1. Elevation Hydrology Tools A streamlined and Simplified Approach Kent Pea State GIS Coordinator Adolfo Daz MLRA GIS Specialist *special thanks to Peter Mead MN NRCS, he started it all!

2. The Nuts & Bolts The tools are just a toolboxno install Leverage the use of clipping to an AOI to reduce data size Streamline the creation of flow direction, accumulation and stream network derivatives Watershed delineation and associated attributes, area, average slope, runoff curve number etc. Creation of pool storage layers Overview of various unique python scripting solutions that were used 3. So, what is a Runoff Curve Number? The runoff curve number (also called a curve number or simply CN) is an empirical parameter used in hydrology for predicting direct runoff or infiltration from rainfall excess. It is widely used and is an efficient method for determining the approximate amount of direct runoff from a rainfall event in a particular area. Runoff Curve Numbers are calculated based on land cover and hydrologic soil group.