Question: 4 . AREAL AVERAGE CATCHMENT RAINFALL ESTIMATION ( 1 ) For the tutor: The catchment map below shows the five Thiessen polygons with area Ai

4. AREAL AVERAGE CATCHMENT RAINFALL ESTIMATION
(1) For the tutor: The catchment map below shows the five Thiessen polygons with area Ai
corresponding to the 5 rainfall gauges (Pi). Given the rainfall data in the table below, determine
the areally averaged rainfall using the Theissen method and compare this with the arithmetic
average.
Rain Gauge, i 12345
Rainfall, Pi (mm)1020304050
Area, Ai (km2)0.224.021.351.61.95

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