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<br />
<br />INTRODUCTION
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<br />event given a knowledge of some associated event. The procedure calculates the depth and
<br />velocity of the flood that has a 1 percent chance of occurrence at any point on a fan-shaped
<br />region, given a knowledge of the peak flow-frequency relationship at the apex of the fan. The
<br />procedure is based on only a few postulates and is attractive in the simplicity of both its
<br />conception and its implementation.
<br />In its initial form (Dawdy, 1979), the procedure assumes:
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<br />. That the peak flow-frequency has been estimated for the apex of the fan.
<br />. That the alluvial fan is shaped like a sector of a cone, all of which is subject to flooding,
<br />and that channels move across its surface at random during floods or from flood to flood (i.e.,
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