WMS: Advanced Watershed Delineation

Introduction

This tutorial provides a step-by-step guide on how to use the Watershed Modeling System (WMS) for advanced watershed delineation. You will learn how to adjust watershed boundaries to incorporate features like embankments and depressions, enhancing the accuracy of your watershed models. This process is essential for effective water resource management and environmental assessments.

Step 1: Load Your Base Map

• Open WMS and create a new project.
• Import your base map by selecting File > Import > Map Data.
• Choose the appropriate file format (like shapefile or raster) for your geographic data.

Step 2: Define Initial Watershed Boundary

• Use the Watershed Delineation Tool from the toolbar.
• Click on the starting point of your watershed on the map.
• Outline the watershed by clicking around the area to create a polygon.
• Ensure the initial boundary captures the main water flow direction.

Step 3: Adjust Watershed Boundaries for Features

• Identify features such as embankments and depressions on your map.

To modify the watershed boundary

• Select the Edit Boundary Tool.
• Click on the boundary line you want to adjust.
• Drag the vertices to include or exclude features as necessary.
• Check your adjustments by using the Preview option to visualize the changes.

Step 4: Incorporate Elevation Data

• Import elevation data if available. Go to File > Import > Elevation Data.
• Make sure the elevation data aligns with your base map.
• Use the Terrain Analysis tool to analyze how elevation affects water flow in your watershed.

Step 5: Verify and Finalize the Watershed Model

• Review your watershed boundary and features to ensure accuracy.
• Use the Flow Direction Tool to simulate water flow and confirm that it follows the intended paths.
• Save your project by navigating to File > Save to prevent data loss.

Conclusion

You have successfully delineated a watershed using the Watershed Modeling System. By adjusting boundaries to include significant features and incorporating elevation data, you enhance the precision of your watershed models. Next, consider exploring further analysis options within WMS to optimize water resource management strategies.