undrained; non-drainage
Technical term used in engineering, construction, or soil mechanics to describe conditions where water is not drained away. Often appears in compounds like 非排水条件 (undrained condition) or 非排水せん断 (undrained shear).
We report the test results under undrained conditions.
This ground is in an undrained state.
Compound of 非 (hi, 'non-') and 排水 (haisui, 'drainage').