14.3 Water Resource Regulation
299
The annual water resource regulation plan is based on monthly figures, including
reservoir release, water abstraction of the province, water consumption, and
provincial boundary flow (which is most important and provides the basis for
reporting).
For the flooding season, YRCC will issue the monthly water-use plan for each
province, but not related to reservoirs because it is under flood regulation. This plan
is used to remind the provinces not to use more water because even water use during
the flood season will count toward provincial consumption.
The monthly plan is applied from November to March for the upstream and
November to Febuary for the downstream because in the period, water is mainly
supplied for stable industrial and domestic use and only for very little agricultural
use.
The 10-day plan is used from April to June in the upstream and March to June in
the downstream, which are the water-use peak times due to irrigation. During peak
time, YRCC issues a 10-day regulation plan based on the monthly plan. Before the
5th, 15th, and 25th of each month, the provincial agency submits the next 10-day
water-use proposal to YRCC; and then before the 8th, 18th, and 28th of each month,
YRCC issues 10-day water resource regulation plan.
Additionally, in the winter, there is an ice regulation aimed to alleviate the icemelting flooding in the spring. The regulation is day based and is the responsibility
of the river basin flood-control headquarters.
The runoff forecasting is done at the end of Oct based on monitoring data from the
flood season, reservoir storage, and water use of provinces during the flood season.
The forecast is runoffs for the non-flood season (from November to June), and the
accuracy is quite high with less than 5% error. Based on the forecast, YRCC will
formulate an annual water resource regulation plan. If the province proposed more
than the allocation based on the forecast, YRCC will reduce; however, if less, YRCC
will not increase.
There is a bias control for the regulation. The daily release bias from the reservoirs
should be within 5% of the figure in the plan. The monthly, 10-day average runoffs
in the control transects, such as provincial boundary, should not be less than 95% of
the figure in the plan, and the daily average runoff in the control transects should not
be less than 90% of the figures in the plan.
14.3.2 Water Use in HID
The HID Management Bureau has formulated a series of rules and regulations for
managing irrigation water within the district in accordance with national policies and
under the guidance of the county and prefecture/provincial WADs. The water use in
the district is implemented by the HID management bureau, its section offices, and
WUAs.
HID prepares a channel-scheduling plan of water flow at sluices leading off
of the main (first-level) canal. The plan is then passed down to section offices
299
The annual water resource regulation plan is based on monthly figures, including
reservoir release, water abstraction of the province, water consumption, and
provincial boundary flow (which is most important and provides the basis for
reporting).
For the flooding season, YRCC will issue the monthly water-use plan for each
province, but not related to reservoirs because it is under flood regulation. This plan
is used to remind the provinces not to use more water because even water use during
the flood season will count toward provincial consumption.
The monthly plan is applied from November to March for the upstream and
November to Febuary for the downstream because in the period, water is mainly
supplied for stable industrial and domestic use and only for very little agricultural
use.
The 10-day plan is used from April to June in the upstream and March to June in
the downstream, which are the water-use peak times due to irrigation. During peak
time, YRCC issues a 10-day regulation plan based on the monthly plan. Before the
5th, 15th, and 25th of each month, the provincial agency submits the next 10-day
water-use proposal to YRCC; and then before the 8th, 18th, and 28th of each month,
YRCC issues 10-day water resource regulation plan.
Additionally, in the winter, there is an ice regulation aimed to alleviate the icemelting flooding in the spring. The regulation is day based and is the responsibility
of the river basin flood-control headquarters.
The runoff forecasting is done at the end of Oct based on monitoring data from the
flood season, reservoir storage, and water use of provinces during the flood season.
The forecast is runoffs for the non-flood season (from November to June), and the
accuracy is quite high with less than 5% error. Based on the forecast, YRCC will
formulate an annual water resource regulation plan. If the province proposed more
than the allocation based on the forecast, YRCC will reduce; however, if less, YRCC
will not increase.
There is a bias control for the regulation. The daily release bias from the reservoirs
should be within 5% of the figure in the plan. The monthly, 10-day average runoffs
in the control transects, such as provincial boundary, should not be less than 95% of
the figure in the plan, and the daily average runoff in the control transects should not
be less than 90% of the figures in the plan.
14.3.2 Water Use in HID
The HID Management Bureau has formulated a series of rules and regulations for
managing irrigation water within the district in accordance with national policies and
under the guidance of the county and prefecture/provincial WADs. The water use in
the district is implemented by the HID management bureau, its section offices, and
WUAs.
HID prepares a channel-scheduling plan of water flow at sluices leading off
of the main (first-level) canal. The plan is then passed down to section offices