Provisions of the Operation Rules 740

Suggested adjustments

Article 13. Dry season operation principles: section 3

Hoa Binh, Thac Ba and Tuyen Quang reservoirs jointly operate to ensure the water level of not below 2.2 m at the Hanoi Hydrological Station during the increased release period.

Hoa Binh, Thac Ba and Tuyen Quang reservoirs jointly operate to maintain the average water level at the Hanoi Hydrological Station from 1.0 m - 1.7 m depending on each release period of the increased release periods.

Article 15. Operation of Hoa Binh, Thac Ba and Tuyen Quang reservoirs in the increased water use period: section 2

Hoa Binh reservoir: based on the water level at the Hanoi Hydrological Station, to operate the reservoir to maintain continuously the water level of not below 2.2 m at the Hanoi Hydrological Station, except for the first day of each release period.

Hoa Binh reservoir: based on the water level at the Hanoi based on the water level at the Hanoi Hydrological Station, to operate the reservoir to maintain the average water level from 1.0 m - 1.7 m at the Hanoi Hydrological Station, except for the first day of each release period.

Supplement to Section 3. During the release serving the period of increased water use, there should be at least one period of release at maximum capacity of the Hoa Binh, Thac Ba and Tuyen Quang hydropower plants.

Article 16. Operation of Hoa Binh, Thac Ba and Tuyen Quang reservoirs during normal water use period: section 3c

During the operation pursuant to the provisions of Point b of this Article, if the average water level of “the day before yesterday” at the Hanoi Hydrological Station exceeds 1.4 m, the reservoir is allowed to proactively reduce the release discharge but must ensure continuous release with a flow rate of not less than 214 m³/s. In case the average water level of “the day before yesterday” at the Hanoi Hydrological Station falls below 1.4 m, the reservoir must operate to release at the discharge specified at Point b of this Article.

During the operation pursuant to the provisions of Point b of this Article, if the average water level “the day before yesterday” at the Hanoi Hydrological Station exceeds 1.1 m, the reservoir is allowed to proactively reduce the release discharge but must ensure continuous release with a flow rate of not less than 214 m³/s. In case the average water level of “the day before yesterday” at the Hanoi Hydrological Station falls below 1.1 m, the reservoir must operate to release at the discharge specified at Point b of this Article.