{% extends "layout.html.jinja" %}
{% set title = "Exposure Categories" %}
{% block contents %}
    <dl>
        <dt>Exposure B</dt>
        <dd>
            Surface Roughness B :Urban and suburban areas, wooded areas, or other terrain with numerous closely
            spaced obstructions having the size of single-family dwellings or larger.
            <br>
            For buildings with a mean roof height of less than or equal to 30 ft (9.1 m), Exposure B shall apply
            where the ground surface roughness, as defined above, prevails in the upwind direction for a distance
            greater than 1,500 ft (457 m). For buildings with a mean roof height greater than 30 ft (9.1 m),
            Exposure B shall apply where Surface Roughness B prevails in the upwind direction for a distance greater
            than 2,600 ft (792 m) or 20 times the height of the building, whichever is greater.
        </dd>
        <dt>Exposure C</dt>
        <dd>
            Surface Roughness C: Open terrain with scattered obstructions having heights generally less than 30 ft
            (9.1 m). This category includes ﬂat open country and grasslands.
            <br>
            Exposure C shall apply for all cases where Exposures B or D do not apply.
        </dd>
        <dt>Exposure D</dt>
        <dd>
            Surface Roughness D: Flat, unobstructed areas and water surfaces. This category includes smooth mud flats,
            salt flats, and unbroken ice.
            <br>
            Exposure D shall apply where the ground surface roughness, as defined by Surface Roughness D, prevails
            in the upwind direction for a distance greater than 5,000 ft (1,524 m) or 20 times the building height,
            whichever is greater. Exposure D shall also apply where the ground surface roughness immediately upwind
            of the site is B or C, and the site is within a distance of 600 ft (183 m) or 20 times the building height,
            whichever is greater, from an Exposure D condition as defined in the previous sentence.
        </dd>
        <dt>Exposure B to C</dt>
        <dd>
            Used to Interpolate between B and C exposures. B to C represents B exposure upwind and C
            exposure
            at the building. Transition distance is defined as the distance from the building to where exposure category
            changes.
        </dd>
        <dt>Exposure C to B</dt>
        <dd>
            Used to Interpolate between B and C exposures. C to B represents C exposure upwind and B
            exposure
            at the building. Transition distance is defined as the distance from the building to where exposure category
            changes.
        </dd>
    </dl>
{% endblock %}