Basic Hydrology QGIS Edition

***2025 Update - NRCS has created a tool to download data from Web Soil survey and convert it to a format that QGIS can understand (Geopackage). See this video from NRCS:    • How to Use SSURGO Portal Beta   Soil and water district technicians will learn how to model small watersheds for conservation and stormwater management structures. Three hydrological models are presented: EFH2, TR-20/TR-55, and the rational method. A blend of GIS and by-hand analysis methods are shown. EFH2 software is presented for rural problems while HydroCAD is used for urban projects. The course culminates in a design example to allow students to implement what they've learned. Link to Course Materials: https://apps.agriculture.ny.gov/SoilW... Contents: 00:00 – Introduction 12:14 – Drainage Area Mapping 18:33 – Drainage Areas in QGIS 22:38 – Getting Lidar in New York State 26:40 – Lidar Contours in QGIS 30:16 – Curve Numbers (CN Values) 36:47 – Hydrologic Soil Groups in QGIS 51:43 – Curve Number Mapping in QGIS 1:03:46 – Time of Concentration (Rural) 1:08:39 – Rural Tc in QGIS 1:16:48 – Time of Concentration (Urban) 1:25:38 – EFH2 1:33:43 – HydroCAD 1:45:52 – HydroCAD using the Rational Method 1:53:14 – Rural Design Problem in ArcMap Course Developed by Tim Clark, PE. Check out the Conservation Wiki: https://apps.agriculture.ny.gov/SoilW...