Exercise $1.$ Spatial Rainfall Variability

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You are given the measured data for each rainfall gauge in Table $1.$

First, calculate the arithmetic mean: Show working.

ADR$=$

Work out the ADR based on the other two methods:

Table $1.$ Rainfall data for Thiessen polygon method $($complete polygon diagram overleaf$).$

Table $2.$ Rainfall data for iso$-$hyet method $($refer to contour plot in instructions$).$

Figure $1.$ Gridded map for polygon construction and area estimates.