Answer to Question #260399 in Civil and Environmental Engineering for moh

Question

 2.4. Compute the mean annual precipitation for the watershed in the figure for Problem 2.3 using the arithmetic mean and the Thiessen polygon method. The gauge readings for gauges A-K, respectively, are: 28.1, 33.7. 25.6. 23.9. 24.6. 40.7. 41.3.37.2. 38.7. 41.1, and 29.3

Answer 1

Arithmetic method

Average rainfall=$(28.1+33.7+25.6+23.9+24.6+40.7+41.3+37.2+38.7+41.1+29.3)/11$

=33.10

Thiessen polygon method

Rainfall =(P1A1+P2A2+P3A3+---)/(A1+A2+A3+----)

isohyetal method

(((P1+P2)/2)A1+((P2+P3)/2)A2+--)/(A1+A2+A3+----)

As the area is not given so not able to calculate