GfsSourceCulvert
From Gerris
GfsSourceCulvert approximates the effect of flow through a culvert within a GfsRiver simulation. The relationship between water levels, elevations, culvert characteristics and flow rate is based on the paper by Boyd, 1987.
The syntax in parameter files is
[ GfsSourcePipe ] { type = box B = 1 entrance = 1 n = 0.011 ke = 0 }
where the parameters are set to their default values. The parameters are
 type
 either
box
orpipe
(for a circular culvert). The box height or pipe diameter are given by theDIAMETER
parameter of the parent GfsSourcePipe.  B
 for box culverts only, the box width.
 entrance
 entrance type following Boyd, 1987. Entrance type 1 is Wingwall Flare 30° to 75°, Entrance type 2 is Wingwall Flare 90° and 15°, Entrance type 3 is Wingwall Flare 0°.
 n
 Manning friction coefficient. The default is for concrete (when using SI units).
 ke
 entrance loss coefficient.
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See also

culvert
module  Karamea flood tutorial
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References
M. J. Boyd  Generalised headdischarge equations for culverts
 Proceedings of the fourth national local government engineering conference pp. 161165, Perth, August, 1987
 Bibtex