Environmental Engineering Reference
In-Depth Information
All the generated networks show the layouts resembling what could be considered as a 'real
water distribution outlook'. For the samples of ±50 networks, the generation time has been
between a few seconds and a few minutes, depending on the selected settings. It is however
not always that the generation time is proportional to the number of junctions, preferred
number of networks or the level of complexity; the random generation process has been more
erratic in this respect, which can also be attributed to the occasionally less logical
combination of input settings. Tables 4.15 and 4.16 give indications about running times of
NGT for various conditions in random and non-random mode of generation, respectively.
Table 4.15
NGT running times for various modes of random network generation (15 in each segment)
20 junctions
77 junctions
200 junctions
No of links Run time Network
type
No of links Run time Network
type
No of links Run time Network
type
19 - 20
5 sec
Branched
Low
complex
1 hrs, not
complete
Low
complex
76 - 90
10 sec
199 - 260
Low
complex
21 - 22
3 sec
260 - 275
224 sec
4 sec
7 sec
2 hrs, not
complete
276 - 285
75 sec
30 - 31
32 - 33
34 - 35
2 sec
4 sec
218 sec
106 - 120
121 - 135
> 135
Mid
complex
Mid
complex
286 - 300
59 sec
Mid
complex
301 - 315
33 sec
315 - 330
135 sec
35 min, not
complete
330 - 345
Table 4.16
NGT running times for various modes of non-random network generation
20 junctions
No of Links
Column range
Network type
Run time
19 - 20
1 to 3
Branched
< 1 sec
21 - 22
1 to 3
Low complex
< 1 sec
30 - 31
1 to 6
2 sec
32 - 33
1 to 6
Mid complex
2 sec
34 - 35
1 to 6
3 sec
36 - 37
5 to 7
3 sec
38 - 39
6 to 7
High complex
3 sec
39 - 40
6 to 7
5 sec
Table 4.15 shows that the preferred number of networks could have not been reached for
some segments of networks, next to the inconsistent running time, which is not necessarily a
surprise. For instance, insisting on a network layout of 260 links and 200 junctions and
setting the low maximum number of nodal connections, in order to maintain the preferred
low complexity, is practically impossible assignment and random generator may not be able
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