Isohyet

P_i (mm)

A_i (km²)

P_i.A_i

P < 360

347

0.47

163.09

360 < P < 380

370

16.23

6005.1

380 < P < 400

390

35.49

13,841.1

400 < P < 420

410

35.33

14,485.3

420 < P < 440

430

36.79

15,819.7

440 < P < 460

450

41.69

18,760.5

460 < P < 480

470

39.29

18,466.3

480 < P < 500

490

133.37

65,351.3

P > 500

509

66.21

33,700.89

Total

404.86

186,593.28

P_avg (mm)

460.87