The document discusses flood routing techniques. It outlines the objectives of learning how to calculate outflow hydrographs from inflow hydrographs for reservoirs and river reaches. It describes hydrologic routing as using continuity equations to relate inflows, outflows, and storage to solve for outflows, while hydraulic routing also uses momentum equations and requires more detailed flow information. The document focuses on explaining hydrologic reservoir and river routing techniques like the storage indicator method, Runga-Kutta method, and Muskingham-Cunge method.