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Repair of spring protection scheme

I'm writing on behalf of a small NGO that has a problem with a spring protection scheme in Tanzania. A leak has emerged in the lower front corner of the structure resulting in the water level dropping below the output pipe. Are there any guidelines/tips for cheap repair materials and reinforcement? Also whether to repair on the outside or inside of the structure. Many thanks in advance for your thoughts.

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I don't know if if is possible to drain the structure and keep it dry 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 http://www.xypex.com/. Under their Contacts you can find a form for submitting an enquiry to an agent in Tanzania.

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