HEC-HMS Tutorials and Guides Meteorologic Methods in HMS Flow Frequency Simulation Options in HEC-HMS Current: Developing a Parametric Area Reduction Function PDF Download PDF Download page Developing a Parametric Area Reduction Function. Current page Include child pages All pages Developing a Parametric Area Reduction Function Introduction to Parametric Area Reduction in HMS Accessing Data and Setting up Meteorologic Model Populating Depth Area Duration Dialog Running Simulation and Comparing Results ×