Question: 2- Find the average annual rainfall of the watershed area shown below using: a. Arithmetic Average b. Isohyetal method c. Thiessen polygon method. d. Distance

 

2- Find the average annual rainfall of the watershed area shown below using:

a. Arithmetic Average

b. Isohyetal method

c. Thiessen polygon method.

d. Distance weighting

Consider each small grid having an area 1 km2.

Gauge Station

Annual Rainfall (inches)

Gauge Station

Annual Rainfall (inches)

1

22

5

48

2

35

6

28

3

38

7

34

4

28

8

25

2 8 0 5 km 

2 8 0 5 km

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