SW6210302_Calcs (Riprap)_20210323

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Project Name Riprap Dissipator #1 Date
Maxwell Ridge Jul, 2020
DD Project No.
Location Double D Engineering, PLLC DD2010
Hoke County, North Carolina 110 Commerce Avenue Calculated By
Southern Pines, NC 28387 JLH
[phone] Checked By
JLH
STORM DESIGN: 10 Year
BACKGROUND: Use the E&S Control Planning & Design Manual, Section 8.06
REFERENCE: (NCDEHNR, 1993)
Step 1. Minimum Tailwater Condition
Step 2.
Step 3
Step 4.
Step 5.
D-o =
24 in.
Pipe diameter in inches
D-o =
2.00 ft.
Pipe diameter in feet
Q-25 =
13.50 dfs
Pipe outlet (from drainage calculations)
d-50 =
0.4 ft.
from Figure 8.06 a
L-a =
12 ft.
from Figure 8.06 a
3*D-o = 6.00 ft.
W = 14.00 ft.
d-max 0.60 ft
d-max 7 in.
Thickness = 0.90 ft.
Thickness = 11 in.
DESIGN DIMENSIONS:
3 times the outlet pipe diameter
Pipe diameter + Apron length
Maximum Stone Diameter (1.5*d-50) in inches
Maximum Stone Diameter (1.5*d-50) in feet
Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet
Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches
Apron Dimensions Riprap
LengM Width 3-D-o Thick Class
12 14 6 24in. 1
INOLOGY: Q10 = 10-Year Design Storm, Peak Discharge, (cfs)
D-o = Pipe Diameter, (in. & ft.)
d-50 = Mean Stone Diameter of Rip -Rap, (ft.)
L-a = Length of Rip -Rap Apron, (ft.)
3*D-o = Width of Rip -Rap Apron @ Pipe Outlet, (ft.)
W = Width of Rip -Rap Apron @ End of Apron, (ft.)
d-max = Maximum Stone Diameter of Rip -Rap, (ft. & in.)
Thickness = Thickness of Rip -Rap Apron With Filter Fabric, (ft. Mn.)

Project Name Riprap Dissipator #2 Date
Maxwell Ridge Feb, 2021
DID Project No.
Location Double D Engineering, PLLC DD2010
Hoke County, North Carolina 110 Commerce Avenue Calculated By
Southern Pines, NC 28387 JLH
[phone] Checked By
JLH
STORM DESIGN: 10 Year
BACKGROUND: Use the E&S Control Planning & Design Manual, Section 8.06
REFERENCE: (NCDENNR, 1993)
Step 1. Minimum Tailwater Condition
Step 2. D-o =
15 in.
D-o =
1.25 ft.
Q-25 =
13.50 cfs
d-50 =
0.3 ft.
L-a =
9 ft.
Step 3.
3*D-o =
3.75 ft.
W =
10.25 ft.
Step 4.
d-max
0.45 ft.
d-max
5 in.
Step 5.
Thickness =
0.68 ft.
Thickness =
8 in.
DESIGN DIMENSIONS:
Pipe diameter in inches
Pipe diameter in feet
Pipe outlet (from drainage calculations)
from Figure 8.06 a
from Figure 8.06 a
3 times the outlet pipe diameter
Pipe diameter + Apron length
Maximum Stone Diameter (1.5*d-50) in inches
Maximum Stone Diameter (1.5*d-50) in feet
Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet
Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches
Apron Dimensions
Rlprap
Class
Length
Width
3-D-o Thick
9
11
4 �71 Bin.
B
TERMINOLOGY: Q10 = 10-Year Design Storm, Peak Discharge, (cfs)
D-o = Pipe Diameter, (in. & ft.)
d-50 = Mean Stone Diameter of Rip -Rap, (ft.)
L-a = Length of Rip -Rap Apron, (ft.)
3*D-o = Width of Rip -Rap Apron @ Pipe Outlet, (fit.)
W = Width of Rip -Rap Apron @ End of Apron, (ft.)
d-max = Maximum Stone Diameter of Rip -Rap, (ft. & in.)
Thickness = Thickness of Rip -Rap Apron With Filter Fabric, (ft. &in.)