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

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Appendix 2.3 System analyses and discussion Appendices 117 The water systems of CA and UDs are the main focus. As the independent water entities, the water usage of each UD is presented resprectively (Appendix.Figure 3). In each UD, the water usage of three scenarios is depicted simultaneously. As an example, UD of LuQi.01 is chosen for performing the analyses. Comparing to Scenario 1, Scenario 2 has significantly lower water consumption where 18% of total water demand can be saved. Scenario 3 has the lowest water demand in general. However, it requires the SSCS and blackwater system, which can be very expensive. Hence, Scenario 2 is certainly a better situation, where the priority of Scenario 3 depends on its costs. Within each scenario, roof-water utilisation has little influence on the total system due to its small volume. Hence, whether using roof-water system is the individual decision for each WUU, but not for the whole system. Direct non-potable water reuse can be applied either in WUUs or UD, which save the similar amount of water. Direct reuse in UD generates even less used water that needs to be discharged into the nature. Thus, the costs of two types of water reuse need to be calculated, and then compared based the method given in Table 34 in § 3.5.2. If it is desired, the water reuse systems between scenarios can also be performed. Regarding CA, the similar figure of water usage is generated (Appendix.Figure 4). The difference of water consumption between different system options and scenarios are clearly revealed. The amounts of used water can be also easily compared. Roof-water utilisation does not have the significant change to the total water system, either. Indirect potable reuse may be applied in CA. The cost comparison of the Indirect potable reuse systems can be done between scenarios. In each scenario, the comparison of water reuse can be performed between indirect potable reuse in CA, direct non-potable reuse in UD, and direct non-potable reuse in WUU. Since there are two types of external sources, i.e. long-distance water diversion and seawater desalination, the comparison of cost needs to be achieved. Step further, since local water sources have the quality problem, the dual water system may be taken into account, which can be another system option that needs to be compared. All comparison follows the methods given in Table 33 and Table 34 in § 3.5.2. For the strategic management of the IUWS, the water balance between water usage and sources is mapped in Appendix.Figure 5. Besides the external water sources, there are other potentials, whereby threes cases are proposed: Case 1: no usable local water sources; Case 2: with surface runoff utilisation; and Case 3: with usable local water sources. It shows that the volume of rainwater is huge, whereas only 30% of rainwater can already fulfil the water demand of certain scenario. If local water sources are usable, they can satisfy the most portion of water demand. If surface runoff and local sources are both utilisable, the water reuse system is not necessary anymore. Since the local environment is polluted, the additional treatment can be necessary for both groundwater recharge of surface runoff and surface water utilisation. Subsequently, the costs comparison can be implemented between different types of water sources. This case study is a terse demonstration of using the IUWS-DSM. It focuses on how to follow the planning procedure and how to generate the system options and then analyse them. The calculation of system costs and energy consumption are skipped because of the deficiency of the essential information.
118 New Conception and Decision Support Model for IUWS 10 3 m 3 /d 10 3 m 3 /d 10 3 m 3 /d 12 10 8 6 4 2 0 -2 -4 -6 -8 -10 12 10 8 6 4 2 0 -2 -4 -6 -8 -10 20 15 10 5 0 -5 -10 -15 -20 WUU: ext.src. +rf.wa. +drct. reuse +both WUU: ext.src. +rf.wa. Water Usage of UD (LuQi.01) WUU: ext.src. +rf.wa. +drct. reuse +both UD: ext.src. UD: +drct.reuse UD: ext.src. UD: +drct.reuse UD: ext.src. UD: +drct.reuse Scenario 1 Scenario 2 Scenario 3 WUU: ext.src. +rf.wa. +drct. reuse +both WUU: ext.src. +rf.wa. WUU: ext.src. +rf.wa. +drct. reuse ext.src. (UD) drct.reuse (UD) used.wa.->disch. wa.demand (UD) WUU: ext.src. +rf.wa. Water Usage of UD (LuQi.02) WUU: ext.src. +rf.wa. +drct. reuse +both UD: ext.src. UD: +drct.reuse UD: ext.src. UD: +drct.reuse UD: ext.src. UD: +drct.reuse Scenario 1 Scenario 2 Scenario 3 WUU: ext.src. +rf.wa. +drct. reuse +both WUU: ext.src. +rf.wa. WUU: ext.src. +rf.wa. +drct. reuse ext.src. (UD) drct.reuse (UD) used.wa.->disch. wa.demand (UD) WUU: ext.src. +rf.wa. Water Usage of UD (LuQi.03) WUU: ext.src. +rf.wa. +drct. reuse +both UD: ext.src. UD: +drct.reuse UD: ext.src. UD: +drct.reuse UD: ext.src. UD: +drct.reuse Scenario 1 Scenario 2 Scenario 3 WUU: ext.src. +rf.wa. WUU: ext.src. +rf.wa. +drct. reuse ext.src. (UD) drct.reuse (UD) used.wa.->disch. wa.demand (UD) Appendix.Figure 3: Water usage of UDs +both +both +both WUU: ext.src. WUU: ext.src. WUU: ext.src. +rf.wa. +rf.wa. +rf.wa.
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New Conception and Decision Support
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Acknowledgements By this chance, I
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Contents Indices I TABLES .........
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Indices III 3.6 Realisation Method
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Indices V Table 32: Sheet of averag
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Indices VII Figure 31: Cost estimat
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Definitions term definition & expla
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Abstract Indices XI Traditionally,
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2 New Conception and Decision Suppo
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Chapter 2 New Conception Chapter 2
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Composition of Modern Urban Water S
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2.1.4.1 water quality Chapter 2 ·
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Chapter 2 · New Conception 15 Aust
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Chapter 2 · New Conception 17 sepa
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Classifcation of Urban Water Treatm
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Chapter 2 · New Conception 21 Thre
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2.1.4.3 conveying system Chapter 2
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Chapter 2 · New Conception 25 of r
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Chapter 2 · New Conception 27 syst
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Chapter 2 · New Conception 29 betw
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General Priority of Water Sources C
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Chapter 2 · New Conception 33 Sing
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Chapter 2 · New Conception 35 irri
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Table 10: System options of used wa
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Chapter 2 · New Conception 39 flus
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2.3 Integrated Urban Water System (
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Table 16: Matrix for calculating co
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Table 18: Matrix for calculating co
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external sources City Area (CA) 1 s
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Chapter 3 Decision Support Model (IUWS-DSM) - Tubdok

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