cusec means cubic foot per second (cu $ sec) 1 cubic foot=6 gallon of water whereas 1 gallon=3.64liters vich means one cubic foot=21.84 liters.

It conclude that when 21.84 liter of water passes per second is called one cusec.

Now imagine 10 lac cusec water,which means 21840000liters of water (2crors,18 lakh,40 hazar litter) is passing each seconds.

Its beyond 2 belive de pressure of water at this heavy quantum,thats Y Its named supreme flood.