The seepage volume calculation of foundation pit with drop waterproof curtain is a difficult technical problem due to the leakage. In this paper, the existing methods of the seepage volume calculation are summarized and analyzed. Then an operable and practical method, named method of apparent parameter, is proposed. Then this method is applied to a practical project in Wuhan for the calculation of apparent parameter and seepage volume. In the meantime, the actual sealing effect of the drop waterproof curtain has been evaluated. The calculation results are in accordance with the reality, which shows the method of apparent parameter is practicable to use for foundation pit dewatering design and actual sealing effect evaluate. The method of seepage volume calculation for the project example can be used for reference of the similar engineering projects.

drop waterproof curtain, foundation pit dewatering, seepage volume, method of optimized apparent parameter

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