20230678 Ver 1_Design/Maps/Site Plans Revised_20230705 (3)

ENERGY DISSIPATOR DESIGN WORKSHEET
PROJECT: DATE PREPARED:
NEW HANOVER COUNTY VICE DETECTIVES EXPANSION 7/5/2023
DESCRIPTION: PREPARED FOR:
CULVERTI NCDEQ
ENGINEER: * PREPARED BY: REVIEWED BY:
V�MC M&CREED DCO RMC
PROJECT NO.04245-0012
SCM 1 - OUTFALL
Outlet flowrate 6.30 cfs Total Q = 18.9 CFS. Flow divided by 3 for multiple culverts.
Pipe diameter 18 inches
Outlet pipe slope 0.25 percent
Number of pipes 1
Des. flow velocity 3.56 ft/sec
Fieurc 8.06.b.1
25
20 Z one-6-Zone 7
u
15
w
Z
d 10
5
ft/sec
on
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above =
1
Outlet pipe diameter
18 in.
Apron Length =
6.0 ft.
Outlet flowrate
6.3 cfs
Apron Width =
4.5 ft.
Outlet velocity
3.6 ft/sec
Max. Stone Dia =
6 in.
Material =-
Class A
Thickness =
9 in.
Zone
Material
Max Stone Dia.
Thickness
Length
Width
1
Class A
6
9
4 x D(o)
3 x D(o)
2
Class B
12
18
6 x D(o)
3 x D(o)
3
Class I
17
26
8 x D(o)
3 x D(o)
4
Class II
23
35
10 x D(o)
3 x D(o)
Notcs:
1. Calculations based on NY DOT method - Section 8.06.05 through 8.06.06 in NCDENR ESC Manual.
McKim Creed, Inc.
243 N Front Street
Wilmington, North Carolina 28401
[phone]
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