Accra has been experiencing periodic flooding that affect properties and lives. The government seeing the dangers involved, commissioned institutions such as Ministry of Works and Housing, Town and Country Planning and City Engineers to identify such areas and adapt measures that will help reduce the effect of the periodic event. These institutions identify flood risk zones using conventional m...

Geographic Information Systems (GIS) are an efficient and interactive spatial decision support tool for flood risk analysis. This paper describes the development of ArcView GIS extension — namely AVHEC-6.avx — to integrate the HEC-6 hydraulic model within GIS environment. The extension was written in an Avenue Script language and Dialog Designer with a series of ‘point and click’ options. It ha...

Synthetic design storms are often used to plan new drainage systems or assess flood impacts on infrastructure. To simulate extreme rainfall events under climate change, can be modified match a different return frequency of as well temporal distribution intensities. However, the same magnitude change intensities is applied in space. Several hydrological applications limited by this. Climate urba...

This paper presents an approach to enhance the role of local stakeholders in dealing with urban floods. The concept is based on the DIANE-CM project (Decentralised Integrated Analysis and Enhancement of Awareness through Collaborative Modelling and Management of Flood Risk) of the 2nd ERANET CRUE funding initiative. The main objective of the project was to develop and test an advanced methodolo...

Most former soft shadow algorithms have either suffered from restricted self-shadowing capabilities, been too slow for interactive applications, or could only be used with a limited types of geometry. In this paper, we propose an efficient image-based approach for computing soft shadows. Our method is based on shadow mapping and provides the associated benefits. We use pixel-based visibility co...

Probabilistic methods are widely adopted for residual flood hazard assessment in flood-prone areas protected by levees. Such can consider various sources of uncertainty, including breach location and event characteristics, allow the quantification result confidence. However, possible occurrence multiple levee breaches during same is usually disregarded. This paper presents a probabilistic metho...