Drain material
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.. module:: xc
	    
.. autoclass:: DrainBilinearMaterial
    :members:
    :show-inheritance:
	    
.. autoclass:: DrainClough1Material
    :members:
    :show-inheritance:
	    
.. autoclass:: DrainClough2Material
    :members:
    :show-inheritance:
	    
.. autoclass:: DrainPinch1Material
    :members:
    :show-inheritance: