Reservoir

A reservoir is a downstream boundary condition. The element immediately upstream should be a straight channel element. The following constants have to be specified on the line beneath the *FLUID SECTION,TYPE=CHANNEL RESERVOIR card:

• the width $b$
• the trapezoid angle $\theta$
• not used
• the slope $S_0 = \sin \phi, -1<S_0<1$ (for this element the slope must be given explicitly and is not calculated from the coordinates of the end nodes belonging to the element)
• the grain diameter $k_s$ for the White-Colebrook law or the Manning constant $n$ for the Manning law (in the latter case the user has to specify the parameter MANNING on the *FLUID SECTION card)

The width, the trapezoid angle, the slope and the grain diameter are needed to calculate the critical and normal depth. They should be the same as the straight channel element immediately upstream of the reservoir.

The water depth in the downstream node of a reservoir element must be defined by the user by means of a *BOUNDARY card (degree of freedom 2).

Example files: channel1, chanson1.