After calculating the above items, amount of these items are multiplied by their approved rates to complete the estimate.

Excavation

Excavation of underground water tank is usually done for whole the tank according to design, while the excavation of elevated tanks is used to be done only for foundation. These foundations can be raft or spread.

Concrete work

In foundation of water tank, lean concrete is usually used.1:3:6 is most common ratio in use for water tank

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