1. (40 points) Given the following inflow and outflow hydrographs, use the Muskingum method with a nonlinear regression to estimate the values of K and X by minimizing the total mean squared error as shown in class. Plot: a) the inflow using a dashed line, b) the observed outflow using square hollow markers with no line, and c) the simulated outflow using a solid line on a single chart in MS Excel. Include a legend.