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DAVID Evnn3 FlnD A330CIATE3, inc.
301 116TH AvcnuE 5.E.-3UITE 170 BELLEVUE, WAsi- Iiwon 98004 206/455-3571
DRAINAGE CALCS
FOR
KENCO
RENTON, WA
OCTOBER 1985
I.c7T- Ac'
c[:X�TG o. 10 �s►-to2T G�SS G �AST�lPjz,
G l;ur = o. :�
0 23 qc p&Z-koUc-- X o. Zo
l .32 Ac ► Mpc-,Zv,oUS X o. 1 o
I-V;4-
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P 980
tas
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T� = i D •� �"' = 10 +
1-11
QEl4t�T b = G ' ,LSD --� o. I (l ,) b) C I . SS) = O, l i Gf L
cA L,L 4-r-d P-.*E,Q L.UM 4ri i
62
A - Cy
1?4PL 1'1(02
a?. 0,►3�
t 4- z 7
I13• Q-
J.r= \(s.A.�-
PIPS u�r� ;
jq-6
LF
Ili„GMP
A O."f8yj
OAC
r2
24 c+� P
A • �, �-
OkL
11"X4.1" GMP
Ac = IT(o
PIM- AiZe-H
IZ•4Z
if
5¢ 0 M.H,s
A 15,1
3
IF
'NIS I cPI,
A= 3,06
[b/LF
QFLrr =
fe% Sy le.T U
rA.e-
10-1(o-S5 -
�l = 155.4- Pr 3
155,3 FT ---
Vx 1,584- FT3
`! jell, 5 F-r J
J = 61. 2 FTS
.4- F�3
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-�JL,-g
2I
lq� 2 207•O = ZJ
. STRENGih DESIGN FOR AhMCO
PIPE AND PIPE -ARCHES
Correct thickness for a properly installed corrugated steel drainage structure depends on size and on loading conditions.
Table 1. H 20 LIVE LOAD Table 2. E 80 LIVE LOAD _
-.. _....._ . _. 22/3' X 1/i' Corrugations -- ---. _ - - 22/3' X 1/2' Corrugations
Diameter
or Span
in Inches
Min ,
Cover
Maximum Cover In Feet
Specified Thickness in Inches
0.052 .064 1 .079 .109 1 .138 .168
12
199
248
310
15
159
199
248
18
132
166
207
21
113
142
178
249
24
99
124
155
218
27
tv
111
138
193
30
0
99
124
174
36
a
83
103
145
186
42
E
71
88
124
160
195
48
__
62
77
109
140
171
54
66
93
120
147
60
79
102
125
66
68
87
107
72
73
89
78
74
84
61
90
50
96
41 .;
*From top of pipe to top of subgrade.rw
NOTES:
1. The above tables are from the American Iron and Steel Insti-
tute's "Handbook of Steel Drainage & Highway Construction Pro-
ducts," 1973.
2. The thicknesses shown are the minimum structural require-
ments for use with backfill of adequate quality and compaction to
hold the structure closely to its fabricated shape when under load.
3. Indicated thicknesses provide structural safety factors of 3.0
Table
,+.,.ACRES DRAINED BY VERTS
(Based on Talbot Formula) -
Round Pipe
Mountainous
Rolling
Flat
pe-Are
Diameter End Area
Country
Country
Country
pan x Risel ,Endh Area
In Inches in Sq. Ft.
C = 1
C = 1/3
C = 1/5
In Inches / lln Sq. Ft.
12
.79
3/4
3
6
-
-
15
1.23
1
6
11
17x13
1.1
18
1.77
2
9
18
21x15
1.6
21
2.40
3
14
28
2418
2.2
24
3.14
5
20
39
28x20
2.8
30
4.91
8
36
71
35x24
4.4
36
7.07
14
59
115
42x29
6.4
42
9.62
20
89
175
49x33
8.7
48
12.6
29
125
250
57x38
11.4
54
16.0
40
175
345
6443
14.3
60
19.6
55
230
455
71x47
17.6 C
66
23.8
70
295
585
-
-
72
28.3
85
375
735
-
-
78
33.2
105
460
910
-
-
84
38.5
130
560
1110
-
-
90
44.2
155
680
1310
-
-
J 96
50.3
185
800
1560
-
-
'Acres based upon round pipe computations. Table gives equivalent pipe -
smaller end areas. \
rches showing slightly
0iamete'r
Min.Maximum
Cover in Feet
Specified Thickness in Inches
or Span
Cover
In Inches
0.052 .064 .079 .109 1 .138 .168
12
199
248
310
1
15
159
199
248
1
18
132
166
207
J
21
113
142
178
249
24
99
124
155
218
27
111
138
193
30
99
124
174
36
83
103
145
186
42
71
88
124
160
195
48
62
77
109
140
171
54
66
93
120
147
60
79
102
125
66
E
68
87
107
72
2
73
89
78
;,
74
84
61
90
E
50
96
N
41
when riveted pipe is carrying maximum height of cover shown.
4. The following values are used for the soil and steel parameters:
Unit Weight of Soil-120 lb per cu ft
Relative Density of Compacted Backfill-Minimum 85% Std AASHO
Yield Point of Steel-33,000 psi
5. Contact Armco for strength design information for diameters
and thicknesses not shown.
Installed in 1928, old photo above shows location of 60-inch-diameter
Armco Galvanized Pipe under a 77-foot-high railroad fill. Small photo
shows interior of pipe during recent inspection, revealing continuing
good alignment.
3