From the USSD Website:

The 2015 USSD Conference theme is Managing Risk and Uncertainty — Ensuring a Sustainable Future for Dams, Levees and Reservoirs. With growth in population and development, many older dams and levees that were constructed to protect agricultural interests are now protecting people and personal property, and are being called upon to provide other benefits such as power generation, recreation and water supply. As a result, the risk associated with many of these structures has increased, bringing new costly challenges for owners to retrofit or modify existing dams and levees in response to the expanded role these structures now play.

The theme for this 35th Annual Conference highlights that, while dams and levees are critical components of the nation's infrastructure, there are always risks and uncertainties associated with ownership and operation of these facilities. Recognizing and effectively managing these risks and uncertainties is critical to ensuring that these structures will continue to provide the societal benefits that we depend on without posing an unacceptable hazard to life, property or the environment.

Stop by the Campbell Scientific booth, #35.