1. Baffle walls, stilling basins, and their combinations are the simplest and quite effective energy dissipators. Their hydraulic calculation methods for conditions of the two-dimensional problem have been developed rather reliably and cover a wide range of problems. Consideration of the working conditions of the outlet as an incomplete front, especially in the case of considerable nonuniformity, requires a further study, mainly with respect to estimating hydrodynamic loads, cavitation safety, and scouring. 2. A dissipator in the form of one row of rectangular or trapezoidal piers is less effective than a solid wall, but has good dissipative action. The data of Figs. 2 and 4 can be used for calculation. 3. Maximum hydraulic effectiveness with completely acceptable flow regimes can be provided by constructing near the contracted section two rows of piers (Fig. 1f) or their combination with a basin or wall; however, the possibility of the practical realization of such a scheme requires special substantiation with consideration of hydrodynamic loads and cavitation.