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This is a common question that we get asked a lot. The short answer is yes, we can do it However, it's not always the best solution, durability point of view. A sump tank is a water storage tank that is usually underground. Many times, there may not be enough space in the ground floor to accommodate tanks. The reason is a tight plot where the client wants to build as much possible. When the site is tight, it is difficult to accommodate space for services like water tanks. Then the structural engineers are asked to explore possibilities of accommodating it between footings. Some times this may not be possible if the footings are closer. The next preferred location may be on top of footings.
Waterproofing a sump tank is important. It protects the foundation reinforcement from being corroded.
Another structural point to ensure is the depth of excavation. The water tank base shall not be below footing base. If you do this, then the stability of the building itself might be affected. It can lead to the footing load or surcharge being passed to the side wall of the tank. It is not sensible to design the tank base for this pressure. If it is not designed the side wall of the sump tank can fail or can have severe cracks and leaks. It can even lead to failure of the building.
All these aspects are mentioned in the video clearly with sketches.
As a summary
We can have tanks on top of a footing
The tank shall be water proofed to avoid any leakage that can lead to corrosion of rebars of footings
The level of water tank base shall not be below the footing base as this can lead to instability and collapse and other structural issues.
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