The influential factors of calculation error for groundwater table are discussed by using the iteration method to find solution of numerical model in the mine drainage forecast of deep drawdown.

This paper expounds the present situation of discharged water from coal mine,probes into the classification and treatment methods,and illustrates the importance of the reuse of discharged water from coal mine with practical case.

In combination with the Yingbulu engineering,the author studied deeply the influence of drainage plan drainage well pit impervious curtain,drainage ditch drainage well on seepage field.

Drainage well of plastic slabs can transmit wacuum but its result of consolidation is nearly the same with that of drainage well of equivalent diameter.