An Inquiry System for Design Discharge in Small and Midsize Watersheds

The paper presents a geomorphic and hydrologic information system for design discharge in small and midsize ungauged watersheds. A compound module, which is based on digital elevation model, frequency analysis theory, kinematic-wave approximation, and geomorphic based runoff modeling can provide enough information for design discharge for different return period conditions. Since the location of future hydraulic work are unpredictable, geomorphic information of any location within the watershed is required. While using the inquiry system, users can interactively select a point only by clicking on mouse at the desired location, and then consequent calculation procedures will be conducted. The system also presents the possibility for users to run several location of subwatershed outlet to consult different aspects for alternative designs.