TM 5-5420-209-12
Section III. OPERATION UNDER USUAL CONDITIONS
2-12. General. This section contains requirements and procedures for Launching and retrieving bays, assembling bays
to form either a bridge or raft, procedures for constructing or retrieving a bridge or raft, and guidelines for operating a bridge
or raft under normal operations.
2-13. Site Requirements. In order to launch bays and erect either a bridge or raft, the following technical site require-
ments are needed. Refer to figures 2-10 through 2-13 for typical site layouts and table 2-2 for bridge assembly
requirements.
a. A water depth of at least 40 in. (102 cm) in main body of water for operation of bridge erection boats.
b. Launching area near planned bridge erection site for launching of bridge erection boats.
c. A bank height of less than 48 in. (112 cm) to accommodate ramp bay approach ramps.
d. A bank height of less than 60 in. (152 cm) with a water depth of at least 72 in. (178 cm) for free launch, or a bank
height of less than 28 ft. (8.53 m) for high bank launch.
e. Down stream launching site from planned center line of bridge for launching of bays.
f. Good access road from bay launch area to staging area.
g. A 15 ft. (4.58 m) bank width for maneuvering transporter.
h. A minimum down stream floating area of 100ft. (30.50m) in areas wher ewater is flowing more than 1 ft./see. (0.30
m/sec.).
2-43
