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Chapter 11 ENERGY DISSIPATORS

Chapter 11. ENERGY DISSIPATORS . SOUTH DAKOTA DRAINAGE MANUAL. October 2011. South Dakota Drainage Manual ENERGY DISSIPATORS Table of Contents Section Page INTRODUCTION ..11-1. Overview ..11-1. Definition ..11-1. HEC 14 ..11-1. TYPE SELECTION ..11-2. General ..11-2. SDDOT Practices ..11-2. Guidelines ..11-2. design Ice Buildup ..11-5. Debris Control ..11-5. Flood Frequency ..11-5. Maximum Culvert Exit Velocity ..11-5. Tailwater Relationship ..11-6. Cost ..11-6. Weep design PROCEDURE ..11-7. design EXAMPLES ..11-11. riprap APRONS ..11-12. Apron Use Independent of Other ENERGY DISSIPATORS ..11-12. Apron Use with Other ENERGY DISSIPATORS ..11-18. REFERENCES ..11-20. 11-i South Dakota Drainage Manual ENERGY DISSIPATORS List of Figures Figure Page Figure ENERGY DISSIPATORS AND LIMITATIONS (Reference (1)) .. 11-3. Figure ENERGY DISSIPATOR design PROCEDURE .. 11-7. Figure riprap APRON AT BOX CULVERT OUTLET .. 11-12. Figure SDDOT riprap CLASSES AND APRON DEPTHS .. 11-14. Figure RECOMMENDED SDDOT APRON DEPTHS.

“Roadside Channels” and Chapter 15 “Bank Protection.” 11.1.2 Definition ... With the exception of riprap aprons, the HEC 14 design methods have ... 9 Contra Costa basin < 3 H M M < 0.5D 9 Hook basin 1.8 to 3 H M M Not needed 9 USBR Type VI impact basin5 ...

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