actually i want to delineate a watershed for my manipulated DEM, i have given the elevation like that water will accumulate at a point. when i am using the mask for its boundary, then its ok... i have used the threshold method of network delineation then it shows the stream network in 2nd step of AWD. but stream doesn't touch the boundary. when i shift the vector vertice of the mask and again run the AWD then the stream shifts backward (doesn't touch boundary). then if i draw the outlet then it gives the error message that the outlet is not defined.
sir please sort out this problem.