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

42 New Conception and Decision Support Model for IUWS
Since the system types vary the size and the structure of IUWS, they have to cooperate
with the WIS. Therefore, a matrix is set up (Table 15). Corresponding to each type of water
system given in Figure 13, the system size and seven parts of WIS have to be calculated
individually. As the integrated system, the seven parts of WIS need to be added up to one
lump sum. Hence, the summation is listed on the right side of the matrix. Since system cost
and energy consumption are chosen as the evaluation criteria, the matrix in Table 15 is used
to calculate those two parameters.
Table 15: General matrix for calculating cost and energy consumption of water entity
calculation of:
1. cost
2. energy
no. water system type
1 Sys. Base
water sources
2 Sys. +Rainwater
1. surface runoff
2. roof-water
3 Sys. +Reuse
1.indirct potable
2.direct non-potable
4 Sys. +Both
rainwater & reuse
Abbreviation: utilis. – utilisation
system size
[m 3 /d]
abstraction &
transmission
raw water
treatment
distribution
(networks)
collection
(sewer + drain)
used water
treatment
rainwater utilis.
(surface runoff)
rainwater utilis.
(roof-water)
- i. ii. iii. iv. v. vi. vii. -
As discussed and depicted in § 2.2, all types of water systems are not universally
applicable to all types of water entities. Therefore, a general Matrix (Table 15) needs to be
further developed individually for CA, UD and WUU (where water facilities in WUC are
excluded). For each type of water entity, options of all subsystems introduced in § 2.2 are
integrated together, whereby three matrices are generated for CA, UD and WUU respectively
and shown in Table 16, Table 17 and Table 18. In those matrices, the symbol “+” indicates
that the subsystem option is added to the basic system. If several “+” occur in one cell, it
means all indicated subsystem options are added at one time. The contents in the
parentheses indicate that in which hierarchical level the system option takes place.
As the system types are detailed, the second column in those tables is changed to
system option. Meanwhile, since not all seven parts of WIS are necessary to all types of
water entities, the right side of those tables are various as well. In general, the main focus of
CA lays on water sources and its system scales, as any variation of UD and WUU causes
the changes of water usage that eventually change the scales of CA. UD is the most
complicated type of water entity, while all kinds of subsystem options are applicable to it, as
well as it connects CA and WUU. The system options of WUU are quite simple with only four
varieties, as it has simple water sources.
summation