SW6210906_Design Calculations (Storm Drains)_20211014

STORM DRAINAGE / HYDRAULIC GRADE LINE DATEDESIGN PHASE
ANALYSIS (10 YEAR)7-21-21PRELIM/ /
PROJECT NAMEPROJECT NOCONSTR/ X /
Brooke Valley Subdivision1781REVISION/ /
LOCATIONBYRECORD/ /
Hoke County, North CarolinaCEKOTHER/ /
CHECKED BY(SPECIFY)
CSB
n=0.013STORM DRAINAGE SCHEDULECONTINUED
g=226
h=26
INLETQ (+)Q(-)CAPTUREDTcICc
INLETCcINLETUPSTREAMINLET INLETTOTALINLETPIPETIMERUNOFF
FROMTOAREASAREARUNOFFDISCHARGEBYPASSBYPASSDISCHARGEAREASTIMETIMEOF CONC.INTENSITYCOEFF.
(INLETS)(AC)COEFF.(CFS)(CFS)(CFS)(CFS)(AC)(MIN)(MIN)(MIN)(IN/HR)
CI-1CI-9CI-11.200.401.920.000.451.471.205.000.005.007.290.40
CI-9FES-2CI-90.140.850.490.000.050.441.345.000.135.137.260.45
CI-3FES-4CI-30.830.702.370.050.002.370.835.000.005.007.290.70
CI-5FES-6CI-51.730.604.600.450.004.601.735.000.005.007.290.60
CI-7FES-8CI-72.420.454.350.000.004.352.425.000.005.007.290.45
Page 1 of 4
1781-Storm Drainage for Spread.xls 10-YEARDate: 10/14/2021 Time: 1:28 PM

STORM DRAINAGE / HYDRAULIC GRADE LINE DATEDESIGN PHASE
ANALYSIS (10 YEAR)7-21-21PRELIM/ /
PROJECT NAMEPROJECT NOCONSTR/ X /
Brooke Valley Subdivision1781REVISION/ /
LOCATIONBYRECORD/ /
Hoke County, North CarolinaCEKOTHER/ /
CHECKED BY(SPECIFY)
CSB
n=0.013STORM DRAINAGE SCHEDULE - CONTINUED
g=226
h=26
QQUPSTREAM
SIDE-CAPACITYSEGMENTUPPERLOWERTOP
FROMTODISCHARGESTREAMSLOPEDIA.(FULL)V FULLLENGTHTIMEINV.INV.ELEV.
(CFS)(CFS)(IN)(CFS)(FPS)(FT)(MIN)(FT)(FT)(FT)
CI-1CI-93.500.000.0033186.03.4260.13173.50173.41176.92
CI-9FES-24.370.000.0034186.23.5320.15173.41173.30176.92
CI-3FES-44.240.000.01751813.97.9320.07162.66162.10166.42
CI-5FES-67.560.000.01341812.26.9320.08162.93162.50166.69
CI-7FES-87.930.000.08651830.917.5460.04159.73155.75165.48
Page 2 of 4
1781-Storm Drainage for Spread.xls 10-YEARDate: 10/14/2021 Time: 1:28 PM

STORM DRAINAGE / HYDRAULIC GRADE LINE DATEDESIGN PHASE
ANALYSIS (10 YEAR)7-21-21PRELIM/ /
PROJECT NAMEPROJECT NOCONSTR/ X /
Brooke Valley Subdivision1781REVISION/ /
LOCATIONBYRECORD/ /
Hoke County, North CarolinaCEKOTHER/ /
CHECKED BY(SPECIFY)
CSB
n=0.013HYDRAULIC GRADE LINECONTINUED
g=226BEND LOSSK'S
h=2690 DEG=0.730 DEG=0.28
60 DEG=0.5515 DEG=0.10
PIPEHYDRAULICSIDESTREAMHEAD LOSSBENDFRICTIONFRICTION
FROMTOAREARADIUSSUMMATIONHfHcHeHbHtLOSSSLOPEVELOCITY
(FT)(FT)(CFS)K(FT/FT)(FPS)
CI-1CI-91.76710.37500.000.030.020.020.010.070.100.00111.97
CI-9FES-21.76710.37500.000.060.020.030.010.120.100.00172.46
CI-3FES-41.76710.37500.000.050.020.030.010.110.100.00162.39
CI-5FES-61.76710.37500.000.160.070.100.030.360.100.00524.26
CI-7FES-81.76710.37500.000.260.080.110.030.480.100.00574.47
Page 3 of 4
1781-Storm Drainage for Spread.xls 10-YEARDate: 10/14/2021 Time: 1:28 PM

STORM DRAINAGE / HYDRAULIC GRADE LINE DATEDESIGN PHASE
ANALYSIS (10 YEAR)7-21-21PRELIM/ /
PROJECT NAMEPROJECT NOCONSTR/ X /
Brooke Valley Subdivision1781REVISION/ /
LOCATIONBYRECORD/ /
Hoke County, North CarolinaCEKOTHER/ /
CHECKED BY(SPECIFY)
CSB
DESIGN CRITERIA:
n=0.013HYDRAULIC GRADE LINE - CONTINUED1. DESIGN FOR THE 10 YR STORM
g=2262. ASSUME TIME OF CONCENTRATION TO
h=26 AN INDIVIDUAL INLET = 5 MIN. (Unless otherwise noted)
INLET W.S. ELEV.3. INTENSITY = g/(h+T), FOR 10 YR STORM
OUTLETOUTLETINLETUSEFLOWFREE- (g and h were derived from Raleigh-Durham Intensity-
FROMTOW.S. ELEVCONTOLCONTROLCONDITIONBOARDCOMMENTS Duration-Frequency Charts, REF: NC Erosion and
(FT)(FT)(FT)(FT)CONTROL(FT) Sediment Control Planning and Design Manual)
4. MANNINGS "n" FACTOR= 0.013
CI-1CI-9174.62174.69174.42174.69OUTLET2.23 OK
CI-9FES-2174.50174.62174.42174.62OUTLET2.30 OK
DITCH INV173.30
CI-3FES-4163.30163.41163.66163.66INLET2.76 OK
DITCH INV162.10
CI-5FES-6163.70164.06164.47164.47INLET2.22 OK
DITCH INV162.50
CI-7FES-8156.95157.43161.35161.35INLET4.13 OK
DITCH INV155.75
Page 4 of 4
1781-Storm Drainage for Spread.xls 10-YEARDate: 10/14/2021 Time: 1:28 PM