What list can be included in the open trench for foundation pit drainage?

Construction drainage and precipitation should be determined according to the required precipitation range, groundwater depth and construction method, depending on whether to adopt open drainage of foundation pit or well point precipitation. The open drainage of foundation pit shall be subject to the earthwork quantity of the drainage ditch to be dug, and the quota of trenching and backfilling shall be implemented; Well point dewatering should be calculated according to the spacing, pipe diameter and depth adopted by dewatering method. Take the civil engineering quota as "meter" and the municipal quota as "root", and take the corresponding quota. The first volume of civil quota set 12, and the sixth chapter of the first volume of municipal quota set.