 If you want to define the outlet of your catchment, then you need to take care that that outlet has to be on the delineated stream. So in this case, the blue line is the delineated stream that corresponds with the filled DEM, which is your model. In reality, however, you want to measure the discharge maybe under this bridge, because the river is here in this valley. And this is a bridge, and here it ends up in La Galave, the larger river. So let's assume we want the outlet here under the bridge. Then we should not take the coordinate by clicking right here at the bridge, because that doesn't correspond with your model. You need to zoom in to the line, click right, and choose Copy Coordinate. Zooming in is needed, because you need to be within the pixel of the DEM, which in this case is within 5 meters. And then you can choose between two types of coordinates, and you need to choose the one of the layer, which is the same as the project and the DEM. And that's this first coordinate. Once you have copied that coordinate in the Processing Toolbox, you can use that in the upslope area to delineate the catchment. By simply pasting the coordinates here, make sure you have the X and the Y in the correct one, and you choose here the filled DEM, etc. Sometimes, however, you receive a file with the outlet. So I'm going to simulate that. I'm going to create here a temporary scratch layer. I call this Outlet, Point Data Type, and in this case I make it in the... Well, let's make it another projection. Let's assume I get it in Latitude Longitude Coordinates, and it has one attribute, an ID. Editing is toggled on, so I can add a point here, and I put it here on the bridge. And that is our outlet. Now, there are two problems with this file. It is in the wrong projection, and it needs to be snapped to the line. So we can change the projection by clicking right, choosing Export, Save Features As, and you can save it to your Geo Package, or to a Shapefile, whatever. Let me save it here to the Fieldwork Database, and I call this Outlet, and I change it to the correct projection, and there it is. I remove the other one. You don't need that. So now this purple point here is the outlet, but it needs to be snapped to this line. You can, of course, do that manually, but there is also this Tool Snap Geometries to Layer. And there we have our input layer, which is the points. And then we have our channels as the reference layer to be snapped to. And we can then give a Tolerance, which is in the Map Unit in meters here. And let's say that it needs to snap there within 100 meters. And there are here different behavior settings. So you can align it, or the closest point. And in this case, I prefer the closest point on the line, and insert extra vertices where required. So it really goes to the closest point. And then I'm going to save that also to the Geo Package. And I call this one Snaped Outlet. I run it. And apparently this point was the closest, so now it is here. Now I want to add the coordinates to the attribute table. And there is a tool for that. Add X, Y Fields to Layer. And you can choose here the projection that you want to add. And it creates a copy. I run it, open the attribute table, and here I get the X and the Y coordinate of the snapped outlet. If you click this button, you can dock the attribute table. So we have it here. And then we can use the upslope area tool. And you can simply do Ctrl C, Ctrl V to copy the coordinate. Change this to the filled VEM. And then we can use that to delineate the catchment. Sometimes, however, you get the coordinates. It just has numbers. There's a plugin, which is called Lotlon Tools. Here we have the tools. And you see that this is not activated yet. So we need to create a new layer. Let's call it Outlet from Coordinates. And I have it in latitude, longitude coordinates. Now you see this is activated. I'm just going to simulate this. I have the coordinates in latitude, longitude. So I'm going to copy that. And so we assume, of course, that you have received that from somebody or from a GPS. So we go to Lotlon Digitize. And here you can enter the coordinate. Latitude, longitude. Or if you want to change that, then you need to change the order here. In our case, this is longitude, latitude. So we need to change this to longitude, latitude. You can also change to other datans that are used. And do add feature. Give the ID number here. And here you see the point is placed. Let me switch off the other points. Save this. Now we have our point. We need to re-project it. And then we can snap it. Now it's snapped there. And then we can repeat the steps to add the coordinates and use that for the delineation. In the same way as we did with the other methods that were explained in this video.