storage=0.668 of 1' Storage=0.382 of
eam
"I I f
m - - ry /n W 0.5 W 0 5 10 15 20 25 30 M 40 45 50 55 60 65 70 75 60 e5
Vw rn nl nmu tnow.l

r y'
Mt Airy Quarry_skimmerbasins
Prepared by titimosoil
HWmCAO®1000.21 s/n 10247 02018 H1dmCAD
NOAA244VC 100-YearRainfalk8.03'
Printed 122312020
Sollwem Solutions LLC Paw 23
Time span-0.00-90.00 his, d1=0.05 two, 1801 points
Rmmff bySCS TR-20meNod. UH=SCS, WeOL4CN
Reach muting by Smrdnd*Trans method - Pond muting by Smr-Ind meted
Subcatchment dal: Drainage Area #1
RumffAms7.000 as 0.00%Impervious RomeDeplh=5.4T
W11.0mn CW78 Rumlf-45.99crs 3522M
Subcalchment dad: Drainage Area 94
Runoff Area=7.500 or 0.00%Impervous Runoff Dep0K5.42'
W0.0 min CW70 Ruwff-44.22gs 3.387af
Subcatchmenl day: Drainage Area#5
RunoffAres8.720 ac 0.00%Impervous Runoff0eplh=5.4Y
Ta10.0 min CN=78 Runoff=51.41ch 3.938at
Subcatchmem da-6: Drainage Area#6
RumffAmsJ.420 as 0.00%Impervious RunoeDepm=5.42'
T"10.0mn CN=78 Runoff=26A6cfs 1.996at
Pond iP: skimmer basin a1
Peak Ekr-1,008.88' SWaW--0.676 at Imflm -45.99cb 3.522 at
Primrr0.06 cis 0.408 at SecprAay44.02 cis 2 Mal 0~-414.08 cis 3.345 at
Pond 4P: rem skimmer94
Peak EW--1,001.86' Slamge-0.650 at relish-44.22cts 3.387 at
Prknar0.06 cis 0.408 at Secondar-4ZN ds 2819 of Out 42.43 cgs 3.227 of
Pond SP: skimmarlIS
Peak El --g78.94' Slom9e-0.750 of Inlbr-St.bt cis 3.938 of
Pmur0.07 cis 0.441 at Semndar-49.03 cis 3.310 at Ovff r49.10 nos 3.751 at
Pond 6P: skimmedl8
Peak El --980.61' Stampe=0.423at Inlbr-26.O6cfs 1.996 at
Primary=0.03cts 0.197of Semnday-25.22ofs 1.624af 0utnov--25.25ds 1.821 at
Total Runoff Area =28.440 ac Runoff Volume - 12.842 at Average Runoff Depth -5.4r
100.00%Pervious-28.440ac 0.00% Impervious -0.000ac
Mt Airy Querry_skimmerbashms NOAA"C 100•YwRafnfall-w
Prepared by Microsoft Prince 1223I2020
HydmDADS 100021 s/n 10247 02018 HcmCAD Software Solutions LLC Pane 24
Summary for Subcetchrienl dal: Drainage Area #1
Runoff = 45.99 cis@ 12.17 hm, Voluma= 3.522 of, Depth-- 5.42'
Runoff by SCS TR-20 method, UHSCS, Weights"N, Tune Span=0.0090.00 hm, dh 0.05 its,
NOAA244rC lWYearRainfal-4.03'
Area(ec) ON Description
7.800 100.00%Perhous Area
To Length Slope Valociy Cape* Desoipbon
(min) (faan (M140 (Nsec) (eb)
10.0 Direct Entry.
Subeatchmenl da-1: Drainage Area #1
w� NOAA 24-hr C
100-Year 1 Rainfall=8.03"
Runoff Area=7.800 ac
_ Runoff Volume=3.522 of
an
S Runoff Depth=5.42"
n Tc=10.0 min
2p. CN=78
m Rumn

Mt Airy Quarry—skimmerbasins NOAA24dvC 100-YearRainfa!08.03' MtAlry Quarry_skimmerbaslns NOAA24hrC 100-YearRainfelk8.03'
Prepared by Mcrosoft Printed 12R3UM Prepared by Microsoft Printed 12/2312020
HvdMCAD®10.OLL21 s7n 10247®2018 HvdMW Software SoluWs LLC Paw 25 Ihdm M10 M21 Nn 111247 M MIRHwlm(:ADSnMnm Snl,arnc I I C. D...0[
Summary for Subcatchment dad: Drainage Area #4
Runoff = 44.22 cis@ 12.17 firs, Volunn 3.387 at Depth= SAT
Runoff by SCS TR-20 method, UH=SCS, Weighletl-CN, Tme Span= 0.00P90.00 hrs, dt-- 0.05 lure
NOAA24-hrC 1DDYeer Rainfall=8.03'
To
Desaiption
Subcatchment dad: Drainage Area #4
D Rwroll
NOAA 24-hr C
40 100-Year Rainfall=8.03"
35 Runoff Area=7.500 ac
30- Runoff Volume=3.387 of
35 Runoff Depth=5.42"
20 Tc=10.0 min
CN=78
W 35 0 45 50 55 W
11n" 1n�u.)
Summary for Subcatchment da•5: Drainage Area #5
Runoff = 51.41 cls @ 12.17 his, Volume-- 3.938 at, Depth= 5.47
Runoff by SCS TR-20 method, UH=SCS, WeighedCN, )-me Sperm 0.00-90.00 his, OF 0.05 his
NOAA24-hrC 1006Year Rainfall=8.03'
Area(ac) CN Dexdption
8.720 78
8,720 100.0D%P&*us Area
To Length Slope Veociy Capanly Desuiplion
(min) (feet) (fVft) (Nsec1 (cfa)
10.0 Direct Entry,
Subcatchmerd da•5: Drainage Area #5
s0
NOAA 24-hr C
45
100-Year Rainfall=8.03"
w
Runoff Area=8.720 ac
35
Runoff Volume=3.938 of
1
3e
Runoff Depth=5.42"
ae
Tc=10.0 min
20
CN=78
p'a� —
a s 10 1s ill
35 40 45 W W W e5 70 is
In.. llw"1
a Runoff

K t Airy Quarry_skimmerbasins NOAA 244Y C IMYeerRein1e1k8.03'
Prepared by Mansell Printed 1202020
HydmCADO 10.00-21 sin ID247 02018 HYdmCAD Software Solutions LLC Fees, 27
Summary for Subcatchment daft: Drainage Area #6
Runoff = 26.06ds@ 12.17hrs, Volume= 1.9%at Depth= 5.42'
Runoff by SCS TR-20 methoQ UH=SCS, Weighted-CN, Time Span=0.00.9D.OD hrs, dk 0.05 hrs
NOAA24hrC 1DO-Ym Rainfall=8.03'
Tc Length Slope Velocity Capacity Description
(min) (feet) (NB) (Msec) (c(s)
10.0 Direct Entry,
Subcatchment da-6: Drainage Area #6
e nwon
R1 I ■ NOAA 24-hr C
' 100-Year Rainfall=8.03"
p Runoff Areal ac
1B I Runoff Volume=1.996 of
18 Runoff Depth=5.42"
3 14
u 12 Tc=10.0 min
10 CN=78
o
0 5 10 15 rig 25 e0 35 40 45 W 55
h t Airy Quarly_skimmerbasins NOAA 24-hrC 100-Year Raimalk6.03'
Prepared by Microsoft Printed 12723r2020
IydmCADO 10.%21 sin 10247 02018 HYdmCAO Software SoMars; LLC Papa 28
Summary for Pond 1P: skimmer basin #1
Inflow Area= 7.800 ac, 0.00%Impervious, Inflow Depth= 5.42' for tODYearevenl
Inflow = 45.99 cfs@ 12.17 hrs, Volume= 3,522 of
Dutlbw = 44.08 cls@ 12.21 his, Volume= 3.345 at Allen=4%, Lag-2.0 min
Primary = 0.06 cgs@ 8.10lus, Volume= 0.408 at
Secondary= 44.02 cfs@ 12.21 hrs, Volume, 2938af
Routing by Stor-Ind method, Time Span= 0.00 90.00 hrs, dk 0.05 hrs
Peak Elev=1,008.8r @ 1221 hrs SurfArea=0.20B ac Storage= 0.676 at
Plug -Flow detention time=3126 min calculated for 3.344 at(95%of inflow)
Centarof-Mass dot lime= 286.2 min (1,100.2- 814.0)
Volume Invert Aval.Slorane Storage Description
di 1,005.00 0.922 at 54.00'Wx 1MWILx 600111 Msmatad 2=2.0
Device Routine Invert Outlet Devices
61 Primary 1,OD5.DO' 0.060cfs ConstantFlorlSkimmer Phase-In=0.33
#2 Secondary 1,008.DO' 15.0'Iongx1.00'rise Sharp -Crested Rectangular Weir 2End Conbaction(s) 1.0rCreslHeight
TeryOutFim Max=0.D6cfs@8.80hrs HW=1,005.34' (Fare Discharge)
Constant Flow/Skimmer (ConstantConeols O.D6cfs)
Secondary OuLI low Mac=13.56 cfs @ 12.21 hrs HW=1,DD8.8T (Free Discharge)
,.SharpCrested RectangulerWelr (Web Conbols43S6cts@3.38fps)
Pond 1P: skimmer basin #1
non. (sar..)
■ 4nw
Inflow Area=7.800 ac
f �Oumox
®„
Peak Elev=1,008.88'
Storage=0.676 of
65 70 75 e0

v
Mt Airy
NOAA24-&C f00-YearRafnf8lk8.03' Mt
Man iL237M PR
Summary for Pond 41): tern skimmer#4
Inflow Am= 7.500 ac, 0.00%Impervious, Inflow Depth= 5.42' for tODYear event
Inflow = 44.22cN@ 12.17 hrs. VoM1nre= 3,387 at
OuBios = 42.43 cfs@ 1221 as. Volumes 3.227 at. Aeert=4%, Log=2.0 min
Primary = 0.06 oft @ 8.80 hrs, Volume= 0.408 at
Secondary= 42.37CfS @ 12.21 hrs, Volume= 2.819 at
Rating by Slur -Ind mabod, Time Span= 0.0090.00 hrs, el= 0.05 has
Peak Eler-1,001.86'@12.21 has SudArea=0.202 as Storage= 0.650 of
Plug- b deam on lone=322.4 min calculated for 3.227 at(95%of inflow)
CenteroWass dot time= 295.5 min (1,109.5. 814.0)
Volume Imed AallSaraoe Storage Description
#1 998.00 1.126af 5200Wx115.0TLx6.0PHPdsmstold Z=20
Device parking Invest OudetDevkrs
#1 Prmary 998X 0.060 ark Constant FlowlSkimmer Phase-In=0.3Y
#2 Secondary 1,001.00' 1&0'Iong x 1.00'dse Sharp -Crested Rectangular Weir 2 End Comrsown(s) 1.0'Crest Height
MryOutflow Max=0.O6ds@8.80hm HW=996.34' (Free Discharge)
onslantFbwlSFlmmer (ConslantGonkds O.O6cla)
7OaryOutfow Max=41.95cls@12.211m HW=1,001.SS (Free D'echarys)
-SharµCrested Rectangular Weir (Wek Controls 41.95c1s @ 3.33 fps)
Pond AIR tem skimmer #4
®wrox
Inflow Area=7.500 arc
M
e Mary
Peak Elev=1,001.86'
Storage=0.650 of
NOAA244YC 100-YearRainfalh8.03'
Printed 122312020
Summary for Pond 5P: sidmmer#5
InfbwArea= 8.720ac, DOD%Imperious. Inflow Depth= 5.47 for 100-Yearevent
Inflow = 51.41 cis@ 1217 hrs, Volume 3.938 of
OuNow = 49.10cis@ 1221 has, Volume= 3.751 at. A11en=4%, La9=20 min
Primary = 0.07cfs@ 10.70hm. Volume, 0.4418I
Secondary= 49.03 cis@ 1221 has, Valums 3,310 of
Routine by Slur -Ind method, Txre Span=O.M90.00 Ns, dt- 0.05 hrs
Peak EImm978.94'@12.21ms SudAee=0.227ac Sterage=0.750af
Plug-Fbw detention fore= 299.3 min calculated for3.749 of (95%of Inflow)
Centerof-Mass del hna=274.5 mn (1,088.5-814.0 )
Volume Imart Avafl.Sbrege Saxage Daunoeon
#1 975.D0 1.002at S3.ODW a 128.001 x S.00'H Pdsmatob Z=20
#1 Primary 976.00 0.070 cis Constant RowlSMmmer Phaseftr 0O T
#2 Secondary 97890 15.0'Iongxl.Oddse Sharp -Crested Recl gWwWab 2End Commkon(s) 1.00mgHWghl
Qrimary Outfow Max=0.07 cis@10.70 Kra HW=976.36' (Free D'actux")
-Constant FlowlSkimmer (Constant Conant 0.07 c1s)
tSecondary OutFlow Mu=48.46 cfs@ 12.21 hrs HW=97693 (Free Discharge)
2=Sharp-Crested Rectangular Weir (Weir Con" 46.46cfs @ 3.51 fps)
Pond 511s: skimmer#5
tt
Inflow Area=8.720 ac
®a;.w
Peak Ele�r-978.94'
Storage=0.750 of
'^' "' •`• •' •^• w ^• 0 s 10 la M n M 35 40 45 50 55 no 65 70 75 em M so
>ama marnl
Ti- Inou.l

Mt Airy Quarry_skimmerbasins NOAA244FC 1Q0-Year Reinie&8.O3=
Prepared by Morlmil Printed 12/2 MO
Hy>imCADO10.00-21 sin 10247 02018 HvdnaCAD BORrae Solutions LLC PM 1
Summary for Pond 6P: skimmedi6
Inflow Area= 4.42O ac, 0.00%Impervious, InBowDepth = 5AT for 10O-Yearevent
Inflow = 26.06cis @ 12.17 hrs, Valurne= 1.996 at
Outlaw = 2525cfs@ 12.20hrs, VOWre= 1.821af, AI@n=3%, Lag=1.86n
Primary = 0.O3cfs® 10.95hm, Volume O.197af
Secondary= 25.22 cis® 12.20 hrs, Volume= 1.624 of
Routing by Stgr-Ind method, Tine Spen-0.00-90.00 hrs, dh- 0.05 hrs
Peak Elev- 980.61'@ 12.20 hrs SuriArea=0.143ac Storage=O.423af
Plug-Fkrwdetentinn Ume= 3%4 min calculated for 1.821 of (91%0l infloM
Centeno/Mass del time= 269.8 min (1,0113.6.814.0)
Volume Invert Avail.Srocage Storage Description
#1 977.00' 0.636 at 41.ODW x 98.00'1. x 5.O0'H Prismatold Z=2.0
Devise Routing Invert Outsel Devices
#1 Primary 978.00' 0.030cts Conslam FIMISklmmer Phasaln=0.33
#2 Secondary 980.W 15.0'Iongxl.00'dse Sherp-Crested RoomqutwWek 2Emd Conoac8on(s) 1.0'Cmst Height
primaryOutFlow Max=0.03cfs@10.95hrs HW=978.37' (Free Discharge)
T lxonslam FlowlSkimmer(Content Controls 0.03 cis)
Secondary OulFlow Mac=25.10 cis @ 12.20 hrs HW=980.61' (Free Discharge)
LL2--SharpCrested Rectangular weir (Weer controls 25.10 cis @ 2.75 fps)
Pond 6P: skimmer#6
■ mmw
Inflow Area=4.420 ac
n anmw
ow
Peak Elev=980.61'
Storage=0.423 of

da-2
Drainage Ar #2
riser2
riser basin #2
subcat Reeoh on (Link;
da-3
Drainage AT a #3
3P
riser basin #3
Mt Airy Quarry_daerbasins_mIsed
Prepared by Microsoft PdQW 12 2020
HHYdmCA0910.0a21 s/n 102479201E!hdmw So0rmasokejm LLC Pa
Area CN Desu'*n
(maesl (SWX* oenF bms)
55,700 78 (da2, W)
55.700 78 TOTAL AREA
Area UWR9 (all nodal)

Mt Airy Quarry_deerbasins_revised
Prepared by Microsoft Printed 1323020
HydmCAD010.00.21 s/n 10247 ® 2018 Hrft= Sollsram Soludm LLC I Page 3
Soli Usting (all nodes)
Area Soil Subc &h=nt
(aces) G=P Numbers
0.000 HSGA
0.000 HSG B
0.000 HSG C
0.000 HSG D
55.700 Other da•$ W
55.700 TOTAL
AREA
Mt Airy Quarryliserbasins_revised
Prepared by Microsoft Printed 1223rM
HWMCAD®10.00.21 sfi 10247 ® 2010 HWMCAD Software Sok&ns LLC Pace 4
Ground Covers (all nodes)
HSGA IiSGB
HSG-C HSGO
OUm Total Ground Subcat&mrd
(aces) (cues)
(aces) (acres)
(acres) (acres) Cover Numbers
M U0o
0.000 0.000
55.700 55.70o da-Z da-3
0.000 0.800
0.000 0.000
55.700 85.700 TOTAL
AREA

9
11
Mt Airy Quarry_riserbaslns_revlsed
Prepared by Microsoft
Printed 12123/2020
HWmCADA 10.00-21 sfi 10247 ® 2018 !ydm=
Software Solutions LLC
Pace 5
Pipe LlsBng (all nodes)
lice# Node In -Invert
Outtrw d
length
Slope n DbnslWidth
Heigh
Insk%-FM
Number ("
Me!)
Oeetl
(tuft) (tn IM)
r'urches)
(Inches)
1 3P 1.009.00
1.OMOD
MO
0.0682 U25 1&0
0.0
0.0
2 dwd 99b.00
OKOO
96.0
0.0521 0.025 24.0
O.0
0.0
Mt Airy Quarry,fiserbas(ns_revised NOAA 24-& C 2-Year Rainfa&3 48'
Prepared by Mlmwft Printed IM3/20M
hit dVCAW 10.00.21 sM 10247 ® 2018 Mvdm= Sarwm Sokoons LLC Pane 6
Time sparr=0.00.120.00 bra, d1-70.05 firs, 2401 ponds
Runoff by SCS TR-20 method, 11H==, weighted-CN
Reach roullng by Stor4nd+Trans method - Pond routing by S1or4nd method
Subcatchment, dr}2: Drainage Area 02 Rurwff Area--34.700 ac 0.00% Impervious Runoff Depths1AIr
Tcr-laO adn CN=78 Runoii=58 55 cis 4.286 of
Subcatchmmrt da-3: Drainage Area 03 Runoff Area`21.000 ac 0.00% Impervbus Runoff Depths1.48'
Trr10.0 min M78 Runoff=34.23 cfs 1594 of
Pond 3P: riser basin 03 Peak Elev-1,020.14- Storape=79,938 d Inflowr=34.23 cfs 15M of
Outtlowa1.33 cfs 2183 of
Pond rlse2 riser basin 02 Beak Elw-I.007.4T Sbrage=170.203 d Wbwr WLW ds 4.286 of
ftwy-0.34 cfs 1070 of Secondary--0.00 cfs 0.000 of Offm--0.34 ds 1070 of
Total Runoff Area a 55.700 ac Runoff Volume a 8M of Average Runoff Depth a 1.48'
100.00•% Pervious a 55.TOO ac O.00% Impervlous a 0.000 ac

Mt Airy
NOAA 24hrC 2-YearRelnfe1k3.48'
Printed 12/2312020
Summary for Subcatchment da•2: Drainage Area #2
Runoff = 56.55cB@ 12.181rs, Volume= 4.286 at, Depth= 1A8'
Ruston by SCS TR40 method, UHSCS, Weighted-CN, Tine Span= 0.00.12D.00 tyre, dt= 0.05 his
NOAA24-hrC 2-Year Ralnfall-3.48'
34.700 100.00%Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (Nff) (fflsec) (Its)
10.0 Direct Entry,
Subcatchment da-2: Drainage Area #2
Mt Airy Querry_dserbasins_revised NOAA 24-hrC 2-Year Rainfall-3.48'
Prepared by Micresoll Printed 1212312020
HydmCAO®10.00-21 sin 10247 02018 HydmCAD Sofmae Solutions LLC Pace 8
Summary for Subcatchment da3: Drainage Area 93
Runoff = 34.23 cis@ 1218hs, Vobur 2,594 at, Depth= 1.48'
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Tune Span=0.00-120.00 hrs, tlk 0.05 runs
NOAA 24-hrC 2-Year Rainfen=3.48'
Area(ac) CN Description
21.D00 78
21.000 100.00%Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (fear) (MO Mae) lets)
10.0 Direct Entry,
Subcatchment da-3: Drainage Area #3
e Ru wn
an
W55 cis
w
55
NOAA 24-hr C
'°
NOAA 24-hr C
2-Year Rainfall=3.48"
30
2-Year Rainfall=3.48"
5
Runoff Area=34.700 ac
26
Runoff Area=21.000 ac
40
Runoff Volume=4.286 of
24.
Runoff Volume=2.594 of
Runoff Depth=1.48"
a p
Runoff Depth=1.48"
Tc=10.0 min
1B
Tc=10.0 min
'
CN=78
+
CN=78
0 5 10 15 as 25 30 35 +0 45 W 55 W 65 70 75 N 95 W a5 IN iM 110 115 1M 0 5 10 15 20 25 30 35 4 +5 W 55 W 55
In. (Noun) none Inwn)
DRWon

NOAA24-NC 2-YWRamfal1=3.48' Mt Alry
Printe01Y23/2020 Pmparet
Summary for Pond 31o: deer basin #3
InflowArea= 21.ODOao, 0.00%Impervbus, InMwDepU= 1.48' for 2-Yearevenl
Inflow = 34.23ds@ 12.18hm, Vohwne= 2594 of
Outlier = 1.33cfs@ 15.93hm, Volume= 2.183d, AIten=96%, Lag=224.7min
Primary = 1.33ds@ 15.93hm, Volume= 2.183 a1
Reuling by Sir -Ind method, Time Span= 0.00.120.OD tam, dt-0.05 hm
Peak Flev-- 1,020.14'@ 15.93 has SudJVes 31,482 at Singe=79,936 of
Plug -Flow Meado ntine:2,313.2ran calculated IN 2.182 at(84%of inflow)
Center-0Wass 0eL tims 2,2429 Mn (3,094.7 -951.8 )
Volume Inver) AvaitSbraae Somas Description
a1 1,016.W 346,839d Custom Stage Data(Risma0c) Listed bebw(Rec*)
Elevation
SmfArea
Inc.Sbre
Cum.Sbre
(Iee0
(so-N
(cu is-(eell
(cubiuleet)
1,016.00
5,130
0
0
1,017.00
12,451
8,791
8,791
1,018.00
19,773
16,112
24,903
1,019.001
25,292
22.533
47.435
1,020.00
30,812
28,052
75.487
1,021.W
35,503
33,168
108,645
1,02200
40,194
37,849
146,493
1,023.00
44,885
42,540
189,033
1,024.00
49,576
47,231
236,263
1,0250
55,130
52.357
288,620
1,026.011
60.700
67,919
346.539
Deft Roubina
Inved OulletDevices
#1 Prvnary
1,DOLW ISO' Round Culvert 1.=132V CMP, square edge headwall, Ka=0.5W
Inlet/Met Inert=1,009.0711.000.W 5-0.0682'r Cc-0.900
n=0.025 Conugaledmetal, plow Area=1.77sf
82 Device
1,016.00' 0.170cfs Constant Flonaftmmar Phase-In=0.37
#3 Device
1,020.W 24.0'Hcrla.OnticWA*e C=0.600 L4nikdbnstrsowallowhead5
Primary Outiclow MW.28 cis@ 16.93 hm HW=1,020.14' (Fme Discharge)
t- -Culvert (Passes 1.28 cis of 18.96 cis potential now)
t2=Constant FIcwMdmmsr (Constant Controls 0.17 cis)
3=008catGrate (Wer Controls lAl cis @ 1.241ps)
Pond 313: riser basin #3
Hyd.,.ph
TNrs Orowsl
NOAA 24-hrC 2-YearReinfe1P3.48'
Printed 122320M
■ ems.
■ P,Imary

Mt Airy Quarry_dserbasins_revlsed NOAA 24-hrC 2-YWRainf8&3.48'
Prepared by Micmmft Printed 1212=O
HOMCADO 100D21 sfn 10247 ®2019 Hj*oCAD Software Sokdans LLC Pare 11
Summary for Pond dse2: riser basin #2
InO wArea= 34.700 ac, 0.00% Impandmis, Inflow Depth 1.48' for 2-Year even)
Inflow = 56.55cfs@ 12181us, Volume= 4.286 at
Outflow = 0.34 cis® 11.25hm, Volume- 3.070 af, Allen=99%, lag=0.0 min
Primary = 0.34cls® 11.25hrs, Volume= 3.070 of
Secondary= 0.00 cis® 0.00 his, Volume= 0.000 at
Rouling by Sav-Ind me8md, Thee Span=0.00-120.00 hm, dp 0.05 has
Peak Eler-1,007.4T@24.18Me Sad.Area=45,945sf Sbraee=170,203ci
Plug-Fbwdetentom tire= 3,173.3 min calculated for 3.069 at (72%ut inflow)
Center Klass daL tow 3,0722 min (3,924.0-851.8)
Volume
Invert Avail Sbrare
Sbrene
Desaiup,n
#1
1,00200' 418,905ci Custom Stage Data (Prismatic) Listed bekm(Recab)
Elevation
SWAM
Inc.Sbre
Cumsbre
((ee0
(W)
(abic(eag
(cuMc-Meet)
1,002.DO
7,460
0
0
1,003.00
18,73D
13,095
13,095
1.004.00
29,997
24,364
37,459
1,005.00
34.825
32,411
69,870
1.006.00
39,660
37,238
107,107
1,007.00
43,920
41,705
148,892
1,008.00
48,190
46,055
194.947
1,D09.00
S,134
50,162
245,109
1,010.D0
56,078
54,106
299,215
1.011.00
59,845
57,962
357,177
1,012A0
63,612
61,729
418,905
#1 PAnary
995.00 24.0' Round Culven L=96.0 GMP, square edge headwall, Ke=0.500
Inlet/Oud&tlnven=995.00/99D.00 S=0.05217 Ca0.900
n-0,025 Cormated metal, Flow Area=3.14 s(
#2 Device1
1,002.00' 0.340cfs Constant FlewfSklmmer Phase-In=0.33'
#3 Device
1.008.00 36.0'Horiz OriOcWGrate C--O600 Limited b war flowatbw needs
#4 Secondary 1,009.00 25.0'bngxl.00'dse Sharp-Cresled RectangulwWelr 2End Gmtraction(s) 1.0'Cresl Height
primaryOutFlow Mas=0.34 cfs @ 11.25 hre HW=1,D02.33' (Free Discharge)
` - -CuNart (Paseea 0.34 cho133.30 cfs pomneal a rM
2-Ccastant FlowlStdmmer (Constant C'enbofs 0.34 cis)
3=OrmcelGrate (Ccmaols0.00cls)
Secondary OutFim Mas=0.00 cls@ 0.00 hm HW-1,002.00 (Free Discharge)
Sharp -Crested Rectangular Weir ( Controls0.00 cis)
M(Alry
NOAA 24-hrC MeerRaWell-3.48'
Printed 17/2Y=
Pond dse2: riser basin #2
■ InIW
Inflow Area=X700 ac
May
Peak Eler-1,007.47'
Storage=170,203 cf

Mt Airy Quarry_dserbaslns_revised NOAA 24-hrC 10-Year Rainfet-5.18'
Prepared by Microsoft Printed 12a=20
HOMCADO 10.0a21 sin 10247 02018 HYdmCAD Saftwam Solutions LLC Pan 1
Tone sp w:O.WI20.00 hm, tlk0.05 hrs, 2401 points
Runoff by SCS TR-20 me0iod, UH=SCS, WeighWCN
Reach roofing by Slor-Ind.Trans method - Pond roofing by Sh7r-Ind method
Subcatchment dal: Dralnage Am s2 RumffAma=34.700 ac 0.00%larpervaa RonneOeplh=20T
TGIO.Omn CN=70 Runoff=109.74cfs a.205af
Subcatchmenl da.3: Drainage Am e3 RurmffAiea=21.0DOw 0.00%Impervbus Runoff Depth=tar
Tc-10.0 min CN=78 Runo&66.41 cfs 5.014 of
Pond 3P: dser basin a3 Peak Elev=1,020.85 Storage-103,431 cf Ineor-66.41 cfs 5.014 at
0.111 -14.12 cfs 4.596 of
Pond dser2: risertmin 92 Peak Enr-1,00&46' Swne=217,466 cf InPar-109.74 cfs 0.285 of
Prmmr=9.95cfs 6.445af Sewndwr0.00ch 0.000al Ou%m=-.96cfs 6.445af
Toml Runoff Ama=55.700ac Runoff Volume -13299 a1 Average Runoff Depth=2.87'
100.00%Pervlous=65.700x 0.00%Impervious=0.000oc
Mt Airy Quarry_daerbasins_revised NOAA24-hrC 10-YwRamfeft-5.18'
Prepared by Microsoft Printed 12/2312020
HydruCAD010.0).21 sin 1024102018HvdmCAOSoffwam Solutions LLC Pace 14
Summary for Subcatchment de-2: Drainage Area 02
Runoff = 109.74cfs@ 1218hm, Volume= 82M at, Depth= 2.9r
RuwI by SCS TR-20mellmd, UH=SCS, WeighmdCN, Tore Span; 0.00.120.00 hrs, dt= 0.05 hrs
NOAA24-hrC 10-Year RamW=5.18'
34,700 10D.00 %Pervious Ama
Tc Length Slope Velocity Capacity Description
(min) ffee0 fNff) (Nsec) Mal
10.0 DOxt Entry,
Subcatchment da-2: Drainage Area #2
Hydropmph
120
Ire ]a es
110 NOAA 24-hr C
tv0 10-Year Rainfall=5.18"
ep, Runoff Area=34.700 Sic
no Runoff Volume=8.285 of
'° Runoff Depth=2.87"
Tc=10.0 min
w
CN=78
none mount
®Rwolf

Mt Airy Quarry-riserbasins_revised NOAA24-hrC 10-Year Reima05.18'
At Airy QuarryAserbasimajovlaed NOAA 24-hrC 10-Year Reinfelk5. 18'
Prepared by Mbmsoft PNnled 12MM20
Prepared by Mlcrosoft Printed 12123020
HvdmCA0010.0D2f sla 1024702018 HAMCAD Soffeaie Solutions LLC Pace is
HMmCAM 10.0621 Idn 1024702018FHmCADSofwam SolutionsLLC Pam 16
Summary for Subcatchment da•3: Drainage Area #3
Summary for Pond 31): riser basin #3
Runalf - 66AI cis@ 12.18 hrs, Vohmd� 5.014 a1, Depth- 287'
InlbwAma= 21.000 ac, 0.00% Impavlous, Inflow Depth= 2.87' for ID -Year event
Inflow = 66.41 cls@ 12.18 ho, Volumes 5.014 of
Runoff by SCS TR.20 method,UH=SCS, WeightedCN, Time Span= DOD -120.00 Ns, dt=0.05 his
Oull = 14.12c6@ 12.65hm, Volume, 4.59681, AIten=79%, Lag=28.5min
NOAA244vC 10-Yea Rainfall=5.18'
Primary = 14.12c1s@ 1265hm, Volume= 4.596 e1
Amite) CN Dewiofon
Rou6ngby SWr ndm thod,TmeSpm-0.OD120.ODhm,&0.05hrs
21.000 78
Peak Eler- 1,020.86Q 12.65 hrs SudA3m=34,807sf Sbaaga=1D3,431cf
21,000 1DO.00%Pervbus Area
Plug-Fbwdeknvon*m 1,139.8minmlmlatedbr4.596of(92%of inflow)
To URO Sbpe VdD* Capacity Dewnptbn
Ce Wt f.MassdsL5rm=1,096.2mm(1,928.7-8325)
(mkd (leet) (BM) (Nsec) Me)
10.0 Direct Entry,
Volume Invert Avad.Sbrzme Sbam Descdo5m
#1 1,016.W 3465Md Custom Stage Data(Pdsma0c) Listed below(Recab)
Subcatchment da3: Drainage Area #3
Elevation SurfAma Inc.Sbm Cum.Sbre
°i°ra�rmnl'
(feet) (60-0) (1fmO (ablc4ae0
a n on
1,016.00 5,130 0 0
30- 66.�1w
1.017.00 12,451 8,791 8,791
NOAA 24-hr C
1.018.00 19,773 16,112 24,903
11019.00 25,292 22,533 47,435
an 10-Year Rainfall=5.18"
1.020.00 30.812 28,052 75,487
55 Runoff Area=21.000
1,021.00 35,503 U158 10%&5
so aC
1,02201) 40,194 37.849 146,493
46. Runoff Volume=5.014 of
1,023.00 44.665 4ZS40 189.033
40' Runoff Depth=2.87"
1,024.00 49,576 47,231 236.263
1,025.00 55,130 52,357 2BB,820
u Tc=10.0 min
1,026.00 60,700 57,919 346,539
30-
u. CN=78
Deuce Roiling Invert Ou atDavbes
as
#1 Primary 1,009.07 18.0' Round Culven L=132.0 CMP,squaeedgeheadwa8, 1(e=0.500
Inletl0u0ellnvert-1,009.00'11,DOOAO' S=0.06827 Cr--0.900
r6
n=0.025 Comugaledmebl, FlowArer-1.77sf
so
#2 Device 1,016.00 0.170 cfs Constant FloalSMmmer Phawln=0.3Y
6.
#3 Device) 1,020.0P 24.0'HodLOdOcelGrale C-OSDO Limibdbwetr0awatlowheads
0
o e 10 35 zb as 30 35 40 as so ss flu es ]b ]s w es w 95 is ton +ib 316 3A
emnary OulFlow Mas=14.13cis @12.65 In HW=1,020.86(Free Discharge)
none Inamq
=Culvert (Passes 14.13 cis of 19.32 cis pounded Bow)
2--Constant FIowlSMmmer (ConstantControts 0.17 cb)
3=Ori0celGrale (Orifice Controls 13.96 tits ® 4.44 fps)

Mt Airy
NOAA24hrC 10-YearRaaf18&5.18'
Printed 12R34020
Mt Airy Quarry_daerbasini_revised NOAA24-hrC 10-Year Rainfalk5.18'
Prepared by MicroBo l Printed 120020
HydmCADOMDO Isb1024702018 Hydie0PD Software SOtoinne LLC Paw 18
Pond 3P: riser basin #3
Hyd.o9raph
Summary for Pond riser2: riser basin #2
Inflow Area= 34.700 ac, 0.00% Impervious, Inflow Depth= 2.87' for 10-Yearevent
■imiw. Inflow = 109.74 cbQ 12.18hre, Volume- 8.285 at
Inflow Area=21.000 ac
®rdm.n Ouebw = 9.96ds@ 13.39 hrs, Volume- 6.445af, Atten=91%, La9=72.8mn
Primary = 9.96cfs@ 13.39 hrs, Volume= 6.445 of
Peak Elev=1,020.85'
secondary= 0.00cis ® DOOM, Votome- 0.000at
Storage=103,431 cf
Routing by Stor-Ind method, Time Span= D00120.00 hrs, dt= 0.05 hre
Peak Ear-1,DO8.46'®13.39has SuriAea= 49,999sf Sbmge= 217,466 cf
Plug -('lox detention tine=1.646.2 min calmdabd for 6.445 of VS%of inflow)
Centerai#Wss det. time=1,559A min ( 2,391.8. 832.5 )
Vokpon Insert Ava9.6braoe Storage Description
#1 1,002.00' 418,905d Custom Stage Date(PMrretic) Listed bebw(Recalc)
FJeva§on SarfAea
Inc.Sbr6 Cum.6kae
(1600
(sg-0
(cubic -feet) (cub'o-be0
1,00200
7,460
0 0
1.00100
18,730
13,095 13,095
1,004.00
29,997
24.364 37,459
i'moO
34,825
32.411 69,870
1,OD8.00
39,650
37,238 107.107
1,007.00
43.920
41,785 14BA92
1,008.00
48,190
46,055 194,947
1,OD9.00
5ZI34
50,162 245,109
11010-00
66.078
54.106 299,215
1,011.00
59,845
57,962 357,177
1.012.00
63,612
61,729 418M
Device Routing
Inver!
Outtel Devices
#1 Plinary
995.07
24.0' Round Cuhra t L= 96.0' CMP, square edge headwall. Ile- 0.50D
Inlet/OUVeIImed=995.071990.00 8-0.05217 Co0.900
n=0.025 Canugaad meld, Flow Area- 3.14at
#2 D&AMI
1,00200'
0.34Uds Constant FlowiSOmmer Phase4n=0.3Y
#3 Device
1,OOBDO
36.0'Horz OdOcelGrale C=0.6DO L'enhad to weir now at kw heads
04 Secondary
1,OW.W
25.0'long a 1.00' rise Sharp -Crested Rectangular Weir 21indConexction(s) Ur Cresltisight
primary Ou1Flow Marc=9.91 c(s 1113.39 Ina HW=1,008.4E (Free Discharge)
�-1FL°Calved (Passea9.91 cis of42.02 cis potential fox)
2xonstarlt FlcwiSkimmer (ConstantConbds 0.34 cis)
3-0ri0cdGrate (Weir Controls 9.57 the ®2.21 fps)
onday Outflow Mar=0.00 cis @0.00 hrs HW=1,002.00 (Free Discharge)
ar nZroded Rectangular Weir ( Conroe oft)

Mt Airy Quarry_riserbasins_revised NOAA24-hrC 10-Yw Rainle11-5.18*
Prepared by Micfmft Prnkd 122Y2020
HVMnGD®10.00 21 sfn 10247 02018 H.dMW Smlrma Solutions LLC Pace 19
Pond riser2: riser basin N2
■ imw
Inflow Area=34.700 ac
■P"a
�^ an
Peak Elev=1,008.46'
Storage=217,466 cf
Mt Airy Quarry_dserbesins_revised NOAA24-hrC 1MYeerRainlalk8.03'
Prepared by Wm ft Printed 12/232020
HWroCADO 10.%21 sin 10247 02018 IhdmCAD SOBware SoMims LLC Pane 20
Tma span4.00-120.DD hrs, dt-0.05 ha, 2401 prink
Runoff by SCS TR.20 method, UH=SCS, WeghW.CN
Reach muting by SIcr-Ind.Traos method - Pond rouling by Smr4nd method
Sulmetehmad tla2: Drainage Area 92 RuwffAm".700w 0.00%Impwious RunoffDeAr=5.4T
Tc-IO.Omn CN=78 Ruwff=2D4.58ds 15.669af
SuhcatchmentclO:DlainageAreaa3 RunoffArea=21.000ac 0.OD%I.pervi= RwwfDepth=5A2'
To-10.0 rrn CW78 Runoff=123.81 ds 9.483 of
Pond 31s: deer basin 93 Peak Ebv=1,023.27 Stoaw201,155d Intl s- 3.81 c6s 9.493 al
OulAor=20.49cis 9.060 of
Pond dss2: riser basin 42 Peak Etev-1,009.76 Storage=285,636d inlbe=2M.68 cis iS.669 a1
Prmary=4364ds 12.112al SaroMary=58.45ds 1.707a1 OudM=10209ds 13.818af
Tolai Runoff Area-55.700ac Runoff Volume=25.152 of Average Runoff Depth=5.4T
1D0.0Q%Pervious=55.700ac 0.00%Imparvm=0.000ac

Mt Airy Quarry_dserbasins_revised NOAA24-MC 100-YwRainf&;8..03'
Prepared by Miw ft Primed 12237M
HvdmCADO10.DD-21 stn 10247®2018 HMraCAD Software Sohdiom LLC PM 21
Summary for Subcatchment da-2: Drainage Area #2
Runoff = 204.58 cfs@ 12.17 hm, Volume= 15.669 af, Depth= SAT
Rurmff by SCS TR-20 method, UH=SCS, Yi6ghled-CN, Turre Sperm 0.00.120.0D hrs, dt-0.05 hrs
NOAA24-mC 100-Year ReinfeMD3'
Area CN Descrotion
34.700 100.00 % Pervious Area
To Lao Slope Velocity Capacity Description
(min) (fee0 (M) (tusec) (ch)
10.0 Direct Entry,
Subcatchment da-2: Drainage Area #2
Mt Airy
NOAA244vC 100-Yea•RainfalkS03'
Printed 120 020
Summary for Subcatchment da-3: Drainage Area #3
Runoff = 123.81 cfs @ 12.17 hrs, Volume= 9.483 at, Deem= 5.42'
Runoff by SCS TR-20mamod, UH=SCS, Welghted-CN, Then Span=0.00.120.00 hrs, dt=0.05 his
NOAA24-hrC 100.Yeur Rainlalk8.03'
21.000 78
21.000 100.M Peryo us Atea
To Length Slope Velocity CapadN Description
(min) (1ee0 (tuft) (tusec) (cm)
10.0 Direct Entry,
Subcatchment da-3: Drainage Area #3
220
210
209,SOcfi
z-R-.-
in
tTiOl Cls
2M
NOAA 24-hr C
in
NOAA 24-hr C
;a
100-Year Rainfall=8.03"
110
100-Year Rainfall=8.03"
IN
Runoff Area=34.700 ac
IN
Runoff Area=21.000 Sic
o
Runoff Volume=15.669 of
�°
Runoff Volume=9.483 of
fi ;p
Runoff Depth=5.42"70
6
Runoff Depth=5.42"
;N
Tc=10.0 min
Tc=10.0 min
eacu:
CN=78
so-
CN=78
70
a I'�
0 5 to 15 20 25 30 35 40 IS 50 55 Bd 95 ]0 75 aft BS 60 85 IN 105 110 115 t]0 0 5 10 15 20 15 30 ]5 40 45 0 0 60 65 70
nme pounl nm. noun)
■aumn

Slope Drain Calculations

'�`•
i` hr J �
l
ta.
y i 5S y
� sc
+3lsi - Ja
9` •�aFi H,yn�� .r }.t //"`��`t� ii't's,�'.�ti �l�� �. -] F
A
+ i

12/18/2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: ' Circle v
le
Velocity(V)&Discharge(Q) v
Select unit system: Feet(ft) v
Channel slope: .4375 Iftift
Flow veloci 21.0427 ft/s
low discfiargel 13.8318 ft^3/s
Water depth(y): .66 ft
LeftSlope (Z1): to 1 (H:V)
Input n valu 0.022 or select r
Radius (r) 625 ft
RightSlope (Z2):
Calculate!
Status:
Calculation finished
Reset
etted perhnete 2.03
ft
Flow area 0.66 ft^2
Froude mm�be 5.11
Critical slope 0.1192 ft/ft
Top width(T)
1.25�
Specific energy 7.54
Critical depth 1.23 ft
�J
Flow statu Supercritical flow -�
Velocity head 6.88
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering, Lamar University.
S 1) 1 q
https://www.eng.aubum.edu/—xzf0001/Handbook/Channels.htmi
1/1

12/17/2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Circle v
e
Velocity(V)&Discharge(Q) v
Select unit system: Feet(ft) v
Channel slope:- .34
IWater depth(y): ,66 ft
Radius (r)
75 ft
Flow veloci t9.4i ft/s
LeftSlope (Z1): to 1 (H:V)
KightSlope (Z2):
to 1 (H:V)
Flow discharge 14.5291
ft^3/s
Input n valu 0.022
or select
n
Calculate!
Status:
Calculation finished
Reset
Wetted perimete
2.18
ft
Flow area
0.75 ft^2
Top width(T)
1.49 ft
Specific energy
6,5
ftO
Froude numbe 4.82
Flow statu Supercritical flow
Velocity head 5.84
Critical depth 1.4 ®
I
lCritical slope 0.0474 ft/ft
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering, Lamar University.
5ID qq
hilpsJ/www.eng.auburn.edu/—xzf0001/HandbooPJChannels.htmi 1�1

12/17/2020 "
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Circle v
Sclect unit system: Feet(ft) v
e
Velocity(V)&Discharge(Q) v'i
Channel slope:.37
ft/k
Water depth(y):
.42 k
Radius (r) 5 fi
Flow velocity 15.0637 kJs
LeftSlope (Zl): to-1 (H:V)j
I RightSlope (Z2):
Flow discharge 4.7156
k^3Js
Input n valu
0.022
orselectr
Calculate!
IStatus:1
Calculation finished
Reset
Wetted perimete
1.41
ft
Flow area
Top width(T)
0.31 ft^2
0.99 lift
Specific energy 3.977777
Froude nttmbe 4.71
Flow statu Supercritical flow
Critical depth 0.9
Critical slope
o.O441 ft/ft
Velocity head 3.52
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering, Lamar University.
S_SD yb
htlps://w .eng.aubum.edu/—xzf0001/Handbook]Channels.htmi 1/1

12/21 /2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Circle v
ig
Velocity(V)&Discharge(Q) v
Select unit system: Feet(ft) v
Channel slope:.48
Ifivit
Water depth(y):.53 Ift
Radius (r) .5 ft
Flow veloci 16.7405 ltVs
Flow discharge 7.0759 ft^3/s
LeftSlope (ZI): Ito 1 (H:V)
Input n valu 0.025 or select r
RightSlope (Z2): to 1 (H:V)
Calculate!
Status: Calculation finished
Flow area 0.42 ft^2
Reset
Wetted perimete
1.63
ft
Lop.width(T) 1
ft
Specific energy 4.88—J
Critical depth 0.98
Froude numbe 4.53
Critical slope 0.1297 ft/ft
Flow statu Supercritical flow
Velocity head 4.35 =
Copyright 2000 Dr. Ring Fang, Department of Civil Engineering, Lamar University.
SD 5A
htips://wvAv.eng.aubum.edu/-xzf0001/Handbook/Channels.html
1I1

12/21/2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Circle v
i
Velocity(V)&Discharge(Q) v
Select unit system: Feet(ft) v
Channel slope:.47 ft/ft
Water depth(y): .56 ft Radius (r)
LeftSlope (Z1): to 1 (H:V) RightSlope (Z2):
Input n valu 0.022 or select r corrugated metal pipe:0.022
.625 ft
v
Flow velocity
20.3097 fUs
Flow discharge 10.8147 f4A3/s
Calculate!
Status: Calculation finished
Reset
Wetted perimete
1.63
11ft
Flow area 0.53 ft^2
Froude nutnbe 5.47
Top widtll(T)
1.24 IL"—J
Specific energy 6.97 L"—J
Flow staWqSercdtical flow
Critical depth 1.2I
0JjCritical
slope 0.07 IftIft
IVelocity head
Copyright 2000 Dr. Xing tang, Department of Civil Engineering, Lamar University.
htlps;//www.eng.aubum.edu/-x f0001/Handbook/Channels.html
1!1

12/21/2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: , Circle v
ie
Velocity(V)&Discharge(Q) v
Select unit system: Feet(ft) v
Channel slope:
.47 fUft
Water depth(y):.53 ft
Radius (r)
5 ft
Flow veloci 16.5 552 ft(s
Flow discharge 7.0018 ft^3/S
LeftSlope (Z1): to 1 (H:V)
Input n valu 0.025 orselectr
I ightSlope (Z2): to 1 (H:V)
Calculate!
Status: Calculation finished
Reset
Wetted perimete 1,63
ft
Flow area 0.42 ft^2
Froude numbe 4.49
Critical slope 0.127 ft/ft
Top width(T) 1
ft
Specific energy 4.79 L—J
Flow statu SupercNtical flow
Velocity head 4.26 Ift
Critical depth 0.98 Ift
l�
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering, Lamar University.
S-D5c-
htlpsJ/w.eng.aubum,edu/—xzf0001/HandbooktChannels.htmi
1!1

12/21/2020 Open Channel Flow Calculator
Copyright 2000 Dr. Ring Fang, Department of Civil Engineering, Lamar University.
5D eA
hilps://www.eng.auburn.edut—xzf0001/Handbook/Channels.htmi
1/1

Ditch Calculations

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12/18/2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
e
9
Velocity(V)BDischarge(Q) v
Sclect unit system: Feet(ft)
Channel slope:
.097 ft/ft
Water depth(y):
.23 ft
Bottom width(b)
112 Ift
Flow veloci 5.8819
fUs
Le$Slope (Z1): 13 1 to 1 (H:V)
Input n value 0.025 orselectr
RightSlope (Z2): 3
Flow discharge 3.6391 ft^3/s
Calculate!
Status:
Calculation finished
Reset
Wetted perimete
3.45
ft
Flow area
0.62
IftA2771Top
width(T) 3.38
ft
Specific energy 0.77
0
Froude nwnbe 2.42
IFlow statu4
supercritical flow
Critical depth 0.38
I
lCritical slope
0.0144 ft/ft
Velocity head
0.54
Copyright 2000 De Xing Fang, Department of Civil Engineering, Lamar University.
`/1C�'
https.,//www.eng.aubum.edu/—xzf0001/Handbook/Channels.htmi 1l1

12/18/2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
unit system; Feet(ft)
e
r
Velocity(V)BDischargep y
Channel slope:.02
Ilwater
depth(y):
1.44
ft
Bottom width(b)
6 ft
Flow veloci
4.3067 ft/s
LeftSlope (ZI): 33
to 1 (H:V)
I RightSlope (Z2):13 Ito
1 (H:V)
Flow dischargel
13.8711 ft^3/s
I
Input n valu 0.025 I orselect r
Calculate!
IStatus:1
Calculation finished
I JER—es—et]
Wetted perimete 8.78
O
Flow area
I ITop width(T)
8.64 ft
3.22 I ft^2
Specific energy 0.73 ®
Froude number 1.24
JIFlow state Supercritical flow
Critical depth
Critical slope
0.0124
ft/8
Velocity head 0.29
ft
0.5 0
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering, Lamar University.
b
https://www.eng.aubum.edu/—xzf0001/HandbookIChannels.html 1/1

12/11812020 U Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: TrapezoidFIFi
Select unit system: Feet(ft)
e
-m-
Velocity(V)&Discharge(Q)
Channel slope: .085 fVft
Flow velocity 6.3189 ft/s
Flow discharge 7.8532 IftA3=
Water depth(y): ., 3 ft
Le$Slope (Z1): to 1 (H:V)
Input n valu 0.025 or select r
Bottom width(b) 4 ft
RightSlope(H:V)
Calculate!
Wetted perimete 5.64 ft
Status: Calculation finished
Flow area
Reset
ITop width(T) 5.56 ft
Specific energy 0.88 L"�
Froude nwnbe
2.36
Flow statu
Supercritical flow
Critical depth
0.44
Critical slope 0.0132 ft/ft
Velocity head 0.62 _
O
Copyright 2000 Dr. Ring Fang, Department of Civil Engineering, Lamar University.
c-
htips://www.eng.auburn.edu/-xzf0001/HandbooktChannels.html 1/1

12/17/2020 Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
Sclect unit system: Feet(ft) v
e
Velocity(V)&Discharge(Q)
Channel slope:
.068 fUft
Water depth(y):.26
ft
Bottom width(b)
2 ft
low veloci
5.2714 ft/s
LeftSlope (Z1):
0
to 1 {H:V)
RightSlope (Z2):1�
to 1 (H:V)
low discharge
Input n valu 0.025 laselect r
3.8102 ft^3/s
Reset
Calculate!
Status:
Calculation finished
Wetted perimet 3.64
ft
Flow area 0.72 1ft^2I
ITop width(T)
3.56
ft
Specific energy 0.69 0
Critical depth 0.4
Froude numbe 2.06
Critical slope 0.0141 ft/k
Flow state Supercritical flow
Velocity head 0.43
Copyright 2000 Dr. Ding Fang, Department of Civil Engineering, Lamar University.
-D3c,,
https:ihvww.eng.auburn.edu/-xzf0001tHandbook/Channals.htmi 1/1

12117/2020
Open Channel Flow Calculator
_
The open channel flow calculator
Select Channel Type: Trapezoid v
Is
Velocity(V)&Discharge(Q) v
Select unit system: Feet(k) v
Channel slope:.058 ft/k
Water depth(y):
.35
ft
Bottom width(b) 4
ft
Flow velo - city6.1916 ftls
Flow dischargel 10.9437 ft^3/s
Calculate!
LeftSlope (Z 1): 3 to 1 (H:V)
Input n valu 0.025 or select n
Status: Calculation finished
RightSlope (Z2): L—J to 1 (H:V)
Reset
Wetted perimete
Flow areal
1.77 Ift.
Top width(T)
6.1
6.21
k
Specific ener O.g5
Froude numbe 2.03
Flow statu
supercritical flow
I Velocity head
Critical depth 0.54 ft
IlCritical slope
E.012
0.6
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering. Lamar University.
1)Lk0"
hitps://www.eng.aubum.edu/-xzf0001/HandbookIChannels.htmi 1/1

12/17/2020 Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: I Trapezoid v
Select unit system: Feet(ft)
6
Velocity(V)&Discharge(Q)
Water depth(y):.25 ft
ILefiSlope (Z1): 0 to 1 (H:V)
Input n valu 0.025 or select n
Bottom width(b) 2 ft
]ZightSlope (Z2): �— to 1 (H:V)
Channel slope: .085 ft/ft
Flow veloci 5.7671 ft/s
Flow discharge
3.9649
ft^3/s
Calculate!
Status:
JIF
Reset
Calculation finished
Wetted perfineteiE.58
Flow area
0.69
jftA2
Top width(T) 3.5 ft
Specific energy 0.77 0
Froude numbe 2.29
Flow statu Supercritical flow
Critical depth
0.4
O
Critical slope
0.014 ft/ft
Velocity head 0.52
O
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering, Launar University.
17. LAb
hops://w .eng.aubum.edu/—zzf0001/Handbook/Channels.htmi 1/1

12/17/2020 Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
Select unit system: Feet(ft) v
9
Velocity(V)BDischarge(Q) v
Channel slope: .0733
ft/ft
Water depth(y):.3 ft
Bottom width(b)
2 ft
Flow veloci
5.9219 ft/s
LeftSlope (ZI):
Ito 1 (H:V)
Flow discharge
5.1521
ft^3/s
Input n valu
0.025
or select r
Status:
Reset
Calculate!
Calculation finished
Wetted perimete
Flow area
0.87
ft^2
Top width(T)
3.8
ft
3.9
ft
Specific energy 0.84 t `
Froude numbe 2.18
Critical slope .0136 ftlft
0
jFlow state Supercritical flow
Velocity head 0.54
Critical depth o.47
0
Copyright 2000 Dr. Xing Fang, Department of Civil Engineering, Lamar University.
1D L\ c--
https://www.eng.aubum.odu/-xzf0001/HandbookJChannets.html �/�

•, .
12/21/2020
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
TF
is
unit system: Feet(ft)
Velocity(V)&Discharge(Q) IFSelect
Channel slope:
.054
ft/ft
Water depth(y):
.24 ft
Bottom W(b)
2
ft
RightSlope (Z2):
Flow velocity
5.1055 ftls
L lope (Z1):
3
Flow discharge 3.3335 ft^3/s
Input n valu
0.022
or select r corrugated metal pipe:O.O22 v
Calculate!
Status:
Calculation finished
Reset
Wetted perimete 3.52 ft
Flow area 0.65 ft^2
Top width(T)
3.44
I Ift
Specific energy 0.64 ftO
Critical depth 0.37 0
Froude nutnbe 2.07
Critical slope 0.0113 ft/ft
IFlow status Supercritical flow
lVelocity head 0.4 �J
Copyright 2000 Dr. Xing Tang, Department of Civil Engineering, Lamar University.
D S (Al
https://www.eng.aubum.edu/—xzt0001/Handb0ok/Channels.htmi 1M

12/2112020 Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
Select unit system: Feet(ft)
e
Velocity(VADischarge(Q)
Channel slope:
.015 tuft
Water depth(y):
.4 ft
Bottom width(b)
4 ft
Flow veloci 3.3955
ft/s
LeftSlope (Z1): to 1 (H:V)
Input n valu 0.025 or select r
RightSlope to 1 (H:V)
Flow discharge 7.0626 ft^3/s
Calculate!
Status: Calculation finished 7-7[ERI
Wetted perimete
1 ITop width(T)
6.4
ft
6.53
Specific energyFo-5-8--7
I lFroude nwnbe
1.05
Flow state Supercritical Flow
Critical depth 0.41
®
lCritical slope
0.0133
ft/ft
Velocity head
0.18
ft
Copyright 2000 Dr. Xing rang, Department of Civil Engineering, Lamar University.
-0Sb
https://www.eng.aubum.edu/-xzf0001/Handbook/Channels.htmi 1/1

1202020 Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
e
Velocity(V)&Discharge(Q)
Select unit system: Feet(ft)
Channel slope: .232 ff/ft
Water depth(y): 1.16 lit
I
Bottom width(b)
2 ft
Flow veloci 7.4127 ft!s
LeftSlope (ZI): 0 to 1 (H:V)
Input n valu 0.025 or select r
ltightSlope (Z2): F3 to 1 (H:V)
Flow discharge
2.9413
ft^3/s
Calculate!
Status:
Reset
Calculation finished
Wetted perimete 3.01
ft
Flow area
0.4
I Top width(T) 2.,
ft
Specific energy 1.01 lift
lFroude ntunbe 3.57
Flow statu Supercritical flow
lVelocity head 0.85 0
Critical depth
0,34
E=
Critical slope
0.0149 Ifuit
Copyright 2000 Dr. Xing pang, Department of Civil Engineering, Lamar University.
-1�� �0 (.\
httpsJ/www.eng.aubum.edu/-xzf0001/HandbooktChannels.htmi 1�1

12/21/2020 I , 7.,
Open Channel Flow Calculator
Copyright 2000 De Xing Fang, Department of Civil Engineering, Lamar University.
))106
hilps://www.eng.aubum.edut—xz(0001/Handbook/Channels.htmi
1/1

12/21/2020 ' "
Open Channel Flow Calculator
The open channel flow calculator
Select Channel Type: Trapezoid v
is
Velocity(V)&Discharge(Q) v
Select unit system: Feet(ft) v
Channel slope:
.04 ft/ft
Water depth(y): .2 Ift
Ift
Flow velocity 3.493 ft/s
LeftSlope (Z1): 3
to 1 (H:V)
RightSlope (Z2): 3 Ito 1 (H:V)
Flow discharge 1.8164
ft^3/s
Input n valu
0.025
or select
r
Calculate!
Status: Calculation finished
Reset
Wetted perimete 3.26 lift
I I
Flow area 0.52 IftA2
Top width(T)
3.2
ft
Specific energy 0.39 I.`�
Froude numbe 1.53
Flow statuSupercritical flow
Critical depth 0.26
lift
Critical slope 0.016
ft/ft
I
Velocity hea 0.19 fft---1
Copyright 2000 Dr. Ring rang, Department of Civil Engineering, Lamar University.
https://www.eng.aubum-edu/—xzfOOOI/Handbook/Channels.html
1/1

Miscellaneous

-,may , �y�F„ y� F �..
{.;

Skimmer(
TM O,P. a --
ONLINE CALCULATORS
CONTACT US
L SKIMMER SIZING ;` rEc SKiNr.=;,j�r,
® CALCULATE FAIRCLOTH SKIMMER@ SIZE
Basic volume in cubic feet
14040
Volume Is the actual or provided volume the you intend to drain,
usually not the required volume which is often smaller. If a pool
of water is to be maintained between storms, do not include that
volume. In some cases a sediment basin may be larger than
required because it will be used as a permanent stormwater
pond.
Home Skimmer Sizing
Days to Drain
2
Number of Days to drain Is usually determined
by local or state regulations. Where there is no
requirement 3 days is recommended. Keep in
mind the quicker the basin is to drain the larger
the skimmer required. In NC, assume 3 days to
drain.

,-= BASIN VOLUME CALCULATOR
If you do not know the basin's volume but you do know the dimensions and depth of a square or
rectangular basin, use this calculator to estimate the volume.
Length Width
Top of water surface in feet
Bottom dimensions in feet
Depth in feet
IMPORTANT!
The calculator does not take into consideration Common Sense. For example, if the volume
entered is even one cubic foot greater that the maximum calculated capacity of a skimmer the
next larger size will be given as the answer.
In reality, a reasonable judgment would be that the smaller size is adequate given the room for
error in the assumptions that go along with the design and sizing process.
For example: using the entire volume of the basin to determine the skimmer size assumes that
the basin fills during every rain event, which is usually not the case (therefore, the basin will
drain somewhat quicker); it also assumes inflow to the basin stops when the basin is full,
which may not be the case (inflow may continue, lengthening the drain time); or another rain
event may occur before the basin drains.
Therefore it is recommended that the following flow capacities chart be used together
with the calculator.

e
AIMMM
Skimmer size
24 hours
2 day
3 day
4 day
5 day
6 day
7 day
1.5" 2" 2.5" 3„ 4" 51, 6" 81.
1,728 3,283 6,234 9,774 20,109 32,832 51,840 97,978
3,456 6,566 12,468 19,548 40,218 65,664 103,680 195,956
5,184 9,849 18,702 29,322 60,327 98,496 155,520 293,934
6,912 13,132 24,936 39,096 80,436 131,328 207,360 391,912
8,640 16,415 31,170 48,870 100,S45 164,160 259,200 489,890
10,368 19,698 37,404 58,644 120,654 196,992 311,040 587,868
12,096 22,981 43,638 68,418 140,763 229,824 362,880 685,846
& TECHNICAL SIZING INSTRUCTIONS
Determining the Skimmer Size and the Required Orifice for the Faircloth Skimmer® Surface Drain (click here to open
document)
DETERMINING SKIMMER SIZE
• Eight sizes available, ranging from 1 Yz" for small sediment traps to 8" for very large basins.
• Size refers to the maximum diameter of the inlet. For example, a 4" Faircloth Skimmero has a
4" maximum orifice size.
• Each Faircloth Skimmer® includes a plugand adjustable cutterfor making an orifice (hole)
smaller than the inlet to customize the flow rate for the particular basin.
METHOD USED
The flow rates used in the calculator and listed in the chart are theoretical rates calculated using
the orifice equation and the head on the inlet for each size skimmer. (Note that the head is
different for each size skimmer.)
Also, the head may vary slightly when the skimmer is in use, plus or minus, depending upon the
depth of water and the position of the skimmer. The actual flow rate for the installed skimmer may
be slightly less than calculated, especially when the barrel has a flat or low slope.
Any variation in flow rate is considered insignificant enough to appreciably affect the drain time
considering the number of variables involved. Therefore, the theoretical rates are used to simplify
the orifice sizing process.

Skimmer
Post Office Box 789
Hillsborough, North
""j. Faircloci, 3 Sosi, inc. is deci: Carolina 27278
919-732-1244
ei>
919-732-1266
oTpop
BW
R. tiny: A.
Skimmer

www.mve.noaa.gov
.rlorr
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i
n Q Go
NOAA ATLAS 14 POINT PRECIPITATION FREQUENCY ESTIMATES: NC
Data description
Datatype: Precipitation depth Units: English Tlmesedestype: Panialdura6on
Select location
1) Manually:
-- a) By location (decimal degrees, use "for Sand W): Latitude: O LonglWde:� Submit
b) By station (list of NC stations): Select station
a - c) By address Search Q
2) Use map (If ESRI Interactive map Is not loading, try adding the host hftps:/4sAmgls.wm/ to the grewall, or contact us at hdsc.questions®rloamgm):
a) Select location
ID Terrain 'd r Move aosshalr or double dick
- _ b) Cilek on station icon
Laabshur0 Clauavllle O Show stations on map
—.-.,,,r; Ica
F
z —
v, Location information:
b "q Name: Mount Airy, North Carolina,
ItSA;yoV_. Loweap USA,
o - LatiWde: 36.4896-
lei _ de'4+' Longitude:-W.6112'
(MIAIry a_ e,f Elevation: 1062.86 it
Westfield
I )� _ � C4�•eL S _
Ararata`s `
f vnr,,vo Dobson C1 ...
., �•` pilot 8
Mounts n
' Source: ESRI Maps
"Source: USas
POINT PRECIPITATION FREQUENCY (PF) ESTIMATES
WTTH 90%CONFIDENCE INTERVALS AND SUPPLEMENTARY INFORMATION
NOAA Atlas 14, Volume 2, Version 3
PF tabular .. -
PDS-t]ased precipkation frequency estimates With!
o1OBtl0"
w� Avere.". fib
�i
z
�f
s
OC
0.34fi
VA17
a"0.46
s
0.61fi
5min
(0.320-0$77) 11
(0.3111.0A50)
(0.451.0.535)
(0.501-0.595)
10m1n
(0.511-0.601)
(0.609-0.720)
(0.723.0.857)
(0.902.0.952)
(0: w.07)
(0.
0.691
t6nwl
(0.8330152)
(0.766-0.905)
(0.91�A8)
(1.01120)
(1.11.36)
(1
(OR7S1.031
(1.08.125)
(1.30-1. 1)
(1A78.74)
(1.6&201)
(1,
lie
1A4
D.09.129)
<t.331.5T)
(1.87-81'97)(222AS88)
2-M1r
1.41
(1.3b154J
1.72
(1.531.88)
2.-2.
(201.239)
(232278)
7.-3
(2]4-3.32)
(3.
C
1.53
(1.41-1.67)
1A7
(1.72-205)
237
(2.16_ .
278
(2.52-3.02)
(28&3.80)
��
(3.
1".Z
(1.7/-209j
(216.254)
21M
(271321)
3A2
(3.133.]9)
4.09 )
(372i.47
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HomoI OWP
us Deaadmenml Cemmmw
National Omnk 8W At $PtWrk AEministiatien
Nalimal Weather Semk
O of Winer Preditlbn pmW
1025 East West HlgM y
silver SON. MD 20010
Page Aa.. HDSC mbmaster
Page WW MW&d :APN 21, 2017
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Credits
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Cweer OpDonurdties