This work compares several alternative methods of Pressure Driven Analysis (PDA) implemented within the code base of the EPANET water distribution system modeling software. The resulting code includes a direct method, the original and a newly modified version of the inverse method currently used by EPANET 2.2, and two recently published methods (the Global Gradient Approach based PDA and the Active Set Method). The latter four methods solve PDA problems using an inverse flow-pressure relationship while the direct method uses the original relationship. The alternative methods were extensively tested, and their performance compared over several case study water distribution networks of vastly different sizes and complexity. The results showed that all of the new inverse methods are equally efficient and reliable while the direct method is less reliable by having a higher frequency of failing to converge.
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