Utilizing Digital Terrain Model for Watershed Analysis
Analyzing a watershed using a Digital Terrain Model (DTM) to match inlets with their respective outfalls. The project aims to identify pollution sources, create cartographic models, and address challenges like inaccurate results due to surface elevation and lack of curves in sewer pipes.
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Presentation Transcript
Using a Digital Terrain Model to Analyze a Watershed in Order to Match Inlets with their Respective Outfalls Aspen Navarro, Project Manager, GIS Analyst Michael Jones, Assistant Project Manager, GIS Analyst William Perry, Project Designer, GIS Analyst
Outline I. Purpose II. Scope III. Revised Timeline IV. Challenges and Concerns V. Remaining Task VI. Conclusion
Purpose New methodology Watershed analysis using a digital terrain model (DTM) -Identify where inlets fall within the watershed of specified outfall -narrows down where pollution is coming from Create a cartographic model for backup and reference
Inlets and Outfalls in our Project Boundary San Antonio, Texas 0 Author: Aspen Navarro Date: 26 October 2016 Projection: NAD 1983 Source: The City of San Antonio, The San Antonio River Authority 0.4 0.8 1.6 2.4 3.2 Miles Westside Creeks Outfalls Inlets
Revised Timeline Major delays included data processing issues and interoperability Issues, leading to a larger amount of time spent on pre-processing and a lower time spent on analysis. Four major dates; two meetings, a progress report, and a final project on Dec 7th. Week Date 5-Sep 12-Sep 19-Sep 26-Sep 3-Oct 10-Oct 17-Oct 24-Oct 31-Oct 7-Nov 14-Nov 21-Nov 28-Nov 5-Dec Activity Week Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Meeting with client ; research Data collection; manipulation Preprocess data Analysis and integration Edit; finalize Final report Final presentation *Meeting 1 *Meeting 2 *Progress Report *Final *Important dates 7
Remaining Task Task 1: Organize data for analysis and delineate project area Minimize data Use data to delineate Westside Creeks Task 2: Watershed analysis Fill Flow direction Flow accumulation Snap pour point Watershed Task 3: Matching inlets with respective outfalls Identify inlets within each outfall watershed boundary
Watershed Analysis Challenges and Concerns Surface elevation will make results inaccurate Sewer pipes do not have curves Many of the outfalls are close together A digital terrain model (DTM) is required for an accurate watershed analysis Matching ALL inlets to outfalls within the timeline http://www.univ-st-etienne.fr/wikimastersig/doku.php/english:glossary:dtm
http://sandboxdocs.readthedocs.io/en/latest/tutorials/working-with-terrain/http://sandboxdocs.readthedocs.io/en/latest/tutorials/working-with-terrain/
Conclusion Increased accuracy of connecting inlets to outfalls Split up workload to catch up on lost time Moving forward with or without a DTM https://web.viu.ca/corrin/GIS/New_Folder/Export%20Graphic.jpg 12
13 http://launchany.com/wp-content/uploads/2016/01/idea.jpg
