Compute the mean annual precipitation for the river basin shown in the figure below using the Thiessen polygon method. The location of the various rain gauge stations and the point precipitation values are indicated in the table below. Table 3. Rainfall data and areas of thiesen polygon Rainfall, Pi (cm) Area (ha) 7.88 2.8 8.67 Raingauge Station A 84.0 B 81.0 69.0 79.0 12.57 3.02 5.79 5.22 8.45 63.0 H. 58.0 61.0 69.0 K 56.0 8.05 Fig.1. River basin and location of raingauges Mean annual precipitation: O None of the choices O 70.13 cm O 66.74 cm O 69.79 cm O 73.34 cm

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