8. 5. GENERATING STREAM CHANNEL Based on our flow accumulation, we can map stream channels where the water flows. This channel is based on the number of cells which flow into a specific cell. If we want large channels we use a larger number. For this project we will map all cells that has at least 500 cells that flow into it. Because the cell size is 90 m, these means we are mapping all cells that have a drainage area of at least 90 x 90 x 500 = 4.05 km2. Lrlindu_fla5.tif