CIV E 632 - COMPUTATIONAL HYDRAULICS AND HYDROLOGY SPRING 2009 HOMEWORK No. 4 Derive the C3 lateral-inflow routing coefficient in the Muskingum-Cunge method: C3 = 2C/(1+ C + D) First derive the Muskingum routing equation with lateral inflow, see Eq. 19 in Appendix I of Ponce's  paper. Note that the notation between these two papers has changed.