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The range of pipe roughness values in both cases (triangular and trapezoidal) at the 0 HT ht level is the same, i.e., 110 to 130. For example, the minimum and maximum values obtained by the authors for HT ht are 8.88 and HT ht , while Sivakumar et al. ([5]) reported 5.81 and HT ht . Because the range of pipe roughness values at the 0 HT ht level in both triangular and trapezoidal cases is the same, MFs of pipe discharges and nodal heads at the 0 HT ht level should be identical. However, for other HT ht levels, these are different. [Extracted from the article]

A similar analysis is not applicable for Case Study 2 because the settings of the HT ht values are 0 for both PSVs and emitters. Hence, the discussers used PSV settings of zero instead of the HT ht values given in Table 2 of the original paper. The probable reason behind the authors' incorrect results for HT ht and 1.5 is that the default value of 0.5 might have been used for the global emitter exponent. [Extracted from the article]