The problem of detecting gravitational radiation is receiving considerable attention with the construction of new detectors in the United States, Europe, and Japan. The theoretical modeling of the wave forms that would be produced in particular systems will expedite the search for and analysis of detected signals. The characteristic formulation of GR is implemented to obtain an algorithm capable of evolving black holes in 3D asymptotically flat spacetimes. Using compactification techniques, future null infinity is included in the evolved region, which enables the unambiguous calculation of the radiation produced by some compact source. A module to calculate the waveforms is constructed and included in the evolution algorithm. This code is shown to be second-order convergent and to handle highly non-linear spacetimes. In particular, we have shown that the code can handle spacetimes whose radiation is equivalent to a galaxy converting its whole mass into gravitational radiation in one second. We further use the characteristic formulation to treat the region close to the singularity in black hole spacetimes. The code carefully excises a region surrounding the singularity and accurately evolves generic black hole spacetimes with apparently unlimited stability.
Resilience is a strong emerging theme within the water sector. From long term water resource availability and water quality impacts of droughts, to the need for resilience against short lead time disruptive events such as floods and earthquakes. These types of events not only disrupt water sector infrastructure and operations, they also affect other infrastructure that a reliable water sector depends on. This includes electrical power supplies, telecommunications, and transportation as well as disruption to the supply chain and workforce. The impact of such events can be long lasting and far-reaching, affecting negatively on customers, the environment, and business performance. Ultimately, resilience is a significant business risk management as well as an infrastructure planning issue. This joint conference will explore ways in which the sector in its broadest terms is developing resilient systems, assets, and operations so that business continuity risk is well managed in the face of adverse conditions. The intention is to share experience from across the world covering: real life examples of lessons learned from major events; good response and recovery practices; and current activities that are strengthening resilience.