ANS:B - is a method of routing that uses continuity the momentum equations

The Muskingum method is a hydrological flow routing model with lumped parameters, which describes the transformation of discharge waves in a river bed using two equations. The first one is the continuity equation (conservation of mass) and the second equation is the relationship between the storage, inflow, and outflow of the reach (the discharge storage Equation). These equations are applied within a river reach between two cross sections of A river.