  This paper proposes a technique to identify individual pipe roughness
parameters in a water distribution network by means of the inversion of the
steady-state hydraulic network equations. By enabling the reconstruction of
these hydraulic friction parameters to be reliable, this technique improves the
conventional model's accuracy and thereby promises to enhance model-based
leakage detection and localization. As it is the case in so-called fireflow
tests, this methodology is founded on the premise to measure the pressure
distributed at a subset of nodes in the network's graph while assuming the
nodal consumption to be known. Beside of the proposed problem formulation,
which is restricted to only allow turbulent flow in each of the network's pipes
initially, developed algorithms are presented and evaluated using simulation
examples.
