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Faith: Joe, we're right up at the top of the
Carriage Hills site here. Say a little bit
about the special design there with how
the stormwater comes out and goes into this drainage.
Joe: Sure, originally this was a headwall
with an exposed pipe that was about
20 feet lower than this and was
actually extended further downstream
as well. So that has all come out
and has been replaced with a bubbler
which is a structure that allows, as
the stormwater is running off of the
landscape, it has to actually well
up out of this structure before it can
flow down the RSC. The idea there is to
reduce the velocity of the water and
the energy that that discharge is
going to have as soon as it enters this restored reach.
One of the biggest mistakes that we
see with stream restoration, in
particular stormwater dominated
stream restoration, is the stream
starts at the invert of the discharging
pipe so there is absolutely no loss
of energy from that pipe. This approach
backwaters that pipe. There is still
plenty of fall so there is no impact
to upstream flooding, but you really
have a tremendous benefit from reduction
in energies at the outfall as a result of
this type of design.
[End of Audio]
Title: Special stormwater outfalls (bubblers) used in stream restoration projects to reduce erosive energy, Carriage Hills Outfall, Maryland
Faith Fitzpatrick (U.S. Geological Survey) and Joe Berg (BioHabitats, Inc.) describe bubble up inlet structures that help to reduce erosive energy for stormwater outfalls where they discharge into rehabilitated streams.
Location: Carriage Hills, MD, USA
Date Taken: 3/22/2011
Video Producer: Douglas A. Harned , National Water-Quality Assessment Program (NAWQA), USGS, North Carolina Water Science Center, Raleigh, NC
Note: This video has been released into the public domain by the U.S. Geological Survey for use in its entirety. Some videos may contain pieces of copyrighted material. If you wish to use a portion of the video for any purpose, other than for resharing/reposting the video in its entirety, please contact the Video Producer/Videographer listed with this video. Please refer to the USGS Copyright section for how to credit this video.
Additional Video Credits:
Faith Fitzpatrick: Scriptwriter, Narrator, Scientist Consultant
Gerard McMahon: Producer
Douglas Harned: Producer, Video, Editor
Alan Cressler: Video
Luke Myers: Video
Joe Berg (BioHabitats, Inc.)
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