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

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Table 27: General rules for determining collection system Chapter 3 · Decision Support Model (IUWS-DSM) 67 no. IF THEN conditions or examples without storm drain [1] 1 precipitation < 400 mm/a no storm drain The ground slope has also the effect that cannot be skipped. [2] 2 impervious area < 30% or infiltration rate > 60% 3 4 without sewage sewer sewage is totally disposed or reused in inferior water entities no or very little sewage is generated combined system [2] 5 400 mm/a < precipitation < 800 mm/a no storm drain e.g. urban green space, urban agriculture quarter no sewage sewer e.g. all WUU in UD have their own water reuse systems no sewage sewer e.g. urban large green area use COMBINED system There are lower risks and less impact from storm water to environment due to the low precipitation. 6 SSCS is applied use COMBINED system i.e. surface runoff + greywater has the highest priority 7 no place to construct two pipelines parallel 8 cost of pipe laid down is extremely high sewage sewer: source separated collection [2] 9 household water consumption > 50% [3] 10 [3], [4] 11 reclaimed water from greywater can be fully reused by local users capita equivalent of water entity > 5000 use COMBINED system e.g. many municipal pipelines under the narrow streets use COMBINED system e.g. in the rock area consider SSCS The main water consumption is from household. consider SSCS It reaches the local water balance. consider SSCS and construct blackwater treatment system It mainly considers economies of scale and energy balance. [1] from MOHURD (2006) [2] it set up based on experience, which can be adjusted based on the local conditions. [3] the treatment facilities of greywater and blackwater are two independent systems, so they are determined separately. [4] personal contact with Mrs. Wendland (Sanitation Policy Advisor, Women in Europe for a Common Future (WECF), E-mail: claudia.wendland@wecf.eu) Explanation: in the rest situations that are not mentioned in the table, the types of collection systems need to be determined according to the actual conditions.
68 New Conception and Decision Support Model for IUWS 3.3.4 Used water After determining the collection system (in Table 26), based on the application conditions (in Table 27) and following the planning process (in Figure 20), the system options of used water in Table 10 are further detailed by given their priorities (Table 28). The priorities in Table 28 should be read in vertical direction. The column of receptor/user in Table 28 indicates the system options where the contents in parentheses represent the desired quality after treatment. Only options 1 to 6 of the collection system (in Table 26) are taken into account since option 7 and 8 have not sewer system. In CA, the options for used water are simple, i.e. either discharge or indirect potable reuse, whereby the water quality is upgraded to either discharge level or Quality A(2). If local water source is adequate, indirect potable reuse is not taken into account because it is more expensive after all. If the indirect potable reuse is the proper option, the greywater has higher priority to be considered than urban sewage without respect to sewerage types. Having the simple variation, the option priorities for CA are not shown in Table 28. Table 28: System options and general priorities of used water no. UD receptor / user 1 upper level sewer (quality: no change) 2 local water body (quality: disch. level) 3 self end-user (quality: B(2)/C(2)) 4 neighbour end-user (quality: B(2)/C(2)) 5 local water body (quality: A(2)) WUU / WUC 1 upper level sewer (quality: no change) 3 self end-user (quality: B(2)/C(2)) 4 neighbour end-user (quality: B(2)/C(2)) applicability 1 combine srfc.runoff + gry.wa. 2 separate a. srfc.runoff b. gry.wa. 3 combine srfc.runoff + sewage Priority 4 separate a. srfc.runoff b. sewage 5 only gry.wa. sewer 6 only sewage sewer � 4 4 1 2 4 2 � 1 1 2 1 1 1 � 3 3 4 4 3 4 � - - - - - - � 2 2 3 3 2 3 � 3 3 1 1 3 1 � 1 1 3 3 1 3 � 2 2 2 2 2 2 Abbreviations: srfc. – surface; gry.wa. – greywater; disch. – discharge Legend: � – applicable; � – not applicable; - – not applied; Explanation: in the column of Priority, the sub-columns are corresponding to the options in Table 26.
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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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LuQi.02 LuQi.01 Source: http://www.
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Appendix.Figure 8: 3-D map of the c
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WUU WUC type area [ha] popul. [capi
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Appendix.Table 14: Water demands an
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unit: m 3 /d demand : current deman
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Appendix.Table 16: Used water amoun
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Appendix.Table 17: Determination of
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146 New Conception and Decision Sup
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Chapter 3 Decision Support Model (IUWS-DSM) - Tubdok

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