If l=2000m and width 1000m and avg depth 10m.
so total is 20,000,000m3

agar pahad banau toh 3.14*30*150*150= 2119500m3

If L = 2000m and W = 1000m and avg depth 20m
so total is 40000000m3

agar pahad banau toh 3.14*20*150*150=1413000m3