The Integrated Rhine Programme (IRP) is a strategic integrated measurement programme of the German federal state of Baden-Württemberg that aims at an improvement of flood control as well as the preservation and/or the restoration of the Upper Rhine plains. The implementation of the IRP shall be supported by an integrated and sustainable Information System for the IRP (IS-IRP) as an extension of the Environmental Information System of Baden-Württemberg. This paper describes how the analysis and design methodology SERVUS is applied to gather and document the functional and informational user requirements for the IS-IRP. SERVUS denotes a Design Methodology for Information Systems based upon Geospatial Service-oriented Architectures and the Modelling of Use Cases and Capabilities as Resources.