Stream Meander
Stream Meander
(OP)
Designing a stream to replace an existing shallow closed donduit sewer. The new stream is to have several minor meanders and pass the 1 year storm. After that, the stream banks will overtop and cause the area to pond. My questions is, how do I calculate an acceptable radius of curvature and meander wavelength so it is not to sharp or frequent? Channel is to be trap. with 2.5' base 2:1 sides and 0.9% slope. 1 year peak is 32 cfs.





RE: Stream Meander
RE: Stream Meander
RE: Stream Meander
I would look for similar sized and gradient streams/creeks (cricks?) in similar soils and see what the natural 'meander is.
RE: Stream Meander
If you slope is flat enough (low velocity) the channel may not scour or superelevate through the bends.
RE: Stream Meander
Stream Restoration, A Natural Design Handbook, prepared by the North Carolina Stream Restoration Institure and North Carolina Sea Grant
THE WES Stream Investigation and Streambank Stabiliaztion
or as gbam said.....any open hydraulics text
With a design crieria of a 1-year storm, you can check for super elevation but the increase in water surface elevation will be minimal. If your super elevation difference is more than 1-2" for your channel, you'll need to review your design as your probably going to erode the channel banks to due high velocities.
Checking erosion thresholds is a must. Look at other watercourses in your area and try to mimic existing conditions where ever possible (i.e. similar grade, channel cross section, vegetation,granular material, etc)
RE: Stream Meander
He is the self-proclaimed master of all things of stream classification and rehabilitation.
http
RE: Stream Meander
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Stream Meander
How often do you use the Manning's equation? Did you ever spend the $30 to pick up his paper describing it? No, then how do you know what it is?
Despite some critics, his ideas are becoming mainstream and are not hard to find if you look around. In his defense though, his classes are pretty intersting, and he is an interesting character.
RE: Stream Meander
you might want to look upstream (or downstream but upstream is preferred I think) of the reach that you're looking at. If it's in a natural state (i.e. not confined by a road, culverts, etc) you can survey the toe of the base flow channel to get the natural meander, sinuosity, profile and channel dimensions. If this is not an option try to find a similar stream nearby. Looking at aerial maps (Google Earth, Seamless Viewer) is a good place to start. If survey isn't an option aerial photo's can provide at least the sinuosity and meander.
RE: Stream Meander
Anybody know where I can nab a PDF of it?
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com