on 1.3
Slope I on 1.3
STONE
X
SECTION
-
(BUILT
- Minimum
weight 5 t o n s .
Deck Stone
M i n i m u m weight 3 t o n s , not l e s s t h a n 5 0 %
"A" s t o n e
5 t o n s or more.
pounds.
Minimum weight
Stone
c
or m o r e , n o t
Not less than 3 5 %
Stone
more than 3 % less than o n e p o u n d .
Minimum weight 7 t o n s
T o e Stone
Reinforcing bars
BLACK ROCK CANAL
6
Z
SECTION
BUILT 1822 - 1825
(REBUILT 1837 - 1937)
SECTION
Y
BUILT
SUB -STRUCTURE
SUPER -STRUCTURE 1928 - 1929
T Y P I C A L S E C T I O N S OF B I R D I S L A N D P I E R
Figure 272. Typical structure cross sections,
Black Rock Channel, New York
398
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