Chapter 3 Decision Support Model (IUWS-DSM) - Tubdok

46 New Conception and Decision Support Model for IUWS
enter the urban water systems through the water entities of CA and UD, the matching of
water usage and water sources are performed first in CA, and then associated in UD.
After determining the water usage and water sources of CA, the water infrastructure is
calculated in the sequence of CA, UD and WUU. As mentioned before, water facilities of
WUC are not included. When the procedure ends at WUU, two sides are verified within each
water entity. If they are not matched, the same procedure needs to be repeated. The
procedure is sketched in Figure 22. The dashed arrow line indicates that the iteration can
skip the calculation of WUC, as the water usage of WUC may have insignificant variations.
The hollow arrows inside each water entity indicate the interrelation between water usage
side and water infrastructure side.
Planning Procedure for IUWS
Start
WUC
water usage
Abbreviations:
WUU
water usage
water
infrastructure
UD
water usage
water
infrastructure
CA
water usage
water
infrastructure
WUC – Water Utilisation Cell WUU – Water Utilisation Unit UD –Urban District CA – City Area
2.3.3 Demonstration
Figure 22: Planning procedure for IUWS
A proper planned IUWS should consider, design and organise all above mentioned
components in the same time. For perceptually comprehending the IUWS, one demonstration
as the diagram is made up (Figure 23), which displays all necessary elements
synchronously, such as the hierarchy of the IUWS, water end-users, different water sources,
water supply, used water and rainwater management. Different system options are also
involved, like surface runoff and roof-water utilisation, direct non-potable water reuse and
indirect potable water reuse. In the demonstration, only a few water entities are included with
quite complicated system options for each entity. In reality, it is just contrary, where more
water entities of WUC, WUU and UD are established, but each entity has simpler water
system.
So far, the new conception of IUWSs is presented. It is the foundation of the decision
support model for planning IUWSs, which is introduced in the next chapter.