Discussion of 'Dealing with Zero Flows in Solving the Nonlinear Equations for Water Distribution Systems' by Sylvan Elhay and Angus R. Simpson.

The article discusses the research by Sylvan Elhay and Angus R. Simpson regarding the use of regularization technique to address the computation failure when solving the governing equations of a hydraulic network in consideration to global gradient algorithm. It mentions that the technique is incapable if the Jacobian matrix of J in the equation of the research is singular. It includes several equations used in the research such as one for diagonal elements of matrix F.