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This appendix addresses the detailed engineer planning necessary for a river-crossing operation. The charts and overlays that are used to synchronize and control execution of the crossing are shown in Figures B-1 through B-8 and Tables B-1 through B-4. The H, as used in the figures in this chapter, stands for H-hour; this is the specific hour the assault phase begins (see FM 101-5-1).


Initial engineer planning at corps and division levels focuses on providing sufficient engineer assets to handle crossing requirements. The terrain teams at division and corps levels maintain the terrain database that provides potential crossing sites and river widths. The division engineer uses this information to construct a site overlay (see Figure B-1). He labels assault and rafting or bridging sites and shows the site capacity and the estimated preparation time for each site (from the terrain database).

Preparation time is the time required to improve routes and riverbanks to support the units that will use the site. It also includes the time required to construct rafts and bridges. Rafting-site capacity is the number of raft round trips per hour. The engineer calculates rafting-site capacity by multiplying the number of raft trips per hour by the number of rafts and the number of centerlines at the site (see Table B-1). Centerlines must be at least 100 meters apart. Each assault company needs 200 meters of river frontage. Figure B-1 shows the determination of rafts per hour and the capacity of the assault site for the division crossing overlay. The site overlay provides additional details necessary to ensure that each brigade has sufficient potential crossing sites within its boundaries. Table B-2 provides planning factors for assault-boat operations.

Rules of thumb for making this determination follow:

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