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Swimming Pool & Spa Construction & Maintenance/Leak arresting underground RCC structure with high water table

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Question
I am building a bio methanisation plant here in kerala. The digester is of Dheenabandhu model...i.e almost a sphere shape. The half of the same (hemisphere) is under ground and the rest is above ground.

The underground part is built by 100mm RCC over 100mm PCC. But unfortunately since the water table is high (almost ground level) during construction itself water percolated into the underground hemisphere structure.We tried to close every entry but the water kept penetrating inside.If one entry is closed it will make another opening.

Now, the concrete is set and still ground water is percolating inside the RCC structure.

Please suggest a good method to arrest the leakages of the porous underground RCC structure, where the watertable around is quite high(almost upto ground level)

Best regards,
Geoffrey.
Kerala, India.

Answer
First lets be clear that any waterbody would have to be atleast 8 inches Raft i.e. top and bottom reinforcement. Unless begin design by a Certified Structural Consultants/ Engineer.
I can only suggest that you have to redo the concrete by taking design from a Structural Engineer.
Since the load of underground has to be withstand by structure itself, and remember once the water table lower the water from the tank would percolate to the ground. Secondly if it not designed for empty condition it can cave in.  

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Manish J.Joshi

Expertise

Planning, Design, execution, Installation, maintaining, FINA/SPATA/ISPE standards,Trouble shooting in water, Design of filters,U.V, Rain water harvesting, waterparks, themeparks, amusement parks, playground equipments, water slides and spas, Tiling, waterproofing, Feasibility studies

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Last fifteen (15)years water industry Especially waterparks, wavepools, swimming pools, spas,

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H2O The water Specialist website:- waterparks.in

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B.E. major in Construction Engg. M.B.A. Finance

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JVPD club India, MCF club India, HFIL in India

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