����ij�ȵ糧���ҳ�ģ�⽵ˮ 30 mm��50 mm��100 mm �� 150 mm ���������ݣ�����ͳ�Ʒ���������ͬ��ˮǿ���·�ú�����Ž�ˮ��͸�����µ���ȣ���ȷ�����ֽ�ˮ���������ҳ�����Һ�Ƿ��ܹ��ﵽ��ˮ�㣬��ɵ���ˮ��Ⱦ����������ͼֱ���˽ⲻͬ��ˮ���º�ˮ�����������Ա仯��������ȣ���һ��ʹ���Ⱥͼ��鷽�������ñ���ֵ�뽵ˮӰ�����������������ˮ����ֵ���бȽϷ���������������� 0. 1 ������ˮƽ�£���ȾҺ���ܴﵽ��ˮ�㡣

In order to make sure whether ash seepage liquid under different precipitation can reach aquiclude and pollute groundwater��based on the test data under simulated precipitation of 30mm��50mm��100mm and 150mm of an ash disposal area in a thermal power plant��we applied statistical methods to analyze the pollution depth of dry ash under different precipitation�� Firstly��the soil thickness of significant change of soil water content can be learned under different precipitation by boxplot�� Moreover��the method of rank sum test is applied to com- pare the difference between background numerical value and soil water content under different precipitation�� The results imply that polluted liquid can not immerge in groundwater on the significant level of 0. 1��