RUNOFF CURVE NUMBER METHOD - ESTIMATION IN ARCGIS PRO - TUTORIAL - HYDROLOGIC SOIL GROUPS AND LULC

🌍💧 What is the Curve Number (CN)?
The Curve Number is a hydrologic parameter developed by the USDA NRCS to estimate 🌧️➡️💦 how much rainfall becomes runoff. It depends on land use, soil type, and hydrologic condition:

🔽 Low CN = more infiltration (forests, sandy soils)
🔼 High CN = more runoff (urban areas, clay soils)

🟤 Hydrologic Soil Groups (HSGs)
Soils are divided into 4 groups based on infiltration capacity:
🅰️ Group A: High infiltration (sand, gravel)
🅱️ Group B: Moderate infiltration (sandy loam)
🅲 Group C: Low infiltration (clay loam)
🅳 Group D: Very low infiltration (clay, shallow water table)

🌳🏙️ Land Use / Land Cover (LULC)
LULC shows the surface type, such as forest, agriculture, grassland, or urban areas. It strongly influences whether rain is absorbed or runs off.

🗂️ How to Create a Curve Number Shapefile
1️⃣ Overlay your Hydrologic Soil Groups (HSG) map with the Land Use Land Cover (LULC) map in GIS.
2️⃣ Each polygon gets assigned both a soil group + land use type.
3️⃣ Use the official NRCS CN tables 📑 to find the correct CN value for each combination.
4️⃣ Save the result as a Curve Number shapefile for hydrologic modeling and watershed analysis.

✨ This process lets you build a spatially accurate CN layer, reflecting both soil infiltration capacity 🟤 and land cover characteristics 🌳🏙️. Perfect for hydrology studies, watershed management, and flood modeling! 🚀

🔗 Full Video:    • FLOOD RISK MAPPING USING GIS AND MULTI-CRI...  

🔗 Link to article: https://www.mdpi.com/2076-3263/8/8/275
Rincón, D.; Khan, U.T.; Armenakis, C. Flood Risk Mapping Using GIS and Multi-Criteria Analysis: A Greater Toronto Area Case Study. Geosciences 2018, 8, 275. https://doi.org/10.3390/geosciences80...

🔗 Used Data: https://drive.google.com/drive/folder...

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