The grid processor needs three grid layers: pour points, flow accumulation, and flow direction. 0000001381 00000 n endstream endobj 197 0 obj <>/Metadata 19 0 R/Pages 194 0 R/StructTreeRoot 29 0 R/Type/Catalog>> endobj 198 0 obj <>/MediaBox[0 0 612 792]/Parent 194 0 R/Resources<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 199 0 obj <>stream %%EOF endstream endobj 161 0 obj<> endobj 163 0 obj<> endobj 164 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 165 0 obj<> endobj 166 0 obj<> endobj 167 0 obj[/ICCBased 173 0 R] endobj 168 0 obj<> endobj 169 0 obj<> endobj 170 0 obj<>stream Coordinate System Following a brief introduction to the SWAT model, AVSWAT and its illustrative application to the Upper North Bosque river watershed, which used some of the most common GIS data delivered by U.S. governmental agencies, will be discussed. Trace the watercourse from its source to its mouth, including all tributaries. a watershed that is draining to an outlet. The only difference is to substitute a point raster for a stream link raster. Big River Watershed. 0000004744 00000 n Delineation Steps There are two basic steps to follow in watershed delineation. A watershed is the upslope area that contributes flow—generally water—to a common outlet as concentrated drainage. • Delineation is part of the process known as watershed segmentation, i.e., dividing the watershed into discrete land and channel Our first step it to determine the direction of flow for each cell in our dataset. 0 For the purpose of a Phase 1 and Phase 2 Assessment, river corridors are defined using the following 4 step process: Step 1. Many of these tools are not activated until other requirements are met; often this requirement is to have used other tools in this menu. 1.1 Adding the … 0000002601 00000 n The last step in watershed delineation is to perform the function itself. This paper presents the methodology that p re-processes the DEM in order to facilitate interactiv e watershed delineation. a watershed that is draining to an outlet. B����΁6�MW��9|w���W8;�F�1���0�`8���d � ��~O�� F _`|��0���|X�פ߻f�)�4����kV�tޢ��q��!�w���R�C���e�)l#�5[vb��6�N߸�1ڕ�r�vd�mc. The first step in doing any kind of hydrologic modeling involves delineating streams and watersheds, and getting some basic watershed properties such as area, slope, flow length, stream network density, etc. Hydrologic Terrain Analysis 3. This study was completed in October 2007 using primarily 2002 FBS data and represents the most recent delineation of watersheds. For watershed delineation functions, the menu serves as a roadmap: the workflow proceeds from top to bottom in order. Watershed and Stream Network Delineation GIS in Water Resources, Fall 2012 Prepared by David Tarboton, Utah State University Purpose The purpose of this exercise is to illustrate watershed and stream network delineation based on digital elevation models using the Hydrology tools in the ArcGIS Geoprocessing toolbox. STEP 10: Distribute copies of your watershed map to your group. startxref Delineation of watersheds can take place at different spatial scales. Catchment Polygon Processing 9. STEP 10: Distribute copies of your watershed map to your group. Although these points are snapped to the stream, it is a good idea to use the Snap Pour Point function to create a grid of snapped points, and then use this grid to Create a working Watershed analysis refers to the process of using DEMs and raster data operations to delineate watersheds and to derive topographic features such as stream networks. Catchment Grid Delineation 8. Step 1: Choose the point of the watershed outlet. Here are the contour lines placed atop the watersheds. h�b```�� Ad`��0p,R�S\����� ���Px� ���§�pc�r��C�* ``�� �`L ۰�AM�m��&�e3�?�m`�ٛ7��. zDelineation of watersheds can also be area-based or point-based. 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. This step identifies the general beginning and ending boundaries. A large watershed may cover an entire stream system and, within the watershed, there may be smaller watersheds, one for each tributary in the stream system. The methods that was followed to delineate watershed of RiverShimsha is depicted in Figure 1. Coordinate System For watershed delineation functions, the menu serves as a roadmap: the workflow proceeds from top to bottom in order. Delineation of Watersheds zDelineation of watersheds can take place at different spatial scales. Step 1: Choose the point of the watershed outlet. Point Based Watersheds. 0000002343 00000 n 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. If you are delineating watersheds, you need to identify pour points (locations for which you want to know the contributing watershed). Big River Watershed. 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