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Faith: What about some of the design
challenges to a project like this?
Tom: Some of the design challenges as
part of this whole project were, in
particular, as you saw downstream it
was nothing but a concrete line channel
that was an extreme elevation and with
a width of about three feet and depth
of about three inches. So that's not
the kind of channel we were trying to
restore. So there were some remnant
channels that we could use as a
template full of concrete rubble and
such, but trying to estimate that
channel bank flow, which was what we
designed here at the top of the bank,
and then we knew our slope, so we had
to tie into this concrete lining.
We knew our upstream elevation from the
pipes, so we were able to incorporate
the top – the lower end of the riffle
and the top end of the riffle
elevations. These as you can see the
outside meanders are a little more
armored but the inside have those point
bar areas, so they don't require the
heavy rock. But we're trying to
incorporate those as well as the pools
around the bends which are deeper. So
as you know the grade is controlled
through these riffles, and it's two
kinds of channel types that we had as
cross-sections are a typical riffle and
typical pool. And then you kind of fill
in the excavation as the outside
meanders in the pool.
So the contractors did a fantastic job
as well as the team in general in
assisting them and laying out this
channel and getting it constructed as
was designed on the plant. One of the
things too that I think is so important
as part of our projects is that this
overall stream design and the overall
staging is all thought of together
integrated with the roadway
construction, everything from the
timing of the wetland plants, as well
as the dewatering, and the timing of
moving equipment and roadways. So
that's the real advantage with our
whole team effort with this project.
That includes DOT, DNR, myself, and the
consultant engineers, so it's what
makes these projects far more
successful than they would be without
everyone talking together.
Faith: Yeah. And then you get to link
all these different parts together as well.
Tom: Right. Right. So what we're trying
to do is just trying to get it to
function properly, and then we know
there's gonna be adjustments over time.
But this whole area is designed to
overbank and reduce erosion on the
banks, and it will come up slowly as we
get on the upland side. But that was
all part of the modeling, and so the
height of this elevation was
approximately adjusted for a two-year
event, but since most of this area is
fed by storm water pipes, you can see
water flowing out through there now.
And you can see the pipes of the
headwater, you can't get much more
unnatural, but we're trying to recreate
a more natural stream given the
flashiness and through here.
And we're trying to recreate not just
improved water quality, and the
potential for fisheries is limited
right now given we have several miles
of concrete lining. But from a wildlife
perspective and from an infiltration of
stormwater and reducing the total
suspended solids, and recreation of the
diverse wetland and upland areas for
migratory birds and even aesthetics and
recreation, we're trying to accomplish
all those things. As well as of course
flood mitigation and trying to tie in
and not flood any homes and to try to
accomplish both these things at the same time.
[End of Audio]
Title: Design considerations for more natural channel reconstructions, Villa Mann Creek, Wisconsin freeway reconstruction project
Faith Fitzpatrick (U.S. Geological Survey) Tom Slawski (Southeastern Wisconsin Regional Planning Commission) talk about design challenges related to finding reference characteristics for reconstruction more natural channels from stormwater-derived cement lined channels. Stream and wetland construction goes hand-in-hand with roadway construction.
Location: WI, Villa Mann Creek, USA
Date Taken: 11/17/2010
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 McMahon: Video
Tom Slawski (Southeastern Wisconsin Regional Planning Commission)
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