Wright's initial report concluded that drainage would not be difficult. Building canals would be more cost effective than constructing a dike around Lake Okeechobee. The soil would be fertile after drainage, the climate would not be adversely affected, and the enormous lake would be able to irrigate farmland in the dry season.[1] Wright based his conclusions on 15 years of weather data since the recording of precipitation began in the 1890s. His calculations concentrated on the towns of Jupiter and Kissimmee. Since weather data had not been recorded for any area within the Everglades, none was included in the report. Furthermore, the heaviest year of rain on record, Wright assumed, was atypical, and he urged that canals should not be constructed to bear that amount of water due to the expense. Wright's calculations for what canals should be able to hold were off by 55 percent.[32] His most fundamental mistake, however, was designing the canals for a maximum rainfall of 4 inches (10 cm) of water a day, based on flawed data for July and August rainfall, despite available data that indicated torrential downpours of 10 inches (25 cm) and 12 inches (30 cm) had occurred in 24-hour periods.[1]