This module allows users to explore the flood forecasting process by assuming the role of a visiting hydrologist intern at the National Hydrologic Service in Main Country. Fictional senior hydrologists guide the intern through an idealized flooding event that takes place over Main Country's Mainstem river basin and its tributary basins, each with varying landscapes and observation systems. Users will examine how these variations impact the quality and type of forecast that can be achieved. Users will also learn about common problems encountered in flood forecasting, and how to adjust forecasts accordingly. This module is intended for a diverse audience that uses a variety of observing and computing technologies, and builds upon material covered in the foundation topics of the International Basic Hydrologic Sciences Course. These core foundation topics are recommended as a prerequisite since this module assumes some pre-existing knowledge of hydrologic principles.