GIS Tutorial for Watershed Delineation CEE 577, Spring 2013 Liz Isenstein Objective: Learn how to delineate a watershed for a point of interest using a digital elevation model (DEM) and the ArcGIS Spatial Analyst Extension Background: A digital elevation model (DEM) is a regularly spaced grid of numbers representing elevation – Delineating the Watershed from DEMs 5. • In the toolbox, navigate to Conversion Tools → From Raster → Raster to Polygon • Choose sl_watersheds as the input raster. sewer, or combined systems involves delineating catchments and overland flow paths. The processing will include: 1. 9. Watershed Result Step 10 – Create watersheds (Shapefile) Now that you have your watershed delineated in raster format, you can convert this to a shapefile with the basins as individual polygons. Procedure Abstract. For watershed delineation functions, the menu serves as a roadmap: the workflow proceeds from top to bottom in order. A watershed is an upslope area that contributes water flow as concentrated drainage. Downloading and Importing Gauge station location (Point Data) 2. If you are using this tutorial as a guide for another datasets or watershed, make sure that your DEM covers larger area than just the watershed boundary. Various GIS tools are available under the GIS menu (Figure 1). Watershed management field manual Watershed survey and planning. Introduction. It is the lowest point along the boundary of a watershed. 1. List of Examples. Visualizing the landscape represented by the topographic map will make the process much easier than simply Watersheds can be delineated from a DEM by computing the flow direction and using it in the Watershed tool. Introduction and concepts. The last function to run is Watershed Grid to Shapefile. How To: Create a watershed model using the Hydrology toolset Summary. Downloading the DEM and NHD data from ESRI Online Sources 3. Delineating watersheds. The grid processor needs three grid layers: pour points, flow accumulation, and flow direction. 1.1 The need for watershed survey and planning. In this workflow the parameter has been set (not shown) to mark a single watershed. The last step in watershed delineation is to perform the function itself. Here are the contour lines placed atop the watersheds. Delineating a Watershed The following procedure and example will help you locate and connect all of the high points around a watershed on a topographic map shown in Figure F-4 below. Start with a “lakeshed”; the land area contributing (draining) to a lake. Delineating Exercise 1. Do not use a DEM that is clipped exactly to the watershed … We will also delineate the watershed using online delineating tools. The Stream Reach and Watershed function also has the option to delineate subwatersheds draining to each stream reach. Extracting the DEM data 4. The outlet, or pour point, is the point on the surface at which water flows out of an area. outputs a vector stream network shapefile and grid representing the watershed as a whole. using DEM and spatial analyst tools in ArcGIS. This area can be delineated from a digital elevation model (DEM) using the Hydrology toolset from the Spatial Analyst toolbox. Watershed components. Definition (GIS): A watershed is the set of al pixels whose downstream flowpath passes through a selected (outlet) pixel. 55 Watersheds in GIS Definition (Hydrologic): A watershed is a contiguous region of land that all drains to a single location called the watershed outlet. In the recent year’s advances in terrain data collection techniques, most notable Light Detection and Ranging (LiDAR), computing power, and geographical information systems (GIS… Foreword. delineating watersheds by using any pre-processing tool. 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