25
DESIGN OF ICE BOOMS
5 @ 168'
Flow
100'
Debris Opening
26.5
15. Plan view of the
river area upstream of
Dam
the Lock and Dam 8 on
the Allegheny River.
The boom is made up of
five, 168-ft (51-m) spans
aligned at a 26.5 angle
to the cross-channel
0 + 56
9 + 53
direction.
16. Elevation view of a
free overflow weir.
Table 4. Monthly average discharges for Allegheny River.
December
January
February
March
(ft3/s)
(m3/s)
(ft3/s)
(m3/s)
(ft3/s)
(m3/s)
(ft3/s)
(m3/s)
MEAN
27,460
777
38,460
1090
17,550
497
54,950
1556
MAX
44,100
1250
88,500
2506
52,500
1486
99,200
2807
MIN
15,200
430
18,800
532
7,450
211
23,500
665
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