2011/4/1 Nathan Edgars II <[email protected]> > On 4/1/2011 10:38 AM, M∡rtin Koppenhoefer wrote: > >> Yes of course. I set FIXME=please check flow direction if I am unsure >> (usually you can deduct the flow direction but there is rare cases where >> it is not possible). >> > With manmade channels it's far from rare. Example: > http://www.openstreetmap.org/?way=73765043 > > > > I have never come across a waterway with changing > >> flow direction, >> > > http://my.sfwmd.gov/portal/page/portal/xrepository/sfwmd_repository_pdf/lake_management_area_descriptions.pdf > "The smaller S-58 water control structure located at the north end of Trout > Lake generally acts as the drainage divide for flows through the KCOL. This > is the case except under very high water conditions when water can be > released northward through the C-32C Canal into the Lake Preston, Myrtle, > and Joel LMA." >
not sure if this is a case for common waterways (or if it is another type), but sounds as if it were and if you needed 2 waterways to model this (one for the standard, and one for the high water conditions when water is released into another direction, if I get this right (sounds like an overfall). > There's also http://en.wikipedia.org/wiki/Reversing_Falls (which in a > general sense is oneway into the sea but on a large scale reverses daily). > If I get this right it is seawater, so IMHO the listed waterways are not suitable. cheers, Martin
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