By United States Army
FM 5-33 Terrain research, very important info for comparing terrain for army operations.
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Additional resources for FM 5-33 Terrain Analysis
Trace the boundaries, in black pencil or ink, of all open-water bodies such as ponds, lakes and double-lined streams and label them with a W. Trace the boundaries of all built-up areas that are longer and wider than 250 meters (5 milimeters at 1:50,000 scale). Label the outlined areas with an X. Step 5. Determine vegetation types and boundaries. Trace the boundaries of all forested areas. For the working overlay, label all forested areas with a T. Further analysis will determine type, size, density, and internal boundaries or changes.
They are rectangular in cross section and usually concrete. A large box culvert is similar to a slab bridge. Arch culverts were used frequently in the past but are rarely constructed now. They are concrete, masonry, brick, or timber. Rail girder spans are found on lightly built railways or, in an emergency, on any line. The rails are laid side by side and keyed head to base and may be used for spans of 3 meters or less. Tunnels, Galleries, and Snowsheds Features on a transportation route where it would be relatively easy to block traffic or that affect the traffic capacity of the road are critical.
Climatic conditions such as seasonal floods, excessive dry seasons, freezing, and other extremes of weather materially affect stream foldability. The velocity of the current and the presence of debris also affect the condition and passability of a ford. 5 meters per second), and slow (less than 1 meter per second). Low-water Bridges Low-warm bridges consist of two or more intermediate supports with concrete decking and are located whoIly within ravines or gullies. During high-water periods, they may easily be confused with paved fords, as both are completely submerged.