Table 2 gives an overview of the 1D models used for simulation in the baseline and after simplification. The simplified models are denoted as T###M### with T denoting a model where links smaller than this threshold diameter in mm were trimmed, while M denotes where links shorter than the threshold in metres were merged. The notation xxx marks that either the trimming or merging module is not used for the simplification. Further, some models are denoted with ‘NC’ as an abbreviation for ‘no compensations’, thus no time and volume compensations have been implemented in these models. As a measure of the level of simplification, we use the network reduction factor, NRF:The 2D surface model is identical for all 1D/2D models, hence changes are only applied to the 1D network.