I want to know the answer to the following question:
After the water purification plant at the Croton Watershed is built, how much more water will be added to the city's supply each day?
All the background I'm provided with is that "The Croton Watershed north of the city is undergoing construction of a US$3.2 billion water purification plant to augment New York City's water supply by an estimated 290 million gallons daily, representing a greater than 20% addition to the city's current availability of water.". Is that enough to answer the question?
Answer: yes