Figure 3.

A transfer graph for the hydronephrosis pathophysiology scenario. The nodes in the graph consist of located measurements. The main types of measurement are Process rate (P) or Material state (M). The type of biophysical (e.g. pressure, mass) measurement is depicted in red in the top right corner of the node symbol. In the bottom right, the location of the measurement is indicated geometrically as conduit Wall (W) or Content (C), as well as in more detail in free text (red). The direction of the edges (green) indicates the location with respect to the equals sign in equations I–VI, from r.h.s. to l.h.s. The subgraphs highlighted by regions A and B are discussed in the text. A mapping between the above nodes and the variables in equations I–VI is provided in figure 4. (Online version in colour.)