Problem 3.7 Point rainfalls due to a storm at several rain-gauge stations in a basin are shown in Fig. 3.16. Determine the mean areal depth of rainfall over the basin. 8 cm 6 cm zone Area(km²) 410 8 cm 900 200 N (9.2) zone 2850 IV 1750 O (7.4 cm D (9.2) V 720 A (8.6) (8.5) L (5.2) nd t VI 550 C (108) (5.6) Area of the Basin =7180 km² H (15) E (138) K (7.8) B (7.6 tati F (10.4) 1 (11.2) J (9.5 للعممت hang 10 cm zone V zone IV zone ill Figure 3.16 Isohyetal Map