Alrrusairis Dam

 

Background:


The Blue Nile and the lands on both banks constitute vast sites for development, especially in the fertile lands lying on both sides where there is a variety and an abundance of natural resources: soil, water, forests, wild life, and minerals. The area ranks high among the various parts of Sudan in the field of wealth and economic and social development as a result of the agricultural projects that still represents the first alternative of future investments in the area.
There are four dams in Sudan, and the fifth one is about to finish. Two of these are on the Blue Nile: Sinnar Dam, and Roseires Dam.
In 1952 the Government of Sudan considered the possibility of constructing a dam near the city of Roseires. In 1955 consulting companies Coyne Bellier and Sir Alexander Gibb and Partners were chosen to study and design the project. The study recommended the construction of a dam with a storage capacity of 3 Billions cubic metre at a water level of 480 m (Phase I)(Irrigation Datum), the storage capacity is to be raised to 7.4 billions m3 with an increase in height of 10 m up to level 490 m (Irrigation Datum) at the second stage of construction (Phase II). In 1959, the Nile Water Agreement signed between Egypt and Sudan dedicated 18.5 billion m3 (measured at Uswan) as the Sudan's share of water. The Agreement allowed for the construction of Roseires Dam and the first stage of construction was started in 1961and completed in 1966.
 

The First Stage:(Phase I)
 

The Site:


Roseires Dam lies on the Blue Nile at Alddamazeen rapids between longitudes 33-35 East, and latitudes 11-12 North, 550 km South East from the capital of Sudan - Khartoum – The Dam Site is 800 km far from the Tana Lake in Ethiopia. The area is linked by an asphalt road and a domestic airport. It used to be linked in the past by railway. Land is characterized by flat terrain with few hillocks and soaring mounts along the borders with Ethiopia.
Blue Nile State lies in the  savanna zone with annual rainfalls of 900-1250 mm. The reservoir is about 290 square km.


The concrete Dam:

The concrete section is a buttress dam of one km long and a maximum height of 68 m. The total volume of concrete is 850,000 m3.

The Earth Dam:

The earth dam constitute 5 million cubic meter of fill having maximum height above foundation of 30 m. The total length is 12.5km as follows:
• 4km on eastern bank
• 8.5km on western bank


Flood Discharge:

Floods are routed through:

·    Gated spillway with 7 radial gates, each 12m high by 10 m wide.

·    Five deep sluices with radial gates, each 10.5 m high by 6 m wide.

 

 

Power Generation Plant:


Roseires Electricity Station:


The Government of Sudan requested Mares and Mclealan Company to present a report on the Potential of Hydro power energy in Sudan. Roseires Electricity Station was one of the major sources in that report, upon which the government signed a contract with the Italian Company of Ambergeilo for making the bases of turbines.
Alddamazeen Power Generation Station consists of seven vertical Kaplan turbines. The Horse power of each is 14.500 working under a water head of 29m high. These seven turbines are directly connected to seven electric generators, the generated power of each is 30 MW, working under a voltage of 11 KV that can be raised to 220 KV by two transformers,  the capacity of each is 67 MVA.

The power generated from 7 units X 40 MW = 280 MW


High-Voltage Line (Roseires Khartoum):
The power generated in Alddamazeen is transmitted to Khartoum by a new high-voltage transmission line linked to Khartoum Sinnar line. This transmission line joins Roseires Power Generation Station with the subsidiary station in Kilo A'shara (483 km). It transmits electricity under a voltage of 220 KV.
The route was decided to pass through the irrigated land for covering electricity shortage in this area. The total number of towers in this line is 1,287. The length of aluminium wires used for transmitting electricity is 1449 km. There is another high-voltage line of 110 KV linking the subsidiary station in Kilo A'shara with Khartoum North. The 220-KV line consists of three main subsidiary stations: Roseires, Marinjan, and Kilo A'shara, and a fourth at the end of 110-KV line in Khartoum North Station.


Central Control:


With the completion of Roseires Power Generation Station and the 220-KV line, the electricity network covering central Sudan would reach a stage where it is necessary to have a control centre to attain an economic harmony in the operation of the systems of generation and high voltage and distribution network, hence the Control Centre in the Head Offices of National Electricity Corporation where there are two groups of meters, plates and the equipment required for contact with all network stations.
The First: this represents all voltage lines, 110/220 KV, which have mechanical indicator for places of circuit breakers, transformers, and meters showing the flow of effective and ineffective power, and voltage levels in major places.
The Second: this represents the subsidiary high-voltage lines, 33 KV, in Khartoum area.

 

 

 

 

 

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