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

40 New Conception and Decision Support Model for IUWS
filtration can take place in WUU, as well. The corresponding decision making rules are
introduced in § 3.3.3 and § 3.3.5.
Table 12: System options of rainwater water – Surface runoff management
no. collection storage no. receptor treatment
elimination
CA UD WUU
1 combined -- 1 upper level drain -- � � �
2 separate √ 2 surface water body -- � � �
3 no need utilisation
3 groundwater
-- � � �
4 groundwater [1] √ � � �
Legend: √ – needed; -- – no need; � – applicable; � – not applicable
[1]
if the storm water quality does not meet the corresponding water standards, the additional
treatment facilities are necessary.
As the small size system, the roof-water utilisation system is simple and applied only to
WUU and WUC. Based on the supplied water quality, there are three options that are listed
in Table 13.
Table 13: System options of rainwater water – Roof-water utilisation
no. outflow quality treatment CA UD WUU WUC
1 C(1) -- � � � �
2 B(1) √ � � � �
3 A(1) √ � � � �
Legend: √ – needed; -- – no need; � – applicable; � – not applicable
All the subsystems of IUWS have been built up, and their system options have been
discussed. As independent subsystems, all planning processes that are given above work
individually. In the meantime as the IUWS, five subsystems must be properly constructed
together. Consequently, the corresponding system options and planning processes need to
be carried out, which are introduced and discussed in the next section.