Deltares is a Dutch research institute focused on water management. It has over 850 staff working on developing and applying expert knowledge to sustainable development of deltas, coasts, and rivers. Deltares has been collaborating with USGS to apply its modeling capabilities to coastal systems in the US, including the Columbia River, Puget Sound, and San Francisco Bay. Key areas of collaboration include understanding sediment processes, developing community models to assess climate change impacts, and applying models to inform management of dredging, flooding, and ecosystem restoration.