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

Appendices 115
area can highlight the system structure but simplify the calculation. Moreover, since the
urban water system is managed as certain independent water entities structured in the
hierarchy, the chosen area can be the water entities in the whole Luqiao area later on.
Being the water entity of the City Area (CA), the chosen area is named LuQi. Three water
entities as the Urban District (UD) are formed, namely LuQi.01, LuQi.02 and LuQi.03. The
basic information of CA and UDs are given in Appendix.Table 12.
The water entities as the Water Utilisation Unit (WUU) are defined in each UD
(Appendix.Figure 7). A three-dimensional (3-D) map is provided in order to better understand
the area (Appendix.Figure 8). The 3-D map is the combination of the status quo and the
urban planning. It means that besides the existing facilities, the planned and confirmed ones
are also depicted in the map. The website (http://map.3dtz.cn/) providing the 3-D map supplies
also the detailed information of the buildings, structures and streets, which contains the basic
information to determine the water usage of water entities. Subsequently, the water entities
as the Water Utilisation Cell (WUC) in WUUs are determined. The basic information of
WUUs and WUCs are described in Appendix.Table 13.
There is deviation of data in both Appendix.Table 12 and Appendix.Table 13. Meantime,
the missing but indispensable data are made up in order to complete the case.
Appendix 2.2 System planning
The plan of the IUWS is implemented following the procedure given in Figure 26:
1. basic information of the planned area is collected.
2. the water entities of CA, UD, WUU and WUC are defined, and their basic information is
determined, which is listed in (Appendix.Table 12 and Appendix.Table 13).
3. water usage of WUUs and WUCs is determined. Due to the lack of data, the general
EUWUPs are used. The water demands (Appendix.Table 14 for WUCs and Appendix.Table
15 for WUUs), and the used water amounts (Appendix.Table 16 for WUUs) are calculated.
Three scenarios are considered.
Scenario 1: base on the conventional water consumption,
Scenario 2: use water saving fixtures,
Scenario 3: use Source Separated Collection System (SSCS) with vacuum toilets.
4. as the possible water sources for WUU, roof-water utilisation and direct potable water
reuse are measured for each WUU. The composition of water sources is determined for
each WUU (Appendix.Table 15).
5. the water system for each WUU is then determined: water supply method is based on §
3.3.2 and collection system is based on § 3.3.3. The decisions are listed in Appendix.Table
17 for Scenario 1.
In the first round, the water quality supplied from UD is not clear, so the determination of
supply and collection methods are suspended till the feedback comes from UDs.
6. the water usage of UDs is calculated by summing the water usage of their WUUs (the water
demands in Appendix.Table 18 and the used water amounts in Appendix.Table 19).
7. the water sources for UD are managed. In this case study, local surface water is not usable
as they are completely polluted, and groundwater is baned from using. Thus, UDs have
neither surface water nor groundwater sources. Initially, the process of storm water to
groundwater infiltration and indirect potable water reuse are not considered in UDs due to