Energy Dissipator

[CvlEngr123]

Anybody have an example design of a baffled energy dissipator or point me in the right direction to the equation for one? A municipality is requiring that an energy dissipator be constructed at the end of a detention pond outlet. The outlet is a "V-Notch" outlet.

 

[fel3]

Baffled outlets are covered in "Design of Small Canal Structures" by the US Bureau of Reclamation. I designed a half dozen baffled outlets back in the mid-1980s and this book (in hard-cover format) was my guide.

The book can now be downloaded in .pdf format from several sources. IIRC, I downloaded it from the USBR website about 10 years ago, but I can't find it on their site right now.

BTW, we call them "baffled outlets" because calling them "befuddled outlets" is considered politically incorrect.

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"Is it the only lesson of history that mankind is unteachable?"
--Winston S. Churchill

 

[cvg]

USBR Type VI
Hydraulic Design of Stilling Basins and Energy Dissipators
Engineering Monograph No. 25

available via google

 

[jgailla]

I've used CMU or concrete blocks embedded in concrete for an energy dissipator downstream of a weir.
As long as the velocity was fairly low I didn't do calculations, just added 3 to 5 staggered rows of blocks and spaced them so that they ended where the outlet slope leveled off.

 

[gbam]

FHWA HEC14

http://www.fhwa.dot.gov/engineering/hydraulics/culverthyd/culvert.cfm

 

[CvlEngr123]

Thanks for all of the responses. I will be looking for the resources indicated in the responses.

 

[sam74]

I'd go with the HY-8 free computer software. Not nearly as fun as the design manuals it is intended to somewhat automate but much easier and quicker to use.