A simple, practical method for computing station weights, which are commonly used in operational (i.e., real-time) hydrologic modeling, is presented. The weights are derived using Thiessen polygons and widely available isohyetal information. The method is shown to eliminate long-term bias associated with the difference between the spatial distribution of precipitation implied by Thiessen polygons and the more accurate spatial distribution depicted by an isohyetal map.
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Fritz Fiedler (2003) studied this question.