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[amitgarg]

Hello everyone,
                         I am preparing a proposal for river bridge whose site condition are as listed below-


     1. This will be a river bridge. The width of river is around 550 metre having water depth varies from 10-22 metre.

     2. There is a dam on downstream side of proposed bridge alignment so generally water in the river is remains at Full Tank Level of the Dam.

     3. Some times the water reduces up to 5-10 metre in the river which is uncertain and fully depends on the amount of water used by dam authority/ rain fall and other which is beyond of over control.

     4. Below 3-5 metre of river bed hard rock is available basically of basalt type hard one.
     
     5. River is flowing in a definite channel.
     So please guide me that in this kind of situation which type of foundation, super structure is suitable from economy, aesthetic and ease in construction point of view.

     What span arrangement is more suitable in this case. Kindly put some light on methodology of working in such a water depth.


     Thanks in advance.