This training document was written to assist users of computer program HEC-5, Simulation of Flood Control and Conservation Systems in hydropower applications. This document supplements the program Users Manual, which is the basic documentation for the program. The chapters on hydropower application describe the data requirements, program operation, and program output for the HEC-5 hydropower routines. Hydropower applications cover power reservoirs, system power, pumped storage, fire energy optimization, and strategies for using the HEC 5 program. The Users Manual, available from the Hydrologic Engineering Center, provides the input specifications. The conceptual model of a reservoir system is a branching network with a reservoir at the start of every branch. The reservoirs and nonreservoir control points are linked to each othr by routing criteria. The whole system cascades downstream ad converges to a final control point. Reservoirs and control points are the only locations where flows, constraints, and demands are evaluated by the program. Diversions may be used to route flows to other locations in or out of the basin. (Author).