Water flows downhill so the key is to figure out the lay of the land. As well, one needs to recognize that north is straight up on this map (Recall: With a topographic map, get the writing right side up and straight up is north). Also remember that when contour lines intercept a stream, they point upstream. Consequently, an inspection of the contour lines intercepting Timmins Brook shows that they point towards the northeast. Therefore, the water is flowing in the opposite direction towards the southwest (D).