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

12 New Conception and Decision Support Model for IUWS
administrative canton, but also can be the natural division. Potentially, it is quite appropriate
for the municipal administration of water systems. UD is the container holding the water
entities of GROUP type.
Water Utilisation Unit (WUU). It is the certain functional unit or group in cities and
consequently, its water system can be managed and coordinated as one entity. For example,
it can be one university or one hospital or two adjacent residential quarters. WUU covers
certain area containing certain water end-users. The water uses with different requirements
regarding quality and quantity are properly allocated and balanced within WUU.
Water Utilisation Cell (WUC). It has the same structure as WUU but on a small scale
that mostly focuses on single large buildings or mono- water end-users. A typical example is
a large building purely as a gastronomic centre, or a shopping mall. WUC is the subset and
complement for WUU. For example, in one residential quarter (i.e. as a WUU), besides the
household water demand as the main water consumption of WUU, there can be a shopping
centre with significant water consumption, which is considered as the WUC. Another
example is the university, which can contain several kinds of water end-users, like, cafeteria
and sport centre, whose water usage can be calculated as individual WUCs.
Type One:
ZONE
Type Two:
GROUP
Hierarchy of the Urban Water System
level 4 level 3 level 2 level 1
Urban District
(UD) 1.1
WUU
1.2.1
Urban District
(UD) 1.2
WUC
1.2.2.1
WUU
1.2.2
WUC
1.2.2.2
WUU
1.2.3
City Area
(CA) 1
WUU
1.3.1
WUC
1.3.2.1
Urban District
(UD) 1.3
WUU
1.3.2
WUC
1.3.2.2
Abbreviation:
WUU – Water Utilization Unit
WUC – Water Utilization Cell
WUU
1.4.1
WUC
1.3.2.3
Figure 6: Hierarchy of the urban water system (demonstration)
Urban District
(UD) 1.4
Such a hierarchical structure is very flexible and versatile, which provides the chances to
plan and manage urban water systems in different depths in various situations. As an
integrated system consisting of many independent water entities, it allows to plan the water
systems in blocks and steps, which can better cooperate with urban planning, and which is
also closer to the actual development process of cities.
2.1.4 Essential components
Though urban water systems can be designed and managed in different ways, several
essential components remain the same, i.e. water quality, water intake and treatment
facilities, conveying system, and water fixtures. Working together they reach the targets of
satisfying end-users and lowering fresh water and energy demands simultaneously. They are
redefined based on the new conception of IUWS.
WUU
1.4.2