Brownsville herald. [volume] (Brownsville, Tex.) 1910-current, 1928-09-07
HARLINCEN
PORT MEET

Continued from page seven)
= substantial revetment TO resist
them.
Riprap can be placed and replaced
without an expensive plant and can
be repaired. Of damage. without the
necessity Of calling y contractor. II
is very difficult to state in a case
like that Of an embankment across
the Laguna Madre just how much
riprap should be used. A covering Of
stone extending to a height Of two
and one-half feet above ordinary
water level will be sufficient to pro-
tect the outer slopes against any ex-
cept storm waves, along the northern
route. IL is probable that a cubic
yard 20 each three lineal feet will be
sufficient for the depths which will
be found in crossing the Laguna, at
any rate IL is recommended that this
amount be first tried if il should be
decided 20 riPrap the entertainments.
More can be readily added whenever
needed at cost not much greater than
II placed at one time. The stone for
this riprap should all be what is
termed"small stone In building the
Jetty and can be most economically
handled by a travelling derrick which
a swing il By one operation in skips
from car on barge 10 place Of deposit.
Portion Common 10 Both Routes
Dredged channel from junction Of
routes 70 Arroyo Colorado.
This portion extends westerly for
n distance Of almost one mile and
then northwest to the Arroyo Colo
RADIO meeting it about a mile north
Of the point where that body Of water
turn abruptly northward. that point
being six miles from the turn in the
channel or seven miles from the
junction. About half Of the latter
distance proceeding from the east Is
through land at water level or a little
lower, the western end being through
land gradually rising from water
level 70 ar elevation Of five feet AZ
the Arroyo. None Of the land through
which the channl passes is under
cultivation and the deposit Of the
dredged material should not be any
detriment 70 its use or adversely at
feet its value. The eastern portion OF
the channel, eve where in ground
below water level, will be in such
shallow water and be so protected By
island that riprap for the embank-
ments will hardly be needed. The ma
terial removed from the channel
should be deposited at leass 800 feet
back from the top Of the cut on each
side as on the island and in the La
guna.
The Arroyo Colorado
In this portion Of the channel the
work is entirely dredging along that
line which will gave the required
waterway at the least cost. 1t would
be difficult for the larger vessels
which would use q channel l6 feet
deep 10 pass around a bend which
has . sharper bend than one with q
radius Of curvature Of 1000 feet. This
has been taken as the limiting de-
gree of sharpness. Several points
exist where even with this curvature,
ID has been necessary 10 run outside
Of the present banks Of the Arroyo
to obtain a practicable route.
Causeway Across the Laguna
IL has been suggested that the
entertainments thrown up in dredging
the channel across che Laguna Madre
ear be utilized as either a single of
4 double causeway for the passage
Of vehicles.
The material removed from the
channel will make two embankments
lis feet high and about ~ feet wide
with side slopes Of one-third. If the
entertainments were II feet high, the
Ion width would be about 80 feet.
III the height were IS feet, the width
would be as feet. IL would therefore
seem preferable to limit the height to
about Is feet and to place the road
wnv on one side only Of the
channel. The difference OF height
Of two feet would make but little diff
ference in the exposure 10 wash from
tenn waves. and this difference
would probably be balanced hE the