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<br />The design output includes the detailed design information <br />and sufficient data to make the final design selection or <br />to indicate that a different design or designs should be <br />considered. Design selection is discussed and detailed <br />design problems and procedures are provided in the last <br />chapter of the manual. <br /> <br />The circular contains sections which discuss erosion hazards <br />and provide guidance on velocity reduction, flow transition <br />designs, as well as a procedure for estimating scour in <br />a sand bed channel. The design of free hydraulic jumps <br />for various channel shapes and slopes is included along <br />with energy dissipator designs which utilize forced hydraulic <br />jumps. The design of several types of impact basins, drop <br />structures, and stilling well or vertical flow devices are <br />included. The last design chapter deals with the riprap basin. <br /> <br />Although it was not always possible, every effort has been <br />made to treat energy dissipator design as illustrated by <br />the conceptual model. The weakest areas are the initial <br />scour determination and the economic data necessary for the <br />selection process. <br /> <br />Throughout the circular, an attempt has been made to relate <br />the designs to actual situations through example problems. <br />Examples of the application of each type of energy dissipator <br />are presented in chapter 12. Each of the design chapters <br />includes the best available design information to date. <br />The entire manual should be considered as a dynamic framework <br />within which material will be added and deleted as new infor- <br />mation becomes available. <br /> <br />I--' <br /> <br />e <br /> <br />~ <br /> <br />e <br /> <br />, <br /> <br />e <br />