In this paper we present design and development of the semantic grid services for the flood forecasting simulations. We will highlight the corresponding architecture and the process of service annotation, discovery and composition in the project K-WfGrid [12]. We will describe in detail the challenges of the flood-forecasting application and corresponding design and development of the service oriented model, which is based on the well known Web Service Resource Framework (WSRF). Semantic descriptions of the WSRF services will be presented as well as the architecture, which exploits semantics in discovery and composition of services. Further, we will demonstrate how experience management solutions can help in the process of discovery and composition. The system provides a unique approach in Semantic Grids by combining the advances of semantic web services and grid architectures.