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:
7
The 2D surface model is identical for all 1D/2D models, hence changes are only applied to the 1D network.
Table 2

Model data for baseline and simplified hydraulic 1D network models

Baseline 10,415 10,011 477 km 1.00
Merged
TxxxM035 9,421 9,017 477 km 0.90
TxxxM050 8,596 8,192 477 km 0.82
TxxxM075 7,832 7,428 477 km 0.75
TxxxM100 7,466 7,062 477 km 0.71
TxxxM100-NC 7,466 7,062 477 km 0.71
Trimmed
T300Mxxx 8,857 8,469 412 km 0.85
T400Mxxx 6,938 6,576 332 km 0.66
T500Mxxx 5,551 5,230 277 km 0.53
T500Mxxx-NC 5,551 5,230 277 km 0.53
Trimmed and subsequently merged
T300M035 7,998 7,610 412 km 0.76
T300M050 7,317 6,929 412 km 0.70
T400M050 5,597 5,235 332 km 0.53
T400M075 4,724 4,362 332 km 0.44
T500M075 4,416 4,095 277 km 0.42
T500M100 3,642 3,321 277 km 0.34
T500M100-NC 3,642 3,321 277 km 0.34
Baseline 10,415 10,011 477 km 1.00
Merged
TxxxM035 9,421 9,017 477 km 0.90
TxxxM050 8,596 8,192 477 km 0.82
TxxxM075 7,832 7,428 477 km 0.75
TxxxM100 7,466 7,062 477 km 0.71
TxxxM100-NC 7,466 7,062 477 km 0.71
Trimmed
T300Mxxx 8,857 8,469 412 km 0.85
T400Mxxx 6,938 6,576 332 km 0.66
T500Mxxx 5,551 5,230 277 km 0.53
T500Mxxx-NC 5,551 5,230 277 km 0.53
Trimmed and subsequently merged
T300M035 7,998 7,610 412 km 0.76
T300M050 7,317 6,929 412 km 0.70
T400M050 5,597 5,235 332 km 0.53
T400M075 4,724 4,362 332 km 0.44
T500M075 4,416 4,095 277 km 0.42
T500M100 3,642 3,321 277 km 0.34
T500M100-NC 3,642 3,321 277 km 0.34
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