The only significant variable for modelling the total pipeline length was the peak flow rate, for both land uses. For the ‘General Residential’ land use, the reservoir distance from centroid variable exhibited a mild correlation with the dependent variable. However, this correlation was not strong enough to significantly improve the model. Therefore, for both land uses, the total pipeline length was modelled as a function of the peak flow rate. The final model formulae are presented in Equations (2) and (3), with the symbols defined in Table 8.