The most powerful documentary I've seen at Sundance is Trouble the Water, a take on Hurricane Katrina and its aftermath unlike anything I've seen. Combining footage shot by longtime Michael Moore collaborators Carl Deal and Tia Lessin with amateur video footage shot from the eye of the hurricane by New Orleans resident Kimberly Rivers Roberts (who received director of photography credit) the film shows the impact of Hurricane Katrina and what happened to the city's poorest residents both during and after the storm.

Roberts, who bought a camcorder off the street for $20 a week before the storm hit, intending to use it only to shoot family gatherings, captured the residents of the 9th Ward, one of the hardest-hit areas of New Orleans, as those who could got out and those who couldn't battened down the hatches in preparation for the storm. Roberts and her husband Scott were among those who were unable to evacuate the city because they had no transportation and no money to go anywhere. The mayor of New Orleans ordered the city evacuated, but there was no public transportation organized to get out those people who didn't have the means to do so on their own.