388
17 Environmental Flow Definition and Management: A Case Study …
Table 17.11 Levels of demand
Region
Year
Irrigation demand
(1,000 m 3 /year)
Urban demand
(1,000 m 3 /year)
Total demand (1,000
m 3 /year)
Lower Zhu Creek 2004
16,080
3,650
19,730
2020
16,080
13,505
29,585
Lower Yong’an
Creek
2004
22,250
8,560
30,810
2020
30,900
18,010
48,910
Lower Shifeng
Creek
2004
16,740
5,420
22,160
2020
21,760
8,770
30,530
Yongning River
2004
330,000
84,550
414,550
2020
257,000
529,250
787,150
Source WET (2007)
Permission granted by WET project subject to proper citation
Table 17.11 shows the assumed levels of demand assumed in the IQQM.
17.3.4 Water Resources Allocation Plan Scenarios
Different scenarios were developed to allow assessment of the impacts of different
management arrangements on the provision of water for environmental purposes and
human uses. These included alternatives with respect to the construction of infrastructure, release rules for reservoirs (e.g., the circumstances under which releases
must be made for environmental purposes), the inter-operation of reservoirs (e.g.,
the rules for deciding when water is transferred from one reservoir to another), and
water-sharing rules (e.g., at what water level supply to different categories of water
users is stopped).
In broad terms, the focus is on how environmental flows could be provided while
optimizing supply reliabilities. Initially, scenarios were developed to compare the
current situation with the proposed 2020 arrangements, and the proposed 2020
arrangements were adjusted to incorporate the environmental flow rules.
Further scenarios were then developed to assess other issues, including the effects
of different operational arrangements for the proposed infrastructure, alternative
development proposals, and various combinations of these scenarios. Ultimately,
11 different scenarios were modeled (Table 17.12).
The following list provides notes on these scenarios.
• Except for Scenarios 1 and 7, each of the scenarios is based on the assumed
demands for the year 2020 outlined in the Taizhou water resources comprehensive
plan.
17 Environmental Flow Definition and Management: A Case Study …
Table 17.11 Levels of demand
Region
Year
Irrigation demand
(1,000 m 3 /year)
Urban demand
(1,000 m 3 /year)
Total demand (1,000
m 3 /year)
Lower Zhu Creek 2004
16,080
3,650
19,730
2020
16,080
13,505
29,585
Lower Yong’an
Creek
2004
22,250
8,560
30,810
2020
30,900
18,010
48,910
Lower Shifeng
Creek
2004
16,740
5,420
22,160
2020
21,760
8,770
30,530
Yongning River
2004
330,000
84,550
414,550
2020
257,000
529,250
787,150
Source WET (2007)
Permission granted by WET project subject to proper citation
Table 17.11 shows the assumed levels of demand assumed in the IQQM.
17.3.4 Water Resources Allocation Plan Scenarios
Different scenarios were developed to allow assessment of the impacts of different
management arrangements on the provision of water for environmental purposes and
human uses. These included alternatives with respect to the construction of infrastructure, release rules for reservoirs (e.g., the circumstances under which releases
must be made for environmental purposes), the inter-operation of reservoirs (e.g.,
the rules for deciding when water is transferred from one reservoir to another), and
water-sharing rules (e.g., at what water level supply to different categories of water
users is stopped).
In broad terms, the focus is on how environmental flows could be provided while
optimizing supply reliabilities. Initially, scenarios were developed to compare the
current situation with the proposed 2020 arrangements, and the proposed 2020
arrangements were adjusted to incorporate the environmental flow rules.
Further scenarios were then developed to assess other issues, including the effects
of different operational arrangements for the proposed infrastructure, alternative
development proposals, and various combinations of these scenarios. Ultimately,
11 different scenarios were modeled (Table 17.12).
The following list provides notes on these scenarios.
• Except for Scenarios 1 and 7, each of the scenarios is based on the assumed
demands for the year 2020 outlined in the Taizhou water resources comprehensive
plan.