David Koch, New York City’s wealthiest resident and executive vice president of Koch Industries, Inc., has given $100 million to NewYork-Presbyterian Hospital, the largest single donation in the hospital’s history.

NewYork-Presbyterian was one of several New York City hospitals affected by Superstorm Sandy last October. As NYU’s Langone Medical Center and Bellevue Hospital flooded and lost power, others, including NewYork-Presbyterian, took in the extra patients. Robert E. Kelly, president of NewYork-Presbyterian, told Newsday that his doctors saw twice as many trauma patients, 25 percent more emergency-room patients, and an increase in psychiatric patients after Superstorm Sandy -- patients that would normally have been treated at downtown hospitals. So many NewYork-Presbyterian workers faced their own Sandy-related hardships that the hospital formed an employee relief fund.

Koch’s $100 million must have seemed like salvation for the hospital’s strained resources.