THE TWO-AXIS METHOD: A NEW METHOD TO CALCULATE AVERAGE PRECIPITATION OVER A BASIN / La deux-axes méthode: une nouvelle méthode pour la calculation de la précipitation moyenne d'un bassin versant

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Abstract
The two-axis method, used to calculate average precipitation over a basin, is based on three assumptions inherent in the Thiessen and isohyetal methods. The method follows four steps: (1) The two axes of a basin are drawn following a standard procedure; (2) for each raingauge location a station angle is determined by either measuring or calculating the angle between lines connecting the station location to the farthest ends of the two axes; (3) each station is assigned a weight (the ratio of its angle to the sum of all station angles); (4) average area precipitation is calculated as the sum of the products of corresponding station weights and measured precipitation. The method is fast, efficient, and is readily computerized.

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