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I don't know if if is possible to drain the structure and keep it dry ore the size of the leak but probably the best/cheapest solution would a concrete render on the inside. If you have to do it on the outside then you would probably need a mass concrete structure, doubling or more the thickness of the wall, perhaps with some reinforcement depending on the height.

Other alternatives could include installing a heavy duty plastic or butyl rubber lining in the tank.

There is a product Xypex which can be used to seal leaks in concrete and can be placed in the wet. It comes in various forms but details can be found at https://www.xypex.com/. Under their Contacts you can find a form for submitting an enquiry to an agent in Tanzania.

I don't know if if is possible to drain the structure and keep it dry ore or the size of the leak but probably the best/cheapest solution would a concrete render on the inside. If you have to do it on the outside then you would probably need a mass concrete structure, doubling or more the thickness of the wall, perhaps with some reinforcement depending on the height.

Other alternatives could include installing a heavy duty plastic or butyl rubber lining in the tank.

There is a product Xypex which can be used to seal leaks in concrete and can be placed in the wet. It comes in various forms but details can be found at https://www.xypex.com/. Under their Contacts you can find a form for submitting an enquiry to an agent in Tanzania.