he graph's edge descriptor
  type.<br>
  <b>Default:</b> <tt>get(edge_residual_capacity, g)</tt>
</blockquote>

IN: <tt>reverse_edge_map(ReverseEdgeMap rev)</tt>
<blockquote>
  An edge property map that maps every edge <i>(u,v)</i> in the graph
  to the reverse edge <i>(v,u)</i>. The map must be a model of
  constant <a href="../../property_map/doc/LvaluePropertyMap.html">Lvalue
  Property Map</a>. The key type of the map must be the graph's edge
  descriptor type.<br>
  <b>Default:</b> <tt>get(edge_reverse