How to guess seepage line in a slope

Question

Hi, 
 I have to do seepage analysis in a mine waste dump slope, where I have no data of seepage flow. I have only ground water level data not any other water level data. 
 So, how can draw the seepage line or in PLAXIS 2D there is any way to assume the seepage line? 
 Also how can I do sensitivity analysis for evaluating seepage level? 
 I am beginner in Plaxis that's why can't understand. 
 Thank you.

Dennis Waterman · Answer

Dear Nadia, 
 In Flow conditions mode there is a button "Create water level" ( ) with which you can draw your own water level wherever you like. The built-in sensitivity analysis tool in PLAXIS only works for changes in material parameters, not for geometrical changes like changes of water level. Hence, you would have to manually calculate the project a few times with different water levels and see how much difference it makes for the results. 
 With kind regards, 
 Dennis Waterman