Step 1: Use the map or the search tool to identify an area of interest. At zoom level 8 or greater State/Region selection will be enabled.

Step 2: You have zoomed in sufficiently to select a state or regional study area. Your selection will dictate the data used to perform basin delineation and flow statistics calculation.

Step 1: Zoom in to level 15 or greater to enable the delineation tool

Step 2: Click the 'Delineate' or 'Delineate By Line' button to activate the delineation tool

Step 2: Click the 'Delineate' button to activate the delineation tool

Step 3: Use your mouse or finger to click or tap a blue stream cell on the map

Step 3: Use your mouse or finger to click or tap points on the map to create a line. Click last point twice to finish the line. Blue stream cells that intersect the line will be delineated.

Step 4: Wait for delineation process to complete...

Step 5: Your delineation is complete. You can now clear, edit, or download your basin, or choose a state or regional study specific function (if available). Click continue when you are ready.

Step 1: Select a scenario below, or expand the "Basin Characteristics" panel to select specific basin characteristics.

Step 2: click "Continue" to proceed.