OpenHPL
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The OpenHPL is an open-source hydropower library that consists of hydropower unit models and is modelled using Modelica.
Based on HEC-RAS calculations as shown in https://www.hec.usace.army.mil/confluence/rasdocs/ras1dtechref/latest/modeling-gated-spillways-weirs-and-drop-structures/hydraulic-computations-through-gated-spillways/radial-gates
This fixes #57 by adding a base class of a valve which then in turn is used by a **new** valve model and a modified simple turbine model.
Having a valve model would make it more obvious to create simple waterway models without the need for turbines. Though currently the general `Turbine` model is nothing else than a...
This is a follow-up from #21. It would be nice to have a better quality image for the explanation of the KP method currently stored in `besad.png`: 
Add an implementation of elastic pipe (electircal analoge, similar to SIMSEN).
The industry standard IEC60193 contains formulas for determining graviation, density, atmospheric pressure, vapour pressure etc. (inkl. default values).
@boerrebj: Abstract classes (partial classes in Modelica terminology) are useful for collecting common parts of multiple detailed models. As an example, - **AbstractPipe** basis class for both rigid water column...