Watershed and Stream Network Delineation GIS in Water Resources, Fall 2014 Prepared by David G Tarboton and David R. Maidment Purpose The purpose of this exercise is to illustrate watershed and stream network delineation based on digital elevation models using the Hydrology tools in ArcGIS and online services for Hydrology and Hydrologic data. to create a stream network from a 1m Lidar-derived raster DEM. I am using the Hydrology tools (Flow Direction; Flow Accumulation etc.) About the Create Stream Network task. C:\arcgis\ArcTutor\GP Service Examples\StreamNet contains the completed model and data. The StreamLink task assigns unique values to sections of a raster linear network between intersections. The input stream raster can be created by thresholding the results of the FlowAccumulation task. The STARS toolset makes use of the Landscape Network, a data structure used to efficiently navigate throughout a stream network. Under “Stream delineation method”: select “DEM curvature based…..” Under “Stream delineation parameters and settings”: Accumulation threshold = 25 These default settings should remain the same: Weight side .1 Weight center .4 Weight diag .05 ; Create Stream Network—The user creates a new network by entering an upstream drainage area.. The basemap service allows you to view five precomputed networks, ranging from 10 to 50 hectares. This is most useful as input to the Watershed tool to quickly create watersheds based on stream junctions. Learning Outcomes 1) Filling sinks in a DEM 2) D8 pour point method for assigning flow direction 3) Meaning and role of stream network critical source area (CSA) threshold 4) Difference between watershed versus sub-watershed in ArcGIS 5) Computing drainage density and stream order of a river network Input Data Stream links. Streaming feature layers created from an ArcGIS Server stream service stream data updates as they occur. The primary purpose of the Create Stream Network task is to produce a stream network for cartographic display. ArcGIS. They are useful for visualizing real-time data feeds that have high volumes of data or that have data that changes at unknown intervals. The algorithm used by the Stream to Feature tool is designed primarily for vectorization of stream networks or any other raster representing a raster linear network for which directionality is known.. This is a … There are two geoprocessing services: Get Precomputed Stream Network—The user chooses a precomputed stream network, and the features are transported back. ArcGIS GeoEvent Server must be licensed and installed in your enterprise GIS in order to leverage stream services. Statisticians have developed sophisticated spatial statistical stream-network models that account for 1) spatial autocorrelation using both Euclidean and in-stream distance, 2) the branching structure of the network, and 3) directional flow. The vectorization algorithm is designed primarily for vectorization of raster stream networks or any other raster representing a raster linear network for which directionality is known. Control stream feature layers. The Stream Link tool allows you to assign unique values to each of the links in a raster linear network. • Select Basic Grid Analysis > Full River Network Raster. Available with Spatial Analyst license. Links are the sections of a stream channel connecting two successive junctions, a junction and the outlet, or a junction and the drainage divide. Two results are illustrated below, using a hillshade of the study area (the town of Stowe, Vermont) as a basemap. In the initial release (10.3), stream service content can be incorporated into ArcGIS Online web maps as well as exposed through clients developed using the ArcGIS API for JavaScript. The tool is optimized to use a direction raster to aid in vectorizing intersecting and adjacent cells. STARS: ArcGIS Toolset. 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