Abstract
In a lecture about fundamental issues in numerical hydraulicsgiven within the theme “Frontiers in Hydraulics: ComputationalHydraulics” of the Iowa Hydraulics Colloquium, Liggett (1996)indicated the solution of transient flow in networks as a problemthat had not been studied as intensively as many other hydraulicsproblems. Moreover, Liggett voted for inverse analysis as thenext big push in numerical hydraulics. In the discussers’ opinion,this paper not only gives a valuable contribution in the field oftransient test-based techniques (TTBT) for simple pipe systemdiagnosis but also points out some crucial aspects that couldbe investigated more extensively. Precisely, to improve the per-formance of TTBT for the detection of possible anomalies(e.g., leaks, partial blockages, partially closed in-line valves,and illegal branches), the following questions arise: (1) why notcouple the ITA approach with a preliminary analysis of transientpressure data? and (2) why not generate controlled and sharppressure waves by means of proper devices instead of by maneu-vering valves?With regard to the first question, some benefits could beachieved by first locating the anomalies by analyzing the timehistory of the pressure (i.e., pressure signal,
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