Flood Modeller

Purpose:	Model hydrodynamics in 1D and 2D
Developer:	CH2M Hill
Key Features:	1D and 2D hydrodynamic calculations; Open MI complaint; Limited number of cross sections and nodes
Latest Release:	Version 3.7.1, November 2013
OS Platform:	Windows, UNIX
Cost:	Free, rental, perpetual license
Related Software:	HEC-RAS, InfoWorks RS, MIKE11, SOBEK
Website:	Flood Modeller home page

Introduction

Flood Modeller, formerly known as ISIS, is an integrated 1D and 2D hydrodynamic model that simulates flow and water depth in rivers, estuaries, and urban areas. Flow direction (one-way or multi-directional) and rate (gradual rise and fall as in a flood, or rapid flow variation as in a dam breach) informs the use of 1D and/or 2D modeling. 1D modeling uses the Saint Venant equation for hydrodynamic modeling while 2D models employ the shallow wave equation Flood Modeller applications include estimating water surface elevation in a river, designing hydraulic structures, dam breach analysis, sediment transport, and water quality analysis.

Key features of the Flood Modeller includes Graphical User Interface (GUI), a 2D solver that performs calculations up to 1,000 times faster than a traditional solver, the ability to compute a hydrograph that can then be entered into the model, and a mapping program that can import geospatial data and visualize results. The 'Free' and 'perpetual license ' models differ in their functional abilities.

Advantages and Limitations

Advantages	Limitations
Flood mapping, monitoring and forecasting OpenMI compliant, allows linking with other compliant modeling tools (e.g., SWAT) Ability to link with third party software tools, e.g., TUFLOW, SWMM Training is available via the company Spatial mapping program is used in the development of the model and to visualize results Water quality and sediment transport modeling	Free version of the software is limited by the number of nodes. Channel slopes for 1D cannot be greater than 10 percent Detailed user and technical manual is not provided outside of the help file
Illustrative Screens

Sample Applications

Africa	East Asia and the Pacific	Europe & Central Asia	Latin America & the Caribbean	Middle East and North Africa	South Asia
	Surface water flooding, Philippines 1D hydraulic and salinity models, Mekong River basin	Flood mapping, Romania	Hydrodynamic processes on the flood plains, Argentina