 The effects of the Hoover Dike were seen immediately . An extended drought occurred in the 1930s , and with the wall preventing water leaving Lake Okeechobee and canals and ditches removing other water , the Everglades became <unk> . <unk> turned to dust , and <unk> ocean water entered Miami 's wells . When the city brought in an expert to investigate , he discovered that the water in the Everglades was the area 's groundwater — here , it appeared on the surface . <unk> the Everglades removed this groundwater , which was replaced by ocean water seeping into the area 's wells . In 1939 , 1 million acres ( 4 @,@ 000 km2 ) of Everglades burned , and the black clouds of peat and sawgrass fires hung over Miami . Underground peat fires burned roots of trees and plants without burning the plants in some places . Scientists who took soil samples before draining had not taken into account that the organic composition of peat and muck in the Everglades was mixed with bacteria that added little to the process of decomposition underwater because they were not mixed with oxygen . As soon as the water was drained and oxygen mixed with the soil , the bacteria began to break down the soil . In some places , homes had to be moved on to <unk> and 8 feet ( 2 @.@ 4 m ) of <unk> was lost . 
