HEC-HMS for HEC-RAS Users Part 1 of 4: Rainfall runoff routing vs rain on grid

To mark yesterday’s release of the highly anticipated HEC-HMS Version 4.9, we’ve put together some video tutorials showing how easy it is to use HEC-HMS to delineate catchments/watersheds and flow paths, which can be very useful in HEC-RAS models. Part 1: Introductory comparison of rainfall runoff routing (HMS) and rain-on-grid (RAS) modelling approaches 0:00 Introduction 0:48 HEC Program Background 2:56 Hydrology vs. Hydraulics 4:18 Rainfall-runoff model representations 4:50 Rain on grid model representations 6:37 Overview of Parts 2, 3, and 4 Part 2: Delineating watershed boundaries and flow paths in HEC-HMS Part 3: Using boundary and flow path shape files in HEC-RAS rain-on-grid models Part 4: Setting up a basic HEC-HMS model and comparing to HEC-RAS, manual delineations in RAS Mapper using GIS commands Here are some of the links we reference in the videos along with some additio