SW6210906_Design Calculations (Riprap)_20211014

OUTLET PROTECTION DATEDESIGN PHASE
DESIGN 7-21-21PRELIM/ /
PROJECT NAMEPROJECT NOCONSTR/ X /
Brooke Valley Subdivision1781REVISION/ /
LOCATIONBYRECORD/ /
Hoke County, North CarolinaCEKOTHER/ /
CHECKED BY(SPECIFY)
CSB
Storm Outlet Structure
10/Qfull =
FES No.=FES-2Q0.71
Pipe Dia=18 inV/Vfull = 1.08
Q
10=4.37 cfsV =3.8fps
Qfull =6.16 cfs
Vfull = 3.48 fps
From Fig. 8.06.b.1:Zone=2
D 50
From Fig. 8.06.b.2:=8 in
D MAX
=12 in
Riprap Class=B
Apron Thickness=18 in
Apron Length=9.0 ft
Apron Width @ Outlet=4.5 ft
Apron Width @ End=10.5 ft
Storm Outlet Structure
FES No.=FES-4Q 10/Qfull =0.30
Pipe Dia=18 inV/Vfull = 0.87
Q 10=4.24 cfsV =6.9fps
Qfull =13.90 cfs
Vfull =7.85 fps
From Fig. 8.06.b.1:Zone=2
From Fig. 8.06.b.2:D 50=8 in
D MAX=12 in
Riprap Class=B
Apron Thickness=18 in
Apron Length=9.0 ft
Apron Width @ Outlet=4.5 ft
Apron Width @ End=10.5 ft
1781-Storm Drainage for Spread.xlsLATEST REVISION: 10/14/2021 1:28 PMPAGE 1 OF 3

OUTLET PROTECTION DATEDESIGN PHASE
DESIGN 7-21-21PRELIM/ /
PROJECT NAMEPROJECT NOCONSTR/ X /
Brooke Valley Subdivision1781REVISION/ /
LOCATIONBYRECORD/ /
Hoke County, North CarolinaCEKOTHER/ /
CHECKED BY(SPECIFY)
CSB
Storm Outlet Structure
Q 10/Qfull =0.62
FES No.=FES-6
Pipe Dia=18 inV/Vfull = 1.05
Q 10=7.56 cfsV =7.2fps
Qfull =12.18 cfs
Vfull = 6.88 fps
From Fig. 8.06.b.1:Zone=2
From Fig. 8.06.b.2:D 50=8 in
D MAX=12 in
Riprap Class=B
Apron Thickness=18 in
Apron Length=9.0 ft
Apron Width @ Outlet=4.5 ft
Apron Width @ End=10.5 ft
Storm Outlet Structure
10/Qfull =
FES No.=FES-8Q0.26
Pipe Dia=18 inV/Vfull = 0.83
Q 10=
7.93 cfsV =14.5fps
Qfull =30.90 cfs
Vfull =17.46 fps
From Fig. 8.06.b.1:Zone=2
50
From Fig. 8.06.b.2:D=8 in
D MAX
=12 in
Riprap Class=B
Apron Thickness=18 in
Apron Length=9.0 ft
Apron Width @ Outlet=4.5 ft
Apron Width @ End=10.5 ft
1781-Storm Drainage for Spread.xlsLATEST REVISION: 10/14/2021 1:28 PMPAGE 2 OF 3

OUTLET PROTECTION DATEDESIGN PHASE
DESIGN 7-21-21PRELIM/ /
PROJECT NAMEPROJECT NOCONSTR/ X /
Brooke Valley Subdivision1781REVISION/ /
LOCATIONBYRECORD/ /
Hoke County, North CarolinaCEKOTHER/ /
CHECKED BY(SPECIFY)
CSB
Storm Outlet Structure
FES No.=SKIMMERQ 10/Qfull =1.00
Pipe Dia=2 inV/Vfull = 1.14
Q 10=0.07 cfsV =3.7fps
Qfull =0.07 cfs
Vfull = 3.21 fps
From Fig. 8.06.b.1:Zone=1
From Fig. 8.06.b.2:D 50=4 in
D MAX=6 in
Riprap Class=A
Apron Thickness=9 in
Apron Length=0.7 ft
Apron Width @ Outlet=0.5 ft
Apron Width @ End=0.8 ft
1781-Storm Drainage for Spread.xlsLATEST REVISION: 10/14/2021 1:28 PMPAGE 3 OF 3