area = 1 hectare = 1.55 x 10^7 sq.inch
water fell = 2.5 in
volume of water = area x water fell in inches
                        Â
= 1.55 x 10^7 x 2.5
                        Â
= 3.88 x 10^7 in^3
1 cubic inch = 0.01639 liters
3.88 x 10^7 in^3 = 3.88 x 10^7 x 0.01639
                        Â
= 635112.5 liters
                        Â
= 6.35 x 10^5 Liters
                        Â