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

General Priority of Water Sources
Chapter 2 · New Conception 31
high middle low
a. groundwater
b. surface water
2.2.2.2 planning process
c.1 surface runoff infiltration
c.2 roof-water utilisation
d.1 indirect potable water reuse
d.2 direct non-potable water reuse
e. long distance diversion
f. seawater
Figure 17: General priority of water sources
The general planning process is applicable to all types of water entities, which is divided
into two steps (Figure 18). Firstly, the possible water sources are identified with consideration
of their water quantity, quality and priorities. Based on the water usage of the water entity,
the proper sources are selected. Afterwards, the corresponding facilities are calculated in the
second step.
Process for Planning Water Sources
subsystem 2
Water Source
Source type
local
external
Quantity
quantity
step 1
Possible
supplied quality
raw
B/C
A(1)
raw + B/C
raw + A(1)
B/C + A(1)
Figure 18: Process for planning water sources
Intake
no
yes
step 2
Transmission
The local sources only have the raw water quality as they are obtained from the nature.
The raw water should be matched with the raw water categories given in Table 4, and
meantime follow the local raw water quality standards. Regarding the external water sources,
besides raw water quality, it can also be Quality A(1), B and C when water comes from the
superior water entities (see Table 2 for the categorisation of desired water quality). As
reclaimed water cannot be for the direct potable use, A(1) indicates that only raw water is
no
yes