This treaty, designed to ensure an "unbroken curtain of water" is flowing over the falls, states that during daylight time during the tourist season (1 April to 31 October) there must be  of water flowing over the falls, and during the night and off-tourist season there must be  of water flowing over the falls.
This agreement, intended to maintain a "continuous flow of water," stipulates that during daylight hours from April 1st to October 31st (tourist season), there must be a certain amount of water flowing over the falls, and during nighttime and non-tourist periods, there must be another specified amount.