121255
At that time , the spillway gates were opened to 9 " ft. The maximum height is 28 " ft and with nine 9 gates open , the discharge rate is over 190,000 " ft per second , which is equivalent to the flow over Niagara Falls .
 Niagara Falls
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Niagara Falls