Figure P1-19

Four rainfall gages

with watershed

boundary.

EF

mi

1.19. A small urban watershed has four rainfall gages as located in Figure P1-19.

Total rainfall recorded at each gage during a storm event is listed in the table

below. Compute the mean areal rainfall for this storm using (a) arithmetic

averaging and (b) the Thiessen method.

B

Gage

A

B

C

0.88

6.72

D

Rainfall

(in.)

3.26

2.92

162

30

3.01

3.05