The barrage will be located at 7km from the Tarbela Dam. The following
figure shows the basic construction.Mian Mobeen Shaukat, student mechanical engineering, Ghulam Ishaque Khan Institute of Engineering Sciences and Technology
The Ghazi Barotha project has basically three different technical sites :
Barrage
Power Channel
Power complex
The whole project uses the fact that there is a difference of altitude between Ghazi and Barotha. This difference in altitude will be used to accelerate the water and this acceleration is utilized in producing power.
The barrage will be located at 7km from the Tarbela Dam. The following
figure shows the basic construction.
Just before the village Ghazi the barrage pond woll be constructed. The functions of the barrage are :
There will be a seperating island on which the control house will be constructed. Near the right bank thee will be 20 standard bays which will be used in regulating the water in the Indus. On the left bank there is a head regulator which will control the inflow into the channel. The good thing about the diversion is that the water required will be supplied through the year without any interruption. You can see a separating dyke which will be 1km long. The main purpose of the dyke is to save the village Ghazi from soil errosion.
The diverted water from the barrage will go into the channel. The main
purpose of the power channel is to carry water from Ghazi to Barotha with minimum losse in
water. The dimensions of the channel are shown in the following figure.
It will be 9m deep and 58.4m wide. It will have on both sides 10m service road and 25 bridges will connect them. The spoil banks on either sides will be made from the soil extracted from the channel and will guard against some rise in water level. An interesting construction will be an under drainage which will stop under seeping of the water into the soil and thus saving valuable water. If by chance there is any seepage there will be another gravel layer which will not allow the water to enter the soil. Any water which seeps through the concrete lining will be collected in the sumps. Pumps will then carry this water back into the channel. Another benefit which will be derived from the channel is that water form any water logged area near the channel will enter it and hence reduce the water logging.
The power complex is the most important part of the whole construction because Electricity will be produced here. The water from the power channel will enter the forebay. Any excess water in the rainy season will be stored in either the north head pond or the south head pond. The power house will have a pen stalk with 5 tunnels in them and in each tunnel there will be one turbine connected with a generator, having a capacity of 290MW. The speed of the water will be utilized to run the turbines and in turn to produce power. This speed will be acheived from the negative gradient of the channel. A spillway is provided ot remove any undesired water any time. The water after utilization will re-enter the river Indus near Barotha.
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